1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
27
28 #include "utilities/debug.hpp"
29
30 // use this for flags that are true per default in the tiered build
31 // but false in non-tiered builds, and vice versa
32 #ifdef TIERED
33 #define trueInTiered true
34 #define falseInTiered false
35 #else
36 #define trueInTiered false
37 #define falseInTiered true
38 #endif
39
40 #ifdef TARGET_ARCH_x86
41 # include "globals_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "globals_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "globals_zero.hpp"
48 #endif
49 #ifdef TARGET_ARCH_arm
50 # include "globals_arm.hpp"
51 #endif
52 #ifdef TARGET_ARCH_ppc
53 # include "globals_ppc.hpp"
54 #endif
55 #ifdef TARGET_ARCH_aarch64
56 # include "globals_aarch64.hpp"
57 #endif
58 #ifdef TARGET_OS_FAMILY_linux
59 # include "globals_linux.hpp"
60 #endif
61 #ifdef TARGET_OS_FAMILY_solaris
62 # include "globals_solaris.hpp"
63 #endif
64 #ifdef TARGET_OS_FAMILY_windows
65 # include "globals_windows.hpp"
66 #endif
67 #ifdef TARGET_OS_FAMILY_aix
68 # include "globals_aix.hpp"
69 #endif
70 #ifdef TARGET_OS_FAMILY_bsd
71 # include "globals_bsd.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_x86
74 # include "globals_linux_x86.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_linux_sparc
77 # include "globals_linux_sparc.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_linux_zero
80 # include "globals_linux_zero.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_solaris_x86
83 # include "globals_solaris_x86.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_solaris_sparc
86 # include "globals_solaris_sparc.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_windows_x86
89 # include "globals_windows_x86.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_linux_arm
92 # include "globals_linux_arm.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_linux_ppc
95 # include "globals_linux_ppc.hpp"
96 #endif
97 #ifdef TARGET_OS_ARCH_linux_aarch64
98 # include "globals_linux_aarch64.hpp"
99 #endif
100 #ifdef TARGET_OS_ARCH_aix_ppc
101 # include "globals_aix_ppc.hpp"
102 #endif
103 #ifdef TARGET_OS_ARCH_bsd_x86
104 # include "globals_bsd_x86.hpp"
105 #endif
106 #ifdef TARGET_OS_ARCH_bsd_zero
107 # include "globals_bsd_zero.hpp"
108 #endif
109 #ifdef COMPILER1
110 #ifdef TARGET_ARCH_x86
111 # include "c1_globals_x86.hpp"
112 #endif
113 #ifdef TARGET_ARCH_sparc
114 # include "c1_globals_sparc.hpp"
115 #endif
116 #ifdef TARGET_ARCH_arm
117 # include "c1_globals_arm.hpp"
118 #endif
119 #ifdef TARGET_ARCH_aarch64
120 # include "c1_globals_aarch64.hpp"
121 #endif
122 #ifdef TARGET_OS_FAMILY_linux
123 # include "c1_globals_linux.hpp"
124 #endif
125 #ifdef TARGET_OS_FAMILY_solaris
126 # include "c1_globals_solaris.hpp"
127 #endif
128 #ifdef TARGET_OS_FAMILY_windows
129 # include "c1_globals_windows.hpp"
130 #endif
131 #ifdef TARGET_OS_FAMILY_aix
132 # include "c1_globals_aix.hpp"
133 #endif
134 #ifdef TARGET_OS_FAMILY_bsd
135 # include "c1_globals_bsd.hpp"
136 #endif
137 #ifdef TARGET_ARCH_ppc
138 # include "c1_globals_ppc.hpp"
139 #endif
140 #endif
141 #ifdef COMPILER2
142 #ifdef TARGET_ARCH_x86
143 # include "c2_globals_x86.hpp"
144 #endif
145 #ifdef TARGET_ARCH_sparc
146 # include "c2_globals_sparc.hpp"
147 #endif
148 #ifdef TARGET_ARCH_arm
149 # include "c2_globals_arm.hpp"
150 #endif
151 #ifdef TARGET_ARCH_ppc
152 # include "c2_globals_ppc.hpp"
153 #endif
154 #ifdef TARGET_ARCH_aarch64
155 # include "c2_globals_aarch64.hpp"
156 #endif
157 #ifdef TARGET_OS_FAMILY_linux
158 # include "c2_globals_linux.hpp"
159 #endif
160 #ifdef TARGET_OS_FAMILY_solaris
161 # include "c2_globals_solaris.hpp"
162 #endif
163 #ifdef TARGET_OS_FAMILY_windows
164 # include "c2_globals_windows.hpp"
165 #endif
166 #ifdef TARGET_OS_FAMILY_aix
167 # include "c2_globals_aix.hpp"
168 #endif
169 #ifdef TARGET_OS_FAMILY_bsd
170 # include "c2_globals_bsd.hpp"
171 #endif
172 #endif
173 #ifdef SHARK
174 #ifdef TARGET_ARCH_zero
175 # include "shark_globals_zero.hpp"
176 #endif
177 #endif
178
179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
180 define_pd_global(bool, BackgroundCompilation, false);
181 define_pd_global(bool, UseTLAB, false);
182 define_pd_global(bool, CICompileOSR, false);
183 define_pd_global(bool, UseTypeProfile, false);
184 define_pd_global(bool, UseOnStackReplacement, false);
185 define_pd_global(bool, InlineIntrinsics, false);
186 define_pd_global(bool, PreferInterpreterNativeStubs, true);
187 define_pd_global(bool, ProfileInterpreter, false);
188 define_pd_global(bool, ProfileTraps, false);
189 define_pd_global(bool, TieredCompilation, false);
190
191 define_pd_global(intx, CompileThreshold, 0);
192
193 define_pd_global(intx, OnStackReplacePercentage, 0);
194 define_pd_global(bool, ResizeTLAB, false);
195 define_pd_global(intx, FreqInlineSize, 0);
196 define_pd_global(size_t, NewSizeThreadIncrease, 4*K);
197 define_pd_global(intx, InlineClassNatives, true);
198 define_pd_global(intx, InlineUnsafeOps, true);
199 define_pd_global(intx, InitialCodeCacheSize, 160*K);
200 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
201 define_pd_global(intx, NonProfiledCodeHeapSize, 0);
202 define_pd_global(intx, ProfiledCodeHeapSize, 0);
203 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M);
204
205 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
206 define_pd_global(intx, CodeCacheMinBlockLength, 1);
207 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
208 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M));
209 define_pd_global(bool, NeverActAsServerClassMachine, true);
210 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
211 #define CI_COMPILER_COUNT 0
212 #else
213
214 #if defined(COMPILER2) || INCLUDE_JVMCI
215 #define CI_COMPILER_COUNT 2
216 #else
217 #define CI_COMPILER_COUNT 1
218 #endif // COMPILER2 || INCLUDE_JVMCI
219
220 #endif // no compilers
221
222 // string type aliases used only in this file
223 typedef const char* ccstr;
224 typedef const char* ccstrlist; // represents string arguments which accumulate
225
226 struct Flag {
227 enum Flags {
228 // value origin
229 DEFAULT = 0,
230 COMMAND_LINE = 1,
231 ENVIRON_VAR = 2,
232 CONFIG_FILE = 3,
233 MANAGEMENT = 4,
234 ERGONOMIC = 5,
235 ATTACH_ON_DEMAND = 6,
236 INTERNAL = 7,
237
238 LAST_VALUE_ORIGIN = INTERNAL,
239 VALUE_ORIGIN_BITS = 4,
240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
241
242 // flag kind
243 KIND_PRODUCT = 1 << 4,
244 KIND_MANAGEABLE = 1 << 5,
245 KIND_DIAGNOSTIC = 1 << 6,
246 KIND_EXPERIMENTAL = 1 << 7,
247 KIND_NOT_PRODUCT = 1 << 8,
248 KIND_DEVELOP = 1 << 9,
249 KIND_PLATFORM_DEPENDENT = 1 << 10,
250 KIND_READ_WRITE = 1 << 11,
251 KIND_C1 = 1 << 12,
252 KIND_C2 = 1 << 13,
253 KIND_ARCH = 1 << 14,
254 KIND_SHARK = 1 << 15,
255 KIND_LP64_PRODUCT = 1 << 16,
256 KIND_COMMERCIAL = 1 << 17,
257 KIND_JVMCI = 1 << 18,
258
259 KIND_MASK = ~VALUE_ORIGIN_MASK
260 };
261
262 enum Error {
263 // no error
264 SUCCESS = 0,
265 // flag name is missing
266 MISSING_NAME,
267 // flag value is missing
268 MISSING_VALUE,
269 // error parsing the textual form of the value
270 WRONG_FORMAT,
271 // flag is not writeable
272 NON_WRITABLE,
273 // flag value is outside of its bounds
274 OUT_OF_BOUNDS,
275 // flag value violates its constraint
276 VIOLATES_CONSTRAINT,
277 // there is no flag with the given name
278 INVALID_FLAG,
279 // other, unspecified error related to setting the flag
280 ERR_OTHER
281 };
282
283 const char* _type;
284 const char* _name;
285 void* _addr;
286 NOT_PRODUCT(const char* _doc;)
287 Flags _flags;
288
289 // points to all Flags static array
290 static Flag* flags;
291
292 // number of flags
293 static size_t numFlags;
294
295 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
296 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
297 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
298
299 void check_writable();
300
301 bool is_bool() const;
302 bool get_bool() const;
303 void set_bool(bool value);
304
305 bool is_int() const;
306 int get_int() const;
307 void set_int(int value);
308
309 bool is_uint() const;
310 uint get_uint() const;
311 void set_uint(uint value);
312
313 bool is_intx() const;
314 intx get_intx() const;
315 void set_intx(intx value);
316
317 bool is_uintx() const;
318 uintx get_uintx() const;
319 void set_uintx(uintx value);
320
321 bool is_uint64_t() const;
322 uint64_t get_uint64_t() const;
323 void set_uint64_t(uint64_t value);
324
325 bool is_size_t() const;
326 size_t get_size_t() const;
327 void set_size_t(size_t value);
328
329 bool is_double() const;
330 double get_double() const;
331 void set_double(double value);
332
333 bool is_ccstr() const;
334 bool ccstr_accumulates() const;
335 ccstr get_ccstr() const;
336 void set_ccstr(ccstr value);
337
338 Flags get_origin();
339 void set_origin(Flags origin);
340
341 bool is_default();
342 bool is_ergonomic();
343 bool is_command_line();
344
345 bool is_product() const;
346 bool is_manageable() const;
347 bool is_diagnostic() const;
348 bool is_experimental() const;
349 bool is_notproduct() const;
350 bool is_develop() const;
351 bool is_read_write() const;
352 bool is_commercial() const;
353
354 bool is_constant_in_binary() const;
355
356 bool is_unlocker() const;
357 bool is_unlocked() const;
358 bool is_writeable() const;
359 bool is_external() const;
360
361 bool is_unlocker_ext() const;
362 bool is_unlocked_ext() const;
363 bool is_writeable_ext() const;
364 bool is_external_ext() const;
365
366 void unlock_diagnostic();
367
368 void get_locked_message(char*, int) const;
369 void get_locked_message_ext(char*, int) const;
370
371 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
372 void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
373 void print_kind(outputStream* st);
374 void print_as_flag(outputStream* st);
375
376 static const char* flag_error_str(Flag::Error error);
377 };
378
379 // debug flags control various aspects of the VM and are global accessible
380
381 // use FlagSetting to temporarily change some debug flag
382 // e.g. FlagSetting fs(DebugThisAndThat, true);
383 // restored to previous value upon leaving scope
384 class FlagSetting {
385 bool val;
386 bool* flag;
387 public:
388 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
389 ~FlagSetting() { *flag = val; }
390 };
391
392
393 class CounterSetting {
394 intx* counter;
395 public:
396 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
397 ~CounterSetting() { (*counter)--; }
398 };
399
400 class IntFlagSetting {
401 int val;
402 int* flag;
403 public:
404 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
405 ~IntFlagSetting() { *flag = val; }
406 };
407
408 class UIntFlagSetting {
409 uint val;
410 uint* flag;
411 public:
412 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
413 ~UIntFlagSetting() { *flag = val; }
414 };
415
416 class UIntXFlagSetting {
417 uintx val;
418 uintx* flag;
419 public:
420 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
421 ~UIntXFlagSetting() { *flag = val; }
422 };
423
424 class DoubleFlagSetting {
425 double val;
426 double* flag;
427 public:
428 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
429 ~DoubleFlagSetting() { *flag = val; }
430 };
431
432 class SizeTFlagSetting {
433 size_t val;
434 size_t* flag;
435 public:
436 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
437 ~SizeTFlagSetting() { *flag = val; }
438 };
439
440
441 class CommandLineFlags {
442 public:
443 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
444 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
445 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
446 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
447
448 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
449 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); }
450 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
451 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); }
452
453 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
454 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
455 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
456 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); }
457
458 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
459 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
460 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
461 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
462
463 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
464 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
465 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
466 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
467
468 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
469 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); }
470 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
471 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
472
473 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
474 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); }
475 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
476 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
477
478 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
479 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
480 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
481 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
482
483 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
484 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
485 // Contract: Flag will make private copy of the incoming value.
486 // Outgoing value is always malloc-ed, and caller MUST call free.
487 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
488 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
489
490 // Returns false if name is not a command line flag.
491 static bool wasSetOnCmdline(const char* name, bool* value);
492 static void printSetFlags(outputStream* out);
493
494 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
495 static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
496
497 static void verify() PRODUCT_RETURN;
498 };
499
500 // use this for flags that are true by default in the debug version but
501 // false in the optimized version, and vice versa
502 #ifdef ASSERT
503 #define trueInDebug true
504 #define falseInDebug false
505 #else
506 #define trueInDebug false
507 #define falseInDebug true
508 #endif
509
510 // use this for flags that are true per default in the product build
511 // but false in development builds, and vice versa
512 #ifdef PRODUCT
513 #define trueInProduct true
514 #define falseInProduct false
515 #else
516 #define trueInProduct false
517 #define falseInProduct true
518 #endif
519
520 #ifdef JAVASE_EMBEDDED
521 #define falseInEmbedded false
522 #else
523 #define falseInEmbedded true
524 #endif
525
526 // develop flags are settable / visible only during development and are constant in the PRODUCT version
527 // product flags are always settable / visible
528 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
529
530 // A flag must be declared with one of the following types:
531 // bool, intx, uintx, size_t, ccstr, double, or uint64_t.
532 // The type "ccstr" is an alias for "const char*" and is used
533 // only in this file, because the macrology requires single-token type names.
534
535 // Note: Diagnostic options not meant for VM tuning or for product modes.
536 // They are to be used for VM quality assurance or field diagnosis
537 // of VM bugs. They are hidden so that users will not be encouraged to
538 // try them as if they were VM ordinary execution options. However, they
539 // are available in the product version of the VM. Under instruction
540 // from support engineers, VM customers can turn them on to collect
541 // diagnostic information about VM problems. To use a VM diagnostic
542 // option, you must first specify +UnlockDiagnosticVMOptions.
543 // (This master switch also affects the behavior of -Xprintflags.)
544 //
545 // experimental flags are in support of features that are not
546 // part of the officially supported product, but are available
547 // for experimenting with. They could, for example, be performance
548 // features that may not have undergone full or rigorous QA, but which may
549 // help performance in some cases and released for experimentation
550 // by the community of users and developers. This flag also allows one to
551 // be able to build a fully supported product that nonetheless also
552 // ships with some unsupported, lightly tested, experimental features.
553 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
554 // UnlockExperimentalVMOptions flag, which allows the control and
555 // modification of the experimental flags.
556 //
557 // Nota bene: neither diagnostic nor experimental options should be used casually,
558 // and they are not supported on production loads, except under explicit
559 // direction from support engineers.
560 //
561 // manageable flags are writeable external product flags.
562 // They are dynamically writeable through the JDK management interface
563 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
564 // These flags are external exported interface (see CCC). The list of
565 // manageable flags can be queried programmatically through the management
566 // interface.
567 //
568 // A flag can be made as "manageable" only if
569 // - the flag is defined in a CCC as an external exported interface.
570 // - the VM implementation supports dynamic setting of the flag.
571 // This implies that the VM must *always* query the flag variable
572 // and not reuse state related to the flag state at any given time.
573 // - you want the flag to be queried programmatically by the customers.
574 //
575 // product_rw flags are writeable internal product flags.
576 // They are like "manageable" flags but for internal/private use.
577 // The list of product_rw flags are internal/private flags which
578 // may be changed/removed in a future release. It can be set
579 // through the management interface to get/set value
580 // when the name of flag is supplied.
581 //
582 // A flag can be made as "product_rw" only if
583 // - the VM implementation supports dynamic setting of the flag.
584 // This implies that the VM must *always* query the flag variable
585 // and not reuse state related to the flag state at any given time.
586 //
587 // Note that when there is a need to support develop flags to be writeable,
588 // it can be done in the same way as product_rw.
