1 /*
2 * Copyright (c) 1997, 2013, 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_OS_FAMILY_linux
56 # include "globals_linux.hpp"
57 #endif
58 #ifdef TARGET_OS_FAMILY_solaris
59 # include "globals_solaris.hpp"
60 #endif
61 #ifdef TARGET_OS_FAMILY_windows
62 # include "globals_windows.hpp"
63 #endif
64 #ifdef TARGET_OS_FAMILY_bsd
65 # include "globals_bsd.hpp"
66 #endif
67 #ifdef TARGET_OS_ARCH_linux_x86
68 # include "globals_linux_x86.hpp"
69 #endif
70 #ifdef TARGET_OS_ARCH_linux_sparc
71 # include "globals_linux_sparc.hpp"
72 #endif
73 #ifdef TARGET_OS_ARCH_linux_zero
74 # include "globals_linux_zero.hpp"
75 #endif
76 #ifdef TARGET_OS_ARCH_solaris_x86
77 # include "globals_solaris_x86.hpp"
78 #endif
79 #ifdef TARGET_OS_ARCH_solaris_sparc
80 # include "globals_solaris_sparc.hpp"
81 #endif
82 #ifdef TARGET_OS_ARCH_windows_x86
83 # include "globals_windows_x86.hpp"
84 #endif
85 #ifdef TARGET_OS_ARCH_linux_arm
86 # include "globals_linux_arm.hpp"
87 #endif
88 #ifdef TARGET_OS_ARCH_linux_ppc
89 # include "globals_linux_ppc.hpp"
90 #endif
91 #ifdef TARGET_OS_ARCH_bsd_x86
92 # include "globals_bsd_x86.hpp"
93 #endif
94 #ifdef TARGET_OS_ARCH_bsd_zero
95 # include "globals_bsd_zero.hpp"
96 #endif
97 #ifdef COMPILER1
98 #ifdef TARGET_ARCH_x86
99 # include "c1_globals_x86.hpp"
100 #endif
101 #ifdef TARGET_ARCH_sparc
102 # include "c1_globals_sparc.hpp"
103 #endif
104 #ifdef TARGET_ARCH_arm
105 # include "c1_globals_arm.hpp"
106 #endif
107 #ifdef TARGET_ARCH_ppc
108 # include "c1_globals_ppc.hpp"
109 #endif
110 #ifdef TARGET_OS_FAMILY_linux
111 # include "c1_globals_linux.hpp"
112 #endif
113 #ifdef TARGET_OS_FAMILY_solaris
114 # include "c1_globals_solaris.hpp"
115 #endif
116 #ifdef TARGET_OS_FAMILY_windows
117 # include "c1_globals_windows.hpp"
118 #endif
119 #ifdef TARGET_OS_FAMILY_bsd
120 # include "c1_globals_bsd.hpp"
121 #endif
122 #endif
123 #ifdef COMPILER2
124 #ifdef TARGET_ARCH_x86
125 # include "c2_globals_x86.hpp"
126 #endif
127 #ifdef TARGET_ARCH_sparc
128 # include "c2_globals_sparc.hpp"
129 #endif
130 #ifdef TARGET_ARCH_arm
131 # include "c2_globals_arm.hpp"
132 #endif
133 #ifdef TARGET_OS_FAMILY_linux
134 # include "c2_globals_linux.hpp"
135 #endif
136 #ifdef TARGET_OS_FAMILY_solaris
137 # include "c2_globals_solaris.hpp"
138 #endif
139 #ifdef TARGET_OS_FAMILY_windows
140 # include "c2_globals_windows.hpp"
141 #endif
142 #ifdef TARGET_OS_FAMILY_bsd
143 # include "c2_globals_bsd.hpp"
144 #endif
145 #endif
146 #ifdef SHARK
147 #ifdef TARGET_ARCH_zero
148 # include "shark_globals_zero.hpp"
149 #endif
150 #endif
151
152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
153 define_pd_global(bool, BackgroundCompilation, false);
154 define_pd_global(bool, UseTLAB, false);
155 define_pd_global(bool, CICompileOSR, false);
156 define_pd_global(bool, UseTypeProfile, false);
157 define_pd_global(bool, UseOnStackReplacement, false);
158 define_pd_global(bool, InlineIntrinsics, false);
159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
160 define_pd_global(bool, ProfileInterpreter, false);
161 define_pd_global(bool, ProfileTraps, false);
162 define_pd_global(bool, TieredCompilation, false);
163
164 define_pd_global(intx, CompileThreshold, 0);
165 define_pd_global(intx, BackEdgeThreshold, 0);
166
167 define_pd_global(intx, OnStackReplacePercentage, 0);
168 define_pd_global(bool, ResizeTLAB, false);
169 define_pd_global(intx, FreqInlineSize, 0);
170 define_pd_global(intx, InlineSmallCode, 0);
171 define_pd_global(intx, NewSizeThreadIncrease, 4*K);
172 define_pd_global(intx, InlineClassNatives, true);
173 define_pd_global(intx, InlineUnsafeOps, true);
174 define_pd_global(intx, InitialCodeCacheSize, 160*K);
175 define_pd_global(intx, ReservedCodeCacheSize, 32*M);
176 define_pd_global(intx, NonProfiledCodeHeapSize, 19*M);
177 define_pd_global(intx, ProfiledCodeHeapSize, 9*M );
178 define_pd_global(intx, NonMethodCodeHeapSize, 4*M );
179
180 define_pd_global(intx, CodeCacheExpansionSize, 32*K);
181 define_pd_global(intx, CodeCacheMinBlockLength, 1);
182 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
183 define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M));
184 define_pd_global(bool, NeverActAsServerClassMachine, true);
185 define_pd_global(uint64_t,MaxRAM, 1ULL*G);
186 #define CI_COMPILER_COUNT 0
187 #else
188
189 #ifdef COMPILER2
190 #define CI_COMPILER_COUNT 2
191 #else
192 #define CI_COMPILER_COUNT 1
193 #endif // COMPILER2
194
195 #endif // no compilers
196
197 // string type aliases used only in this file
198 typedef const char* ccstr;
199 typedef const char* ccstrlist; // represents string arguments which accumulate
200
201 struct Flag {
202 enum Flags {
203 // value origin
204 DEFAULT = 0,
205 COMMAND_LINE = 1,
206 ENVIRON_VAR = 2,
207 CONFIG_FILE = 3,
208 MANAGEMENT = 4,
209 ERGONOMIC = 5,
210 ATTACH_ON_DEMAND = 6,
211 INTERNAL = 7,
212
213 LAST_VALUE_ORIGIN = INTERNAL,
214 VALUE_ORIGIN_BITS = 4,
215 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
216
217 // flag kind
218 KIND_PRODUCT = 1 << 4,
219 KIND_MANAGEABLE = 1 << 5,
220 KIND_DIAGNOSTIC = 1 << 6,
221 KIND_EXPERIMENTAL = 1 << 7,
222 KIND_NOT_PRODUCT = 1 << 8,
223 KIND_DEVELOP = 1 << 9,
224 KIND_PLATFORM_DEPENDENT = 1 << 10,
225 KIND_READ_WRITE = 1 << 11,
226 KIND_C1 = 1 << 12,
227 KIND_C2 = 1 << 13,
228 KIND_ARCH = 1 << 14,
229 KIND_SHARK = 1 << 15,
230 KIND_LP64_PRODUCT = 1 << 16,
231 KIND_COMMERCIAL = 1 << 17,
232
233 KIND_MASK = ~VALUE_ORIGIN_MASK
234 };
235
236 const char* _type;
237 const char* _name;
238 void* _addr;
239 NOT_PRODUCT(const char* _doc;)
240 Flags _flags;
241
242 // points to all Flags static array
243 static Flag* flags;
244
245 // number of flags
246 static size_t numFlags;
247
248 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false);
249 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
250
251 void check_writable();
252
253 bool is_bool() const;
254 bool get_bool() const;
255 void set_bool(bool value);
256
257 bool is_intx() const;
258 intx get_intx() const;
259 void set_intx(intx value);
260
261 bool is_uintx() const;
262 uintx get_uintx() const;
263 void set_uintx(uintx value);
264
265 bool is_uint64_t() const;
266 uint64_t get_uint64_t() const;
267 void set_uint64_t(uint64_t value);
268
269 bool is_double() const;
270 double get_double() const;
271 void set_double(double value);
272
273 bool is_ccstr() const;
274 bool ccstr_accumulates() const;
275 ccstr get_ccstr() const;
276 void set_ccstr(ccstr value);
277
278 Flags get_origin();
279 void set_origin(Flags origin);
280
281 bool is_default();
282 bool is_ergonomic();
283 bool is_command_line();
284
285 bool is_product() const;
286 bool is_manageable() const;
287 bool is_diagnostic() const;
288 bool is_experimental() const;
289 bool is_notproduct() const;
290 bool is_develop() const;
291 bool is_read_write() const;
292 bool is_commercial() const;
293
294 bool is_constant_in_binary() const;
295
296 bool is_unlocker() const;
297 bool is_unlocked() const;
298 bool is_writeable() const;
299 bool is_external() const;
300
301 bool is_unlocker_ext() const;
302 bool is_unlocked_ext() const;
303 bool is_writeable_ext() const;
304 bool is_external_ext() const;
305
306 void get_locked_message(char*, int) const;
307 void get_locked_message_ext(char*, int) const;
308
309 void print_on(outputStream* st, bool withComments = false );
310 void print_kind(outputStream* st);
311 void print_as_flag(outputStream* st);
312 };
313
314 // debug flags control various aspects of the VM and are global accessible
315
316 // use FlagSetting to temporarily change some debug flag
317 // e.g. FlagSetting fs(DebugThisAndThat, true);
318 // restored to previous value upon leaving scope
319 class FlagSetting {
320 bool val;
321 bool* flag;
322 public:
323 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
324 ~FlagSetting() { *flag = val; }
325 };
326
327
328 class CounterSetting {
329 intx* counter;
330 public:
331 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
332 ~CounterSetting() { (*counter)--; }
333 };
334
335
336 class UIntFlagSetting {
337 uintx val;
338 uintx* flag;
339 public:
340 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
341 ~UIntFlagSetting() { *flag = val; }
342 };
343
344
345 class DoubleFlagSetting {
346 double val;
347 double* flag;
348 public:
349 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
350 ~DoubleFlagSetting() { *flag = val; }
351 };
352
353
354 class CommandLineFlags {
355 public:
356 static bool boolAt(char* name, size_t len, bool* value);
357 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
358 static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin);
359 static bool boolAtPut(char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
360
361 static bool intxAt(char* name, size_t len, intx* value);
362 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
363 static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin);
364 static bool intxAtPut(char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
365
366 static bool uintxAt(char* name, size_t len, uintx* value);
367 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
368 static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin);
369 static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
370
371 static bool uint64_tAt(char* name, size_t len, uint64_t* value);
372 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
373 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin);
374 static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
375
376 static bool doubleAt(char* name, size_t len, double* value);
377 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
378 static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin);
379 static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
380
381 static bool ccstrAt(char* name, size_t len, ccstr* value);
382 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
383 static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin);
384 static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
385
386 // Returns false if name is not a command line flag.
387 static bool wasSetOnCmdline(const char* name, bool* value);
388 static void printSetFlags(outputStream* out);
389
390 static void printFlags(outputStream* out, bool withComments);
391
392 static void verify() PRODUCT_RETURN;
393 };
394
395 // use this for flags that are true by default in the debug version but
396 // false in the optimized version, and vice versa
397 #ifdef ASSERT
398 #define trueInDebug true
399 #define falseInDebug false
400 #else
401 #define trueInDebug false
402 #define falseInDebug true
403 #endif
404
405 // use this for flags that are true per default in the product build
406 // but false in development builds, and vice versa
407 #ifdef PRODUCT
408 #define trueInProduct true
409 #define falseInProduct false
410 #else
411 #define trueInProduct false
412 #define falseInProduct true
413 #endif
414
415 #ifdef JAVASE_EMBEDDED
416 #define falseInEmbedded false
417 #else
418 #define falseInEmbedded true
419 #endif
420
421 // develop flags are settable / visible only during development and are constant in the PRODUCT version
422 // product flags are always settable / visible
423 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
424
425 // A flag must be declared with one of the following types:
426 // bool, intx, uintx, ccstr.