589 //
590 // range is a macro that will expand to min and max arguments for range
591 // checking code if provided - see commandLineFlagRangeList.hpp
592 //
593 // constraint is a macro that will expand to custom function call
594 // for constraint checking if provided - see commandLineFlagConstraintList.hpp
595 //
596
597 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
598 \
599 lp64_product(bool, UseCompressedOops, false, \
600 "Use 32-bit object references in 64-bit VM. " \
601 "lp64_product means flag is always constant in 32 bit VM") \
602 \
603 lp64_product(bool, UseCompressedClassPointers, false, \
604 "Use 32-bit class pointers in 64-bit VM. " \
605 "lp64_product means flag is always constant in 32 bit VM") \
606 \
607 notproduct(bool, CheckCompressedOops, true, \
608 "Generate checks in encoding/decoding code in debug VM") \
609 \
610 product_pd(size_t, HeapBaseMinAddress, \
611 "OS specific low limit for heap base address") \
612 \
613 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
614 "Heap allocation steps through preferred address regions to find" \
615 " where it can allocate the heap. Number of steps to take per " \
616 "region.") \
617 range(1, max_uintx) \
618 \
619 diagnostic(bool, PrintCompressedOopsMode, false, \
620 "Print compressed oops base address and encoding mode") \
621 \
622 lp64_product(intx, ObjectAlignmentInBytes, 8, \
623 "Default object alignment in bytes, 8 is minimum") \
624 range(8, 256) \
625 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
626 \
627 product(bool, AssumeMP, false, \
628 "Instruct the VM to assume multiple processors are available") \
629 \
630 /* UseMembar is theoretically a temp flag used for memory barrier */ \
631 /* removal testing. It was supposed to be removed before FCS but has */ \
632 /* been re-added (see 6401008) */ \
633 product_pd(bool, UseMembar, \
634 "(Unstable) Issues membars on thread state transitions") \
635 \
636 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
637 "Clean the chunk pool asynchronously") \
638 \
639 experimental(bool, AlwaysSafeConstructors, false, \
640 "Force safe construction, as if all fields are final.") \
641 \
642 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
643 "Enable normal processing of flags relating to field diagnostics")\
644 \
645 experimental(bool, UnlockExperimentalVMOptions, false, \
646 "Enable normal processing of flags relating to experimental " \
647 "features") \
648 \
649 product(bool, JavaMonitorsInStackTrace, true, \
650 "Print information about Java monitor locks when the stacks are" \
651 "dumped") \
652 \
653 product_pd(bool, UseLargePages, \
654 "Use large page memory") \
655 \
656 product_pd(bool, UseLargePagesIndividualAllocation, \
657 "Allocate large pages individually for better affinity") \
658 \
659 develop(bool, LargePagesIndividualAllocationInjectError, false, \
660 "Fail large pages individual allocation") \
661 \
662 product(bool, UseLargePagesInMetaspace, false, \
663 "Use large page memory in metaspace. " \
664 "Only used if UseLargePages is enabled.") \
665 \
666 develop(bool, TracePageSizes, false, \
667 "Trace page size selection and usage") \
668 \
669 product(bool, UseNUMA, false, \
670 "Use NUMA if available") \
671 \
672 product(bool, UseNUMAInterleaving, false, \
673 "Interleave memory across NUMA nodes if available") \
674 \
675 product(size_t, NUMAInterleaveGranularity, 2*M, \
676 "Granularity to use for NUMA interleaving on Windows OS") \
677 \
678 product(bool, ForceNUMA, false, \
679 "Force NUMA optimizations on single-node/UMA systems") \
680 \
681 product(uintx, NUMAChunkResizeWeight, 20, \
682 "Percentage (0-100) used to weight the current sample when " \
683 "computing exponentially decaying average for " \
684 "AdaptiveNUMAChunkSizing") \
685 range(0, 100) \
686 \
687 product(size_t, NUMASpaceResizeRate, 1*G, \
688 "Do not reallocate more than this amount per collection") \
689 \
690 product(bool, UseAdaptiveNUMAChunkSizing, true, \
691 "Enable adaptive chunk sizing for NUMA") \
692 \
693 product(bool, NUMAStats, false, \
694 "Print NUMA stats in detailed heap information") \
695 \
696 product(uintx, NUMAPageScanRate, 256, \
697 "Maximum number of pages to include in the page scan procedure") \
698 \
699 product_pd(bool, NeedsDeoptSuspend, \
700 "True for register window machines (sparc/ia64)") \
701 \
702 product(intx, UseSSE, 99, \
703 "Highest supported SSE instructions set on x86/x64") \
704 \
705 product(bool, UseAES, false, \
706 "Control whether AES instructions can be used on x86/x64") \
707 \
708 product(bool, UseSHA, false, \
709 "Control whether SHA instructions can be used " \
710 "on SPARC and on ARM") \
711 \
712 product(bool, UseGHASHIntrinsics, false, \
713 "Use intrinsics for GHASH versions of crypto") \
714 \
715 product(size_t, LargePageSizeInBytes, 0, \
716 "Large page size (0 to let VM choose the page size)") \
717 \
718 product(size_t, LargePageHeapSizeThreshold, 128*M, \
719 "Use large pages if maximum heap is at least this big") \
720 \
721 product(bool, ForceTimeHighResolution, false, \
722 "Using high time resolution (for Win32 only)") \
723 \
724 develop(bool, TraceItables, false, \
725 "Trace initialization and use of itables") \
726 \
727 develop(bool, TracePcPatching, false, \
728 "Trace usage of frame::patch_pc") \
729 \
730 develop(bool, TraceJumps, false, \
731 "Trace assembly jumps in thread ring buffer") \
732 \
733 develop(bool, TraceRelocator, false, \
734 "Trace the bytecode relocator") \
735 \
736 develop(bool, TraceLongCompiles, false, \
737 "Print out every time compilation is longer than " \
738 "a given threshold") \
739 \
740 develop(bool, SafepointALot, false, \
741 "Generate a lot of safepoints. This works with " \
742 "GuaranteedSafepointInterval") \
743 \
744 product_pd(bool, BackgroundCompilation, \
745 "A thread requesting compilation is not blocked during " \
746 "compilation") \
747 \
748 product(bool, PrintVMQWaitTime, false, \
749 "Print out the waiting time in VM operation queue") \
750 \
751 develop(bool, TraceOopMapGeneration, false, \
752 "Show OopMapGeneration") \
753 \
754 product(bool, MethodFlushing, true, \
755 "Reclamation of zombie and not-entrant methods") \
756 \
757 develop(bool, VerifyStack, false, \
758 "Verify stack of each thread when it is entering a runtime call") \
759 \
760 diagnostic(bool, ForceUnreachable, false, \
761 "Make all non code cache addresses to be unreachable by " \
762 "forcing use of 64bit literal fixups") \
763 \
764 notproduct(bool, StressDerivedPointers, false, \
765 "Force scavenge when a derived pointer is detected on stack " \
766 "after rtm call") \
767 \
768 develop(bool, TraceDerivedPointers, false, \
769 "Trace traversal of derived pointers on stack") \
770 \
771 notproduct(bool, TraceCodeBlobStacks, false, \
772 "Trace stack-walk of codeblobs") \
773 \
774 product(bool, PrintJNIResolving, false, \
775 "Used to implement -v:jni") \
776 \
777 notproduct(bool, PrintRewrites, false, \
778 "Print methods that are being rewritten") \
779 \
780 product(bool, UseInlineCaches, true, \
781 "Use Inline Caches for virtual calls ") \
782 \
783 develop(bool, InlineArrayCopy, true, \
784 "Inline arraycopy native that is known to be part of " \
785 "base library DLL") \
786 \
787 develop(bool, InlineObjectHash, true, \
788 "Inline Object::hashCode() native that is known to be part " \
789 "of base library DLL") \
790 \
791 develop(bool, InlineNatives, true, \
792 "Inline natives that are known to be part of base library DLL") \
793 \
794 develop(bool, InlineMathNatives, true, \
795 "Inline SinD, CosD, etc.") \
796 \
797 develop(bool, InlineClassNatives, true, \
798 "Inline Class.isInstance, etc") \
799 \
800 develop(bool, InlineThreadNatives, true, \
801 "Inline Thread.currentThread, etc") \
802 \
803 develop(bool, InlineUnsafeOps, true, \
804 "Inline memory ops (native methods) from sun.misc.Unsafe") \
805 \
806 product(bool, CriticalJNINatives, true, \
807 "Check for critical JNI entry points") \
808 \
809 notproduct(bool, StressCriticalJNINatives, false, \
810 "Exercise register saving code in critical natives") \
811 \
812 product(bool, UseSSE42Intrinsics, false, \
813 "SSE4.2 versions of intrinsics") \
814 \
815 product(bool, UseAESIntrinsics, false, \
816 "Use intrinsics for AES versions of crypto") \
817 \
818 product(bool, UseSHA1Intrinsics, false, \
819 "Use intrinsics for SHA-1 crypto hash function. " \
820 "Requires that UseSHA is enabled.") \
821 \
822 product(bool, UseSHA256Intrinsics, false, \
823 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
824 "Requires that UseSHA is enabled.") \
825 \
826 product(bool, UseSHA512Intrinsics, false, \
827 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
828 "Requires that UseSHA is enabled.") \
829 \
830 product(bool, UseCRC32Intrinsics, false, \
831 "use intrinsics for java.util.zip.CRC32") \
832 \
833 product(bool, UseCRC32CIntrinsics, false, \
834 "use intrinsics for java.util.zip.CRC32C") \
835 \
836 product(bool, UseAdler32Intrinsics, false, \
837 "use intrinsics for java.util.zip.Adler32") \
838 \
839 diagnostic(ccstrlist, DisableIntrinsic, "", \
840 "do not expand intrinsics whose (internal) names appear here") \
841 \
842 develop(bool, TraceCallFixup, false, \
843 "Trace all call fixups") \
844 \
845 develop(bool, DeoptimizeALot, false, \
846 "Deoptimize at every exit from the runtime system") \
847 \
848 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
849 "A comma separated list of bcis to deoptimize at") \
850 \
851 product(bool, DeoptimizeRandom, false, \
852 "Deoptimize random frames on random exit from the runtime system")\
853 \
854 notproduct(bool, ZombieALot, false, \
855 "Create zombies (non-entrant) at exit from the runtime system") \
856 \
857 product(bool, UnlinkSymbolsALot, false, \
858 "Unlink unreferenced symbols from the symbol table at safepoints")\
859 \
860 notproduct(bool, WalkStackALot, false, \
861 "Trace stack (no print) at every exit from the runtime system") \
862 \
863 product(bool, Debugging, false, \
864 "Set when executing debug methods in debug.cpp " \
865 "(to prevent triggering assertions)") \
866 \
867 notproduct(bool, StrictSafepointChecks, trueInDebug, \
868 "Enable strict checks that safepoints cannot happen for threads " \
869 "that use No_Safepoint_Verifier") \
870 \
871 notproduct(bool, VerifyLastFrame, false, \
872 "Verify oops on last frame on entry to VM") \
873 \
874 develop(bool, TraceHandleAllocation, false, \
875 "Print out warnings when suspiciously many handles are allocated")\
876 \
877 product(bool, FailOverToOldVerifier, true, \
878 "Fail over to old verifier when split verifier fails") \
879 \
880 develop(bool, ShowSafepointMsgs, false, \
881 "Show message about safepoint synchronization") \
882 \
883 product(bool, SafepointTimeout, false, \
884 "Time out and warn or fail after SafepointTimeoutDelay " \
885 "milliseconds if failed to reach safepoint") \
886 \
887 develop(bool, DieOnSafepointTimeout, false, \
888 "Die upon failure to reach safepoint (see SafepointTimeout)") \
889 \
890 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
891 /* typically, at most a few retries are needed */ \
892 product(intx, SuspendRetryCount, 50, \
893 "Maximum retry count for an external suspend request") \
894 \
895 product(intx, SuspendRetryDelay, 5, \
896 "Milliseconds to delay per retry (* current_retry_count)") \
897 \
898 product(bool, AssertOnSuspendWaitFailure, false, \
899 "Assert/Guarantee on external suspend wait failure") \
900 \
901 product(bool, TraceSuspendWaitFailures, false, \
902 "Trace external suspend wait failures") \
903 \
904 product(bool, MaxFDLimit, true, \
905 "Bump the number of file descriptors to maximum in Solaris") \
906 \
907 diagnostic(bool, LogEvents, true, \
908 "Enable the various ring buffer event logs") \
909 \
910 diagnostic(uintx, LogEventsBufferEntries, 10, \
911 "Number of ring buffer event logs") \
912 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
913 \
914 product(bool, BytecodeVerificationRemote, true, \
915 "Enable the Java bytecode verifier for remote classes") \
916 \
917 product(bool, BytecodeVerificationLocal, false, \
918 "Enable the Java bytecode verifier for local classes") \
919 \
920 develop(bool, ForceFloatExceptions, trueInDebug, \
921 "Force exceptions on FP stack under/overflow") \
922 \
923 develop(bool, VerifyStackAtCalls, false, \
924 "Verify that the stack pointer is unchanged after calls") \
925 \
926 develop(bool, TraceJavaAssertions, false, \
927 "Trace java language assertions") \
928 \
929 notproduct(bool, CheckAssertionStatusDirectives, false, \
930 "Temporary - see javaClasses.cpp") \
931 \
932 notproduct(bool, PrintMallocFree, false, \
933 "Trace calls to C heap malloc/free allocation") \
934 \
935 product(bool, PrintOopAddress, false, \
936 "Always print the location of the oop") \
937 \
938 notproduct(bool, VerifyCodeCache, false, \
939 "Verify code cache on memory allocation/deallocation") \
940 \
941 develop(bool, UseMallocOnly, false, \
942 "Use only malloc/free for allocation (no resource area/arena)") \
943 \
944 develop(bool, PrintMalloc, false, \
945 "Print all malloc/free calls") \
946 \
947 develop(bool, PrintMallocStatistics, false, \
948 "Print malloc/free statistics") \
949 \
950 develop(bool, ZapResourceArea, trueInDebug, \
951 "Zap freed resource/arena space with 0xABABABAB") \
952 \
953 notproduct(bool, ZapVMHandleArea, trueInDebug, \
954 "Zap freed VM handle space with 0xBCBCBCBC") \
955 \
956 develop(bool, ZapJNIHandleArea, trueInDebug, \
957 "Zap freed JNI handle space with 0xFEFEFEFE") \
958 \
959 notproduct(bool, ZapStackSegments, trueInDebug, \
960 "Zap allocated/freed stack segments with 0xFADFADED") \
961 \
962 develop(bool, ZapUnusedHeapArea, trueInDebug, \
963 "Zap unused heap space with 0xBAADBABE") \
964 \
965 develop(bool, TraceZapUnusedHeapArea, false, \
966 "Trace zapping of unused heap space") \
967 \
968 develop(bool, CheckZapUnusedHeapArea, false, \
969 "Check zapping of unused heap space") \
970 \
971 develop(bool, ZapFillerObjects, trueInDebug, \
972 "Zap filler objects with 0xDEAFBABE") \
973 \
974 develop(bool, PrintVMMessages, true, \
975 "Print VM messages on console") \
976 \
977 product(bool, PrintGCApplicationConcurrentTime, false, \
978 "Print the time the application has been running") \
979 \
980 product(bool, PrintGCApplicationStoppedTime, false, \
981 "Print the time the application has been stopped") \
982 \
983 diagnostic(bool, VerboseVerification, false, \
984 "Display detailed verification details") \
985 \
986 notproduct(uintx, ErrorHandlerTest, 0, \
987 "If > 0, provokes an error after VM initialization; the value " \
988 "determines which error to provoke. See test_error_handler() " \
989 "in debug.cpp.") \
990 \
991 notproduct(uintx, TestCrashInErrorHandler, 0, \
992 "If > 0, provokes an error inside VM error handler (a secondary " \
993 "crash). see test_error_handler() in debug.cpp.") \
994 \
995 notproduct(bool, TestSafeFetchInErrorHandler, false, \
996 "If true, tests SafeFetch inside error handler.") \
997 \
998 develop(bool, Verbose, false, \
999 "Print additional debugging information from other modes") \
1000 \
1001 develop(bool, PrintMiscellaneous, false, \
1002 "Print uncategorized debugging information (requires +Verbose)") \
1003 \
1004 develop(bool, WizardMode, false, \
1005 "Print much more debugging information") \
1006 \
1007 product(bool, ShowMessageBoxOnError, false, \
1008 "Keep process alive on VM fatal error") \
1009 \
1010 product(bool, CreateCoredumpOnCrash, true, \
1011 "Create core/mini dump on VM fatal error") \
1012 \
1013 product(uintx, ErrorLogTimeout, 2 * 60, \
1014 "Timeout, in seconds, to limit the time spent on writing an " \
1015 "error log in case of a crash.") \
1016 \
1017 product_pd(bool, UseOSErrorReporting, \
1018 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
1019 \
1020 product(bool, SuppressFatalErrorMessage, false, \
1021 "Report NO fatal error message (avoid deadlock)") \
1022 \
1023 product(ccstrlist, OnError, "", \
1024 "Run user-defined commands on fatal error; see VMError.cpp " \
1025 "for examples") \
1026 \
1027 product(ccstrlist, OnOutOfMemoryError, "", \
1028 "Run user-defined commands on first java.lang.OutOfMemoryError") \
1029 \
1030 manageable(bool, HeapDumpBeforeFullGC, false, \
1031 "Dump heap to file before any major stop-the-world GC") \
1032 \
1033 manageable(bool, HeapDumpAfterFullGC, false, \
1034 "Dump heap to file after any major stop-the-world GC") \
1035 \
1036 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
1037 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
1038 \
1039 manageable(ccstr, HeapDumpPath, NULL, \
1040 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
1041 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
1042 "in the working directory)") \
1043 \
1044 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \
1045 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
1046 "when the heap usage is larger than this") \
1047 \
1048 develop(size_t, HeapDumpSegmentSize, 1*G, \
1049 "Approximate segment size when generating a segmented heap dump") \
1050 \
1051 develop(bool, BreakAtWarning, false, \
1052 "Execute breakpoint upon encountering VM warning") \
1053 \
1054 develop(bool, TraceVMOperation, false, \
1055 "Trace VM operations") \
1056 \
1057 develop(bool, UseFakeTimers, false, \
1058 "Tell whether the VM should use system time or a fake timer") \
1059 \
1060 product(ccstr, NativeMemoryTracking, "off", \
1061 "Native memory tracking options") \
1062 \
1063 diagnostic(bool, PrintNMTStatistics, false, \
1064 "Print native memory tracking summary data if it is on") \
1065 \
1066 diagnostic(bool, LogCompilation, false, \
1067 "Log compilation activity in detail to LogFile") \
1068 \
1069 product(bool, PrintCompilation, false, \
1070 "Print compilations") \
1071 \
1072 diagnostic(bool, TraceNMethodInstalls, false, \
1073 "Trace nmethod installation") \
1074 \
1075 diagnostic(intx, ScavengeRootsInCode, 2, \
1076 "0: do not allow scavengable oops in the code cache; " \
1077 "1: allow scavenging from the code cache; " \
1078 "2: emit as many constants as the compiler can see") \
1079 range(0, 2) \
1080 \
1081 product(bool, AlwaysRestoreFPU, false, \
1082 "Restore the FPU control word after every JNI call (expensive)") \
1083 \
1084 diagnostic(bool, PrintCompilation2, false, \
1085 "Print additional statistics per compilation") \
1086 \
1087 diagnostic(bool, PrintAdapterHandlers, false, \
1088 "Print code generated for i2c/c2i adapters") \
1089 \
1090 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
1091 "Verify that i2c/c2i adapters are called properly") \
1092 \
1093 develop(bool, VerifyAdapterSharing, false, \
1094 "Verify that the code for shared adapters is the equivalent") \
1095 \
1096 diagnostic(bool, PrintAssembly, false, \
1097 "Print assembly code (using external disassembler.so)") \
1098 \
1099 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
1100 "Print options string passed to disassembler.so") \
1101 \
1102 notproduct(bool, PrintNMethodStatistics, false, \
1103 "Print a summary statistic for the generated nmethods") \
1104 \
1105 diagnostic(bool, PrintNMethods, false, \
1106 "Print assembly code for nmethods when generated") \
1107 \
1108 diagnostic(intx, PrintNMethodsAtLevel, -1, \
1109 "Only print code for nmethods at the given compilation level") \
1110 \
1111 diagnostic(bool, PrintNativeNMethods, false, \
1112 "Print assembly code for native nmethods when generated") \
1113 \
1114 develop(bool, PrintDebugInfo, false, \
1115 "Print debug information for all nmethods when generated") \
1116 \
1117 develop(bool, PrintRelocations, false, \
1118 "Print relocation information for all nmethods when generated") \
1119 \
1120 develop(bool, PrintDependencies, false, \
1121 "Print dependency information for all nmethods when generated") \
1122 \
1123 develop(bool, PrintExceptionHandlers, false, \
1124 "Print exception handler tables for all nmethods when generated") \
1125 \
1126 develop(bool, StressCompiledExceptionHandlers, false, \
1127 "Exercise compiled exception handlers") \
1128 \
1129 develop(bool, InterceptOSException, false, \
1130 "Start debugger when an implicit OS (e.g. NULL) " \
1131 "exception happens") \
1132 \
1133 product(bool, PrintCodeCache, false, \
1134 "Print the code cache memory usage when exiting") \
1135 \
1136 develop(bool, PrintCodeCache2, false, \
1137 "Print detailed usage information on the code cache when exiting")\
1138 \
1139 product(bool, PrintCodeCacheOnCompilation, false, \
1140 "Print the code cache memory usage each time a method is " \
1141 "compiled") \
1142 \
1143 diagnostic(bool, PrintStubCode, false, \
1144 "Print generated stub code") \
1145 \
1146 product(bool, StackTraceInThrowable, true, \
1147 "Collect backtrace in throwable when exception happens") \
1148 \
1149 product(bool, OmitStackTraceInFastThrow, true, \
1150 "Omit backtraces for some 'hot' exceptions in optimized code") \
1151 \
1152 product(bool, ProfilerPrintByteCodeStatistics, false, \
1153 "Print bytecode statistics when dumping profiler output") \
1154 \
1155 product(bool, ProfilerRecordPC, false, \
1156 "Collect ticks for each 16 byte interval of compiled code") \
1157 \
1158 product(bool, ProfileVM, false, \
1159 "Profile ticks that fall within VM (either in the VM Thread " \
1160 "or VM code called through stubs)") \
1161 \
1162 product(bool, ProfileIntervals, false, \
1163 "Print profiles for each interval (see ProfileIntervalsTicks)") \
1164 \
1165 notproduct(bool, ProfilerCheckIntervals, false, \
1166 "Collect and print information on spacing of profiler ticks") \
1167 \
1168 product(bool, PrintWarnings, true, \
1169 "Print JVM warnings to output stream") \
1170 \
1171 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1172 "Print warnings for stalled SpinLocks") \
1173 \
1174 product(bool, RegisterFinalizersAtInit, true, \
1175 "Register finalizable objects at end of Object.<init> or " \
1176 "after allocation") \
1177 \
1178 develop(bool, RegisterReferences, true, \
1179 "Tell whether the VM should register soft/weak/final/phantom " \
1180 "references") \
1181 \
1182 develop(bool, IgnoreRewrites, false, \
1183 "Suppress rewrites of bytecodes in the oopmap generator. " \
1184 "This is unsafe!") \
1185 \
1186 develop(bool, PrintCodeCacheExtension, false, \
1187 "Print extension of code cache") \
1188 \
1189 develop(bool, UsePrivilegedStack, true, \
1190 "Enable the security JVM functions") \
1191 \
1192 develop(bool, ProtectionDomainVerification, true, \
1193 "Verify protection domain before resolution in system dictionary")\
1194 \
1195 product(bool, ClassUnloading, true, \
1196 "Do unloading of classes") \
1197 \
1198 product(bool, ClassUnloadingWithConcurrentMark, true, \
1199 "Do unloading of classes with a concurrent marking cycle") \
1200 \
1201 develop(bool, DisableStartThread, false, \
1202 "Disable starting of additional Java threads " \
1203 "(for debugging only)") \
1204 \
1205 develop(bool, MemProfiling, false, \
1206 "Write memory usage profiling to log file") \
1207 \
1208 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1209 "Print the system dictionary at exit") \
1210 \
1211 experimental(intx, PredictedLoadedClassCount, 0, \
1212 "Experimental: Tune loaded class cache starting size") \
1213 \
1214 diagnostic(bool, UnsyncloadClass, false, \
1215 "Unstable: VM calls loadClass unsynchronized. Custom " \
1216 "class loader must call VM synchronized for findClass " \
1217 "and defineClass.") \
1218 \
1219 product(bool, AlwaysLockClassLoader, false, \
1220 "Require the VM to acquire the class loader lock before calling " \
1221 "loadClass() even for class loaders registering " \
1222 "as parallel capable") \
1223 \
1224 product(bool, AllowParallelDefineClass, false, \
1225 "Allow parallel defineClass requests for class loaders " \
1226 "registering as parallel capable") \
1227 \
1228 product(bool, MustCallLoadClassInternal, false, \
1229 "Call loadClassInternal() rather than loadClass()") \
1230 \
1231 product_pd(bool, DontYieldALot, \
1232 "Throw away obvious excess yield calls") \
1233 \
1234 product_pd(bool, ConvertSleepToYield, \
1235 "Convert sleep(0) to thread yield " \
1236 "(may be off for Solaris to improve GUI)") \
1237 \
1238 product(bool, ConvertYieldToSleep, false, \
1239 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1240 "behavior") \
1241 \
1242 develop(bool, UseDetachedThreads, true, \
1243 "Use detached threads that are recycled upon termination " \
1244 "(for Solaris only)") \
1245 \
1246 product(bool, UseLWPSynchronization, true, \
1247 "Use LWP-based instead of libthread-based synchronization " \
1248 "(SPARC only)") \
1249 \
1250 experimental(ccstr, SyncKnobs, NULL, \
1251 "(Unstable) Various monitor synchronization tunables") \
1252 \
1253 experimental(intx, EmitSync, 0, \
1254 "(Unsafe, Unstable) " \
1255 "Control emission of inline sync fast-path code") \
1256 \
1257 product(intx, MonitorBound, 0, "Bound Monitor population") \
1258 \
1259 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1260 \
1261 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \
1262 "Experimental Sync flags") \
1263 \
1264 experimental(intx, SyncVerbose, 0, "(Unstable)") \
1265 \
1266 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \
1267 \
1268 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
1269 \
1270 experimental(intx, hashCode, 5, \
1271 "(Unstable) select hashCode generation algorithm") \
1272 \
1273 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \
1274 "(Unstable, Linux-specific) " \
1275 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \
1276 \
1277 product(bool, FilterSpuriousWakeups, true, \
1278 "When true prevents OS-level spurious, or premature, wakeups " \
1279 "from Object.wait (Ignored for Windows)") \
1280 \
1281 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \
1282 \
1283 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \
1284 \
1285 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
1286 \
1287 develop(bool, UsePthreads, false, \
1288 "Use pthread-based instead of libthread-based synchronization " \
1289 "(SPARC only)") \
1290 \
1291 product(bool, ReduceSignalUsage, false, \
1292 "Reduce the use of OS signals in Java and/or the VM") \
1293 \
1294 develop_pd(bool, ShareVtableStubs, \
1295 "Share vtable stubs (smaller code but worse branch prediction") \
1296 \
1297 develop(bool, LoadLineNumberTables, true, \
1298 "Tell whether the class file parser loads line number tables") \
1299 \
1300 develop(bool, LoadLocalVariableTables, true, \
1301 "Tell whether the class file parser loads local variable tables") \
1302 \
1303 develop(bool, LoadLocalVariableTypeTables, true, \
1304 "Tell whether the class file parser loads local variable type" \
1305 "tables") \
1306 \
1307 product(bool, AllowUserSignalHandlers, false, \
1308 "Do not complain if the application installs signal handlers " \
1309 "(Solaris & Linux only)") \
1310 \
1311 product(bool, UseSignalChaining, true, \
1312 "Use signal-chaining to invoke signal handlers installed " \
1313 "by the application (Solaris & Linux only)") \
1314 \
1315 product(bool, UseAltSigs, false, \
1316 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1317 "internal signals (Solaris only)") \
1318 \
1319 product(bool, AllowJNIEnvProxy, false, \
1320 "Allow JNIEnv proxies for jdbx") \
1321 \
1322 product(bool, JNIDetachReleasesMonitors, true, \
1323 "JNI DetachCurrentThread releases monitors owned by thread") \
1324 \
1325 product(bool, RestoreMXCSROnJNICalls, false, \
1326 "Restore MXCSR when returning from JNI calls") \
1327 \
1328 product(bool, CheckJNICalls, false, \
1329 "Verify all arguments to JNI calls") \
1330 \
1331 product(bool, CheckEndorsedAndExtDirs, false, \
1332 "Verify the endorsed and extension directories are not used") \
1333 \
1334 product(bool, UseFastJNIAccessors, true, \
1335 "Use optimized versions of Get<Primitive>Field") \
1336 \
1337 product(intx, MaxJNILocalCapacity, 65536, \
1338 "Maximum allowable local JNI handle capacity to " \
1339 "EnsureLocalCapacity() and PushLocalFrame(), " \
1340 "where <= 0 is unlimited, default: 65536") \
1341 \
1342 product(bool, EagerXrunInit, false, \
1343 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1344 "but not all -Xrun libraries may support the state of the VM " \
1345 "at this time") \
1346 \
1347 product(bool, PreserveAllAnnotations, false, \
1348 "Preserve RuntimeInvisibleAnnotations as well " \
1349 "as RuntimeVisibleAnnotations") \
1350 \
1351 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1352 "Number of OutOfMemoryErrors preallocated with backtrace") \
1353 \
1354 product(bool, UseXMMForArrayCopy, false, \
1355 "Use SSE2 MOVQ instruction for Arraycopy") \
1356 \
1357 product(intx, FieldsAllocationStyle, 1, \
1358 "0 - type based with oops first, " \
1359 "1 - with oops last, " \
1360 "2 - oops in super and sub classes are together") \
1361 range(0, 2) \
1362 \
1363 product(bool, CompactFields, true, \
1364 "Allocate nonstatic fields in gaps between previous fields") \
1365 \
1366 notproduct(bool, PrintFieldLayout, false, \
1367 "Print field layout for each class") \
1368 \
1369 /* Need to limit the extent of the padding to reasonable size. */\
1370 /* 8K is well beyond the reasonable HW cache line size, even with */\
1371 /* aggressive prefetching, while still leaving the room for segregating */\
1372 /* among the distinct pages. */\
1373 product(intx, ContendedPaddingWidth, 128, \
1374 "How many bytes to pad the fields/classes marked @Contended with")\
1375 range(0, 8192) \
1376 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \
1377 \
1378 product(bool, EnableContended, true, \
1379 "Enable @Contended annotation support") \
1380 \
1381 product(bool, RestrictContended, true, \
1382 "Restrict @Contended to trusted classes") \
1383 \
1384 product(bool, UseBiasedLocking, true, \
1385 "Enable biased locking in JVM") \
1386 \
1387 product(intx, BiasedLockingStartupDelay, 4000, \
1388 "Number of milliseconds to wait before enabling biased locking") \
1389 \
1390 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1391 "Print statistics of biased locking in JVM") \
1392 \
1393 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1394 "Threshold of number of revocations per type to try to " \
1395 "rebias all objects in the heap of that type") \
1396 \
1397 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1398 "Threshold of number of revocations per type to permanently " \
1399 "revoke biases of all objects in the heap of that type") \
1400 \
1401 product(intx, BiasedLockingDecayTime, 25000, \
1402 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1403 "type after previous bulk rebias") \
1404 \
1405 /* tracing */ \
1406 \
1407 notproduct(bool, TraceRuntimeCalls, false, \
1408 "Trace run-time calls") \
1409 \
1410 develop(bool, TraceJNICalls, false, \
1411 "Trace JNI calls") \
1412 \
1413 develop(bool, StressRewriter, false, \
1414 "Stress linktime bytecode rewriting") \
1415 \
1416 notproduct(bool, TraceJVMCalls, false, \
1417 "Trace JVM calls") \
1418 \
1419 product(ccstr, TraceJVMTI, NULL, \
1420 "Trace flags for JVMTI functions and events") \
1421 \
1422 /* This option can change an EMCP method into an obsolete method. */ \
1423 /* This can affect tests that except specific methods to be EMCP. */ \
1424 /* This option should be used with caution. */ \
1425 product(bool, StressLdcRewrite, false, \
1426 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1427 \
1428 product(intx, TraceRedefineClasses, 0, \
1429 "Trace level for JVMTI RedefineClasses") \
1430 \
1431 /* change to false by default sometime after Mustang */ \
1432 product(bool, VerifyMergedCPBytecodes, true, \
1433 "Verify bytecodes after RedefineClasses constant pool merging") \
1434 \
1435 develop(bool, TraceJNIHandleAllocation, false, \
1436 "Trace allocation/deallocation of JNI handle blocks") \
1437 \
1438 develop(bool, TraceBytecodes, false, \
1439 "Trace bytecode execution") \
1440 \
1441 develop(bool, TraceClassInitialization, false, \
1442 "Trace class initialization") \
1443 \
1444 product(bool, TraceExceptions, false, \
1445 "Trace exceptions") \
1446 \
1447 develop(bool, TraceICs, false, \
1448 "Trace inline cache changes") \
1449 \
1450 notproduct(bool, TraceInvocationCounterOverflow, false, \
1451 "Trace method invocation counter overflow") \
1452 \
1453 develop(bool, TraceInlineCacheClearing, false, \
1454 "Trace clearing of inline caches in nmethods") \
1455 \
1456 develop(bool, TraceDependencies, false, \
1457 "Trace dependencies") \
1458 \
1459 develop(bool, VerifyDependencies, trueInDebug, \
1460 "Exercise and verify the compilation dependency mechanism") \
1461 \
1462 develop(bool, TraceNewOopMapGeneration, false, \
1463 "Trace OopMapGeneration") \
1464 \
1465 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1466 "Trace OopMapGeneration: print detailed cell states") \
1467 \
1468 develop(bool, TimeOopMap, false, \
1469 "Time calls to GenerateOopMap::compute_map() in sum") \
1470 \
1471 develop(bool, TimeOopMap2, false, \
1472 "Time calls to GenerateOopMap::compute_map() individually") \
1473 \
1474 develop(bool, TraceMonitorMismatch, false, \
1475 "Trace monitor matching failures during OopMapGeneration") \
1476 \
1477 develop(bool, TraceOopMapRewrites, false, \
1478 "Trace rewriting of method oops during oop map generation") \
1479 \
1480 develop(bool, TraceSafepoint, false, \
1481 "Trace safepoint operations") \
1482 \
1483 develop(bool, TraceICBuffer, false, \
1484 "Trace usage of IC buffer") \
1485 \
1486 develop(bool, TraceCompiledIC, false, \
1487 "Trace changes of compiled IC") \
1488 \
1489 develop(bool, TraceStartupTime, false, \
1490 "Trace setup time") \
1491 \
1492 develop(bool, TraceProtectionDomainVerification, false, \
1493 "Trace protection domain verification") \
1494 \
1495 develop(bool, TraceClearedExceptions, false, \
1496 "Print when an exception is forcibly cleared") \
1497 \
1498 product(bool, TraceClassResolution, false, \
1499 "Trace all constant pool resolutions (for debugging)") \
1500 \
1501 product(bool, TraceBiasedLocking, false, \
1502 "Trace biased locking in JVM") \
1503 \
1504 product(bool, TraceMonitorInflation, false, \
1505 "Trace monitor inflation in JVM") \
1506 \
1507 /* gc */ \
1508 \
1509 product(bool, UseSerialGC, false, \
1510 "Use the Serial garbage collector") \
1511 \
1512 product(bool, UseG1GC, false, \
1513 "Use the Garbage-First garbage collector") \
1514 \
1515 product(bool, UseParallelGC, false, \
1516 "Use the Parallel Scavenge garbage collector") \
1517 \
1518 product(bool, UseParallelOldGC, false, \
1519 "Use the Parallel Old garbage collector") \
1520 \
1521 product(uintx, HeapMaximumCompactionInterval, 20, \
1522 "How often should we maximally compact the heap (not allowing " \
1523 "any dead space)") \
1524 \
1525 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1526 "The collection count for the first maximum compaction") \
1527 \
1528 product(bool, UseMaximumCompactionOnSystemGC, true, \
1529 "Use maximum compaction in the Parallel Old garbage collector " \
1530 "for a system GC") \
1531 \
1532 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1533 "The mean used by the parallel compact dead wood " \
1534 "limiter (a number between 0-100)") \
1535 range(0, 100) \
1536 \
1537 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1538 "The standard deviation used by the parallel compact dead wood " \
1539 "limiter (a number between 0-100)") \
1540 range(0, 100) \
1541 \
1542 product(uint, ParallelGCThreads, 0, \
1543 "Number of parallel threads parallel gc will use") \
1544 \
1545 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \
1546 "Use semaphore synchronization for the GC Threads, " \
1547 "instead of synchronization based on mutexes") \
1548 \
1549 product(bool, UseDynamicNumberOfGCThreads, false, \
1550 "Dynamically choose the number of parallel threads " \
1551 "parallel gc will use") \
1552 \
1553 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1554 "Force dynamic selection of the number of " \
1555 "parallel threads parallel gc will use to aid debugging") \
1556 \
1557 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1558 "Size of heap (bytes) per GC thread used in calculating the " \
1559 "number of GC threads") \
1560 range((size_t)os::vm_page_size(), (size_t)max_uintx) \
1561 \
1562 product(bool, TraceDynamicGCThreads, false, \
1563 "Trace the dynamic GC thread usage") \
1564 \
1565 develop(bool, ParallelOldGCSplitALot, false, \
1566 "Provoke splitting (copying data from a young gen space to " \
1567 "multiple destination spaces)") \
1568 \
1569 develop(uintx, ParallelOldGCSplitInterval, 3, \
1570 "How often to provoke splitting a young gen space") \
1571 range(0, max_uintx) \
1572 \
1573 product(uint, ConcGCThreads, 0, \
1574 "Number of threads concurrent gc will use") \
1575 \
1576 product(size_t, YoungPLABSize, 4096, \
1577 "Size of young gen promotion LAB's (in HeapWords)") \
1578 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \
1579 \
1580 product(size_t, OldPLABSize, 1024, \
1581 "Size of old gen promotion LAB's (in HeapWords), or Number \
1582 of blocks to attempt to claim when refilling CMS LAB's") \
1583 \
1584 product(uintx, GCTaskTimeStampEntries, 200, \
1585 "Number of time stamp entries per gc worker thread") \
1586 range(1, max_uintx) \
1587 \
1588 product(bool, AlwaysTenure, false, \
1589 "Always tenure objects in eden (ParallelGC only)") \
1590 \
1591 product(bool, NeverTenure, false, \
1592 "Never tenure objects in eden, may tenure on overflow " \
1593 "(ParallelGC only)") \
1594 \
1595 product(bool, ScavengeBeforeFullGC, true, \
1596 "Scavenge youngest generation before each full GC.") \
1597 \
1598 develop(bool, ScavengeWithObjectsInToSpace, false, \
1599 "Allow scavenges to occur when to-space contains objects") \
1600 \
1601 product(bool, UseConcMarkSweepGC, false, \
1602 "Use Concurrent Mark-Sweep GC in the old generation") \
1603 \
1604 product(bool, ExplicitGCInvokesConcurrent, false, \
1605 "A System.gc() request invokes a concurrent collection; " \
1606 "(effective only when using concurrent collectors)") \
1607 \
1608 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1609 "A System.gc() request invokes a concurrent collection and " \
1610 "also unloads classes during such a concurrent gc cycle " \
1611 "(effective only when UseConcMarkSweepGC)") \
1612 \
1613 product(bool, GCLockerInvokesConcurrent, false, \
1614 "The exit of a JNI critical section necessitating a scavenge, " \
1615 "also kicks off a background concurrent collection") \
1616 \
1617 product(uintx, GCLockerEdenExpansionPercent, 5, \
1618 "How much the GC can expand the eden by while the GC locker " \
1619 "is active (as a percentage)") \
1620 range(0, 100) \
1621 \
1622 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \
1623 "Number of times to retry allocations when " \
1624 "blocked by the GC locker") \
1625 \
1626 develop(bool, UseCMSAdaptiveFreeLists, true, \
1627 "Use adaptive free lists in the CMS generation") \
1628 \
1629 develop(bool, UseAsyncConcMarkSweepGC, true, \
1630 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1631 \
1632 product(bool, UseCMSBestFit, true, \
1633 "Use CMS best fit allocation strategy") \
1634 \
1635 product(bool, UseParNewGC, false, \
1636 "Use parallel threads in the new generation") \
1637 \
1638 product(bool, PrintTaskqueue, false, \
1639 "Print taskqueue statistics for parallel collectors") \
1640 \
1641 product(bool, PrintTerminationStats, false, \
1642 "Print termination statistics for parallel collectors") \