427 // The type "ccstr" is an alias for "const char*" and is used
428 // only in this file, because the macrology requires single-token type names.
429
430 // Note: Diagnostic options not meant for VM tuning or for product modes.
431 // They are to be used for VM quality assurance or field diagnosis
432 // of VM bugs. They are hidden so that users will not be encouraged to
433 // try them as if they were VM ordinary execution options. However, they
434 // are available in the product version of the VM. Under instruction
435 // from support engineers, VM customers can turn them on to collect
436 // diagnostic information about VM problems. To use a VM diagnostic
437 // option, you must first specify +UnlockDiagnosticVMOptions.
438 // (This master switch also affects the behavior of -Xprintflags.)
439 //
440 // experimental flags are in support of features that are not
441 // part of the officially supported product, but are available
442 // for experimenting with. They could, for example, be performance
443 // features that may not have undergone full or rigorous QA, but which may
444 // help performance in some cases and released for experimentation
445 // by the community of users and developers. This flag also allows one to
446 // be able to build a fully supported product that nonetheless also
447 // ships with some unsupported, lightly tested, experimental features.
448 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
449 // UnlockExperimentalVMOptions flag, which allows the control and
450 // modification of the experimental flags.
451 //
452 // Nota bene: neither diagnostic nor experimental options should be used casually,
453 // and they are not supported on production loads, except under explicit
454 // direction from support engineers.
455 //
456 // manageable flags are writeable external product flags.
457 // They are dynamically writeable through the JDK management interface
458 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
459 // These flags are external exported interface (see CCC). The list of
460 // manageable flags can be queried programmatically through the management
461 // interface.
462 //
463 // A flag can be made as "manageable" only if
464 // - the flag is defined in a CCC as an external exported interface.
465 // - the VM implementation supports dynamic setting of the flag.
466 // This implies that the VM must *always* query the flag variable
467 // and not reuse state related to the flag state at any given time.
468 // - you want the flag to be queried programmatically by the customers.
469 //
470 // product_rw flags are writeable internal product flags.
471 // They are like "manageable" flags but for internal/private use.
472 // The list of product_rw flags are internal/private flags which
473 // may be changed/removed in a future release. It can be set
474 // through the management interface to get/set value
475 // when the name of flag is supplied.
476 //
477 // A flag can be made as "product_rw" only if
478 // - the VM implementation supports dynamic setting of the flag.
479 // This implies that the VM must *always* query the flag variable
480 // and not reuse state related to the flag state at any given time.
481 //
482 // Note that when there is a need to support develop flags to be writeable,
483 // it can be done in the same way as product_rw.
484
485 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
486 \
487 lp64_product(bool, UseCompressedOops, false, \
488 "Use 32-bit object references in 64-bit VM " \
489 "lp64_product means flag is always constant in 32 bit VM") \
490 \
491 lp64_product(bool, UseCompressedClassPointers, false, \
492 "Use 32-bit class pointers in 64-bit VM " \
493 "lp64_product means flag is always constant in 32 bit VM") \
494 \
495 notproduct(bool, CheckCompressedOops, true, \
496 "generate checks in encoding/decoding code in debug VM") \
497 \
498 product_pd(uintx, HeapBaseMinAddress, \
499 "OS specific low limit for heap base address") \
500 \
501 diagnostic(bool, PrintCompressedOopsMode, false, \
502 "Print compressed oops base address and encoding mode") \
503 \
504 lp64_product(intx, ObjectAlignmentInBytes, 8, \
505 "Default object alignment in bytes, 8 is minimum") \
506 \
507 product(bool, AssumeMP, false, \
508 "Instruct the VM to assume multiple processors are available") \
509 \
510 /* UseMembar is theoretically a temp flag used for memory barrier \
511 * removal testing. It was supposed to be removed before FCS but has \
512 * been re-added (see 6401008) */ \
513 product_pd(bool, UseMembar, \
514 "(Unstable) Issues membars on thread state transitions") \
515 \
516 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
517 * that don't support it. This will be replaced by processor detection \
518 * logic. \
519 */ \
520 product(bool, UsePPCLWSYNC, true, \
521 "Use lwsync instruction if true, else use slower sync") \
522 \
523 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
524 "Whether to clean the chunk pool asynchronously") \
525 \
526 /* Temporary: See 6948537 */ \
527 experimental(bool, UseMemSetInBOT, true, \
528 "(Unstable) uses memset in BOT updates in GC code") \
529 \
530 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
531 "Enable normal processing of flags relating to field diagnostics")\
532 \
533 experimental(bool, UnlockExperimentalVMOptions, false, \
534 "Enable normal processing of flags relating to experimental features")\
535 \
536 product(bool, JavaMonitorsInStackTrace, true, \
537 "Print info. about Java monitor locks when the stacks are dumped")\
538 \
539 product_pd(bool, UseLargePages, \
540 "Use large page memory") \
541 \
542 product_pd(bool, UseLargePagesIndividualAllocation, \
543 "Allocate large pages individually for better affinity") \
544 \
545 develop(bool, LargePagesIndividualAllocationInjectError, false, \
546 "Fail large pages individual allocation") \
547 \
548 develop(bool, TracePageSizes, false, \
549 "Trace page size selection and usage.") \
550 \
551 product(bool, UseNUMA, false, \
552 "Use NUMA if available") \
553 \
554 product(bool, UseNUMAInterleaving, false, \
555 "Interleave memory across NUMA nodes if available") \
556 \
557 product(uintx, NUMAInterleaveGranularity, 2*M, \
558 "Granularity to use for NUMA interleaving on Windows OS") \
559 \
560 product(bool, ForceNUMA, false, \
561 "Force NUMA optimizations on single-node/UMA systems") \
562 \
563 product(uintx, NUMAChunkResizeWeight, 20, \
564 "Percentage (0-100) used to weigh the current sample when " \
565 "computing exponentially decaying average for " \
566 "AdaptiveNUMAChunkSizing") \
567 \
568 product(uintx, NUMASpaceResizeRate, 1*G, \
569 "Do not reallocate more that this amount per collection") \
570 \
571 product(bool, UseAdaptiveNUMAChunkSizing, true, \
572 "Enable adaptive chunk sizing for NUMA") \
573 \
574 product(bool, NUMAStats, false, \
575 "Print NUMA stats in detailed heap information") \
576 \
577 product(uintx, NUMAPageScanRate, 256, \
578 "Maximum number of pages to include in the page scan procedure") \
579 \
580 product_pd(bool, NeedsDeoptSuspend, \
581 "True for register window machines (sparc/ia64)") \
582 \
583 product(intx, UseSSE, 99, \
584 "Highest supported SSE instructions set on x86/x64") \
585 \
586 product(bool, UseAES, false, \
587 "Control whether AES instructions can be used on x86/x64") \
588 \
589 product(uintx, LargePageSizeInBytes, 0, \
590 "Large page size (0 to let VM choose the page size") \
591 \
592 product(uintx, LargePageHeapSizeThreshold, 128*M, \
593 "Use large pages if max heap is at least this big") \
594 \
595 product(bool, ForceTimeHighResolution, false, \
596 "Using high time resolution(For Win32 only)") \
597 \
598 develop(bool, TraceItables, false, \
599 "Trace initialization and use of itables") \
600 \
601 develop(bool, TracePcPatching, false, \
602 "Trace usage of frame::patch_pc") \
603 \
604 develop(bool, TraceJumps, false, \
605 "Trace assembly jumps in thread ring buffer") \
606 \
607 develop(bool, TraceRelocator, false, \
608 "Trace the bytecode relocator") \
609 \
610 develop(bool, TraceLongCompiles, false, \
611 "Print out every time compilation is longer than " \
612 "a given threashold") \
613 \
614 develop(bool, SafepointALot, false, \
615 "Generates a lot of safepoints. Works with " \
616 "GuaranteedSafepointInterval") \
617 \
618 product_pd(bool, BackgroundCompilation, \
619 "A thread requesting compilation is not blocked during " \
620 "compilation") \
621 \
622 product(bool, PrintVMQWaitTime, false, \
623 "Prints out the waiting time in VM operation queue") \
624 \
625 develop(bool, NoYieldsInMicrolock, false, \
626 "Disable yields in microlock") \
627 \
628 develop(bool, TraceOopMapGeneration, false, \
629 "Shows oopmap generation") \
630 \
631 product(bool, MethodFlushing, true, \
632 "Reclamation of zombie and not-entrant methods") \
633 \
634 develop(bool, VerifyStack, false, \
635 "Verify stack of each thread when it is entering a runtime call") \
636 \
637 diagnostic(bool, ForceUnreachable, false, \
638 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
639 \
640 notproduct(bool, StressDerivedPointers, false, \
641 "Force scavenge when a derived pointers is detected on stack " \
642 "after rtm call") \
643 \
644 develop(bool, TraceDerivedPointers, false, \
645 "Trace traversal of derived pointers on stack") \
646 \
647 notproduct(bool, TraceCodeBlobStacks, false, \
648 "Trace stack-walk of codeblobs") \
649 \
650 product(bool, PrintJNIResolving, false, \
651 "Used to implement -v:jni") \
652 \
653 notproduct(bool, PrintRewrites, false, \
654 "Print methods that are being rewritten") \
655 \
656 product(bool, UseInlineCaches, true, \
657 "Use Inline Caches for virtual calls ") \
658 \
659 develop(bool, InlineArrayCopy, true, \
660 "inline arraycopy native that is known to be part of " \
661 "base library DLL") \
662 \
663 develop(bool, InlineObjectHash, true, \
664 "inline Object::hashCode() native that is known to be part " \
665 "of base library DLL") \
666 \
667 develop(bool, InlineNatives, true, \
668 "inline natives that are known to be part of base library DLL") \
669 \
670 develop(bool, InlineMathNatives, true, \
671 "inline SinD, CosD, etc.") \
672 \
673 develop(bool, InlineClassNatives, true, \
674 "inline Class.isInstance, etc") \
675 \
676 develop(bool, InlineThreadNatives, true, \
677 "inline Thread.currentThread, etc") \
678 \
679 develop(bool, InlineUnsafeOps, true, \
680 "inline memory ops (native methods) from sun.misc.Unsafe") \
681 \
682 product(bool, CriticalJNINatives, true, \
683 "check for critical JNI entry points") \
684 \
685 notproduct(bool, StressCriticalJNINatives, false, \
686 "Exercise register saving code in critical natives") \
687 \
688 product(bool, UseSSE42Intrinsics, false, \
689 "SSE4.2 versions of intrinsics") \
690 \
691 product(bool, UseAESIntrinsics, false, \
692 "use intrinsics for AES versions of crypto") \
693 \
694 product(bool, UseCRC32Intrinsics, false, \
695 "use intrinsics for java.util.zip.CRC32") \
696 \
697 develop(bool, TraceCallFixup, false, \
698 "traces all call fixups") \
699 \
700 develop(bool, DeoptimizeALot, false, \
701 "deoptimize at every exit from the runtime system") \
702 \
703 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
704 "a comma separated list of bcis to deoptimize at") \
705 \
706 product(bool, DeoptimizeRandom, false, \
707 "deoptimize random frames on random exit from the runtime system")\
708 \
709 notproduct(bool, ZombieALot, false, \
710 "creates zombies (non-entrant) at exit from the runt. system") \
711 \