1643 \
1644 product(uintx, ParallelGCBufferWastePct, 10, \
1645 "Wasted fraction of parallel allocation buffer") \
1646 range(0, 100) \
1647 \
1648 product(uintx, TargetPLABWastePct, 10, \
1649 "Target wasted space in last buffer as percent of overall " \
1650 "allocation") \
1651 range(1, 100) \
1652 \
1653 product(uintx, PLABWeight, 75, \
1654 "Percentage (0-100) used to weight the current sample when " \
1655 "computing exponentially decaying average for ResizePLAB") \
1656 range(0, 100) \
1657 \
1658 product(bool, ResizePLAB, true, \
1659 "Dynamically resize (survivor space) promotion LAB's") \
1660 \
1661 product(bool, PrintPLAB, false, \
1662 "Print (survivor space) promotion LAB's sizing decisions") \
1663 \
1664 product(intx, ParGCArrayScanChunk, 50, \
1665 "Scan a subset of object array and push remainder, if array is " \
1666 "bigger than this") \
1667 range(1, max_intx) \
1668 \
1669 product(bool, ParGCUseLocalOverflow, false, \
1670 "Instead of a global overflow list, use local overflow stacks") \
1671 \
1672 product(bool, ParGCTrimOverflow, true, \
1673 "Eagerly trim the local overflow lists " \
1674 "(when ParGCUseLocalOverflow)") \
1675 \
1676 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1677 "Simulate work queue overflow in ParNew") \
1678 \
1679 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1680 "An `interval' counter that determines how frequently " \
1681 "we simulate overflow; a smaller number increases frequency") \
1682 \
1683 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1684 "The desired number of objects to claim from the overflow list") \
1685 \
1686 diagnostic(uintx, ParGCStridesPerThread, 2, \
1687 "The number of strides per worker thread that we divide up the " \
1688 "card table scanning work into") \
1689 range(1, max_uintx) \
1690 \
1691 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1692 "The number of cards in each chunk of the parallel chunks used " \
1693 "during card table scanning") \
1694 range(1, max_intx) \
1695 \
1696 product(uintx, OldPLABWeight, 50, \
1697 "Percentage (0-100) used to weight the current sample when " \
1698 "computing exponentially decaying average for resizing " \
1699 "OldPLABSize") \
1700 range(0, 100) \
1701 \
1702 product(bool, ResizeOldPLAB, true, \
1703 "Dynamically resize (old gen) promotion LAB's") \
1704 \
1705 product(bool, PrintOldPLAB, false, \
1706 "Print (old gen) promotion LAB's sizing decisions") \
1707 \
1708 product(size_t, CMSOldPLABMax, 1024, \
1709 "Maximum size of CMS gen promotion LAB caches per worker " \
1710 "per block size") \
1711 range(1, max_uintx) \
1712 \
1713 product(size_t, CMSOldPLABMin, 16, \
1714 "Minimum size of CMS gen promotion LAB caches per worker " \
1715 "per block size") \
1716 range(1, max_uintx) \
1717 constraint(CMSOldPLABMinConstraintFunc,AfterErgo) \
1718 \
1719 product(uintx, CMSOldPLABNumRefills, 4, \
1720 "Nominal number of refills of CMS gen promotion LAB cache " \
1721 "per worker per block size") \
1722 range(1, max_uintx) \
1723 \
1724 product(bool, CMSOldPLABResizeQuicker, false, \
1725 "React on-the-fly during a scavenge to a sudden " \
1726 "change in block demand rate") \
1727 \
1728 product(uintx, CMSOldPLABToleranceFactor, 4, \
1729 "The tolerance of the phase-change detector for on-the-fly " \
1730 "PLAB resizing during a scavenge") \
1731 range(1, max_uintx) \
1732 \
1733 product(uintx, CMSOldPLABReactivityFactor, 2, \
1734 "The gain in the feedback loop for on-the-fly PLAB resizing " \
1735 "during a scavenge") \
1736 \
1737 product(bool, AlwaysPreTouch, false, \
1738 "Force all freshly committed pages to be pre-touched") \
1739 \
1740 product_pd(size_t, CMSYoungGenPerWorker, \
1741 "The maximum size of young gen chosen by default per GC worker " \
1742 "thread available") \
1743 range(1, max_uintx) \
1744 \
1745 product(uintx, CMSIncrementalSafetyFactor, 10, \
1746 "Percentage (0-100) used to add conservatism when computing the " \
1747 "duty cycle") \
1748 range(0, 100) \
1749 \
1750 product(uintx, CMSExpAvgFactor, 50, \
1751 "Percentage (0-100) used to weight the current sample when " \
1752 "computing exponential averages for CMS statistics") \
1753 range(0, 100) \
1754 \
1755 product(uintx, CMS_FLSWeight, 75, \
1756 "Percentage (0-100) used to weight the current sample when " \
1757 "computing exponentially decaying averages for CMS FLS " \
1758 "statistics") \
1759 range(0, 100) \
1760 \
1761 product(uintx, CMS_FLSPadding, 1, \
1762 "The multiple of deviation from mean to use for buffering " \
1763 "against volatility in free list demand") \
1764 \
1765 product(uintx, FLSCoalescePolicy, 2, \
1766 "CMS: aggressiveness level for coalescing, increasing " \
1767 "from 0 to 4") \
1768 range(0, 4) \
1769 \
1770 product(bool, FLSAlwaysCoalesceLarge, false, \
1771 "CMS: larger free blocks are always available for coalescing") \
1772 \
1773 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1774 "CMS: the smaller the percentage the greater the coalescing " \
1775 "force") \
1776 \
1777 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1778 "CMS: the factor by which to inflate estimated demand of small " \
1779 "block sizes to prevent coalescing with an adjoining block") \
1780 \
1781 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1782 "CMS: the factor by which to inflate estimated demand of large " \
1783 "block sizes to prevent coalescing with an adjoining block") \
1784 \
1785 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1786 "CMS: the factor by which to inflate estimated demand of small " \
1787 "block sizes to prevent splitting to supply demand for smaller " \
1788 "blocks") \
1789 \
1790 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1791 "CMS: the factor by which to inflate estimated demand of large " \
1792 "block sizes to prevent splitting to supply demand for smaller " \
1793 "blocks") \
1794 \
1795 product(bool, CMSExtrapolateSweep, false, \
1796 "CMS: cushion for block demand during sweep") \
1797 \
1798 product(uintx, CMS_SweepWeight, 75, \
1799 "Percentage (0-100) used to weight the current sample when " \
1800 "computing exponentially decaying average for inter-sweep " \
1801 "duration") \
1802 range(0, 100) \
1803 \
1804 product(uintx, CMS_SweepPadding, 1, \
1805 "The multiple of deviation from mean to use for buffering " \
1806 "against volatility in inter-sweep duration") \
1807 \
1808 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1809 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1810 "duration exceeds this threshold in milliseconds") \
1811 \
1812 product(bool, CMSClassUnloadingEnabled, true, \
1813 "Whether class unloading enabled when using CMS GC") \
1814 \
1815 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1816 "When CMS class unloading is enabled, the maximum CMS cycle " \
1817 "count for which classes may not be unloaded") \
1818 \
1819 develop(intx, CMSDictionaryChoice, 0, \
1820 "Use BinaryTreeDictionary as default in the CMS generation") \
1821 \
1822 product(uintx, CMSIndexedFreeListReplenish, 4, \
1823 "Replenish an indexed free list with this number of chunks") \
1824 \
1825 product(bool, CMSReplenishIntermediate, true, \
1826 "Replenish all intermediate free-list caches") \
1827 \
1828 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1829 "When satisfying batched demand, split blocks from the " \
1830 "IndexedFreeList whose size is a multiple of requested size") \
1831 \
1832 product(bool, CMSLoopWarn, false, \
1833 "Warn in case of excessive CMS looping") \
1834 \
1835 develop(bool, CMSOverflowEarlyRestoration, false, \
1836 "Restore preserved marks early") \
1837 \
1838 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1839 "Size of marking stack") \
1840 \
1841 /* where does the range max value of (max_jint - 1) come from? */ \
1842 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1843 "Maximum size of marking stack") \
1844 range(1, (max_jint - 1)) \
1845 \
1846 notproduct(bool, CMSMarkStackOverflowALot, false, \
1847 "Simulate frequent marking stack / work queue overflow") \
1848 \
1849 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1850 "An \"interval\" counter that determines how frequently " \
1851 "to simulate overflow; a smaller number increases frequency") \
1852 \
1853 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1854 "Maximum number of abortable preclean iterations, if > 0") \
1855 \
1856 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1857 "Maximum time in abortable preclean (in milliseconds)") \
1858 \
1859 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1860 "Nominal minimum work per abortable preclean iteration") \
1861 \
1862 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1863 "Time that we sleep between iterations when not given " \
1864 "enough work per iteration") \
1865 \
1866 product(size_t, CMSRescanMultiple, 32, \
1867 "Size (in cards) of CMS parallel rescan task") \
1868 range(1, max_uintx) \
1869 \
1870 product(size_t, CMSConcMarkMultiple, 32, \
1871 "Size (in cards) of CMS concurrent MT marking task") \
1872 range(1, max_uintx) \
1873 \
1874 product(bool, CMSAbortSemantics, false, \
1875 "Whether abort-on-overflow semantics is implemented") \
1876 \
1877 product(bool, CMSParallelInitialMarkEnabled, true, \
1878 "Use the parallel initial mark.") \
1879 \
1880 product(bool, CMSParallelRemarkEnabled, true, \
1881 "Whether parallel remark enabled (only if ParNewGC)") \
1882 \
1883 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1884 "Whether parallel remark of survivor space " \
1885 "enabled (effective only if CMSParallelRemarkEnabled)") \
1886 \
1887 product(bool, CMSPLABRecordAlways, true, \
1888 "Always record survivor space PLAB boundaries (effective only " \
1889 "if CMSParallelSurvivorRemarkEnabled)") \
1890 \
1891 product(bool, CMSEdenChunksRecordAlways, true, \
1892 "Always record eden chunks used for the parallel initial mark " \
1893 "or remark of eden") \
1894 \
1895 product(bool, CMSPrintEdenSurvivorChunks, false, \
1896 "Print the eden and the survivor chunks used for the parallel " \
1897 "initial mark or remark of the eden/survivor spaces") \
1898 \
1899 product(bool, CMSConcurrentMTEnabled, true, \
1900 "Whether multi-threaded concurrent work enabled " \
1901 "(effective only if ParNewGC)") \
1902 \
1903 product(bool, CMSPrecleaningEnabled, true, \
1904 "Whether concurrent precleaning enabled") \
1905 \
1906 product(uintx, CMSPrecleanIter, 3, \
1907 "Maximum number of precleaning iteration passes") \
1908 range(0, 9) \
1909 \
1910 product(uintx, CMSPrecleanDenominator, 3, \
1911 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1912 "ratio") \
1913 range(1, max_uintx) \
1914 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \
1915 \
1916 product(uintx, CMSPrecleanNumerator, 2, \
1917 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1918 "ratio") \
1919 range(0, max_uintx-1) \
1920 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \
1921 \
1922 product(bool, CMSPrecleanRefLists1, true, \
1923 "Preclean ref lists during (initial) preclean phase") \
1924 \
1925 product(bool, CMSPrecleanRefLists2, false, \
1926 "Preclean ref lists during abortable preclean phase") \
1927 \
1928 product(bool, CMSPrecleanSurvivors1, false, \
1929 "Preclean survivors during (initial) preclean phase") \
1930 \
1931 product(bool, CMSPrecleanSurvivors2, true, \
1932 "Preclean survivors during abortable preclean phase") \
1933 \
1934 product(uintx, CMSPrecleanThreshold, 1000, \
1935 "Do not iterate again if number of dirty cards is less than this")\
1936 range(100, max_uintx) \
1937 \
1938 product(bool, CMSCleanOnEnter, true, \
1939 "Clean-on-enter optimization for reducing number of dirty cards") \
1940 \
1941 product(uintx, CMSRemarkVerifyVariant, 1, \
1942 "Choose variant (1,2) of verification following remark") \
1943 range(1, 2) \
1944 \
1945 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1946 "If Eden size is below this, do not try to schedule remark") \
1947 \
1948 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1949 "The Eden occupancy percentage (0-100) at which " \
1950 "to try and schedule remark pause") \
1951 range(0, 100) \
1952 \
1953 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1954 "Start sampling eden top at least before young gen " \
1955 "occupancy reaches 1/<ratio> of the size at which " \
1956 "we plan to schedule remark") \
1957 range(1, max_uintx) \
1958 \
1959 product(uintx, CMSSamplingGrain, 16*K, \
1960 "The minimum distance between eden samples for CMS (see above)") \
1961 range(1, max_uintx) \
1962 \
1963 product(bool, CMSScavengeBeforeRemark, false, \
1964 "Attempt scavenge before the CMS remark step") \
1965 \
1966 develop(bool, CMSTraceSweeper, false, \
1967 "Trace some actions of the CMS sweeper") \
1968 \
1969 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1970 "Don't drain below this size per parallel worker/thief") \
1971 \
1972 manageable(intx, CMSWaitDuration, 2000, \
1973 "Time in milliseconds that CMS thread waits for young GC") \
1974 \
1975 develop(uintx, CMSCheckInterval, 1000, \
1976 "Interval in milliseconds that CMS thread checks if it " \
1977 "should start a collection cycle") \
1978 \
1979 product(bool, CMSYield, true, \
1980 "Yield between steps of CMS") \
1981 \
1982 product(size_t, CMSBitMapYieldQuantum, 10*M, \
1983 "Bitmap operations should process at most this many bits " \
1984 "between yields") \
1985 range(1, max_uintx) \
1986 \
1987 product(bool, CMSDumpAtPromotionFailure, false, \
1988 "Dump useful information about the state of the CMS old " \
1989 "generation upon a promotion failure") \
1990 \
1991 product(bool, CMSPrintChunksInDump, false, \
1992 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1993 "more detailed information about the free chunks") \
1994 \
1995 product(bool, CMSPrintObjectsInDump, false, \
1996 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1997 "more detailed information about the allocated objects") \
1998 \
1999 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
2000 "Verify that all references across the FLS boundary " \
2001 "are to valid objects") \
2002 \
2003 diagnostic(bool, FLSVerifyLists, false, \
2004 "Do lots of (expensive) FreeListSpace verification") \
2005 \
2006 diagnostic(bool, FLSVerifyIndexTable, false, \
2007 "Do lots of (expensive) FLS index table verification") \
2008 \
2009 develop(bool, FLSVerifyDictionary, false, \
2010 "Do lots of (expensive) FLS dictionary verification") \
2011 \
2012 develop(bool, VerifyBlockOffsetArray, false, \
2013 "Do (expensive) block offset array verification") \
2014 \
2015 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
2016 "Maintain _unallocated_block in BlockOffsetArray " \
2017 "(currently applicable only to CMS collector)") \
2018 \
2019 develop(bool, TraceCMSState, false, \
2020 "Trace the state of the CMS collection") \
2021 \
2022 product(intx, RefDiscoveryPolicy, 0, \
2023 "Select type of reference discovery policy: " \
2024 "reference-based(0) or referent-based(1)") \
2025 range(ReferenceProcessor::DiscoveryPolicyMin, \
2026 ReferenceProcessor::DiscoveryPolicyMax) \
2027 \
2028 product(bool, ParallelRefProcEnabled, false, \
2029 "Enable parallel reference processing whenever possible") \
2030 \
2031 product(bool, ParallelRefProcBalancingEnabled, true, \
2032 "Enable balancing of reference processing queues") \
2033 \
2034 product(uintx, CMSTriggerRatio, 80, \
2035 "Percentage of MinHeapFreeRatio in CMS generation that is " \
2036 "allocated before a CMS collection cycle commences") \
2037 range(0, 100) \
2038 \
2039 product(uintx, CMSBootstrapOccupancy, 50, \
2040 "Percentage CMS generation occupancy at which to " \
2041 "initiate CMS collection for bootstrapping collection stats") \
2042 range(0, 100) \
2043 \
2044 product(intx, CMSInitiatingOccupancyFraction, -1, \
2045 "Percentage CMS generation occupancy to start a CMS collection " \
2046 "cycle. A negative value means that CMSTriggerRatio is used") \
2047 range(min_intx, 100) \
2048 \
2049 product(uintx, InitiatingHeapOccupancyPercent, 45, \
2050 "Percentage of the (entire) heap occupancy to start a " \
2051 "concurrent GC cycle. It is used by GCs that trigger a " \
2052 "concurrent GC cycle based on the occupancy of the entire heap, " \
2053 "not just one of the generations (e.g., G1). A value of 0 " \
2054 "denotes 'do constant GC cycles'.") \
2055 range(0, 100) \
2056 \
2057 manageable(intx, CMSTriggerInterval, -1, \
2058 "Commence a CMS collection cycle (at least) every so many " \
2059 "milliseconds (0 permanently, -1 disabled)") \
2060 range(-1, max_intx) \
2061 \
2062 product(bool, UseCMSInitiatingOccupancyOnly, false, \
2063 "Only use occupancy as a criterion for starting a CMS collection")\
2064 \
2065 product(uintx, CMSIsTooFullPercentage, 98, \
2066 "An absolute ceiling above which CMS will always consider the " \
2067 "unloading of classes when class unloading is enabled") \
2068 range(0, 100) \
2069 \
2070 develop(bool, CMSTestInFreeList, false, \
2071 "Check if the coalesced range is already in the " \
2072 "free lists as claimed") \
2073 \
2074 notproduct(bool, CMSVerifyReturnedBytes, false, \
2075 "Check that all the garbage collected was returned to the " \
2076 "free lists") \
2077 \
2078 notproduct(bool, ScavengeALot, false, \
2079 "Force scavenge at every Nth exit from the runtime system " \
2080 "(N=ScavengeALotInterval)") \
2081 \
2082 develop(bool, FullGCALot, false, \
2083 "Force full gc at every Nth exit from the runtime system " \
2084 "(N=FullGCALotInterval)") \
2085 \
2086 notproduct(bool, GCALotAtAllSafepoints, false, \
2087 "Enforce ScavengeALot/GCALot at all potential safepoints") \
2088 \
2089 product(bool, PrintPromotionFailure, false, \
2090 "Print additional diagnostic information following " \
2091 "promotion failure") \
2092 \
2093 notproduct(bool, PromotionFailureALot, false, \
2094 "Use promotion failure handling on every youngest generation " \
2095 "collection") \
2096 \
2097 develop(uintx, PromotionFailureALotCount, 1000, \
2098 "Number of promotion failures occurring at PLAB " \
2099 "refill attempts (ParNew) or promotion attempts " \
2100 "(other young collectors)") \
2101 \
2102 develop(uintx, PromotionFailureALotInterval, 5, \
2103 "Total collections between promotion failures a lot") \
2104 \
2105 experimental(uintx, WorkStealingSleepMillis, 1, \
2106 "Sleep time when sleep is used for yields") \
2107 \
2108 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
2109 "Number of yields before a sleep is done during work stealing") \
2110 \
2111 experimental(uintx, WorkStealingHardSpins, 4096, \
2112 "Number of iterations in a spin loop between checks on " \
2113 "time out of hard spin") \
2114 \
2115 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
2116 "Ratio of hard spins to calls to yield") \
2117 \
2118 develop(uintx, ObjArrayMarkingStride, 512, \
2119 "Number of object array elements to push onto the marking stack " \
2120 "before pushing a continuation entry") \
2121 \
2122 develop(bool, MetadataAllocationFailALot, false, \
2123 "Fail metadata allocations at intervals controlled by " \
2124 "MetadataAllocationFailALotInterval") \
2125 \
2126 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
2127 "Metadata allocation failure a lot interval") \
2128 \
2129 develop(bool, TraceMetadataChunkAllocation, false, \
2130 "Trace chunk metadata allocations") \
2131 \
2132 product(bool, TraceMetadataHumongousAllocation, false, \
2133 "Trace humongous metadata allocations") \
2134 \
2135 develop(bool, TraceMetavirtualspaceAllocation, false, \
2136 "Trace virtual space metadata allocations") \
2137 \
2138 notproduct(bool, ExecuteInternalVMTests, false, \
2139 "Enable execution of internal VM tests") \
2140 \
2141 notproduct(bool, VerboseInternalVMTests, false, \
2142 "Turn on logging for internal VM tests.") \
2143 \
2144 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
2145 \
2146 product_pd(bool, ResizeTLAB, \
2147 "Dynamically resize TLAB size for threads") \
2148 \
2149 product(bool, ZeroTLAB, false, \
2150 "Zero out the newly created TLAB") \
2151 \
2152 product(bool, FastTLABRefill, true, \
2153 "Use fast TLAB refill code") \
2154 \
2155 product(bool, PrintTLAB, false, \
2156 "Print various TLAB related information") \
2157 \
2158 product(bool, TLABStats, true, \
2159 "Provide more detailed and expensive TLAB statistics " \
2160 "(with PrintTLAB)") \
2161 \
2162 product_pd(bool, NeverActAsServerClassMachine, \
2163 "Never act like a server-class machine") \
2164 \
2165 product(bool, AlwaysActAsServerClassMachine, false, \
2166 "Always act like a server-class machine") \
2167 \
2168 product_pd(uint64_t, MaxRAM, \
2169 "Real memory size (in bytes) used to set maximum heap size") \
2170 \
2171 product(size_t, ErgoHeapSizeLimit, 0, \
2172 "Maximum ergonomically set heap size (in bytes); zero means use " \
2173 "MaxRAM / MaxRAMFraction") \
2174 \
2175 product(uintx, MaxRAMFraction, 4, \
2176 "Maximum fraction (1/n) of real memory used for maximum heap " \
2177 "size") \
2178 range(1, max_uintx) \
2179 \
2180 product(uintx, MinRAMFraction, 2, \
2181 "Minimum fraction (1/n) of real memory used for maximum heap " \
2182 "size on systems with small physical memory size") \
2183 range(1, max_uintx) \
2184 \
2185 product(uintx, InitialRAMFraction, 64, \
2186 "Fraction (1/n) of real memory used for initial heap size") \
2187 range(1, max_uintx) \
2188 \
2189 develop(uintx, MaxVirtMemFraction, 2, \
2190 "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2191 "determining maximum heap size") \
2192 \
2193 product(bool, UseAutoGCSelectPolicy, false, \
2194 "Use automatic collection selection policy") \
2195 \
2196 product(uintx, AutoGCSelectPauseMillis, 5000, \
2197 "Automatic GC selection pause threshold in milliseconds") \
2198 \
2199 product(bool, UseAdaptiveSizePolicy, true, \
2200 "Use adaptive generation sizing policies") \
2201 \
2202 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2203 "Use adaptive survivor sizing policies") \
2204 \
2205 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2206 "Use adaptive young-old sizing policies at minor collections") \
2207 \
2208 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2209 "Use adaptive young-old sizing policies at major collections") \
2210 \
2211 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2212 "Include statistics from System.gc() for adaptive size policy") \
2213 \
2214 product(bool, UseAdaptiveGCBoundary, false, \
2215 "Allow young-old boundary to move") \
2216 \
2217 develop(bool, TraceAdaptiveGCBoundary, false, \
2218 "Trace young-old boundary moves") \
2219 \
2220 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2221 "Resize the virtual spaces of the young or old generations") \
2222 \
2223 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2224 "Policy for changing generation size for throughput goals") \
2225 \
2226 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2227 "Adjust tenured generation to achieve a minor pause goal") \
2228 \
2229 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2230 "Adjust young generation to achieve a major pause goal") \
2231 \
2232 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2233 "Number of steps where heuristics is used before data is used") \
2234 \
2235 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2236 "Number of collections before the adaptive sizing is started") \
2237 \
2238 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2239 "Collection interval for printing information; zero means never") \
2240 \
2241 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2242 "Use adaptive minimum footprint as a goal") \
2243 \
2244 product(uintx, AdaptiveSizePolicyWeight, 10, \
2245 "Weight given to exponential resizing, between 0 and 100") \
2246 range(0, 100) \
2247 \
2248 product(uintx, AdaptiveTimeWeight, 25, \
2249 "Weight given to time in adaptive policy, between 0 and 100") \
2250 range(0, 100) \
2251 \
2252 product(uintx, PausePadding, 1, \
2253 "How much buffer to keep for pause time") \
2254 \
2255 product(uintx, PromotedPadding, 3, \
2256 "How much buffer to keep for promotion failure") \
2257 \
2258 product(uintx, SurvivorPadding, 3, \
2259 "How much buffer to keep for survivor overflow") \
2260 \
2261 product(uintx, ThresholdTolerance, 10, \
2262 "Allowed collection cost difference between generations") \
2263 range(0, 100) \
2264 \
2265 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2266 "If collection costs are within margin, reduce both by full " \
2267 "delta") \
2268 \
2269 product(uintx, YoungGenerationSizeIncrement, 20, \
2270 "Adaptive size percentage change in young generation") \
2271 range(0, 100) \
2272 \
2273 product(uintx, YoungGenerationSizeSupplement, 80, \
2274 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2275 range(0, 100) \
2276 \
2277 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2278 "Decay factor to YoungedGenerationSizeSupplement") \
2279 range(1, max_uintx) \
2280 \
2281 product(uintx, TenuredGenerationSizeIncrement, 20, \
2282 "Adaptive size percentage change in tenured generation") \
2283 range(0, 100) \
2284 \
2285 product(uintx, TenuredGenerationSizeSupplement, 80, \
2286 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2287 range(0, 100) \
2288 \
2289 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2290 "Decay factor to TenuredGenerationSizeIncrement") \
2291 range(1, max_uintx) \
2292 \
2293 product(uintx, MaxGCPauseMillis, max_uintx, \
2294 "Adaptive size policy maximum GC pause time goal in millisecond, "\
2295 "or (G1 Only) the maximum GC time per MMU time slice") \
2296 \
2297 product(uintx, GCPauseIntervalMillis, 0, \
2298 "Time slice for MMU specification") \
2299 \
2300 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2301 "Adaptive size policy maximum GC minor pause time goal " \
2302 "in millisecond") \
2303 \
2304 product(uintx, GCTimeRatio, 99, \
2305 "Adaptive size policy application time to GC time ratio") \
2306 \
2307 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2308 "Adaptive size scale down factor for shrinking") \
2309 range(1, max_uintx) \
2310 \
2311 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2312 "Adaptive size decays the major cost for long major intervals") \
2313 \
2314 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2315 "Time scale over which major costs decay") \
2316 \
2317 product(uintx, MinSurvivorRatio, 3, \
2318 "Minimum ratio of young generation/survivor space size") \
2319 \
2320 product(uintx, InitialSurvivorRatio, 8, \
2321 "Initial ratio of young generation/survivor space size") \
2322 \
2323 product(size_t, BaseFootPrintEstimate, 256*M, \
2324 "Estimate of footprint other than Java Heap") \
2325 \
2326 product(bool, UseGCOverheadLimit, true, \
2327 "Use policy to limit of proportion of time spent in GC " \
2328 "before an OutOfMemory error is thrown") \
2329 \
2330 product(uintx, GCTimeLimit, 98, \
2331 "Limit of the proportion of time spent in GC before " \
2332 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
2333 range(0, 100) \
2334 \
2335 product(uintx, GCHeapFreeLimit, 2, \
2336 "Minimum percentage of free space after a full GC before an " \
2337 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2338 range(0, 100) \
2339 \
2340 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2341 "Number of consecutive collections before gc time limit fires") \
2342 \
2343 product(bool, PrintAdaptiveSizePolicy, false, \
2344 "Print information about AdaptiveSizePolicy") \
2345 \
2346 product(intx, PrefetchCopyIntervalInBytes, -1, \
2347 "How far ahead to prefetch destination area (<= 0 means off)") \
2348 \
2349 product(intx, PrefetchScanIntervalInBytes, -1, \
2350 "How far ahead to prefetch scan area (<= 0 means off)") \
2351 \
2352 product(intx, PrefetchFieldsAhead, -1, \
2353 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2354 \
2355 diagnostic(bool, VerifySilently, false, \
2356 "Do not print the verification progress") \
2357 \
2358 diagnostic(bool, VerifyDuringStartup, false, \
2359 "Verify memory system before executing any Java code " \
2360 "during VM initialization") \
2361 \
2362 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2363 "Verify system before exiting") \
2364 \
2365 diagnostic(bool, VerifyBeforeGC, false, \
2366 "Verify memory system before GC") \
2367 \
2368 diagnostic(bool, VerifyAfterGC, false, \
2369 "Verify memory system after GC") \
2370 \
2371 diagnostic(bool, VerifyDuringGC, false, \
2372 "Verify memory system during GC (between phases)") \
2373 \
2374 diagnostic(bool, GCParallelVerificationEnabled, true, \
2375 "Enable parallel memory system verification") \
2376 \
2377 diagnostic(bool, DeferInitialCardMark, false, \
2378 "When +ReduceInitialCardMarks, explicitly defer any that " \
2379 "may arise from new_pre_store_barrier") \
2380 \
2381 product(bool, UseCondCardMark, false, \
2382 "Check for already marked card before updating card table") \
2383 \
2384 diagnostic(bool, VerifyRememberedSets, false, \
2385 "Verify GC remembered sets") \
2386 \
2387 diagnostic(bool, VerifyObjectStartArray, true, \
2388 "Verify GC object start array if verify before/after") \
2389 \
2390 product(bool, DisableExplicitGC, false, \
2391 "Ignore calls to System.gc()") \
2392 \
2393 notproduct(bool, CheckMemoryInitialization, false, \
2394 "Check memory initialization") \
2395 \
2396 diagnostic(bool, BindCMSThreadToCPU, false, \
2397 "Bind CMS Thread to CPU if possible") \
2398 \
2399 diagnostic(uintx, CPUForCMSThread, 0, \
2400 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2401 \
2402 product(bool, BindGCTaskThreadsToCPUs, false, \
2403 "Bind GCTaskThreads to CPUs if possible") \
2404 \
2405 product(bool, UseGCTaskAffinity, false, \
2406 "Use worker affinity when asking for GCTasks") \
2407 \
2408 product(uintx, ProcessDistributionStride, 4, \
2409 "Stride through processors when distributing processes") \
2410 \
2411 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2412 "Number of times the coordinator GC thread will sleep while " \
2413 "yielding before giving up and resuming GC") \
2414 \
2415 product(uintx, CMSYieldSleepCount, 0, \
2416 "Number of times a GC thread (minus the coordinator) " \
2417 "will sleep while yielding before giving up and resuming GC") \
2418 \
2419 /* gc tracing */ \
2420 manageable(bool, PrintGC, false, \
2421 "Print message at garbage collection") \
2422 \
2423 manageable(bool, PrintGCDetails, false, \
2424 "Print more details at garbage collection") \
2425 \
2426 manageable(bool, PrintGCDateStamps, false, \
2427 "Print date stamps at garbage collection") \
2428 \
2429 manageable(bool, PrintGCTimeStamps, false, \
2430 "Print timestamps at garbage collection") \
2431 \
2432 manageable(bool, PrintGCID, true, \
2433 "Print an identifier for each garbage collection") \
2434 \
2435 product(bool, PrintGCTaskTimeStamps, false, \
2436 "Print timestamps for individual gc worker thread tasks") \
2437 \
2438 develop(intx, ConcGCYieldTimeout, 0, \
2439 "If non-zero, assert that GC threads yield within this " \
2440 "number of milliseconds") \
2441 \
2442 product(bool, PrintReferenceGC, false, \
2443 "Print times spent handling reference objects during GC " \
2444 "(enabled only when PrintGCDetails)") \
2445 \
2446 develop(bool, TraceReferenceGC, false, \
2447 "Trace handling of soft/weak/final/phantom references") \
2448 \
2449 develop(bool, TraceFinalizerRegistration, false, \
2450 "Trace registration of final references") \
2451 \
2452 notproduct(bool, TraceScavenge, false, \
2453 "Trace scavenge") \
2454 \
2455 product(bool, IgnoreEmptyClassPaths, false, \
2456 "Ignore empty path elements in -classpath") \
2457 \
2458 product(bool, TraceClassPaths, false, \
2459 "Trace processing of class paths") \
2460 \
2461 product_rw(bool, TraceClassLoading, false, \
2462 "Trace all classes loaded") \
2463 \
2464 product(bool, TraceClassLoadingPreorder, false, \
2465 "Trace all classes loaded in order referenced (not loaded)") \
2466 \
2467 product_rw(bool, TraceClassUnloading, false, \
2468 "Trace unloading of classes") \
2469 \
2470 product_rw(bool, TraceLoaderConstraints, false, \
2471 "Trace loader constraints") \
2472 \
2473 develop(bool, TraceClassLoaderData, false, \
2474 "Trace class loader loader_data lifetime") \
2475 \
2476 product(size_t, InitialBootClassLoaderMetaspaceSize, \
2477 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2478 "Initial size of the boot class loader data metaspace") \
2479 \
2480 product(bool, TraceYoungGenTime, false, \
2481 "Trace accumulated time for young collection") \
2482 \
2483 product(bool, TraceOldGenTime, false, \
2484 "Trace accumulated time for old collection") \
2485 \
2486 product(bool, PrintTenuringDistribution, false, \
2487 "Print tenuring age information") \
2488 \
2489 product_rw(bool, PrintHeapAtGC, false, \
2490 "Print heap layout before and after each GC") \
2491 \
2492 product_rw(bool, PrintHeapAtGCExtended, false, \
2493 "Print extended information about the layout of the heap " \
2494 "when -XX:+PrintHeapAtGC is set") \
2495 \
2496 product(bool, PrintHeapAtSIGBREAK, true, \
2497 "Print heap layout in response to SIGBREAK") \
2498 \
2499 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2500 "Print a class histogram before any major stop-world GC") \
2501 \
2502 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2503 "Print a class histogram after any major stop-world GC") \
2504 \
2505 manageable(bool, PrintClassHistogram, false, \
2506 "Print a histogram of class instances") \
2507 \
2508 develop(bool, TraceWorkGang, false, \
2509 "Trace activities of work gangs") \
2510 \
2511 product(bool, TraceParallelOldGCTasks, false, \
2512 "Trace multithreaded GC activity") \
2513 \
2514 develop(bool, TraceBlockOffsetTable, false, \
2515 "Print BlockOffsetTable maps") \
2516 \
2517 develop(bool, TraceCardTableModRefBS, false, \
2518 "Print CardTableModRefBS maps") \
2519 \
2520 develop(bool, TraceGCTaskManager, false, \
2521 "Trace actions of the GC task manager") \
2522 \
2523 develop(bool, TraceGCTaskQueue, false, \
2524 "Trace actions of the GC task queues") \
2525 \
2526 diagnostic(bool, TraceGCTaskThread, false, \
2527 "Trace actions of the GC task threads") \
2528 \
2529 product(bool, PrintParallelOldGCPhaseTimes, false, \
2530 "Print the time taken by each phase in ParallelOldGC " \
2531 "(PrintGCDetails must also be enabled)") \
2532 \
2533 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2534 "Trace marking phase in ParallelOldGC") \
2535 \
2536 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2537 "Trace summary phase in ParallelOldGC") \
2538 \
2539 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2540 "Trace compaction phase in ParallelOldGC") \
2541 \
2542 develop(bool, TraceParallelOldGCDensePrefix, false, \
2543 "Trace dense prefix computation for ParallelOldGC") \
2544 \
2545 develop(bool, IgnoreLibthreadGPFault, false, \
2546 "Suppress workaround for libthread GP fault") \
2547 \
2548 product(bool, PrintJNIGCStalls, false, \
2549 "Print diagnostic message when GC is stalled " \
2550 "by JNI critical section") \
2551 \
2552 experimental(double, ObjectCountCutOffPercent, 0.5, \
2553 "The percentage of the used heap that the instances of a class " \
2554 "must occupy for the class to generate a trace event") \
2555 \
2556 /* GC log rotation setting */ \
2557 \
2558 product(bool, UseGCLogFileRotation, false, \
2559 "Rotate gclog files (for long running applications). It requires "\
2560 "-Xloggc:<filename>") \
2561 \
2562 product(uintx, NumberOfGCLogFiles, 0, \
2563 "Number of gclog files in rotation " \
2564 "(default: 0, no rotation)") \
2565 \
2566 product(size_t, GCLogFileSize, 8*K, \
2567 "GC log file size, requires UseGCLogFileRotation. " \
2568 "Set to 0 to only trigger rotation via jcmd") \
2569 \
2570 /* JVMTI heap profiling */ \
2571 \
2572 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2573 "Trace JVMTI object tagging calls") \
2574 \
2575 diagnostic(bool, VerifyBeforeIteration, false, \
2576 "Verify memory system before JVMTI iteration") \
2577 \
2578 /* compiler interface */ \
2579 \
2580 develop(bool, CIPrintCompilerName, false, \
2581 "when CIPrint is active, print the name of the active compiler") \
2582 \
2583 diagnostic(bool, CIPrintCompileQueue, false, \
2584 "display the contents of the compile queue whenever a " \
2585 "compilation is enqueued") \
2586 \
2587 develop(bool, CIPrintRequests, false, \
2588 "display every request for compilation") \
2589 \
2590 product(bool, CITime, false, \
2591 "collect timing information for compilation") \
2592 \
2593 develop(bool, CITimeVerbose, false, \
2594 "be more verbose in compilation timings") \
2595 \
2596 develop(bool, CITimeEach, false, \
2597 "display timing information after each successful compilation") \
2598 \
2599 develop(bool, CICountOSR, false, \
2600 "use a separate counter when assigning ids to osr compilations") \
2601 \
2602 develop(bool, CICompileNatives, true, \
2603 "compile native methods if supported by the compiler") \
2604 \
2605 develop_pd(bool, CICompileOSR, \
2606 "compile on stack replacement methods if supported by the " \
2607 "compiler") \
2608 \
2609 develop(bool, CIPrintMethodCodes, false, \
2610 "print method bytecodes of the compiled code") \
2611 \
2612 develop(bool, CIPrintTypeFlow, false, \
2613 "print the results of ciTypeFlow analysis") \
2614 \
2615 develop(bool, CITraceTypeFlow, false, \
2616 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2617 \
2618 develop(intx, OSROnlyBCI, -1, \
2619 "OSR only at this bci. Negative values mean exclude that bci") \
2620 \
2621 /* compiler */ \
2622 \
2623 /* notice: the max range value here is max_jint, not max_intx */ \
2624 /* because of overflow issue */ \
2625 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2626 "Number of compiler threads to run") \
2627 range(0, max_jint) \
2628 constraint(CICompilerCountConstraintFunc, AtParse) \
2629 \
2630 product(intx, CompilationPolicyChoice, 0, \
2631 "which compilation policy (0-3)") \
2632 range(0, 3) \
2633 \
2634 develop(bool, UseStackBanging, true, \
2635 "use stack banging for stack overflow checks (required for " \
2636 "proper StackOverflow handling; disable only to measure cost " \
2637 "of stackbanging)") \
2638 \
2639 develop(bool, UseStrictFP, true, \
2640 "use strict fp if modifier strictfp is set") \
2641 \
2642 develop(bool, GenerateSynchronizationCode, true, \
2643 "generate locking/unlocking code for synchronized methods and " \
2644 "monitors") \
2645 \
2646 develop(bool, GenerateCompilerNullChecks, true, \
2647 "Generate explicit null checks for loads/stores/calls") \
2648 \
2649 develop(bool, GenerateRangeChecks, true, \
2650 "Generate range checks for array accesses") \
2651 \
2652 develop_pd(bool, ImplicitNullChecks, \
2653 "Generate code for implicit null checks") \
2654 \
2655 product_pd(bool, TrapBasedNullChecks, \
2656 "Generate code for null checks that uses a cmp and trap " \
2657 "instruction raising SIGTRAP. This is only used if an access to" \
2658 "null (+offset) will not raise a SIGSEGV, i.e.," \
2659 "ImplicitNullChecks don't work (PPC64).") \
2660 \
2661 product(bool, PrintSafepointStatistics, false, \
2662 "Print statistics about safepoint synchronization") \
2663 \
2664 product(intx, PrintSafepointStatisticsCount, 300, \
2665 "Total number of safepoint statistics collected " \
2666 "before printing them out") \
2667 \
2668 product(intx, PrintSafepointStatisticsTimeout, -1, \
2669 "Print safepoint statistics only when safepoint takes " \
2670 "more than PrintSafepointSatisticsTimeout in millis") \
2671 \