712 product(bool, UnlinkSymbolsALot, false, \
713 "unlink unreferenced symbols from the symbol table at safepoints")\
714 \
715 notproduct(bool, WalkStackALot, false, \
716 "trace stack (no print) at every exit from the runtime system") \
717 \
718 product(bool, Debugging, false, \
719 "set when executing debug methods in debug.ccp " \
720 "(to prevent triggering assertions)") \
721 \
722 notproduct(bool, StrictSafepointChecks, trueInDebug, \
723 "Enable strict checks that safepoints cannot happen for threads " \
724 "that used No_Safepoint_Verifier") \
725 \
726 notproduct(bool, VerifyLastFrame, false, \
727 "Verify oops on last frame on entry to VM") \
728 \
729 develop(bool, TraceHandleAllocation, false, \
730 "Prints out warnings when suspicious many handles are allocated") \
731 \
732 product(bool, UseCompilerSafepoints, true, \
733 "Stop at safepoints in compiled code") \
734 \
735 product(bool, FailOverToOldVerifier, true, \
736 "fail over to old verifier when split verifier fails") \
737 \
738 develop(bool, ShowSafepointMsgs, false, \
739 "Show msg. about safepoint synch.") \
740 \
741 product(bool, SafepointTimeout, false, \
742 "Time out and warn or fail after SafepointTimeoutDelay " \
743 "milliseconds if failed to reach safepoint") \
744 \
745 develop(bool, DieOnSafepointTimeout, false, \
746 "Die upon failure to reach safepoint (see SafepointTimeout)") \
747 \
748 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
749 /* typically, at most a few retries are needed */ \
750 product(intx, SuspendRetryCount, 50, \
751 "Maximum retry count for an external suspend request") \
752 \
753 product(intx, SuspendRetryDelay, 5, \
754 "Milliseconds to delay per retry (* current_retry_count)") \
755 \
756 product(bool, AssertOnSuspendWaitFailure, false, \
757 "Assert/Guarantee on external suspend wait failure") \
758 \
759 product(bool, TraceSuspendWaitFailures, false, \
760 "Trace external suspend wait failures") \
761 \
762 product(bool, MaxFDLimit, true, \
763 "Bump the number of file descriptors to max in solaris.") \
764 \
765 diagnostic(bool, LogEvents, true, \
766 "Enable the various ring buffer event logs") \
767 \
768 diagnostic(uintx, LogEventsBufferEntries, 10, \
769 "Enable the various ring buffer event logs") \
770 \
771 product(bool, BytecodeVerificationRemote, true, \
772 "Enables the Java bytecode verifier for remote classes") \
773 \
774 product(bool, BytecodeVerificationLocal, false, \
775 "Enables the Java bytecode verifier for local classes") \
776 \
777 develop(bool, ForceFloatExceptions, trueInDebug, \
778 "Force exceptions on FP stack under/overflow") \
779 \
780 develop(bool, VerifyStackAtCalls, false, \
781 "Verify that the stack pointer is unchanged after calls") \
782 \
783 develop(bool, TraceJavaAssertions, false, \
784 "Trace java language assertions") \
785 \
786 notproduct(bool, CheckAssertionStatusDirectives, false, \
787 "temporary - see javaClasses.cpp") \
788 \
789 notproduct(bool, PrintMallocFree, false, \
790 "Trace calls to C heap malloc/free allocation") \
791 \
792 product(bool, PrintOopAddress, false, \
793 "Always print the location of the oop") \
794 \
795 notproduct(bool, VerifyCodeCacheOften, false, \
796 "Verify compiled-code cache often") \
797 \
798 develop(bool, ZapDeadCompiledLocals, false, \
799 "Zap dead locals in compiler frames") \
800 \
801 notproduct(bool, ZapDeadLocalsOld, false, \
802 "Zap dead locals (old version, zaps all frames when " \
803 "entering the VM") \
804 \
805 notproduct(bool, CheckOopishValues, false, \
806 "Warn if value contains oop ( requires ZapDeadLocals)") \
807 \
808 develop(bool, UseMallocOnly, false, \
809 "use only malloc/free for allocation (no resource area/arena)") \
810 \
811 develop(bool, PrintMalloc, false, \
812 "print all malloc/free calls") \
813 \
814 develop(bool, PrintMallocStatistics, false, \
815 "print malloc/free statistics") \
816 \
817 develop(bool, ZapResourceArea, trueInDebug, \
818 "Zap freed resource/arena space with 0xABABABAB") \
819 \
820 notproduct(bool, ZapVMHandleArea, trueInDebug, \
821 "Zap freed VM handle space with 0xBCBCBCBC") \
822 \
823 develop(bool, ZapJNIHandleArea, trueInDebug, \
824 "Zap freed JNI handle space with 0xFEFEFEFE") \
825 \
826 notproduct(bool, ZapStackSegments, trueInDebug, \
827 "Zap allocated/freed Stack segments with 0xFADFADED") \
828 \
829 develop(bool, ZapUnusedHeapArea, trueInDebug, \
830 "Zap unused heap space with 0xBAADBABE") \
831 \
832 develop(bool, TraceZapUnusedHeapArea, false, \
833 "Trace zapping of unused heap space") \
834 \
835 develop(bool, CheckZapUnusedHeapArea, false, \
836 "Check zapping of unused heap space") \
837 \
838 develop(bool, ZapFillerObjects, trueInDebug, \
839 "Zap filler objects with 0xDEAFBABE") \
840 \
841 develop(bool, PrintVMMessages, true, \
842 "Print vm messages on console") \
843 \
844 product(bool, PrintGCApplicationConcurrentTime, false, \
845 "Print the time the application has been running") \
846 \
847 product(bool, PrintGCApplicationStoppedTime, false, \
848 "Print the time the application has been stopped") \
849 \
850 diagnostic(bool, VerboseVerification, false, \
851 "Display detailed verification details") \
852 \
853 notproduct(uintx, ErrorHandlerTest, 0, \
854 "If > 0, provokes an error after VM initialization; the value" \
855 "determines which error to provoke. See test_error_handler()" \
856 "in debug.cpp.") \
857 \
858 develop(bool, Verbose, false, \
859 "Prints additional debugging information from other modes") \
860 \
861 develop(bool, PrintMiscellaneous, false, \
862 "Prints uncategorized debugging information (requires +Verbose)") \
863 \
864 develop(bool, WizardMode, false, \
865 "Prints much more debugging information") \
866 \
867 product(bool, ShowMessageBoxOnError, false, \
868 "Keep process alive on VM fatal error") \
869 \
870 product(bool, CreateMinidumpOnCrash, false, \
871 "Create minidump on VM fatal error") \
872 \
873 product_pd(bool, UseOSErrorReporting, \
874 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
875 \
876 product(bool, SuppressFatalErrorMessage, false, \
877 "Do NO Fatal Error report [Avoid deadlock]") \
878 \
879 product(ccstrlist, OnError, "", \
880 "Run user-defined commands on fatal error; see VMError.cpp " \
881 "for examples") \
882 \
883 product(ccstrlist, OnOutOfMemoryError, "", \
884 "Run user-defined commands on first java.lang.OutOfMemoryError") \
885 \
886 manageable(bool, HeapDumpBeforeFullGC, false, \
887 "Dump heap to file before any major stop-world GC") \
888 \
889 manageable(bool, HeapDumpAfterFullGC, false, \
890 "Dump heap to file after any major stop-world GC") \
891 \
892 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
893 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
894 \
895 manageable(ccstr, HeapDumpPath, NULL, \
896 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \
897 "directory) of the dump file (defaults to java_pid<pid>.hprof" \
898 "in the working directory)") \
899 \
900 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
901 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
902 "when the heap usage is larger than this") \
903 \
904 develop(uintx, HeapDumpSegmentSize, 1*G, \
905 "Approximate segment size when generating a segmented heap dump") \
906 \
907 develop(bool, BreakAtWarning, false, \
908 "Execute breakpoint upon encountering VM warning") \
909 \
910 develop(bool, TraceVMOperation, false, \
911 "Trace vm operations") \
912 \
913 develop(bool, UseFakeTimers, false, \
914 "Tells whether the VM should use system time or a fake timer") \
915 \
916 product(ccstr, NativeMemoryTracking, "off", \
917 "Native memory tracking options") \
918 \
919 diagnostic(bool, PrintNMTStatistics, false, \
920 "Print native memory tracking summary data if it is on") \
921 \
922 diagnostic(bool, AutoShutdownNMT, true, \
923 "Automatically shutdown native memory tracking under stress " \
924 "situation. When set to false, native memory tracking tries to " \
925 "stay alive at the expense of JVM performance") \
926 \
927 diagnostic(bool, LogCompilation, false, \
928 "Log compilation activity in detail to LogFile") \
929 \
930 product(bool, PrintCompilation, false, \
931 "Print compilations") \
932 \
933 diagnostic(bool, TraceNMethodInstalls, false, \
934 "Trace nmethod intallation") \
935 \
936 diagnostic(intx, ScavengeRootsInCode, 2, \
937 "0: do not allow scavengable oops in the code cache; " \
938 "1: allow scavenging from the code cache; " \
939 "2: emit as many constants as the compiler can see") \
940 \
941 product(bool, AlwaysRestoreFPU, false, \
942 "Restore the FPU control word after every JNI call (expensive)") \
943 \
944 diagnostic(bool, PrintCompilation2, false, \
945 "Print additional statistics per compilation") \
946 \
947 diagnostic(bool, PrintAdapterHandlers, false, \
948 "Print code generated for i2c/c2i adapters") \
949 \
950 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
951 "Verify that i2c/c2i adapters are called properly") \
952 \
953 develop(bool, VerifyAdapterSharing, false, \
954 "Verify that the code for shared adapters is the equivalent") \
955 \
956 diagnostic(bool, PrintAssembly, false, \
957 "Print assembly code (using external disassembler.so)") \
958 \
959 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
960 "Options string passed to disassembler.so") \
961 \
962 diagnostic(bool, PrintNMethods, false, \
963 "Print assembly code for nmethods when generated") \
964 \
965 diagnostic(bool, PrintNativeNMethods, false, \
966 "Print assembly code for native nmethods when generated") \
967 \
968 develop(bool, PrintDebugInfo, false, \
969 "Print debug information for all nmethods when generated") \
970 \
971 develop(bool, PrintRelocations, false, \
972 "Print relocation information for all nmethods when generated") \
973 \
974 develop(bool, PrintDependencies, false, \
975 "Print dependency information for all nmethods when generated") \
976 \
977 develop(bool, PrintExceptionHandlers, false, \
978 "Print exception handler tables for all nmethods when generated") \
979 \
980 develop(bool, StressCompiledExceptionHandlers, false, \
981 "Exercise compiled exception handlers") \
982 \
983 develop(bool, InterceptOSException, false, \
984 "Starts debugger when an implicit OS (e.g., NULL) " \
985 "exception happens") \
986 \
987 product(bool, PrintCodeCache, false, \
988 "Print the code cache memory usage when exiting") \
989 \
990 develop(bool, PrintCodeCache2, false, \
991 "Print detailed usage info on the code cache when exiting") \
992 \
993 product(bool, PrintCodeCacheOnCompilation, false, \
994 "Print the code cache memory usage each time a method is compiled") \
995 \
996 diagnostic(bool, PrintStubCode, false, \
997 "Print generated stub code") \
998 \
999 product(bool, StackTraceInThrowable, true, \
1000 "Collect backtrace in throwable when exception happens") \
1001 \
1002 product(bool, OmitStackTraceInFastThrow, true, \
1003 "Omit backtraces for some 'hot' exceptions in optimized code") \
1004 \
1005 product(bool, ProfilerPrintByteCodeStatistics, false, \
1006 "Prints byte code statictics when dumping profiler output") \
1007 \
1008 product(bool, ProfilerRecordPC, false, \
1009 "Collects tick for each 16 byte interval of compiled code") \
1010 \
1011 product(bool, ProfileVM, false, \
1012 "Profiles ticks that fall within VM (either in the VM Thread " \
1013 "or VM code called through stubs)") \
1014 \
1015 product(bool, ProfileIntervals, false, \
1016 "Prints profiles for each interval (see ProfileIntervalsTicks)") \
1017 \
1018 notproduct(bool, ProfilerCheckIntervals, false, \
1019 "Collect and print info on spacing of profiler ticks") \
1020 \
1021 develop(bool, PrintJVMWarnings, false, \
1022 "Prints warnings for unimplemented JVM functions") \
1023 \
1024 product(bool, PrintWarnings, true, \
1025 "Prints JVM warnings to output stream") \
1026 \
1027 notproduct(uintx, WarnOnStalledSpinLock, 0, \
1028 "Prints warnings for stalled SpinLocks") \
1029 \
1030 product(bool, RegisterFinalizersAtInit, true, \
1031 "Register finalizable objects at end of Object.<init> or " \
1032 "after allocation") \
1033 \
1034 develop(bool, RegisterReferences, true, \
1035 "Tells whether the VM should register soft/weak/final/phantom " \
1036 "references") \
1037 \
1038 develop(bool, IgnoreRewrites, false, \
1039 "Supress rewrites of bytecodes in the oopmap generator. " \
1040 "This is unsafe!") \
1041 \
1042 develop(bool, PrintCodeCacheExtension, false, \
1043 "Print extension of code cache") \
1044 \
1045 develop(bool, UsePrivilegedStack, true, \
1046 "Enable the security JVM functions") \
1047 \
1048 develop(bool, ProtectionDomainVerification, true, \
1049 "Verifies protection domain before resolution in system " \
1050 "dictionary") \
1051 \
1052 product(bool, ClassUnloading, true, \
1053 "Do unloading of classes") \
1054 \
1055 develop(bool, DisableStartThread, false, \
1056 "Disable starting of additional Java threads " \
1057 "(for debugging only)") \
1058 \
1059 develop(bool, MemProfiling, false, \
1060 "Write memory usage profiling to log file") \
1061 \
1062 notproduct(bool, PrintSystemDictionaryAtExit, false, \
1063 "Prints the system dictionary at exit") \
1064 \
1065 experimental(intx, PredictedLoadedClassCount, 0, \
1066 "Experimental: Tune loaded class cache starting size.") \
1067 \
1068 diagnostic(bool, UnsyncloadClass, false, \
1069 "Unstable: VM calls loadClass unsynchronized. Custom " \
1070 "class loader must call VM synchronized for findClass " \
1071 "and defineClass.") \
1072 \
1073 product(bool, AlwaysLockClassLoader, false, \
1074 "Require the VM to acquire the class loader lock before calling " \
1075 "loadClass() even for class loaders registering " \
1076 "as parallel capable") \
1077 \
1078 product(bool, AllowParallelDefineClass, false, \
1079 "Allow parallel defineClass requests for class loaders " \
1080 "registering as parallel capable") \
1081 \
1082 product(bool, MustCallLoadClassInternal, false, \
1083 "Call loadClassInternal() rather than loadClass()") \
1084 \
1085 product_pd(bool, DontYieldALot, \
1086 "Throw away obvious excess yield calls (for SOLARIS only)") \
1087 \
1088 product_pd(bool, ConvertSleepToYield, \
1089 "Converts sleep(0) to thread yield " \
1090 "(may be off for SOLARIS to improve GUI)") \
1091 \
1092 product(bool, ConvertYieldToSleep, false, \
1093 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1094 "behavior (SOLARIS only)") \
1095 \
1096 product(bool, UseBoundThreads, true, \
1097 "Bind user level threads to kernel threads (for SOLARIS only)") \
1098 \
1099 develop(bool, UseDetachedThreads, true, \
1100 "Use detached threads that are recycled upon termination " \
1101 "(for SOLARIS only)") \
1102 \
1103 product(bool, UseLWPSynchronization, true, \
1104 "Use LWP-based instead of libthread-based synchronization " \
1105 "(SPARC only)") \
1106 \
1107 product(ccstr, SyncKnobs, NULL, \
1108 "(Unstable) Various monitor synchronization tunables") \
1109 \
1110 product(intx, EmitSync, 0, \
1111 "(Unsafe,Unstable) " \
1112 " Controls emission of inline sync fast-path code") \
1113 \
1114 product(intx, MonitorBound, 0, "Bound Monitor population") \
1115 \
1116 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
1117 \
1118 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1119 \
1120 product(intx, SyncVerbose, 0, "(Unstable)" ) \
1121 \
1122 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \
1123 \
1124 product(intx, hashCode, 5, \
1125 "(Unstable) select hashCode generation algorithm" ) \
1126 \
1127 product(intx, WorkAroundNPTLTimedWaitHang, 1, \
1128 "(Unstable, Linux-specific)" \
1129 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \
1130 \
1131 product(bool, FilterSpuriousWakeups, true, \
1132 "Prevent spurious or premature wakeups from object.wait " \
1133 "(Solaris only)") \
1134 \
1135 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \
1136 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \
1137 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \
1138 \
1139 develop(bool, UsePthreads, false, \
1140 "Use pthread-based instead of libthread-based synchronization " \
1141 "(SPARC only)") \
1142 \
1143 product(bool, AdjustConcurrency, false, \
1144 "call thr_setconcurrency at thread create time to avoid " \
1145 "LWP starvation on MP systems (For Solaris Only)") \
1146 \
1147 product(bool, ReduceSignalUsage, false, \
1148 "Reduce the use of OS signals in Java and/or the VM") \
1149 \
1150 develop_pd(bool, ShareVtableStubs, \
1151 "Share vtable stubs (smaller code but worse branch prediction") \
1152 \
1153 develop(bool, LoadLineNumberTables, true, \
1154 "Tells whether the class file parser loads line number tables") \
1155 \
1156 develop(bool, LoadLocalVariableTables, true, \
1157 "Tells whether the class file parser loads local variable tables")\
1158 \
1159 develop(bool, LoadLocalVariableTypeTables, true, \
1160 "Tells whether the class file parser loads local variable type tables")\
1161 \
1162 product(bool, AllowUserSignalHandlers, false, \
1163 "Do not complain if the application installs signal handlers " \
1164 "(Solaris & Linux only)") \
1165 \
1166 product(bool, UseSignalChaining, true, \
1167 "Use signal-chaining to invoke signal handlers installed " \
1168 "by the application (Solaris & Linux only)") \
1169 \
1170 product(bool, UseAltSigs, false, \
1171 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
1172 "internal signals (Solaris only)") \
1173 \
1174 product(bool, AllowJNIEnvProxy, false, \
1175 "Allow JNIEnv proxies for jdbx") \
1176 \
1177 product(bool, JNIDetachReleasesMonitors, true, \
1178 "JNI DetachCurrentThread releases monitors owned by thread") \
1179 \
1180 product(bool, RestoreMXCSROnJNICalls, false, \
1181 "Restore MXCSR when returning from JNI calls") \
1182 \
1183 product(bool, CheckJNICalls, false, \
1184 "Verify all arguments to JNI calls") \
1185 \
1186 product(bool, UseFastJNIAccessors, true, \
1187 "Use optimized versions of Get<Primitive>Field") \
1188 \
1189 product(bool, EagerXrunInit, false, \
1190 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
1191 " but not all -Xrun libraries may support the state of the VM at this time") \
1192 \
1193 product(bool, PreserveAllAnnotations, false, \
1194 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1195 \
1196 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
1197 "Number of OutOfMemoryErrors preallocated with backtrace") \
1198 \
1199 product(bool, LazyBootClassLoader, true, \
1200 "Enable/disable lazy opening of boot class path entries") \
1201 \
1202 product(bool, UseXMMForArrayCopy, false, \
1203 "Use SSE2 MOVQ instruction for Arraycopy") \
1204 \
1205 product(intx, FieldsAllocationStyle, 1, \
1206 "0 - type based with oops first, 1 - with oops last, " \
1207 "2 - oops in super and sub classes are together") \
1208 \
1209 product(bool, CompactFields, true, \
1210 "Allocate nonstatic fields in gaps between previous fields") \
1211 \
1212 notproduct(bool, PrintFieldLayout, false, \
1213 "Print field layout for each class") \
1214 \
1215 product(intx, ContendedPaddingWidth, 128, \
1216 "How many bytes to pad the fields/classes marked @Contended with")\
1217 \
1218 product(bool, EnableContended, true, \
1219 "Enable @Contended annotation support") \
1220 \
1221 product(bool, RestrictContended, true, \
1222 "Restrict @Contended to trusted classes") \
1223 \
1224 product(bool, UseBiasedLocking, true, \
1225 "Enable biased locking in JVM") \
1226 \
1227 product(intx, BiasedLockingStartupDelay, 4000, \
1228 "Number of milliseconds to wait before enabling biased locking") \
1229 \
1230 diagnostic(bool, PrintBiasedLockingStatistics, false, \
1231 "Print statistics of biased locking in JVM") \
1232 \
1233 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
1234 "Threshold of number of revocations per type to try to " \
1235 "rebias all objects in the heap of that type") \
1236 \
1237 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
1238 "Threshold of number of revocations per type to permanently " \
1239 "revoke biases of all objects in the heap of that type") \
1240 \
1241 product(intx, BiasedLockingDecayTime, 25000, \
1242 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
1243 "type after previous bulk rebias") \
1244 \
1245 /* tracing */ \
1246 \
1247 notproduct(bool, TraceRuntimeCalls, false, \
1248 "Trace run-time calls") \
1249 \
1250 develop(bool, TraceJNICalls, false, \
1251 "Trace JNI calls") \
1252 \
1253 notproduct(bool, TraceJVMCalls, false, \
1254 "Trace JVM calls") \
1255 \
1256 product(ccstr, TraceJVMTI, NULL, \
1257 "Trace flags for JVMTI functions and events") \
1258 \
1259 /* This option can change an EMCP method into an obsolete method. */ \
1260 /* This can affect tests that except specific methods to be EMCP. */ \
1261 /* This option should be used with caution. */ \
1262 product(bool, StressLdcRewrite, false, \
1263 "Force ldc -> ldc_w rewrite during RedefineClasses") \
1264 \
1265 product(intx, TraceRedefineClasses, 0, \
1266 "Trace level for JVMTI RedefineClasses") \
1267 \
1268 develop(bool, StressMethodComparator, false, \
1269 "run the MethodComparator on all loaded methods") \
1270 \
1271 /* change to false by default sometime after Mustang */ \
1272 product(bool, VerifyMergedCPBytecodes, true, \
1273 "Verify bytecodes after RedefineClasses constant pool merging") \
1274 \
1275 develop(bool, TraceJNIHandleAllocation, false, \
1276 "Trace allocation/deallocation of JNI handle blocks") \
1277 \
1278 develop(bool, TraceThreadEvents, false, \
1279 "Trace all thread events") \
1280 \
1281 develop(bool, TraceBytecodes, false, \
1282 "Trace bytecode execution") \
1283 \
1284 develop(bool, TraceClassInitialization, false, \
1285 "Trace class initialization") \
1286 \
1287 develop(bool, TraceExceptions, false, \
1288 "Trace exceptions") \
1289 \
1290 develop(bool, TraceICs, false, \
1291 "Trace inline cache changes") \
1292 \
1293 notproduct(bool, TraceInvocationCounterOverflow, false, \
1294 "Trace method invocation counter overflow") \
1295 \
1296 develop(bool, TraceInlineCacheClearing, false, \
1297 "Trace clearing of inline caches in nmethods") \
1298 \
1299 develop(bool, TraceDependencies, false, \
1300 "Trace dependencies") \
1301 \
1302 develop(bool, VerifyDependencies, trueInDebug, \
1303 "Exercise and verify the compilation dependency mechanism") \
1304 \
1305 develop(bool, TraceNewOopMapGeneration, false, \
1306 "Trace OopMapGeneration") \
1307 \
1308 develop(bool, TraceNewOopMapGenerationDetailed, false, \
1309 "Trace OopMapGeneration: print detailed cell states") \
1310 \
1311 develop(bool, TimeOopMap, false, \
1312 "Time calls to GenerateOopMap::compute_map() in sum") \
1313 \
1314 develop(bool, TimeOopMap2, false, \
1315 "Time calls to GenerateOopMap::compute_map() individually") \
1316 \
1317 develop(bool, TraceMonitorMismatch, false, \
1318 "Trace monitor matching failures during OopMapGeneration") \
1319 \
1320 develop(bool, TraceOopMapRewrites, false, \
1321 "Trace rewritting of method oops during oop map generation") \
1322 \
1323 develop(bool, TraceSafepoint, false, \
1324 "Trace safepoint operations") \
1325 \
1326 develop(bool, TraceICBuffer, false, \