2672 product(bool, TraceSafepointCleanupTime, false, \
2673 "Print the break down of clean up tasks performed during " \
2674 "safepoint") \
2675 \
2676 product(bool, Inline, true, \
2677 "Enable inlining") \
2678 \
2679 product(bool, ClipInlining, true, \
2680 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
2681 \
2682 develop(bool, UseCHA, true, \
2683 "Enable CHA") \
2684 \
2685 product(bool, UseTypeProfile, true, \
2686 "Check interpreter profile for historically monomorphic calls") \
2687 \
2688 diagnostic(bool, PrintInlining, false, \
2689 "Print inlining optimizations") \
2690 \
2691 product(bool, UsePopCountInstruction, false, \
2692 "Use population count instruction") \
2693 \
2694 develop(bool, EagerInitialization, false, \
2695 "Eagerly initialize classes if possible") \
2696 \
2697 diagnostic(bool, LogTouchedMethods, false, \
2698 "Log methods which have been ever touched in runtime") \
2699 \
2700 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
2701 "Print all methods that have been ever touched in runtime") \
2702 \
2703 develop(bool, TraceMethodReplacement, false, \
2704 "Print when methods are replaced do to recompilation") \
2705 \
2706 develop(bool, PrintMethodFlushing, false, \
2707 "Print the nmethods being flushed") \
2708 \
2709 diagnostic(bool, PrintMethodFlushingStatistics, false, \
2710 "print statistics about method flushing") \
2711 \
2712 diagnostic(intx, HotMethodDetectionLimit, 100000, \
2713 "Number of compiled code invocations after which " \
2714 "the method is considered as hot by the flusher") \
2715 \
2716 diagnostic(intx, MinPassesBeforeFlush, 10, \
2717 "Minimum number of sweeper passes before an nmethod " \
2718 "can be flushed") \
2719 \
2720 product(bool, UseCodeAging, true, \
2721 "Insert counter to detect warm methods") \
2722 \
2723 diagnostic(bool, StressCodeAging, false, \
2724 "Start with counters compiled in") \
2725 \
2726 develop(bool, UseRelocIndex, false, \
2727 "Use an index to speed random access to relocations") \
2728 \
2729 develop(bool, StressCodeBuffers, false, \
2730 "Exercise code buffer expansion and other rare state changes") \
2731 \
2732 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2733 "Generate extra debugging information for non-safepoints in " \
2734 "nmethods") \
2735 \
2736 product(bool, PrintVMOptions, false, \
2737 "Print flags that appeared on the command line") \
2738 \
2739 product(bool, IgnoreUnrecognizedVMOptions, false, \
2740 "Ignore unrecognized VM options") \
2741 \
2742 product(bool, PrintCommandLineFlags, false, \
2743 "Print flags specified on command line or set by ergonomics") \
2744 \
2745 product(bool, PrintFlagsInitial, false, \
2746 "Print all VM flags before argument processing and exit VM") \
2747 \
2748 product(bool, PrintFlagsFinal, false, \
2749 "Print all VM flags after argument and ergonomic processing") \
2750 \
2751 notproduct(bool, PrintFlagsWithComments, false, \
2752 "Print all VM flags with default values and descriptions and " \
2753 "exit") \
2754 \
2755 product(bool, PrintFlagsRanges, false, \
2756 "Print VM flags and their ranges and exit VM") \
2757 \
2758 diagnostic(bool, SerializeVMOutput, true, \
2759 "Use a mutex to serialize output to tty and LogFile") \
2760 \
2761 diagnostic(bool, DisplayVMOutput, true, \
2762 "Display all VM output on the tty, independently of LogVMOutput") \
2763 \
2764 diagnostic(bool, LogVMOutput, false, \
2765 "Save VM output to LogFile") \
2766 \
2767 diagnostic(ccstr, LogFile, NULL, \
2768 "If LogVMOutput or LogCompilation is on, save VM output to " \
2769 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2770 \
2771 product(ccstr, ErrorFile, NULL, \
2772 "If an error occurs, save the error data to this file " \
2773 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2774 \
2775 product(bool, DisplayVMOutputToStderr, false, \
2776 "If DisplayVMOutput is true, display all VM output to stderr") \
2777 \
2778 product(bool, DisplayVMOutputToStdout, false, \
2779 "If DisplayVMOutput is true, display all VM output to stdout") \
2780 \
2781 product(bool, UseHeavyMonitors, false, \
2782 "use heavyweight instead of lightweight Java monitors") \
2783 \
2784 product(bool, PrintStringTableStatistics, false, \
2785 "print statistics about the StringTable and SymbolTable") \
2786 \
2787 diagnostic(bool, VerifyStringTableAtExit, false, \
2788 "verify StringTable contents at exit") \
2789 \
2790 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2791 "print histogram of the symbol table") \
2792 \
2793 notproduct(bool, ExitVMOnVerifyError, false, \
2794 "standard exit from VM if bytecode verify error " \
2795 "(only in debug mode)") \
2796 \
2797 notproduct(ccstr, AbortVMOnException, NULL, \
2798 "Call fatal if this exception is thrown. Example: " \
2799 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2800 \
2801 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2802 "Call fatal if the exception pointed by AbortVMOnException " \
2803 "has this message") \
2804 \
2805 develop(bool, DebugVtables, false, \
2806 "add debugging code to vtable dispatch") \
2807 \
2808 develop(bool, PrintVtables, false, \
2809 "print vtables when printing klass") \
2810 \
2811 notproduct(bool, PrintVtableStats, false, \
2812 "print vtables stats at end of run") \
2813 \
2814 develop(bool, TraceCreateZombies, false, \
2815 "trace creation of zombie nmethods") \
2816 \
2817 notproduct(bool, IgnoreLockingAssertions, false, \
2818 "disable locking assertions (for speed)") \
2819 \
2820 product(bool, RangeCheckElimination, true, \
2821 "Eliminate range checks") \
2822 \
2823 develop_pd(bool, UncommonNullCast, \
2824 "track occurrences of null in casts; adjust compiler tactics") \
2825 \
2826 develop(bool, TypeProfileCasts, true, \
2827 "treat casts like calls for purposes of type profiling") \
2828 \
2829 develop(bool, DelayCompilationDuringStartup, true, \
2830 "Delay invoking the compiler until main application class is " \
2831 "loaded") \
2832 \
2833 develop(bool, CompileTheWorld, false, \
2834 "Compile all methods in all classes in bootstrap class path " \
2835 "(stress test)") \
2836 \
2837 develop(bool, CompileTheWorldPreloadClasses, true, \
2838 "Preload all classes used by a class before start loading") \
2839 \
2840 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2841 "Force a safepoint every n compiles so sweeper can keep up") \
2842 \
2843 develop(bool, FillDelaySlots, true, \
2844 "Fill delay slots (on SPARC only)") \
2845 \
2846 develop(bool, TimeLivenessAnalysis, false, \
2847 "Time computation of bytecode liveness analysis") \
2848 \
2849 develop(bool, TraceLivenessGen, false, \
2850 "Trace the generation of liveness analysis information") \
2851 \
2852 notproduct(bool, TraceLivenessQuery, false, \
2853 "Trace queries of liveness analysis information") \
2854 \
2855 notproduct(bool, CollectIndexSetStatistics, false, \
2856 "Collect information about IndexSets") \
2857 \
2858 develop(bool, UseLoopSafepoints, true, \
2859 "Generate Safepoint nodes in every loop") \
2860 \
2861 develop(intx, FastAllocateSizeLimit, 128*K, \
2862 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2863 "Inline allocations larger than this in doublewords must go slow")\
2864 \
2865 product(bool, AggressiveOpts, false, \
2866 "Enable aggressive optimizations - see arguments.cpp") \
2867 \
2868 product_pd(uintx, TypeProfileLevel, \
2869 "=XYZ, with Z: Type profiling of arguments at call; " \
2870 "Y: Type profiling of return value at call; " \
2871 "X: Type profiling of parameters to methods; " \
2872 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
2873 \
2874 product(intx, TypeProfileArgsLimit, 2, \
2875 "max number of call arguments to consider for type profiling") \
2876 \
2877 product(intx, TypeProfileParmsLimit, 2, \
2878 "max number of incoming parameters to consider for type profiling"\
2879 ", -1 for all") \
2880 \
2881 /* statistics */ \
2882 develop(bool, CountCompiledCalls, false, \
2883 "Count method invocations") \
2884 \
2885 notproduct(bool, CountRuntimeCalls, false, \
2886 "Count VM runtime calls") \
2887 \
2888 develop(bool, CountJNICalls, false, \
2889 "Count jni method invocations") \
2890 \
2891 notproduct(bool, CountJVMCalls, false, \
2892 "Count jvm method invocations") \
2893 \
2894 notproduct(bool, CountRemovableExceptions, false, \
2895 "Count exceptions that could be replaced by branches due to " \
2896 "inlining") \
2897 \
2898 notproduct(bool, ICMissHistogram, false, \
2899 "Produce histogram of IC misses") \
2900 \
2901 /* interpreter */ \
2902 develop(bool, ClearInterpreterLocals, false, \
2903 "Always clear local variables of interpreter activations upon " \
2904 "entry") \
2905 \
2906 product_pd(bool, RewriteBytecodes, \
2907 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2908 \
2909 product_pd(bool, RewriteFrequentPairs, \
2910 "Rewrite frequently used bytecode pairs into a single bytecode") \
2911 \
2912 diagnostic(bool, PrintInterpreter, false, \
2913 "Print the generated interpreter code") \
2914 \
2915 product(bool, UseInterpreter, true, \
2916 "Use interpreter for non-compiled methods") \
2917 \
2918 develop(bool, UseFastSignatureHandlers, true, \
2919 "Use fast signature handlers for native calls") \
2920 \
2921 product(bool, UseLoopCounter, true, \
2922 "Increment invocation counter on backward branch") \
2923 \
2924 product_pd(bool, UseOnStackReplacement, \
2925 "Use on stack replacement, calls runtime if invoc. counter " \
2926 "overflows in loop") \
2927 \
2928 notproduct(bool, TraceOnStackReplacement, false, \
2929 "Trace on stack replacement") \
2930 \
2931 product_pd(bool, PreferInterpreterNativeStubs, \
2932 "Use always interpreter stubs for native methods invoked via " \
2933 "interpreter") \
2934 \
2935 develop(bool, CountBytecodes, false, \
2936 "Count number of bytecodes executed") \
2937 \
2938 develop(bool, PrintBytecodeHistogram, false, \
2939 "Print histogram of the executed bytecodes") \
2940 \
2941 develop(bool, PrintBytecodePairHistogram, false, \
2942 "Print histogram of the executed bytecode pairs") \
2943 \
2944 diagnostic(bool, PrintSignatureHandlers, false, \
2945 "Print code generated for native method signature handlers") \
2946 \
2947 develop(bool, VerifyOops, false, \
2948 "Do plausibility checks for oops") \
2949 \
2950 develop(bool, CheckUnhandledOops, false, \
2951 "Check for unhandled oops in VM code") \
2952 \
2953 develop(bool, VerifyJNIFields, trueInDebug, \
2954 "Verify jfieldIDs for instance fields") \
2955 \
2956 notproduct(bool, VerifyJNIEnvThread, false, \
2957 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2958 "from JNI") \
2959 \
2960 develop(bool, VerifyFPU, false, \
2961 "Verify FPU state (check for NaN's, etc.)") \
2962 \
2963 develop(bool, VerifyThread, false, \
2964 "Watch the thread register for corruption (SPARC only)") \
2965 \
2966 develop(bool, VerifyActivationFrameSize, false, \
2967 "Verify that activation frame didn't become smaller than its " \
2968 "minimal size") \
2969 \
2970 develop(bool, TraceFrequencyInlining, false, \
2971 "Trace frequency based inlining") \
2972 \
2973 develop_pd(bool, InlineIntrinsics, \
2974 "Inline intrinsics that can be statically resolved") \
2975 \
2976 product_pd(bool, ProfileInterpreter, \
2977 "Profile at the bytecode level during interpretation") \
2978 \
2979 develop(bool, TraceProfileInterpreter, false, \
2980 "Trace profiling at the bytecode level during interpretation. " \
2981 "This outputs the profiling information collected to improve " \
2982 "jit compilation.") \
2983 \
2984 develop_pd(bool, ProfileTraps, \
2985 "Profile deoptimization traps at the bytecode level") \
2986 \
2987 product(intx, ProfileMaturityPercentage, 20, \
2988 "number of method invocations/branches (expressed as % of " \
2989 "CompileThreshold) before using the method's profile") \
2990 range(0, 100) \
2991 \
2992 diagnostic(bool, PrintMethodData, false, \
2993 "Print the results of +ProfileInterpreter at end of run") \
2994 \
2995 develop(bool, VerifyDataPointer, trueInDebug, \
2996 "Verify the method data pointer during interpreter profiling") \
2997 \
2998 develop(bool, VerifyCompiledCode, false, \
2999 "Include miscellaneous runtime verifications in nmethod code; " \
3000 "default off because it disturbs nmethod size heuristics") \
3001 \
3002 notproduct(bool, CrashGCForDumpingJavaThread, false, \
3003 "Manually make GC thread crash then dump java stack trace; " \
3004 "Test only") \
3005 \
3006 /* compilation */ \
3007 product(bool, UseCompiler, true, \
3008 "Use Just-In-Time compilation") \
3009 \
3010 develop(bool, TraceCompilationPolicy, false, \
3011 "Trace compilation policy") \
3012 \
3013 develop(bool, TimeCompilationPolicy, false, \
3014 "Time the compilation policy") \
3015 \
3016 product(bool, UseCounterDecay, true, \
3017 "Adjust recompilation counters") \
3018 \
3019 develop(intx, CounterHalfLifeTime, 30, \
3020 "Half-life time of invocation counters (in seconds)") \
3021 \
3022 develop(intx, CounterDecayMinIntervalLength, 500, \
3023 "The minimum interval (in milliseconds) between invocation of " \
3024 "CounterDecay") \
3025 \
3026 product(bool, AlwaysCompileLoopMethods, false, \
3027 "When using recompilation, never interpret methods " \
3028 "containing loops") \
3029 \
3030 product(bool, DontCompileHugeMethods, true, \
3031 "Do not compile methods > HugeMethodLimit") \
3032 \
3033 /* Bytecode escape analysis estimation. */ \
3034 product(bool, EstimateArgEscape, true, \
3035 "Analyze bytecodes to estimate escape state of arguments") \
3036 \
3037 product(intx, BCEATraceLevel, 0, \
3038 "How much tracing to do of bytecode escape analysis estimates") \
3039 \
3040 product(intx, MaxBCEAEstimateLevel, 5, \
3041 "Maximum number of nested calls that are analyzed by BC EA") \
3042 \
3043 product(intx, MaxBCEAEstimateSize, 150, \
3044 "Maximum bytecode size of a method to be analyzed by BC EA") \
3045 \
3046 product(intx, AllocatePrefetchStyle, 1, \
3047 "0 = no prefetch, " \
3048 "1 = prefetch instructions for each allocation, " \
3049 "2 = use TLAB watermark to gate allocation prefetch, " \
3050 "3 = use BIS instruction on Sparc for allocation prefetch") \
3051 range(0, 3) \
3052 \
3053 product(intx, AllocatePrefetchDistance, -1, \
3054 "Distance to prefetch ahead of allocation pointer") \
3055 \
3056 product(intx, AllocatePrefetchLines, 3, \
3057 "Number of lines to prefetch ahead of array allocation pointer") \
3058 \
3059 product(intx, AllocateInstancePrefetchLines, 1, \
3060 "Number of lines to prefetch ahead of instance allocation " \
3061 "pointer") \
3062 \
3063 product(intx, AllocatePrefetchStepSize, 16, \
3064 "Step size in bytes of sequential prefetch instructions") \
3065 \
3066 product(intx, AllocatePrefetchInstr, 0, \
3067 "Prefetch instruction to prefetch ahead of allocation pointer") \
3068 \
3069 /* deoptimization */ \
3070 develop(bool, TraceDeoptimization, false, \
3071 "Trace deoptimization") \
3072 \
3073 develop(bool, PrintDeoptimizationDetails, false, \
3074 "Print more information about deoptimization") \
3075 \
3076 develop(bool, DebugDeoptimization, false, \
3077 "Tracing various information while debugging deoptimization") \
3078 \
3079 product(intx, SelfDestructTimer, 0, \
3080 "Will cause VM to terminate after a given time (in minutes) " \
3081 "(0 means off)") \
3082 \
3083 product(intx, MaxJavaStackTraceDepth, 1024, \
3084 "The maximum number of lines in the stack trace for Java " \
3085 "exceptions (0 means all)") \
3086 \
3087 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
3088 "Guarantee a safepoint (at least) every so many milliseconds " \
3089 "(0 means none)")) \
3090 \
3091 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
3092 "Guarantee a safepoint (at least) every so many milliseconds " \
3093 "(0 means none)")) \
3094 \
3095 product(intx, SafepointTimeoutDelay, 10000, \
3096 "Delay in milliseconds for option SafepointTimeout") \
3097 \
3098 product(intx, NmethodSweepActivity, 10, \
3099 "Removes cold nmethods from code cache if > 0. Higher values " \
3100 "result in more aggressive sweeping") \
3101 range(0, 2000) \
3102 \
3103 notproduct(bool, LogSweeper, false, \
3104 "Keep a ring buffer of sweeper activity") \
3105 \
3106 notproduct(intx, SweeperLogEntries, 1024, \
3107 "Number of records in the ring buffer of sweeper activity") \
3108 \
3109 notproduct(intx, MemProfilingInterval, 500, \
3110 "Time between each invocation of the MemProfiler") \
3111 \
3112 develop(intx, MallocCatchPtr, -1, \
3113 "Hit breakpoint when mallocing/freeing this pointer") \
3114 \
3115 notproduct(ccstrlist, SuppressErrorAt, "", \
3116 "List of assertions (file:line) to muzzle") \
3117 \
3118 notproduct(size_t, HandleAllocationLimit, 1024, \
3119 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3120 "is used") \
3121 \
3122 develop(size_t, TotalHandleAllocationLimit, 1024, \
3123 "Threshold for total handle allocation when " \
3124 "+TraceHandleAllocation is used") \
3125 \
3126 develop(intx, StackPrintLimit, 100, \
3127 "number of stack frames to print in VM-level stack dump") \
3128 \
3129 notproduct(intx, MaxElementPrintSize, 256, \
3130 "maximum number of elements to print") \
3131 \
3132 notproduct(intx, MaxSubklassPrintSize, 4, \
3133 "maximum number of subklasses to print when printing klass") \
3134 \
3135 product(intx, MaxInlineLevel, 9, \
3136 "maximum number of nested calls that are inlined") \
3137 \
3138 product(intx, MaxRecursiveInlineLevel, 1, \
3139 "maximum number of nested recursive calls that are inlined") \
3140 \
3141 develop(intx, MaxForceInlineLevel, 100, \
3142 "maximum number of nested calls that are forced for inlining " \
3143 "(using CompileCommand or marked w/ @ForceInline)") \
3144 \
3145 product_pd(intx, InlineSmallCode, \
3146 "Only inline already compiled methods if their code size is " \
3147 "less than this") \
3148 \
3149 product(intx, MaxInlineSize, 35, \
3150 "The maximum bytecode size of a method to be inlined") \
3151 \
3152 product_pd(intx, FreqInlineSize, \
3153 "The maximum bytecode size of a frequent method to be inlined") \
3154 \
3155 product(intx, MaxTrivialSize, 6, \
3156 "The maximum bytecode size of a trivial method to be inlined") \
3157 \
3158 product(intx, MinInliningThreshold, 250, \
3159 "The minimum invocation count a method needs to have to be " \
3160 "inlined") \
3161 \
3162 develop(intx, MethodHistogramCutoff, 100, \
3163 "The cutoff value for method invocation histogram (+CountCalls)") \
3164 \
3165 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
3166 "Number of interpreted methods to show in profile") \
3167 \
3168 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
3169 "Number of compiled methods to show in profile") \
3170 \
3171 develop(intx, ProfilerNumberOfStubMethods, 25, \
3172 "Number of stub methods to show in profile") \
3173 \
3174 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
3175 "Number of runtime stub nodes to show in profile") \
3176 \
3177 product(intx, ProfileIntervalsTicks, 100, \
3178 "Number of ticks between printing of interval profile " \
3179 "(+ProfileIntervals)") \
3180 \
3181 notproduct(intx, ScavengeALotInterval, 1, \
3182 "Interval between which scavenge will occur with +ScavengeALot") \
3183 \
3184 notproduct(intx, FullGCALotInterval, 1, \
3185 "Interval between which full gc will occur with +FullGCALot") \
3186 \
3187 notproduct(intx, FullGCALotStart, 0, \
3188 "For which invocation to start FullGCAlot") \
3189 \
3190 notproduct(intx, FullGCALotDummies, 32*K, \
3191 "Dummy object allocated with +FullGCALot, forcing all objects " \
3192 "to move") \
3193 \
3194 develop(intx, DontYieldALotInterval, 10, \
3195 "Interval between which yields will be dropped (milliseconds)") \
3196 \
3197 develop(intx, MinSleepInterval, 1, \
3198 "Minimum sleep() interval (milliseconds) when " \