1327 "Trace usage of IC buffer") \
1328 \
1329 develop(bool, TraceCompiledIC, false, \
1330 "Trace changes of compiled IC") \
1331 \
1332 notproduct(bool, TraceZapDeadLocals, false, \
1333 "Trace zapping dead locals") \
1334 \
1335 develop(bool, TraceStartupTime, false, \
1336 "Trace setup time") \
1337 \
1338 develop(bool, TraceProtectionDomainVerification, false, \
1339 "Trace protection domain verifcation") \
1340 \
1341 develop(bool, TraceClearedExceptions, false, \
1342 "Prints when an exception is forcibly cleared") \
1343 \
1344 product(bool, TraceClassResolution, false, \
1345 "Trace all constant pool resolutions (for debugging)") \
1346 \
1347 product(bool, TraceBiasedLocking, false, \
1348 "Trace biased locking in JVM") \
1349 \
1350 product(bool, TraceMonitorInflation, false, \
1351 "Trace monitor inflation in JVM") \
1352 \
1353 /* gc */ \
1354 \
1355 product(bool, UseSerialGC, false, \
1356 "Use the serial garbage collector") \
1357 \
1358 product(bool, UseG1GC, false, \
1359 "Use the Garbage-First garbage collector") \
1360 \
1361 product(bool, UseParallelGC, false, \
1362 "Use the Parallel Scavenge garbage collector") \
1363 \
1364 product(bool, UseParallelOldGC, false, \
1365 "Use the Parallel Old garbage collector") \
1366 \
1367 product(uintx, HeapMaximumCompactionInterval, 20, \
1368 "How often should we maximally compact the heap (not allowing " \
1369 "any dead space)") \
1370 \
1371 product(uintx, HeapFirstMaximumCompactionCount, 3, \
1372 "The collection count for the first maximum compaction") \
1373 \
1374 product(bool, UseMaximumCompactionOnSystemGC, true, \
1375 "In the Parallel Old garbage collector maximum compaction for " \
1376 "a system GC") \
1377 \
1378 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
1379 "The mean used by the par compact dead wood" \
1380 "limiter (a number between 0-100).") \
1381 \
1382 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
1383 "The standard deviation used by the par compact dead wood" \
1384 "limiter (a number between 0-100).") \
1385 \
1386 product(uintx, ParallelGCThreads, 0, \
1387 "Number of parallel threads parallel gc will use") \
1388 \
1389 product(bool, UseDynamicNumberOfGCThreads, false, \
1390 "Dynamically choose the number of parallel threads " \
1391 "parallel gc will use") \
1392 \
1393 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
1394 "Force dynamic selection of the number of" \
1395 "parallel threads parallel gc will use to aid debugging") \
1396 \
1397 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
1398 "Size of heap (bytes) per GC thread used in calculating the " \
1399 "number of GC threads") \
1400 \
1401 product(bool, TraceDynamicGCThreads, false, \
1402 "Trace the dynamic GC thread usage") \
1403 \
1404 develop(bool, ParallelOldGCSplitALot, false, \
1405 "Provoke splitting (copying data from a young gen space to" \
1406 "multiple destination spaces)") \
1407 \
1408 develop(uintx, ParallelOldGCSplitInterval, 3, \
1409 "How often to provoke splitting a young gen space") \
1410 \
1411 product(uintx, ConcGCThreads, 0, \
1412 "Number of threads concurrent gc will use") \
1413 \
1414 product(uintx, YoungPLABSize, 4096, \
1415 "Size of young gen promotion labs (in HeapWords)") \
1416 \
1417 product(uintx, OldPLABSize, 1024, \
1418 "Size of old gen promotion labs (in HeapWords)") \
1419 \
1420 product(uintx, GCTaskTimeStampEntries, 200, \
1421 "Number of time stamp entries per gc worker thread") \
1422 \
1423 product(bool, AlwaysTenure, false, \
1424 "Always tenure objects in eden. (ParallelGC only)") \
1425 \
1426 product(bool, NeverTenure, false, \
1427 "Never tenure objects in eden, May tenure on overflow " \
1428 "(ParallelGC only)") \
1429 \
1430 product(bool, ScavengeBeforeFullGC, true, \
1431 "Scavenge youngest generation before each full GC, " \
1432 "used with UseParallelGC") \
1433 \
1434 develop(bool, ScavengeWithObjectsInToSpace, false, \
1435 "Allow scavenges to occur when to_space contains objects.") \
1436 \
1437 product(bool, UseConcMarkSweepGC, false, \
1438 "Use Concurrent Mark-Sweep GC in the old generation") \
1439 \
1440 product(bool, ExplicitGCInvokesConcurrent, false, \
1441 "A System.gc() request invokes a concurrent collection;" \
1442 " (effective only when UseConcMarkSweepGC)") \
1443 \
1444 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
1445 "A System.gc() request invokes a concurrent collection and " \
1446 "also unloads classes during such a concurrent gc cycle " \
1447 "(effective only when UseConcMarkSweepGC)") \
1448 \
1449 product(bool, GCLockerInvokesConcurrent, false, \
1450 "The exit of a JNI CS necessitating a scavenge also" \
1451 " kicks off a bkgrd concurrent collection") \
1452 \
1453 product(uintx, GCLockerEdenExpansionPercent, 5, \
1454 "How much the GC can expand the eden by while the GC locker " \
1455 "is active (as a percentage)") \
1456 \
1457 diagnostic(intx, GCLockerRetryAllocationCount, 2, \
1458 "Number of times to retry allocations when" \
1459 " blocked by the GC locker") \
1460 \
1461 develop(bool, UseCMSAdaptiveFreeLists, true, \
1462 "Use Adaptive Free Lists in the CMS generation") \
1463 \
1464 develop(bool, UseAsyncConcMarkSweepGC, true, \
1465 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1466 \
1467 develop(bool, RotateCMSCollectionTypes, false, \
1468 "Rotate the CMS collections among concurrent and STW") \
1469 \
1470 product(bool, UseCMSBestFit, true, \
1471 "Use CMS best fit allocation strategy") \
1472 \
1473 product(bool, UseCMSCollectionPassing, true, \
1474 "Use passing of collection from background to foreground") \
1475 \
1476 product(bool, UseParNewGC, false, \
1477 "Use parallel threads in the new generation.") \
1478 \
1479 product(bool, ParallelGCVerbose, false, \
1480 "Verbose output for parallel GC.") \
1481 \
1482 product(uintx, ParallelGCBufferWastePct, 10, \
1483 "Wasted fraction of parallel allocation buffer.") \
1484 \
1485 diagnostic(bool, ParallelGCRetainPLAB, false, \
1486 "Retain parallel allocation buffers across scavenges; " \
1487 " -- disabled because this currently conflicts with " \
1488 " parallel card scanning under certain conditions ") \
1489 \
1490 product(uintx, TargetPLABWastePct, 10, \
1491 "Target wasted space in last buffer as percent of overall " \
1492 "allocation") \
1493 \
1494 product(uintx, PLABWeight, 75, \
1495 "Percentage (0-100) used to weight the current sample when" \
1496 "computing exponentially decaying average for ResizePLAB.") \
1497 \
1498 product(bool, ResizePLAB, true, \
1499 "Dynamically resize (survivor space) promotion labs") \
1500 \
1501 product(bool, PrintPLAB, false, \
1502 "Print (survivor space) promotion labs sizing decisions") \
1503 \
1504 product(intx, ParGCArrayScanChunk, 50, \
1505 "Scan a subset and push remainder, if array is bigger than this") \
1506 \
1507 product(bool, ParGCUseLocalOverflow, false, \
1508 "Instead of a global overflow list, use local overflow stacks") \
1509 \
1510 product(bool, ParGCTrimOverflow, true, \
1511 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1512 \
1513 notproduct(bool, ParGCWorkQueueOverflowALot, false, \
1514 "Whether we should simulate work queue overflow in ParNew") \
1515 \
1516 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
1517 "An `interval' counter that determines how frequently " \
1518 "we simulate overflow; a smaller number increases frequency") \
1519 \
1520 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
1521 "The desired number of objects to claim from the overflow list") \
1522 \
1523 diagnostic(uintx, ParGCStridesPerThread, 2, \
1524 "The number of strides per worker thread that we divide up the " \
1525 "card table scanning work into") \
1526 \
1527 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
1528 "The number of cards in each chunk of the parallel chunks used " \
1529 "during card table scanning") \
1530 \
1531 product(uintx, CMSParPromoteBlocksToClaim, 16, \
1532 "Number of blocks to attempt to claim when refilling CMS LAB for "\
1533 "parallel GC.") \
1534 \
1535 product(uintx, OldPLABWeight, 50, \
1536 "Percentage (0-100) used to weight the current sample when" \
1537 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1538 \
1539 product(bool, ResizeOldPLAB, true, \
1540 "Dynamically resize (old gen) promotion labs") \
1541 \
1542 product(bool, PrintOldPLAB, false, \
1543 "Print (old gen) promotion labs sizing decisions") \
1544 \
1545 product(uintx, CMSOldPLABMin, 16, \
1546 "Min size of CMS gen promotion lab caches per worker per blksize")\
1547 \
1548 product(uintx, CMSOldPLABMax, 1024, \
1549 "Max size of CMS gen promotion lab caches per worker per blksize")\
1550 \
1551 product(uintx, CMSOldPLABNumRefills, 4, \
1552 "Nominal number of refills of CMS gen promotion lab cache" \
1553 " per worker per block size") \
1554 \
1555 product(bool, CMSOldPLABResizeQuicker, false, \
1556 "Whether to react on-the-fly during a scavenge to a sudden" \
1557 " change in block demand rate") \
1558 \
1559 product(uintx, CMSOldPLABToleranceFactor, 4, \
1560 "The tolerance of the phase-change detector for on-the-fly" \
1561 " PLAB resizing during a scavenge") \
1562 \
1563 product(uintx, CMSOldPLABReactivityFactor, 2, \
1564 "The gain in the feedback loop for on-the-fly PLAB resizing" \
1565 " during a scavenge") \
1566 \
1567 product(bool, AlwaysPreTouch, false, \
1568 "It forces all freshly committed pages to be pre-touched.") \
1569 \
1570 product_pd(uintx, CMSYoungGenPerWorker, \
1571 "The maximum size of young gen chosen by default per GC worker " \
1572 "thread available") \
1573 \
1574 product(bool, CMSIncrementalMode, false, \
1575 "Whether CMS GC should operate in \"incremental\" mode") \
1576 \
1577 product(uintx, CMSIncrementalDutyCycle, 10, \
1578 "CMS incremental mode duty cycle (a percentage, 0-100). If" \
1579 "CMSIncrementalPacing is enabled, then this is just the initial" \
1580 "value") \
1581 \
1582 product(bool, CMSIncrementalPacing, true, \
1583 "Whether the CMS incremental mode duty cycle should be " \
1584 "automatically adjusted") \
1585 \
1586 product(uintx, CMSIncrementalDutyCycleMin, 0, \
1587 "Lower bound on the duty cycle when CMSIncrementalPacing is " \
1588 "enabled (a percentage, 0-100)") \
1589 \
1590 product(uintx, CMSIncrementalSafetyFactor, 10, \
1591 "Percentage (0-100) used to add conservatism when computing the " \
1592 "duty cycle") \
1593 \
1594 product(uintx, CMSIncrementalOffset, 0, \
1595 "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1596 " is shifted to the right within the period between young GCs") \
1597 \
1598 product(uintx, CMSExpAvgFactor, 50, \
1599 "Percentage (0-100) used to weight the current sample when" \
1600 "computing exponential averages for CMS statistics.") \
1601 \
1602 product(uintx, CMS_FLSWeight, 75, \
1603 "Percentage (0-100) used to weight the current sample when" \
1604 "computing exponentially decating averages for CMS FLS statistics.") \
1605 \
1606 product(uintx, CMS_FLSPadding, 1, \
1607 "The multiple of deviation from mean to use for buffering" \
1608 "against volatility in free list demand.") \
1609 \
1610 product(uintx, FLSCoalescePolicy, 2, \
1611 "CMS: Aggression level for coalescing, increasing from 0 to 4") \
1612 \
1613 product(bool, FLSAlwaysCoalesceLarge, false, \
1614 "CMS: Larger free blocks are always available for coalescing") \
1615 \
1616 product(double, FLSLargestBlockCoalesceProximity, 0.99, \
1617 "CMS: the smaller the percentage the greater the coalition force")\
1618 \
1619 product(double, CMSSmallCoalSurplusPercent, 1.05, \
1620 "CMS: the factor by which to inflate estimated demand of small" \
1621 " block sizes to prevent coalescing with an adjoining block") \
1622 \
1623 product(double, CMSLargeCoalSurplusPercent, 0.95, \
1624 "CMS: the factor by which to inflate estimated demand of large" \
1625 " block sizes to prevent coalescing with an adjoining block") \
1626 \
1627 product(double, CMSSmallSplitSurplusPercent, 1.10, \
1628 "CMS: the factor by which to inflate estimated demand of small" \
1629 " block sizes to prevent splitting to supply demand for smaller" \
1630 " blocks") \
1631 \
1632 product(double, CMSLargeSplitSurplusPercent, 1.00, \
1633 "CMS: the factor by which to inflate estimated demand of large" \
1634 " block sizes to prevent splitting to supply demand for smaller" \
1635 " blocks") \
1636 \
1637 product(bool, CMSExtrapolateSweep, false, \
1638 "CMS: cushion for block demand during sweep") \
1639 \
1640 product(uintx, CMS_SweepWeight, 75, \
1641 "Percentage (0-100) used to weight the current sample when " \
1642 "computing exponentially decaying average for inter-sweep " \
1643 "duration") \
1644 \
1645 product(uintx, CMS_SweepPadding, 1, \
1646 "The multiple of deviation from mean to use for buffering " \
1647 "against volatility in inter-sweep duration.") \
1648 \
1649 product(uintx, CMS_SweepTimerThresholdMillis, 10, \
1650 "Skip block flux-rate sampling for an epoch unless inter-sweep " \
1651 "duration exceeds this threhold in milliseconds") \
1652 \
1653 develop(bool, CMSTraceIncrementalMode, false, \
1654 "Trace CMS incremental mode") \
1655 \
1656 develop(bool, CMSTraceIncrementalPacing, false, \
1657 "Trace CMS incremental mode pacing computation") \
1658 \
1659 develop(bool, CMSTraceThreadState, false, \
1660 "Trace the CMS thread state (enable the trace_state() method)") \
1661 \
1662 product(bool, CMSClassUnloadingEnabled, true, \
1663 "Whether class unloading enabled when using CMS GC") \
1664 \
1665 product(uintx, CMSClassUnloadingMaxInterval, 0, \
1666 "When CMS class unloading is enabled, the maximum CMS cycle count"\
1667 " for which classes may not be unloaded") \
1668 \
1669 product(bool, CMSCompactWhenClearAllSoftRefs, true, \
1670 "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1671 \
1672 product(bool, UseCMSCompactAtFullCollection, true, \
1673 "Use mark sweep compact at full collections") \
1674 \
1675 product(uintx, CMSFullGCsBeforeCompaction, 0, \
1676 "Number of CMS full collection done before compaction if > 0") \
1677 \
1678 develop(intx, CMSDictionaryChoice, 0, \
1679 "Use BinaryTreeDictionary as default in the CMS generation") \
1680 \
1681 product(uintx, CMSIndexedFreeListReplenish, 4, \
1682 "Replenish an indexed free list with this number of chunks") \
1683 \
1684 product(bool, CMSReplenishIntermediate, true, \
1685 "Replenish all intermediate free-list caches") \
1686 \
1687 product(bool, CMSSplitIndexedFreeListBlocks, true, \
1688 "When satisfying batched demand, split blocks from the " \
1689 "IndexedFreeList whose size is a multiple of requested size") \
1690 \
1691 product(bool, CMSLoopWarn, false, \
1692 "Warn in case of excessive CMS looping") \
1693 \
1694 develop(bool, CMSOverflowEarlyRestoration, false, \
1695 "Whether preserved marks should be restored early") \
1696 \
1697 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
1698 "Size of marking stack") \
1699 \
1700 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
1701 "Max size of marking stack") \
1702 \
1703 notproduct(bool, CMSMarkStackOverflowALot, false, \
1704 "Whether we should simulate frequent marking stack / work queue" \
1705 " overflow") \
1706 \
1707 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
1708 "An `interval' counter that determines how frequently" \
1709 " we simulate overflow; a smaller number increases frequency") \
1710 \
1711 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
1712 "(Temporary, subject to experimentation)" \
1713 "Maximum number of abortable preclean iterations, if > 0") \
1714 \
1715 product(intx, CMSMaxAbortablePrecleanTime, 5000, \
1716 "(Temporary, subject to experimentation)" \
1717 "Maximum time in abortable preclean in ms") \
1718 \
1719 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
1720 "(Temporary, subject to experimentation)" \
1721 "Nominal minimum work per abortable preclean iteration") \
1722 \
1723 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
1724 "(Temporary, subject to experimentation)" \
1725 " Time that we sleep between iterations when not given" \
1726 " enough work per iteration") \
1727 \
1728 product(uintx, CMSRescanMultiple, 32, \
1729 "Size (in cards) of CMS parallel rescan task") \
1730 \
1731 product(uintx, CMSConcMarkMultiple, 32, \
1732 "Size (in cards) of CMS concurrent MT marking task") \
1733 \
1734 product(bool, CMSAbortSemantics, false, \
1735 "Whether abort-on-overflow semantics is implemented") \
1736 \
1737 product(bool, CMSParallelInitialMarkEnabled, true, \
1738 "Use the parallel initial mark.") \
1739 \
1740 product(bool, CMSParallelRemarkEnabled, true, \
1741 "Whether parallel remark enabled (only if ParNewGC)") \
1742 \
1743 product(bool, CMSParallelSurvivorRemarkEnabled, true, \
1744 "Whether parallel remark of survivor space" \
1745 " enabled (effective only if CMSParallelRemarkEnabled)") \
1746 \
1747 product(bool, CMSPLABRecordAlways, true, \
1748 "Whether to always record survivor space PLAB bdries" \
1749 " (effective only if CMSParallelSurvivorRemarkEnabled)") \
1750 \
1751 product(bool, CMSEdenChunksRecordAlways, true, \
1752 "Whether to always record eden chunks used for " \
1753 "the parallel initial mark or remark of eden" ) \
1754 \
1755 product(bool, CMSPrintEdenSurvivorChunks, false, \
1756 "Print the eden and the survivor chunks used for the parallel " \
1757 "initial mark or remark of the eden/survivor spaces") \
1758 \
1759 product(bool, CMSConcurrentMTEnabled, true, \
1760 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \
1761 \
1762 product(bool, CMSPrecleaningEnabled, true, \
1763 "Whether concurrent precleaning enabled") \
1764 \
1765 product(uintx, CMSPrecleanIter, 3, \
1766 "Maximum number of precleaning iteration passes") \
1767 \
1768 product(uintx, CMSPrecleanNumerator, 2, \
1769 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1770 " ratio") \
1771 \
1772 product(uintx, CMSPrecleanDenominator, 3, \
1773 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \
1774 " ratio") \
1775 \
1776 product(bool, CMSPrecleanRefLists1, true, \
1777 "Preclean ref lists during (initial) preclean phase") \
1778 \
1779 product(bool, CMSPrecleanRefLists2, false, \
1780 "Preclean ref lists during abortable preclean phase") \
1781 \
1782 product(bool, CMSPrecleanSurvivors1, false, \
1783 "Preclean survivors during (initial) preclean phase") \
1784 \
1785 product(bool, CMSPrecleanSurvivors2, true, \
1786 "Preclean survivors during abortable preclean phase") \
1787 \
1788 product(uintx, CMSPrecleanThreshold, 1000, \
1789 "Don't re-iterate if #dirty cards less than this") \
1790 \
1791 product(bool, CMSCleanOnEnter, true, \
1792 "Clean-on-enter optimization for reducing number of dirty cards") \
1793 \
1794 product(uintx, CMSRemarkVerifyVariant, 1, \
1795 "Choose variant (1,2) of verification following remark") \
1796 \
1797 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
1798 "If Eden used is below this value, don't try to schedule remark") \
1799 \
1800 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
1801 "The Eden occupancy % at which to try and schedule remark pause") \
1802 \
1803 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
1804 "Start sampling Eden top at least before yg occupancy reaches" \
1805 " 1/<ratio> of the size at which we plan to schedule remark") \
1806 \
1807 product(uintx, CMSSamplingGrain, 16*K, \
1808 "The minimum distance between eden samples for CMS (see above)") \
1809 \
1810 product(bool, CMSScavengeBeforeRemark, false, \
1811 "Attempt scavenge before the CMS remark step") \
1812 \
1813 develop(bool, CMSTraceSweeper, false, \
1814 "Trace some actions of the CMS sweeper") \
1815 \
1816 product(uintx, CMSWorkQueueDrainThreshold, 10, \
1817 "Don't drain below this size per parallel worker/thief") \
1818 \
1819 manageable(intx, CMSWaitDuration, 2000, \
1820 "Time in milliseconds that CMS thread waits for young GC") \
1821 \
1822 develop(uintx, CMSCheckInterval, 1000, \
1823 "Interval in milliseconds that CMS thread checks if it " \
1824 "should start a collection cycle") \
1825 \
1826 product(bool, CMSYield, true, \
1827 "Yield between steps of concurrent mark & sweep") \
1828 \
1829 product(uintx, CMSBitMapYieldQuantum, 10*M, \
1830 "Bitmap operations should process at most this many bits" \
1831 "between yields") \
1832 \
1833 product(bool, CMSDumpAtPromotionFailure, false, \
1834 "Dump useful information about the state of the CMS old " \
1835 " generation upon a promotion failure.") \
1836 \
1837 product(bool, CMSPrintChunksInDump, false, \
1838 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1839 " more detailed information about the free chunks.") \
1840 \
1841 product(bool, CMSPrintObjectsInDump, false, \
1842 "In a dump enabled by CMSDumpAtPromotionFailure, include " \
1843 " more detailed information about the allocated objects.") \
1844 \
1845 diagnostic(bool, FLSVerifyAllHeapReferences, false, \
1846 "Verify that all refs across the FLS boundary " \
1847 " are to valid objects") \
1848 \
1849 diagnostic(bool, FLSVerifyLists, false, \
1850 "Do lots of (expensive) FreeListSpace verification") \
1851 \
1852 diagnostic(bool, FLSVerifyIndexTable, false, \
1853 "Do lots of (expensive) FLS index table verification") \
1854 \
1855 develop(bool, FLSVerifyDictionary, false, \
1856 "Do lots of (expensive) FLS dictionary verification") \
1857 \
1858 develop(bool, VerifyBlockOffsetArray, false, \
1859 "Do (expensive!) block offset array verification") \
1860 \
1861 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
1862 "Maintain _unallocated_block in BlockOffsetArray" \
1863 " (currently applicable only to CMS collector)") \
1864 \
1865 develop(bool, TraceCMSState, false, \
1866 "Trace the state of the CMS collection") \
1867 \
1868 product(intx, RefDiscoveryPolicy, 0, \
1869 "Whether reference-based(0) or referent-based(1)") \
1870 \
1871 product(bool, ParallelRefProcEnabled, false, \
1872 "Enable parallel reference processing whenever possible") \
1873 \
1874 product(bool, ParallelRefProcBalancingEnabled, true, \
1875 "Enable balancing of reference processing queues") \
1876 \
1877 product(uintx, CMSTriggerRatio, 80, \
1878 "Percentage of MinHeapFreeRatio in CMS generation that is " \
1879 "allocated before a CMS collection cycle commences") \
1880 \
1881 product(uintx, CMSBootstrapOccupancy, 50, \
1882 "Percentage CMS generation occupancy at which to " \
1883 "initiate CMS collection for bootstrapping collection stats") \
1884 \
1885 product(intx, CMSInitiatingOccupancyFraction, -1, \
1886 "Percentage CMS generation occupancy to start a CMS collection " \
1887 "cycle. A negative value means that CMSTriggerRatio is used") \
1888 \
1889 product(uintx, InitiatingHeapOccupancyPercent, 45, \
1890 "Percentage of the (entire) heap occupancy to start a " \
1891 "concurrent GC cycle. It is used by GCs that trigger a " \
1892 "concurrent GC cycle based on the occupancy of the entire heap, " \
1893 "not just one of the generations (e.g., G1). A value of 0 " \
1894 "denotes 'do constant GC cycles'.") \
1895 \
1896 product(bool, UseCMSInitiatingOccupancyOnly, false, \
1897 "Only use occupancy as a crierion for starting a CMS collection") \