3199 "ConvertSleepToYield is off (used for Solaris)") \
3200 \
3201 develop(intx, ProfilerPCTickThreshold, 15, \
3202 "Number of ticks in a PC buckets to be a hotspot") \
3203 \
3204 notproduct(intx, DeoptimizeALotInterval, 5, \
3205 "Number of exits until DeoptimizeALot kicks in") \
3206 \
3207 notproduct(intx, ZombieALotInterval, 5, \
3208 "Number of exits until ZombieALot kicks in") \
3209 \
3210 diagnostic(intx, MallocVerifyInterval, 0, \
3211 "If non-zero, verify C heap after every N calls to " \
3212 "malloc/realloc/free") \
3213 \
3214 diagnostic(intx, MallocVerifyStart, 0, \
3215 "If non-zero, start verifying C heap after Nth call to " \
3216 "malloc/realloc/free") \
3217 \
3218 diagnostic(uintx, MallocMaxTestWords, 0, \
3219 "If non-zero, maximum number of words that malloc/realloc can " \
3220 "allocate (for testing only)") \
3221 \
3222 product(intx, TypeProfileWidth, 2, \
3223 "Number of receiver types to record in call/cast profile") \
3224 \
3225 experimental(intx, MethodProfileWidth, 0, \
3226 "Number of methods to record in call profile") \
3227 \
3228 develop(intx, BciProfileWidth, 2, \
3229 "Number of return bci's to record in ret profile") \
3230 \
3231 product(intx, PerMethodRecompilationCutoff, 400, \
3232 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3233 range(-1, max_intx) \
3234 \
3235 product(intx, PerBytecodeRecompilationCutoff, 200, \
3236 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3237 range(-1, max_intx) \
3238 \
3239 product(intx, PerMethodTrapLimit, 100, \
3240 "Limit on traps (of one kind) in a method (includes inlines)") \
3241 \
3242 experimental(intx, PerMethodSpecTrapLimit, 5000, \
3243 "Limit on speculative traps (of one kind) in a method " \
3244 "(includes inlines)") \
3245 \
3246 product(intx, PerBytecodeTrapLimit, 4, \
3247 "Limit on traps (of one kind) at a particular BCI") \
3248 \
3249 experimental(intx, SpecTrapLimitExtraEntries, 3, \
3250 "Extra method data trap entries for speculation") \
3251 \
3252 develop(intx, InlineFrequencyRatio, 20, \
3253 "Ratio of call site execution to caller method invocation") \
3254 \
3255 develop_pd(intx, InlineFrequencyCount, \
3256 "Count of call site execution necessary to trigger frequent " \
3257 "inlining") \
3258 \
3259 develop(intx, InlineThrowCount, 50, \
3260 "Force inlining of interpreted methods that throw this often") \
3261 \
3262 develop(intx, InlineThrowMaxSize, 200, \
3263 "Force inlining of throwing methods smaller than this") \
3264 \
3265 develop(intx, ProfilerNodeSize, 1024, \
3266 "Size in K to allocate for the Profile Nodes of each thread") \
3267 \
3268 /* gc parameters */ \
3269 product(size_t, InitialHeapSize, 0, \
3270 "Initial heap size (in bytes); zero means use ergonomics") \
3271 \
3272 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \
3273 "Maximum heap size (in bytes)") \
3274 \
3275 product(size_t, OldSize, ScaleForWordSize(4*M), \
3276 "Initial tenured generation size (in bytes)") \
3277 \
3278 product(size_t, NewSize, ScaleForWordSize(1*M), \
3279 "Initial new generation size (in bytes)") \
3280 \
3281 product(size_t, MaxNewSize, max_uintx, \
3282 "Maximum new generation size (in bytes), max_uintx means set " \
3283 "ergonomically") \
3284 \
3285 product(size_t, PretenureSizeThreshold, 0, \
3286 "Maximum size in bytes of objects allocated in DefNew " \
3287 "generation; zero means no maximum") \
3288 \
3289 product(size_t, TLABSize, 0, \
3290 "Starting TLAB size (in bytes); zero means set ergonomically") \
3291 \
3292 product(size_t, MinTLABSize, 2*K, \
3293 "Minimum allowed TLAB size (in bytes)") \
3294 range(1, max_uintx) \
3295 \
3296 product(uintx, TLABAllocationWeight, 35, \
3297 "Allocation averaging weight") \
3298 range(0, 100) \
3299 \
3300 /* Limit the lower bound of this flag to 1 as it is used */ \
3301 /* in a division expression. */ \
3302 product(uintx, TLABWasteTargetPercent, 1, \
3303 "Percentage of Eden that can be wasted") \
3304 range(1, 100) \
3305 \
3306 product(uintx, TLABRefillWasteFraction, 64, \
3307 "Maximum TLAB waste at a refill (internal fragmentation)") \
3308 range(1, max_uintx) \
3309 \
3310 product(uintx, TLABWasteIncrement, 4, \
3311 "Increment allowed waste at slow allocation") \
3312 \
3313 product(uintx, SurvivorRatio, 8, \
3314 "Ratio of eden/survivor space size") \
3315 \
3316 product(uintx, NewRatio, 2, \
3317 "Ratio of old/new generation sizes") \
3318 \
3319 product_pd(size_t, NewSizeThreadIncrease, \
3320 "Additional size added to desired new generation size per " \
3321 "non-daemon thread (in bytes)") \
3322 \
3323 product_pd(size_t, MetaspaceSize, \
3324 "Initial size of Metaspaces (in bytes)") \
3325 \
3326 product(size_t, MaxMetaspaceSize, max_uintx, \
3327 "Maximum size of Metaspaces (in bytes)") \
3328 \
3329 product(size_t, CompressedClassSpaceSize, 1*G, \
3330 "Maximum size of class area in Metaspace when compressed " \
3331 "class pointers are used") \
3332 range(1*M, 3*G) \
3333 \
3334 manageable(uintx, MinHeapFreeRatio, 40, \
3335 "The minimum percentage of heap free after GC to avoid expansion."\
3336 " For most GCs this applies to the old generation. In G1 and" \
3337 " ParallelGC it applies to the whole heap.") \
3338 range(0, 100) \
3339 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
3340 \
3341 manageable(uintx, MaxHeapFreeRatio, 70, \
3342 "The maximum percentage of heap free after GC to avoid shrinking."\
3343 " For most GCs this applies to the old generation. In G1 and" \
3344 " ParallelGC it applies to the whole heap.") \
3345 range(0, 100) \
3346 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
3347 \
3348 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3349 "Number of milliseconds per MB of free space in the heap") \
3350 \
3351 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3352 "The minimum change in heap space due to GC (in bytes)") \
3353 \
3354 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3355 "The minimum expansion of Metaspace (in bytes)") \
3356 \
3357 product(uintx, MaxMetaspaceFreeRatio, 70, \
3358 "The maximum percentage of Metaspace free after GC to avoid " \
3359 "shrinking") \
3360 range(0, 100) \
3361 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3362 \
3363 product(uintx, MinMetaspaceFreeRatio, 40, \
3364 "The minimum percentage of Metaspace free after GC to avoid " \
3365 "expansion") \
3366 range(0, 99) \
3367 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
3368 \
3369 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3370 "The maximum expansion of Metaspace without full GC (in bytes)") \
3371 \
3372 product(uintx, QueuedAllocationWarningCount, 0, \
3373 "Number of times an allocation that queues behind a GC " \
3374 "will retry before printing a warning") \
3375 \
3376 diagnostic(uintx, VerifyGCStartAt, 0, \
3377 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3378 \
3379 diagnostic(intx, VerifyGCLevel, 0, \
3380 "Generation level at which to start +VerifyBefore/AfterGC") \
3381 \
3382 product(uintx, MaxTenuringThreshold, 15, \
3383 "Maximum value for tenuring threshold") \
3384 range(0, markOopDesc::max_age + 1) \
3385 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \
3386 \
3387 product(uintx, InitialTenuringThreshold, 7, \
3388 "Initial value for tenuring threshold") \
3389 range(0, markOopDesc::max_age + 1) \
3390 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \
3391 \
3392 product(uintx, TargetSurvivorRatio, 50, \
3393 "Desired percentage of survivor space used after scavenge") \
3394 range(0, 100) \
3395 \
3396 product(uintx, MarkSweepDeadRatio, 5, \
3397 "Percentage (0-100) of the old gen allowed as dead wood. " \
3398 "Serial mark sweep treats this as both the minimum and maximum " \
3399 "value. " \
3400 "CMS uses this value only if it falls back to mark sweep. " \
3401 "Par compact uses a variable scale based on the density of the " \
3402 "generation and treats this as the maximum value when the heap " \
3403 "is either completely full or completely empty. Par compact " \
3404 "also has a smaller default value; see arguments.cpp.") \
3405 range(0, 100) \
3406 \
3407 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3408 "How often should we fully compact the heap (ignoring the dead " \
3409 "space parameters)") \
3410 range(1, max_uintx) \
3411 \
3412 product(intx, PrintCMSStatistics, 0, \
3413 "Statistics for CMS") \
3414 \
3415 product(bool, PrintCMSInitiationStatistics, false, \
3416 "Statistics for initiating a CMS collection") \
3417 \
3418 product(intx, PrintFLSStatistics, 0, \
3419 "Statistics for CMS' FreeListSpace") \
3420 \
3421 product(intx, PrintFLSCensus, 0, \
3422 "Census for CMS' FreeListSpace") \
3423 \
3424 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3425 "Delay between expansion and allocation (in milliseconds)") \
3426 \
3427 develop(uintx, GCWorkerDelayMillis, 0, \
3428 "Delay in scheduling GC workers (in milliseconds)") \
3429 \
3430 product(intx, DeferThrSuspendLoopCount, 4000, \
3431 "(Unstable) Number of times to iterate in safepoint loop " \
3432 "before blocking VM threads ") \
3433 \
3434 product(intx, DeferPollingPageLoopCount, -1, \
3435 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3436 "before changing safepoint polling page to RO ") \
3437 \
3438 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3439 \
3440 product(bool, PSChunkLargeArrays, true, \
3441 "Process large arrays in chunks") \
3442 \
3443 product(uintx, GCDrainStackTargetSize, 64, \
3444 "Number of entries we will try to leave on the stack " \
3445 "during parallel gc") \
3446 \
3447 /* stack parameters */ \
3448 product_pd(intx, StackYellowPages, \
3449 "Number of yellow zone (recoverable overflows) pages") \
3450 range(1, max_intx) \
3451 \
3452 product_pd(intx, StackRedPages, \
3453 "Number of red zone (unrecoverable overflows) pages") \
3454 range(1, max_intx) \
3455 \
3456 /* greater stack shadow pages can't generate instruction to bang stack */ \
3457 product_pd(intx, StackShadowPages, \
3458 "Number of shadow zone (for overflow checking) pages " \
3459 "this should exceed the depth of the VM and native call stack") \
3460 range(1, 50) \
3461 \
3462 product_pd(intx, ThreadStackSize, \
3463 "Thread Stack Size (in Kbytes)") \
3464 \
3465 product_pd(intx, VMThreadStackSize, \
3466 "Non-Java Thread Stack Size (in Kbytes)") \
3467 \
3468 product_pd(intx, CompilerThreadStackSize, \
3469 "Compiler Thread Stack Size (in Kbytes)") \
3470 \
3471 develop_pd(size_t, JVMInvokeMethodSlack, \
3472 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3473 \
3474 /* code cache parameters */ \
3475 /* ppc64/tiered compilation has large code-entry alignment. */ \
3476 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3477 "Code cache segment size (in bytes) - smallest unit of " \
3478 "allocation") \
3479 range(1, 1024) \
3480 \
3481 develop_pd(intx, CodeEntryAlignment, \
3482 "Code entry alignment for generated code (in bytes)") \
3483 \
3484 product_pd(intx, OptoLoopAlignment, \
3485 "Align inner loops to zero relative to this modulus") \
3486 \
3487 product_pd(uintx, InitialCodeCacheSize, \
3488 "Initial code cache size (in bytes)") \
3489 \
3490 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3491 "Minimum code cache size (in bytes) required to start VM.") \
3492 \
3493 product(bool, SegmentedCodeCache, false, \
3494 "Use a segmented code cache") \
3495 \
3496 product_pd(uintx, ReservedCodeCacheSize, \
3497 "Reserved code cache size (in bytes) - maximum code cache size") \
3498 \
3499 product_pd(uintx, NonProfiledCodeHeapSize, \
3500 "Size of code heap with non-profiled methods (in bytes)") \
3501 \
3502 product_pd(uintx, ProfiledCodeHeapSize, \
3503 "Size of code heap with profiled methods (in bytes)") \
3504 \
3505 product_pd(uintx, NonNMethodCodeHeapSize, \
3506 "Size of code heap with non-nmethods (in bytes)") \
3507 \
3508 product_pd(uintx, CodeCacheExpansionSize, \
3509 "Code cache expansion size (in bytes)") \
3510 \
3511 develop_pd(uintx, CodeCacheMinBlockLength, \
3512 "Minimum number of segments in a code cache block") \
3513 range(1, 100) \
3514 \
3515 notproduct(bool, ExitOnFullCodeCache, false, \
3516 "Exit the VM if we fill the code cache") \
3517 \
3518 product(bool, UseCodeCacheFlushing, true, \
3519 "Remove cold/old nmethods from the code cache") \
3520 \
3521 product(uintx, StartAggressiveSweepingAt, 10, \
3522 "Start aggressive sweeping if X[%] of the code cache is free." \
3523 "Segmented code cache: X[%] of the non-profiled heap." \
3524 "Non-segmented code cache: X[%] of the total code cache") \
3525 range(0, 100) \
3526 \
3527 /* interpreter debugging */ \
3528 develop(intx, BinarySwitchThreshold, 5, \
3529 "Minimal number of lookupswitch entries for rewriting to binary " \
3530 "switch") \
3531 \
3532 develop(intx, StopInterpreterAt, 0, \
3533 "Stop interpreter execution at specified bytecode number") \
3534 \
3535 develop(intx, TraceBytecodesAt, 0, \
3536 "Trace bytecodes starting with specified bytecode number") \
3537 \
3538 /* compiler interface */ \
3539 develop(intx, CIStart, 0, \
3540 "The id of the first compilation to permit") \
3541 \
3542 develop(intx, CIStop, max_jint, \
3543 "The id of the last compilation to permit") \
3544 \
3545 develop(intx, CIStartOSR, 0, \
3546 "The id of the first osr compilation to permit " \
3547 "(CICountOSR must be on)") \
3548 \
3549 develop(intx, CIStopOSR, max_jint, \
3550 "The id of the last osr compilation to permit " \
3551 "(CICountOSR must be on)") \
3552 \
3553 develop(intx, CIBreakAtOSR, -1, \
3554 "The id of osr compilation to break at") \
3555 \
3556 develop(intx, CIBreakAt, -1, \
3557 "The id of compilation to break at") \
3558 \
3559 product(ccstrlist, CompileOnly, "", \
3560 "List of methods (pkg/class.name) to restrict compilation to") \
3561 \
3562 product(ccstr, CompileCommandFile, NULL, \
3563 "Read compiler commands from this file [.hotspot_compiler]") \
3564 \
3565 product(ccstrlist, CompileCommand, "", \
3566 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3567 \
3568 develop(bool, ReplayCompiles, false, \
3569 "Enable replay of compilations from ReplayDataFile") \
3570 \
3571 product(ccstr, ReplayDataFile, NULL, \
3572 "File containing compilation replay information" \
3573 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3574 \
3575 product(ccstr, InlineDataFile, NULL, \
3576 "File containing inlining replay information" \
3577 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
3578 \
3579 develop(intx, ReplaySuppressInitializers, 2, \
3580 "Control handling of class initialization during replay: " \
3581 "0 - don't do anything special; " \
3582 "1 - treat all class initializers as empty; " \
3583 "2 - treat class initializers for application classes as empty; " \
3584 "3 - allow all class initializers to run during bootstrap but " \
3585 " pretend they are empty after starting replay") \
3586 range(0, 3) \
3587 \
3588 develop(bool, ReplayIgnoreInitErrors, false, \
3589 "Ignore exceptions thrown during initialization for replay") \
3590 \
3591 product(bool, DumpReplayDataOnError, true, \
3592 "Record replay data for crashing compiler threads") \
3593 \
3594 product(bool, CICompilerCountPerCPU, false, \
3595 "1 compiler thread for log(N CPUs)") \
3596 \
3597 develop(intx, CIFireOOMAt, -1, \
3598 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3599 "(non-negative value throws OOM after this many CI accesses " \
3600 "in each compile)") \
3601 notproduct(intx, CICrashAt, -1, \
3602 "id of compilation to trigger assert in compiler thread for " \
3603 "the purpose of testing, e.g. generation of replay data") \
3604 notproduct(bool, CIObjectFactoryVerify, false, \
3605 "enable potentially expensive verification in ciObjectFactory") \
3606 \
3607 /* Priorities */ \
3608 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3609 \
3610 product(intx, ThreadPriorityPolicy, 0, \
3611 "0 : Normal. "\
3612 " VM chooses priorities that are appropriate for normal "\
3613 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3614 " to normal native priority. Java priorities below " \
3615 " NORM_PRIORITY map to lower native priority values. On "\
3616 " Windows applications are allowed to use higher native "\
3617 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
3618 " not use the highest possible native priority, "\
3619 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
3620 " system threads. On Linux thread priorities are ignored "\
3621 " because the OS does not support static priority in "\
3622 " SCHED_OTHER scheduling class which is the only choice for "\
3623 " non-root, non-realtime applications. "\
3624 "1 : Aggressive. "\
3625 " Java thread priorities map over to the entire range of "\
3626 " native thread priorities. Higher Java thread priorities map "\
3627 " to higher native thread priorities. This policy should be "\
3628 " used with care, as sometimes it can cause performance "\
3629 " degradation in the application and/or the entire system. On "\
3630 " Linux this policy requires root privilege.") \
3631 range(0, 1) \
3632 \
3633 product(bool, ThreadPriorityVerbose, false, \
3634 "Print priority changes") \
3635 \
3636 product(intx, CompilerThreadPriority, -1, \
3637 "The native priority at which compiler threads should run " \
3638 "(-1 means no change)") \
3639 \
3640 product(intx, VMThreadPriority, -1, \
3641 "The native priority at which the VM thread should run " \
3642 "(-1 means no change)") \
3643 \
3644 product(bool, CompilerThreadHintNoPreempt, true, \
3645 "(Solaris only) Give compiler threads an extra quanta") \
3646 \
3647 product(bool, VMThreadHintNoPreempt, false, \
3648 "(Solaris only) Give VM thread an extra quanta") \
3649 \
3650 product(intx, JavaPriority1_To_OSPriority, -1, \
3651 "Map Java priorities to OS priorities") \
3652 \
3653 product(intx, JavaPriority2_To_OSPriority, -1, \
3654 "Map Java priorities to OS priorities") \
3655 \
3656 product(intx, JavaPriority3_To_OSPriority, -1, \
3657 "Map Java priorities to OS priorities") \
3658 \
3659 product(intx, JavaPriority4_To_OSPriority, -1, \
3660 "Map Java priorities to OS priorities") \
3661 \
3662 product(intx, JavaPriority5_To_OSPriority, -1, \
3663 "Map Java priorities to OS priorities") \
3664 \
3665 product(intx, JavaPriority6_To_OSPriority, -1, \
3666 "Map Java priorities to OS priorities") \
3667 \
3668 product(intx, JavaPriority7_To_OSPriority, -1, \
3669 "Map Java priorities to OS priorities") \
3670 \
3671 product(intx, JavaPriority8_To_OSPriority, -1, \
3672 "Map Java priorities to OS priorities") \
3673 \
3674 product(intx, JavaPriority9_To_OSPriority, -1, \
3675 "Map Java priorities to OS priorities") \
3676 \
3677 product(intx, JavaPriority10_To_OSPriority,-1, \
3678 "Map Java priorities to OS priorities") \
3679 \
3680 experimental(bool, UseCriticalJavaThreadPriority, false, \
3681 "Java thread priority 10 maps to critical scheduling priority") \
3682 \
3683 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3684 "Compiler thread(s) run at critical scheduling priority") \
3685 \
3686 experimental(bool, UseCriticalCMSThreadPriority, false, \
3687 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3688 \
3689 /* compiler debugging */ \
3690 notproduct(intx, CompileTheWorldStartAt, 1, \
3691 "First class to consider when using +CompileTheWorld") \
3692 \
3693 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3694 "Last class to consider when using +CompileTheWorld") \
3695 \
3696 develop(intx, NewCodeParameter, 0, \
3697 "Testing Only: Create a dedicated integer parameter before " \
3698 "putback") \
3699 \
3700 /* new oopmap storage allocation */ \
3701 develop(intx, MinOopMapAllocation, 8, \
3702 "Minimum number of OopMap entries in an OopMapSet") \
3703 \
3704 /* Background Compilation */ \
3705 develop(intx, LongCompileThreshold, 50, \
3706 "Used with +TraceLongCompiles") \