1898 \
1899 product(uintx, CMSIsTooFullPercentage, 98, \
1900 "An absolute ceiling above which CMS will always consider the " \
1901 "unloading of classes when class unloading is enabled") \
1902 \
1903 develop(bool, CMSTestInFreeList, false, \
1904 "Check if the coalesced range is already in the " \
1905 "free lists as claimed") \
1906 \
1907 notproduct(bool, CMSVerifyReturnedBytes, false, \
1908 "Check that all the garbage collected was returned to the " \
1909 "free lists.") \
1910 \
1911 notproduct(bool, ScavengeALot, false, \
1912 "Force scavenge at every Nth exit from the runtime system " \
1913 "(N=ScavengeALotInterval)") \
1914 \
1915 develop(bool, FullGCALot, false, \
1916 "Force full gc at every Nth exit from the runtime system " \
1917 "(N=FullGCALotInterval)") \
1918 \
1919 notproduct(bool, GCALotAtAllSafepoints, false, \
1920 "Enforce ScavengeALot/GCALot at all potential safepoints") \
1921 \
1922 product(bool, PrintPromotionFailure, false, \
1923 "Print additional diagnostic information following " \
1924 " promotion failure") \
1925 \
1926 notproduct(bool, PromotionFailureALot, false, \
1927 "Use promotion failure handling on every youngest generation " \
1928 "collection") \
1929 \
1930 develop(uintx, PromotionFailureALotCount, 1000, \
1931 "Number of promotion failures occurring at ParGCAllocBuffer" \
1932 "refill attempts (ParNew) or promotion attempts " \
1933 "(other young collectors) ") \
1934 \
1935 develop(uintx, PromotionFailureALotInterval, 5, \
1936 "Total collections between promotion failures alot") \
1937 \
1938 experimental(uintx, WorkStealingSleepMillis, 1, \
1939 "Sleep time when sleep is used for yields") \
1940 \
1941 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
1942 "Number of yields before a sleep is done during workstealing") \
1943 \
1944 experimental(uintx, WorkStealingHardSpins, 4096, \
1945 "Number of iterations in a spin loop between checks on " \
1946 "time out of hard spin") \
1947 \
1948 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
1949 "Ratio of hard spins to calls to yield") \
1950 \
1951 develop(uintx, ObjArrayMarkingStride, 512, \
1952 "Number of ObjArray elements to push onto the marking stack" \
1953 "before pushing a continuation entry") \
1954 \
1955 develop(bool, MetadataAllocationFailALot, false, \
1956 "Fail metadata allocations at intervals controlled by " \
1957 "MetadataAllocationFailALotInterval") \
1958 \
1959 develop(uintx, MetadataAllocationFailALotInterval, 1000, \
1960 "metadata allocation failure alot interval") \
1961 \
1962 develop(bool, MetaDataDeallocateALot, false, \
1963 "Deallocation bunches of metadata at intervals controlled by " \
1964 "MetaDataAllocateALotInterval") \
1965 \
1966 develop(uintx, MetaDataDeallocateALotInterval, 100, \
1967 "Metadata deallocation alot interval") \
1968 \
1969 develop(bool, TraceMetadataChunkAllocation, false, \
1970 "Trace chunk metadata allocations") \
1971 \
1972 product(bool, TraceMetadataHumongousAllocation, false, \
1973 "Trace humongous metadata allocations") \
1974 \
1975 develop(bool, TraceMetavirtualspaceAllocation, false, \
1976 "Trace virtual space metadata allocations") \
1977 \
1978 notproduct(bool, ExecuteInternalVMTests, false, \
1979 "Enable execution of internal VM tests.") \
1980 \
1981 notproduct(bool, VerboseInternalVMTests, false, \
1982 "Turn on logging for internal VM tests.") \
1983 \
1984 product_pd(bool, UseTLAB, "Use thread-local object allocation") \
1985 \
1986 product_pd(bool, ResizeTLAB, \
1987 "Dynamically resize tlab size for threads") \
1988 \
1989 product(bool, ZeroTLAB, false, \
1990 "Zero out the newly created TLAB") \
1991 \
1992 product(bool, FastTLABRefill, true, \
1993 "Use fast TLAB refill code") \
1994 \
1995 product(bool, PrintTLAB, false, \
1996 "Print various TLAB related information") \
1997 \
1998 product(bool, TLABStats, true, \
1999 "Print various TLAB related information") \
2000 \
2001 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
2002 "Enable LowMemoryProtection")) \
2003 \
2004 product_pd(bool, NeverActAsServerClassMachine, \
2005 "Never act like a server-class machine") \
2006 \
2007 product(bool, AlwaysActAsServerClassMachine, false, \
2008 "Always act like a server-class machine") \
2009 \
2010 product_pd(uint64_t, MaxRAM, \
2011 "Real memory size (in bytes) used to set maximum heap size") \
2012 \
2013 product(uintx, ErgoHeapSizeLimit, 0, \
2014 "Maximum ergonomically set heap size (in bytes); zero means use " \
2015 "MaxRAM / MaxRAMFraction") \
2016 \
2017 product(uintx, MaxRAMFraction, 4, \
2018 "Maximum fraction (1/n) of real memory used for maximum heap " \
2019 "size") \
2020 \
2021 product(uintx, DefaultMaxRAMFraction, 4, \
2022 "Maximum fraction (1/n) of real memory used for maximum heap " \
2023 "size; deprecated: to be renamed to MaxRAMFraction") \
2024 \
2025 product(uintx, MinRAMFraction, 2, \
2026 "Minimum fraction (1/n) of real memory used for maxmimum heap " \
2027 "size on systems with small physical memory size") \
2028 \
2029 product(uintx, InitialRAMFraction, 64, \
2030 "Fraction (1/n) of real memory used for initial heap size") \
2031 \
2032 develop(uintx, MaxVirtMemFraction, 2, \
2033 "Maximum fraction (1/n) of virtual memory used for ergonomically" \
2034 "determining maximum heap size") \
2035 \
2036 product(bool, UseAutoGCSelectPolicy, false, \
2037 "Use automatic collection selection policy") \
2038 \
2039 product(uintx, AutoGCSelectPauseMillis, 5000, \
2040 "Automatic GC selection pause threshhold in ms") \
2041 \
2042 product(bool, UseAdaptiveSizePolicy, true, \
2043 "Use adaptive generation sizing policies") \
2044 \
2045 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
2046 "Use adaptive survivor sizing policies") \
2047 \
2048 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
2049 "Use adaptive young-old sizing policies at minor collections") \
2050 \
2051 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
2052 "Use adaptive young-old sizing policies at major collections") \
2053 \
2054 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
2055 "Use statistics from System.GC for adaptive size policy") \
2056 \
2057 product(bool, UseAdaptiveGCBoundary, false, \
2058 "Allow young-old boundary to move") \
2059 \
2060 develop(bool, TraceAdaptiveGCBoundary, false, \
2061 "Trace young-old boundary moves") \
2062 \
2063 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
2064 "Resize the virtual spaces of the young or old generations") \
2065 \
2066 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
2067 "Policy for changeing generation size for throughput goals") \
2068 \
2069 product(uintx, AdaptiveSizePausePolicy, 0, \
2070 "Policy for changing generation size for pause goals") \
2071 \
2072 develop(bool, PSAdjustTenuredGenForMinorPause, false, \
2073 "Adjust tenured generation to achive a minor pause goal") \
2074 \
2075 develop(bool, PSAdjustYoungGenForMajorPause, false, \
2076 "Adjust young generation to achive a major pause goal") \
2077 \
2078 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
2079 "Number of steps where heuristics is used before data is used") \
2080 \
2081 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
2082 "Number of collections before the adaptive sizing is started") \
2083 \
2084 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
2085 "Collection interval for printing information; zero means never") \
2086 \
2087 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
2088 "Use adaptive minimum footprint as a goal") \
2089 \
2090 product(uintx, AdaptiveSizePolicyWeight, 10, \
2091 "Weight given to exponential resizing, between 0 and 100") \
2092 \
2093 product(uintx, AdaptiveTimeWeight, 25, \
2094 "Weight given to time in adaptive policy, between 0 and 100") \
2095 \
2096 product(uintx, PausePadding, 1, \
2097 "How much buffer to keep for pause time") \
2098 \
2099 product(uintx, PromotedPadding, 3, \
2100 "How much buffer to keep for promotion failure") \
2101 \
2102 product(uintx, SurvivorPadding, 3, \
2103 "How much buffer to keep for survivor overflow") \
2104 \
2105 product(uintx, ThresholdTolerance, 10, \
2106 "Allowed collection cost difference between generations") \
2107 \
2108 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
2109 "If collection costs are within margin, reduce both by full " \
2110 "delta") \
2111 \
2112 product(uintx, YoungGenerationSizeIncrement, 20, \
2113 "Adaptive size percentage change in young generation") \
2114 \
2115 product(uintx, YoungGenerationSizeSupplement, 80, \
2116 "Supplement to YoungedGenerationSizeIncrement used at startup") \
2117 \
2118 product(uintx, YoungGenerationSizeSupplementDecay, 8, \
2119 "Decay factor to YoungedGenerationSizeSupplement") \
2120 \
2121 product(uintx, TenuredGenerationSizeIncrement, 20, \
2122 "Adaptive size percentage change in tenured generation") \
2123 \
2124 product(uintx, TenuredGenerationSizeSupplement, 80, \
2125 "Supplement to TenuredGenerationSizeIncrement used at startup") \
2126 \
2127 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
2128 "Decay factor to TenuredGenerationSizeIncrement") \
2129 \
2130 product(uintx, MaxGCPauseMillis, max_uintx, \
2131 "Adaptive size policy maximum GC pause time goal in msec, " \
2132 "or (G1 Only) the max. GC time per MMU time slice") \
2133 \
2134 product(uintx, GCPauseIntervalMillis, 0, \
2135 "Time slice for MMU specification") \
2136 \
2137 product(uintx, MaxGCMinorPauseMillis, max_uintx, \
2138 "Adaptive size policy maximum GC minor pause time goal in msec") \
2139 \
2140 product(uintx, GCTimeRatio, 99, \
2141 "Adaptive size policy application time to GC time ratio") \
2142 \
2143 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
2144 "Adaptive size scale down factor for shrinking") \
2145 \
2146 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
2147 "Adaptive size decays the major cost for long major intervals") \
2148 \
2149 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
2150 "Time scale over which major costs decay") \
2151 \
2152 product(uintx, MinSurvivorRatio, 3, \
2153 "Minimum ratio of young generation/survivor space size") \
2154 \
2155 product(uintx, InitialSurvivorRatio, 8, \
2156 "Initial ratio of eden/survivor space size") \
2157 \
2158 product(uintx, BaseFootPrintEstimate, 256*M, \
2159 "Estimate of footprint other than Java Heap") \
2160 \
2161 product(bool, UseGCOverheadLimit, true, \
2162 "Use policy to limit of proportion of time spent in GC " \
2163 "before an OutOfMemory error is thrown") \
2164 \
2165 product(uintx, GCTimeLimit, 98, \
2166 "Limit of proportion of time spent in GC before an OutOfMemory" \
2167 "error is thrown (used with GCHeapFreeLimit)") \
2168 \
2169 product(uintx, GCHeapFreeLimit, 2, \
2170 "Minimum percentage of free space after a full GC before an " \
2171 "OutOfMemoryError is thrown (used with GCTimeLimit)") \
2172 \
2173 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
2174 "Number of consecutive collections before gc time limit fires") \
2175 \
2176 product(bool, PrintAdaptiveSizePolicy, false, \
2177 "Print information about AdaptiveSizePolicy") \
2178 \
2179 product(intx, PrefetchCopyIntervalInBytes, -1, \
2180 "How far ahead to prefetch destination area (<= 0 means off)") \
2181 \
2182 product(intx, PrefetchScanIntervalInBytes, -1, \
2183 "How far ahead to prefetch scan area (<= 0 means off)") \
2184 \
2185 product(intx, PrefetchFieldsAhead, -1, \
2186 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2187 \
2188 diagnostic(bool, VerifySilently, false, \
2189 "Don't print print the verification progress") \
2190 \
2191 diagnostic(bool, VerifyDuringStartup, false, \
2192 "Verify memory system before executing any Java code " \
2193 "during VM initialization") \
2194 \
2195 diagnostic(bool, VerifyBeforeExit, trueInDebug, \
2196 "Verify system before exiting") \
2197 \
2198 diagnostic(bool, VerifyBeforeGC, false, \
2199 "Verify memory system before GC") \
2200 \
2201 diagnostic(bool, VerifyAfterGC, false, \
2202 "Verify memory system after GC") \
2203 \
2204 diagnostic(bool, VerifyDuringGC, false, \
2205 "Verify memory system during GC (between phases)") \
2206 \
2207 diagnostic(bool, GCParallelVerificationEnabled, true, \
2208 "Enable parallel memory system verification") \
2209 \
2210 diagnostic(bool, DeferInitialCardMark, false, \
2211 "When +ReduceInitialCardMarks, explicitly defer any that " \
2212 "may arise from new_pre_store_barrier") \
2213 \
2214 diagnostic(bool, VerifyRememberedSets, false, \
2215 "Verify GC remembered sets") \
2216 \
2217 diagnostic(bool, VerifyObjectStartArray, true, \
2218 "Verify GC object start array if verify before/after") \
2219 \
2220 product(bool, DisableExplicitGC, false, \
2221 "Tells whether calling System.gc() does a full GC") \
2222 \
2223 notproduct(bool, CheckMemoryInitialization, false, \
2224 "Checks memory initialization") \
2225 \
2226 product(bool, CollectGen0First, false, \
2227 "Collect youngest generation before each full GC") \
2228 \
2229 diagnostic(bool, BindCMSThreadToCPU, false, \
2230 "Bind CMS Thread to CPU if possible") \
2231 \
2232 diagnostic(uintx, CPUForCMSThread, 0, \
2233 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2234 \
2235 product(bool, BindGCTaskThreadsToCPUs, false, \
2236 "Bind GCTaskThreads to CPUs if possible") \
2237 \
2238 product(bool, UseGCTaskAffinity, false, \
2239 "Use worker affinity when asking for GCTasks") \
2240 \
2241 product(uintx, ProcessDistributionStride, 4, \
2242 "Stride through processors when distributing processes") \
2243 \
2244 product(uintx, CMSCoordinatorYieldSleepCount, 10, \
2245 "number of times the coordinator GC thread will sleep while " \
2246 "yielding before giving up and resuming GC") \
2247 \
2248 product(uintx, CMSYieldSleepCount, 0, \
2249 "number of times a GC thread (minus the coordinator) " \
2250 "will sleep while yielding before giving up and resuming GC") \
2251 \
2252 /* gc tracing */ \
2253 manageable(bool, PrintGC, false, \
2254 "Print message at garbage collect") \
2255 \
2256 manageable(bool, PrintGCDetails, false, \
2257 "Print more details at garbage collect") \
2258 \
2259 manageable(bool, PrintGCDateStamps, false, \
2260 "Print date stamps at garbage collect") \
2261 \
2262 manageable(bool, PrintGCTimeStamps, false, \
2263 "Print timestamps at garbage collect") \
2264 \
2265 product(bool, PrintGCTaskTimeStamps, false, \
2266 "Print timestamps for individual gc worker thread tasks") \
2267 \
2268 develop(intx, ConcGCYieldTimeout, 0, \
2269 "If non-zero, assert that GC threads yield within this # of ms.") \
2270 \
2271 notproduct(bool, TraceMarkSweep, false, \
2272 "Trace mark sweep") \
2273 \
2274 product(bool, PrintReferenceGC, false, \
2275 "Print times spent handling reference objects during GC " \
2276 " (enabled only when PrintGCDetails)") \
2277 \
2278 develop(bool, TraceReferenceGC, false, \
2279 "Trace handling of soft/weak/final/phantom references") \
2280 \
2281 develop(bool, TraceFinalizerRegistration, false, \
2282 "Trace registration of final references") \
2283 \
2284 notproduct(bool, TraceScavenge, false, \
2285 "Trace scavenge") \
2286 \
2287 product_rw(bool, TraceClassLoading, false, \
2288 "Trace all classes loaded") \
2289 \
2290 product(bool, TraceClassLoadingPreorder, false, \
2291 "Trace all classes loaded in order referenced (not loaded)") \
2292 \
2293 product_rw(bool, TraceClassUnloading, false, \
2294 "Trace unloading of classes") \
2295 \
2296 product_rw(bool, TraceLoaderConstraints, false, \
2297 "Trace loader constraints") \
2298 \
2299 develop(bool, TraceClassLoaderData, false, \
2300 "Trace class loader loader_data lifetime") \
2301 \
2302 product(uintx, InitialBootClassLoaderMetaspaceSize, \
2303 NOT_LP64(2200*K) LP64_ONLY(4*M), \
2304 "Initial size of the boot class loader data metaspace") \
2305 \
2306 product(bool, TraceGen0Time, false, \
2307 "Trace accumulated time for Gen 0 collection") \
2308 \
2309 product(bool, TraceGen1Time, false, \
2310 "Trace accumulated time for Gen 1 collection") \
2311 \
2312 product(bool, PrintTenuringDistribution, false, \
2313 "Print tenuring age information") \
2314 \
2315 product_rw(bool, PrintHeapAtGC, false, \
2316 "Print heap layout before and after each GC") \
2317 \
2318 product_rw(bool, PrintHeapAtGCExtended, false, \
2319 "Prints extended information about the layout of the heap " \
2320 "when -XX:+PrintHeapAtGC is set") \
2321 \
2322 product(bool, PrintHeapAtSIGBREAK, true, \
2323 "Print heap layout in response to SIGBREAK") \
2324 \
2325 manageable(bool, PrintClassHistogramBeforeFullGC, false, \
2326 "Print a class histogram before any major stop-world GC") \
2327 \
2328 manageable(bool, PrintClassHistogramAfterFullGC, false, \
2329 "Print a class histogram after any major stop-world GC") \
2330 \
2331 manageable(bool, PrintClassHistogram, false, \
2332 "Print a histogram of class instances") \
2333 \
2334 develop(bool, TraceWorkGang, false, \
2335 "Trace activities of work gangs") \
2336 \
2337 product(bool, TraceParallelOldGCTasks, false, \
2338 "Trace multithreaded GC activity") \
2339 \
2340 develop(bool, TraceBlockOffsetTable, false, \
2341 "Print BlockOffsetTable maps") \
2342 \
2343 develop(bool, TraceCardTableModRefBS, false, \
2344 "Print CardTableModRefBS maps") \
2345 \
2346 develop(bool, TraceGCTaskManager, false, \
2347 "Trace actions of the GC task manager") \
2348 \
2349 develop(bool, TraceGCTaskQueue, false, \
2350 "Trace actions of the GC task queues") \
2351 \
2352 diagnostic(bool, TraceGCTaskThread, false, \
2353 "Trace actions of the GC task threads") \
2354 \
2355 product(bool, PrintParallelOldGCPhaseTimes, false, \
2356 "Print the time taken by each parallel old gc phase." \
2357 "PrintGCDetails must also be enabled.") \
2358 \
2359 develop(bool, TraceParallelOldGCMarkingPhase, false, \
2360 "Trace parallel old gc marking phase") \
2361 \
2362 develop(bool, TraceParallelOldGCSummaryPhase, false, \
2363 "Trace parallel old gc summary phase") \
2364 \
2365 develop(bool, TraceParallelOldGCCompactionPhase, false, \
2366 "Trace parallel old gc compaction phase") \
2367 \
2368 develop(bool, TraceParallelOldGCDensePrefix, false, \
2369 "Trace parallel old gc dense prefix computation") \
2370 \
2371 develop(bool, IgnoreLibthreadGPFault, false, \
2372 "Suppress workaround for libthread GP fault") \
2373 \
2374 product(bool, PrintJNIGCStalls, false, \
2375 "Print diagnostic message when GC is stalled" \
2376 "by JNI critical section") \
2377 \
2378 experimental(double, ObjectCountCutOffPercent, 0.5, \
2379 "The percentage of the used heap that the instances of a class " \
2380 "must occupy for the class to generate a trace event.") \
2381 \
2382 /* GC log rotation setting */ \
2383 \
2384 product(bool, UseGCLogFileRotation, false, \
2385 "Prevent large gclog file for long running app. " \
2386 "Requires -Xloggc:<filename>") \
2387 \
2388 product(uintx, NumberOfGCLogFiles, 0, \
2389 "Number of gclog files in rotation, " \
2390 "Default: 0, no rotation") \
2391 \
2392 product(uintx, GCLogFileSize, 0, \
2393 "GC log file size, Default: 0 bytes, no rotation " \
2394 "Only valid with UseGCLogFileRotation") \
2395 \
2396 /* JVMTI heap profiling */ \
2397 \
2398 diagnostic(bool, TraceJVMTIObjectTagging, false, \
2399 "Trace JVMTI object tagging calls") \
2400 \
2401 diagnostic(bool, VerifyBeforeIteration, false, \
2402 "Verify memory system before JVMTI iteration") \
2403 \
2404 /* compiler interface */ \
2405 \
2406 develop(bool, CIPrintCompilerName, false, \
2407 "when CIPrint is active, print the name of the active compiler") \
2408 \
2409 develop(bool, CIPrintCompileQueue, false, \
2410 "display the contents of the compile queue whenever a " \
2411 "compilation is enqueued") \
2412 \
2413 develop(bool, CIPrintRequests, false, \
2414 "display every request for compilation") \
2415 \
2416 product(bool, CITime, false, \
2417 "collect timing information for compilation") \
2418 \
2419 develop(bool, CITimeEach, false, \
2420 "display timing information after each successful compilation") \
2421 \
2422 develop(bool, CICountOSR, false, \
2423 "use a separate counter when assigning ids to osr compilations") \
2424 \
2425 develop(bool, CICompileNatives, true, \
2426 "compile native methods if supported by the compiler") \
2427 \
2428 develop_pd(bool, CICompileOSR, \
2429 "compile on stack replacement methods if supported by the " \
2430 "compiler") \
2431 \
2432 develop(bool, CIPrintMethodCodes, false, \
2433 "print method bytecodes of the compiled code") \
2434 \
2435 develop(bool, CIPrintTypeFlow, false, \
2436 "print the results of ciTypeFlow analysis") \
2437 \
2438 develop(bool, CITraceTypeFlow, false, \
2439 "detailed per-bytecode tracing of ciTypeFlow analysis") \
2440 \
2441 develop(intx, OSROnlyBCI, -1, \
2442 "OSR only at this bci. Negative values mean exclude that bci") \
2443 \
2444 /* compiler */ \
2445 \
2446 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
2447 "Number of compiler threads to run") \
2448 \
2449 product(intx, CompilationPolicyChoice, 0, \
2450 "which compilation policy (0/1)") \
2451 \
2452 develop(bool, UseStackBanging, true, \
2453 "use stack banging for stack overflow checks (required for " \
2454 "proper StackOverflow handling; disable only to measure cost " \
2455 "of stackbanging)") \
2456 \
2457 develop(bool, UseStrictFP, true, \
2458 "use strict fp if modifier strictfp is set") \
2459 \
2460 develop(bool, GenerateSynchronizationCode, true, \
2461 "generate locking/unlocking code for synchronized methods and " \
2462 "monitors") \
2463 \
2464 develop(bool, GenerateCompilerNullChecks, true, \
2465 "Generate explicit null checks for loads/stores/calls") \
2466 \
2467 develop(bool, GenerateRangeChecks, true, \
2468 "Generate range checks for array accesses") \
2469 \
2470 develop_pd(bool, ImplicitNullChecks, \
2471 "generate code for implicit null checks") \
2472 \
2473 product(bool, PrintSafepointStatistics, false, \
2474 "print statistics about safepoint synchronization") \
2475 \
2476 product(intx, PrintSafepointStatisticsCount, 300, \
2477 "total number of safepoint statistics collected " \
2478 "before printing them out") \
2479 \
2480 product(intx, PrintSafepointStatisticsTimeout, -1, \
2481 "print safepoint statistics only when safepoint takes" \
2482 " more than PrintSafepointSatisticsTimeout in millis") \
2483 \
2484 product(bool, TraceSafepointCleanupTime, false, \
2485 "print the break down of clean up tasks performed during" \
2486 " safepoint") \
2487 \
2488 product(bool, Inline, true, \
2489 "enable inlining") \
2490 \
2491 product(bool, ClipInlining, true, \
2492 "clip inlining if aggregate method exceeds DesiredMethodLimit") \
2493 \
2494 develop(bool, UseCHA, true, \
2495 "enable CHA") \
2496 \
2497 product(bool, UseTypeProfile, true, \
2498 "Check interpreter profile for historically monomorphic calls") \
2499 \
2500 notproduct(bool, TimeCompiler, false, \
2501 "time the compiler") \
2502 \
2503 diagnostic(bool, PrintInlining, false, \
2504 "prints inlining optimizations") \
2505 \
2506 product(bool, UsePopCountInstruction, false, \
2507 "Use population count instruction") \
2508 \