3707 \
3708 /* recompilation */ \
3709 product_pd(intx, CompileThreshold, \
3710 "number of interpreted method invocations before (re-)compiling") \
3711 \
3712 product(double, CompileThresholdScaling, 1.0, \
3713 "Factor to control when first compilation happens " \
3714 "(both with and without tiered compilation): " \
3715 "values greater than 1.0 delay counter overflow, " \
3716 "values between 0 and 1.0 rush counter overflow, " \
3717 "value of 1.0 leaves compilation thresholds unchanged " \
3718 "value of 0.0 is equivalent to -Xint. " \
3719 "" \
3720 "Flag can be set as per-method option. " \
3721 "If a value is specified for a method, compilation thresholds " \
3722 "for that method are scaled by both the value of the global flag "\
3723 "and the value of the per-method flag.") \
3724 \
3725 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3726 "Interpreter (tier 0) invocation notification frequency") \
3727 \
3728 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3729 "C1 without MDO (tier 2) invocation notification frequency") \
3730 \
3731 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3732 "C1 with MDO profiling (tier 3) invocation notification " \
3733 "frequency") \
3734 \
3735 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3736 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3737 \
3738 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3739 "Interpreter (tier 0) invocation notification frequency") \
3740 \
3741 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3742 "C1 without MDO (tier 2) invocation notification frequency") \
3743 \
3744 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3745 "C1 with MDO profiling (tier 3) invocation notification " \
3746 "frequency") \
3747 \
3748 product(intx, Tier2CompileThreshold, 0, \
3749 "threshold at which tier 2 compilation is invoked") \
3750 \
3751 product(intx, Tier2BackEdgeThreshold, 0, \
3752 "Back edge threshold at which tier 2 compilation is invoked") \
3753 \
3754 product(intx, Tier3InvocationThreshold, 200, \
3755 "Compile if number of method invocations crosses this " \
3756 "threshold") \
3757 \
3758 product(intx, Tier3MinInvocationThreshold, 100, \
3759 "Minimum invocation to compile at tier 3") \
3760 \
3761 product(intx, Tier3CompileThreshold, 2000, \
3762 "Threshold at which tier 3 compilation is invoked (invocation " \
3763 "minimum must be satisfied)") \
3764 \
3765 product(intx, Tier3BackEdgeThreshold, 60000, \
3766 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3767 \
3768 product(intx, Tier4InvocationThreshold, 5000, \
3769 "Compile if number of method invocations crosses this " \
3770 "threshold") \
3771 \
3772 product(intx, Tier4MinInvocationThreshold, 600, \
3773 "Minimum invocation to compile at tier 4") \
3774 \
3775 product(intx, Tier4CompileThreshold, 15000, \
3776 "Threshold at which tier 4 compilation is invoked (invocation " \
3777 "minimum must be satisfied") \
3778 \
3779 product(intx, Tier4BackEdgeThreshold, 40000, \
3780 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3781 \
3782 product(intx, Tier3DelayOn, 5, \
3783 "If C2 queue size grows over this amount per compiler thread " \
3784 "stop compiling at tier 3 and start compiling at tier 2") \
3785 \
3786 product(intx, Tier3DelayOff, 2, \
3787 "If C2 queue size is less than this amount per compiler thread " \
3788 "allow methods compiled at tier 2 transition to tier 3") \
3789 \
3790 product(intx, Tier3LoadFeedback, 5, \
3791 "Tier 3 thresholds will increase twofold when C1 queue size " \
3792 "reaches this amount per compiler thread") \
3793 \
3794 product(intx, Tier4LoadFeedback, 3, \
3795 "Tier 4 thresholds will increase twofold when C2 queue size " \
3796 "reaches this amount per compiler thread") \
3797 \
3798 product(intx, TieredCompileTaskTimeout, 50, \
3799 "Kill compile task if method was not used within " \
3800 "given timeout in milliseconds") \
3801 \
3802 product(intx, TieredStopAtLevel, 4, \
3803 "Stop at given compilation level") \
3804 \
3805 product(intx, Tier0ProfilingStartPercentage, 200, \
3806 "Start profiling in interpreter if the counters exceed tier 3 " \
3807 "thresholds by the specified percentage") \
3808 \
3809 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3810 "Increase the compile threshold for C1 compilation if the code " \
3811 "cache is filled by the specified percentage") \
3812 range(0, 99) \
3813 \
3814 product(intx, TieredRateUpdateMinTime, 1, \
3815 "Minimum rate sampling interval (in milliseconds)") \
3816 \
3817 product(intx, TieredRateUpdateMaxTime, 25, \
3818 "Maximum rate sampling interval (in milliseconds)") \
3819 \
3820 product_pd(bool, TieredCompilation, \
3821 "Enable tiered compilation") \
3822 \
3823 product(bool, PrintTieredEvents, false, \
3824 "Print tiered events notifications") \
3825 \
3826 product_pd(intx, OnStackReplacePercentage, \
3827 "NON_TIERED number of method invocations/branches (expressed as " \
3828 "% of CompileThreshold) before (re-)compiling OSR code") \
3829 \
3830 product(intx, InterpreterProfilePercentage, 33, \
3831 "NON_TIERED number of method invocations/branches (expressed as " \
3832 "% of CompileThreshold) before profiling in the interpreter") \
3833 range(0, 100) \
3834 \
3835 develop(intx, MaxRecompilationSearchLength, 10, \
3836 "The maximum number of frames to inspect when searching for " \
3837 "recompilee") \
3838 \
3839 develop(intx, MaxInterpretedSearchLength, 3, \
3840 "The maximum number of interpreted frames to skip when searching "\
3841 "for recompilee") \
3842 \
3843 develop(intx, DesiredMethodLimit, 8000, \
3844 "The desired maximum method size (in bytecodes) after inlining") \
3845 \
3846 develop(intx, HugeMethodLimit, 8000, \
3847 "Don't compile methods larger than this if " \
3848 "+DontCompileHugeMethods") \
3849 \
3850 /* New JDK 1.4 reflection implementation */ \
3851 \
3852 develop(intx, FastSuperclassLimit, 8, \
3853 "Depth of hardwired instanceof accelerator array") \
3854 \
3855 /* Properties for Java libraries */ \
3856 \
3857 product(size_t, MaxDirectMemorySize, 0, \
3858 "Maximum total size of NIO direct-buffer allocations") \
3859 \
3860 /* Flags used for temporary code during development */ \
3861 \
3862 diagnostic(bool, UseNewCode, false, \
3863 "Testing Only: Use the new version while testing") \
3864 \
3865 diagnostic(bool, UseNewCode2, false, \
3866 "Testing Only: Use the new version while testing") \
3867 \
3868 diagnostic(bool, UseNewCode3, false, \
3869 "Testing Only: Use the new version while testing") \
3870 \
3871 /* flags for performance data collection */ \
3872 \
3873 product(bool, UsePerfData, falseInEmbedded, \
3874 "Flag to disable jvmstat instrumentation for performance testing "\
3875 "and problem isolation purposes") \
3876 \
3877 product(bool, PerfDataSaveToFile, false, \
3878 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3879 \
3880 product(ccstr, PerfDataSaveFile, NULL, \
3881 "Save PerfData memory to the specified absolute pathname. " \
3882 "The string %p in the file name (if present) " \
3883 "will be replaced by pid") \
3884 \
3885 product(intx, PerfDataSamplingInterval, 50, \
3886 "Data sampling interval (in milliseconds)") \
3887 \
3888 develop(bool, PerfTraceDataCreation, false, \
3889 "Trace creation of Performance Data Entries") \
3890 \
3891 develop(bool, PerfTraceMemOps, false, \
3892 "Trace PerfMemory create/attach/detach calls") \
3893 \
3894 product(bool, PerfDisableSharedMem, false, \
3895 "Store performance data in standard memory") \
3896 \
3897 product(intx, PerfDataMemorySize, 64*K, \
3898 "Size of performance data memory region. Will be rounded " \
3899 "up to a multiple of the native os page size.") \
3900 \
3901 product(intx, PerfMaxStringConstLength, 1024, \
3902 "Maximum PerfStringConstant string length before truncation") \
3903 \
3904 product(bool, PerfAllowAtExitRegistration, false, \
3905 "Allow registration of atexit() methods") \
3906 \
3907 product(bool, PerfBypassFileSystemCheck, false, \
3908 "Bypass Win32 file system criteria checks (Windows Only)") \
3909 \
3910 product(intx, UnguardOnExecutionViolation, 0, \
3911 "Unguard page and retry on no-execute fault (Win32 only) " \
3912 "0=off, 1=conservative, 2=aggressive") \
3913 range(0, 2) \
3914 \
3915 /* Serviceability Support */ \
3916 \
3917 product(bool, ManagementServer, false, \
3918 "Create JMX Management Server") \
3919 \
3920 product(bool, DisableAttachMechanism, false, \
3921 "Disable mechanism that allows tools to attach to this VM") \
3922 \
3923 product(bool, StartAttachListener, false, \
3924 "Always start Attach Listener at VM startup") \
3925 \
3926 manageable(bool, PrintConcurrentLocks, false, \
3927 "Print java.util.concurrent locks in thread dump") \
3928 \
3929 product(bool, TransmitErrorReport, false, \
3930 "Enable error report transmission on erroneous termination") \
3931 \
3932 product(ccstr, ErrorReportServer, NULL, \
3933 "Override built-in error report server address") \
3934 \
3935 /* Shared spaces */ \
3936 \
3937 product(bool, UseSharedSpaces, true, \
3938 "Use shared spaces for metadata") \
3939 \
3940 product(bool, VerifySharedSpaces, false, \
3941 "Verify shared spaces (false for default archive, true for " \
3942 "archive specified by -XX:SharedArchiveFile)") \
3943 \
3944 product(bool, RequireSharedSpaces, false, \
3945 "Require shared spaces for metadata") \
3946 \
3947 product(bool, DumpSharedSpaces, false, \
3948 "Special mode: JVM reads a class list, loads classes, builds " \
3949 "shared spaces, and dumps the shared spaces to a file to be " \
3950 "used in future JVM runs") \
3951 \
3952 product(bool, PrintSharedSpaces, false, \
3953 "Print usage of shared spaces") \
3954 \
3955 product(bool, PrintSharedArchiveAndExit, false, \
3956 "Print shared archive file contents") \
3957 \
3958 product(bool, PrintSharedDictionary, false, \
3959 "If PrintSharedArchiveAndExit is true, also print the shared " \
3960 "dictionary") \
3961 \
3962 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3963 "Size of read-write space for metadata (in bytes)") \
3964 \
3965 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3966 "Size of read-only space for metadata (in bytes)") \
3967 \
3968 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3969 "Size of the shared miscellaneous data area (in bytes)") \
3970 \
3971 product(uintx, SharedMiscCodeSize, 120*K, \
3972 "Size of the shared miscellaneous code area (in bytes)") \
3973 \
3974 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3975 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3976 "Address to allocate shared memory region for class data") \
3977 \
3978 product(uintx, SharedSymbolTableBucketSize, 4, \
3979 "Average number of symbols per bucket in shared table") \
3980 \
3981 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \
3982 "Do not quit -Xshare:dump even if we encounter unverifiable " \
3983 "classes. Just exclude them from the shared dictionary.") \
3984 \
3985 diagnostic(bool, PrintMethodHandleStubs, false, \
3986 "Print generated stub code for method handles") \
3987 \
3988 develop(bool, TraceMethodHandles, false, \
3989 "trace internal method handle operations") \
3990 \
3991 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3992 "perform extra checks when constructing method handles") \
3993 \
3994 diagnostic(bool, ShowHiddenFrames, false, \
3995 "show method handle implementation frames (usually hidden)") \
3996 \
3997 experimental(bool, TrustFinalNonStaticFields, false, \
3998 "trust final non-static declarations for constant folding") \
3999 \
4000 diagnostic(bool, FoldStableValues, true, \
4001 "Optimize loads from stable fields (marked w/ @Stable)") \
4002 \
4003 develop(bool, TraceInvokeDynamic, false, \
4004 "trace internal invoke dynamic operations") \
4005 \
4006 diagnostic(bool, PauseAtStartup, false, \
4007 "Causes the VM to pause at startup time and wait for the pause " \
4008 "file to be removed (default: ./vm.paused.<pid>)") \
4009 \
4010 diagnostic(ccstr, PauseAtStartupFile, NULL, \
4011 "The file to create and for whose removal to await when pausing " \
4012 "at startup. (default: ./vm.paused.<pid>)") \
4013 \
4014 diagnostic(bool, PauseAtExit, false, \
4015 "Pause and wait for keypress on exit if a debugger is attached") \
4016 \
4017 product(bool, ExtendedDTraceProbes, false, \
4018 "Enable performance-impacting dtrace probes") \
4019 \
4020 product(bool, DTraceMethodProbes, false, \
4021 "Enable dtrace probes for method-entry and method-exit") \
4022 \
4023 product(bool, DTraceAllocProbes, false, \
4024 "Enable dtrace probes for object allocation") \
4025 \
4026 product(bool, DTraceMonitorProbes, false, \
4027 "Enable dtrace probes for monitor events") \
4028 \
4029 product(bool, RelaxAccessControlCheck, false, \
4030 "Relax the access control checks in the verifier") \
4031 \
4032 product(uintx, StringTableSize, defaultStringTableSize, \
4033 "Number of buckets in the interned String table") \
4034 range(minimumStringTableSize, 111*defaultStringTableSize) \
4035 \
4036 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
4037 "Number of buckets in the JVM internal Symbol table") \
4038 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \
4039 \
4040 product(bool, UseStringDeduplication, false, \
4041 "Use string deduplication") \
4042 \
4043 product(bool, PrintStringDeduplicationStatistics, false, \
4044 "Print string deduplication statistics") \
4045 \
4046 product(uintx, StringDeduplicationAgeThreshold, 3, \
4047 "A string must reach this age (or be promoted to an old region) " \
4048 "to be considered for deduplication") \
4049 range(1, markOopDesc::max_age) \
4050 \
4051 diagnostic(bool, StringDeduplicationResizeALot, false, \
4052 "Force table resize every time the table is scanned") \
4053 \
4054 diagnostic(bool, StringDeduplicationRehashALot, false, \
4055 "Force table rehash every time the table is scanned") \
4056 \
4057 develop(bool, TraceDefaultMethods, false, \
4058 "Trace the default method processing steps") \
4059 \
4060 diagnostic(bool, WhiteBoxAPI, false, \
4061 "Enable internal testing APIs") \
4062 \
4063 product(bool, PrintGCCause, true, \
4064 "Include GC cause in GC logging") \
4065 \
4066 experimental(intx, SurvivorAlignmentInBytes, 0, \
4067 "Default survivor space alignment in bytes") \
4068 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
4069 \
4070 product(bool , AllowNonVirtualCalls, false, \
4071 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
4072 \
4073 product(ccstr, DumpLoadedClassList, NULL, \
4074 "Dump the names all loaded classes, that could be stored into " \
4075 "the CDS archive, in the specified file") \
4076 \
4077 product(ccstr, SharedClassListFile, NULL, \
4078 "Override the default CDS class list") \
4079 \
4080 diagnostic(ccstr, SharedArchiveFile, NULL, \
4081 "Override the default location of the CDS archive file") \
4082 \
4083 product(ccstr, ExtraSharedClassListFile, NULL, \
4084 "Extra classlist for building the CDS archive file") \
4085 \
4086 experimental(size_t, ArrayAllocatorMallocLimit, \
4087 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
4088 "Allocation less than this value will be allocated " \
4089 "using malloc. Larger allocations will use mmap.") \
4090 \
4091 experimental(bool, AlwaysAtomicAccesses, false, \
4092 "Accesses to all variables should always be atomic") \
4093 \
4094 product(bool, EnableTracing, false, \
4095 "Enable event-based tracing") \
4096 \
4097 product(bool, UseLockedTracing, false, \
4098 "Use locked-tracing when doing event-based tracing") \
4099 \
4100 diagnostic(bool, UseUnalignedAccesses, false, \
4101 "Use unaligned memory accesses in sun.misc.Unsafe") \
4102 \
4103 product_pd(bool, PreserveFramePointer, \
4104 "Use the FP register for holding the frame pointer " \
4105 "and not as a general purpose register.") \
4106 \
4107 diagnostic(bool, CheckIntrinsics, true, \
4108 "When a class C is loaded, check that " \
4109 "(1) all intrinsics defined by the VM for class C are present "\
4110 "in the loaded class file and are marked with the " \
4111 "@HotSpotIntrinsicCandidate annotation, that " \
4112 "(2) there is an intrinsic registered for all loaded methods " \
4113 "that are annotated with the @HotSpotIntrinsicCandidate " \
4114 "annotation, and that " \
4115 "(3) no orphan methods exist for class C (i.e., methods for " \
4116 "which the VM declares an intrinsic but that are not declared "\
4117 "in the loaded class C. " \
4118 "Check (3) is available only in debug builds.")
4119
4120 /*
4121 * Macros for factoring of globals
4122 */
4123
4124 // Interface macros
4125 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4126 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
4127 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
4128 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4129 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
4130 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
4131 #ifdef PRODUCT
4132 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
4133 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
4134 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
4135 #else
4136 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
4137 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
4138 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4139 #endif // PRODUCT
4140 // Special LP64 flags, product only needed for now.
4141 #ifdef _LP64
4142 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4143 #else
4144 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4145 #endif // _LP64
4146
4147 // Implementation macros
4148 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
4149 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
4150 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
4151 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4152 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
4153 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
4154 #ifdef PRODUCT
4155 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
4156 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
4157 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
4158 #else
4159 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
4160 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
4161 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
4162 #endif // PRODUCT
4163 #ifdef _LP64
4164 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4165 #else
4166 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4167 #endif // _LP64
4168
4169 // Only materialize src code for range checking when required, ignore otherwise
4170 #define IGNORE_RANGE(a, b)
4171 // Only materialize src code for contraint checking when required, ignore otherwise
4172 #define IGNORE_CONSTRAINT(func,type)
4173
4174 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4175 DECLARE_PD_DEVELOPER_FLAG, \
4176 DECLARE_PRODUCT_FLAG, \
4177 DECLARE_PD_PRODUCT_FLAG, \
4178 DECLARE_DIAGNOSTIC_FLAG, \
4179 DECLARE_EXPERIMENTAL_FLAG, \
4180 DECLARE_NOTPRODUCT_FLAG, \
4181 DECLARE_MANAGEABLE_FLAG, \
4182 DECLARE_PRODUCT_RW_FLAG, \
4183 DECLARE_LP64_PRODUCT_FLAG, \
4184 IGNORE_RANGE, \
4185 IGNORE_CONSTRAINT)
4186
4187 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4188 DECLARE_PD_DEVELOPER_FLAG, \
4189 DECLARE_PRODUCT_FLAG, \
4190 DECLARE_PD_PRODUCT_FLAG, \
4191 DECLARE_DIAGNOSTIC_FLAG, \
4192 DECLARE_NOTPRODUCT_FLAG, \
4193 IGNORE_RANGE, \
4194 IGNORE_CONSTRAINT)
4195
4196 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4197 DECLARE_PRODUCT_FLAG, \
4198 DECLARE_DIAGNOSTIC_FLAG, \
4199 DECLARE_EXPERIMENTAL_FLAG, \
4200 DECLARE_NOTPRODUCT_FLAG, \
4201 IGNORE_RANGE, \
4202 IGNORE_CONSTRAINT)
4203
4204 // Extensions
4205
4206 #include "runtime/globals_ext.hpp"
4207
4208 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP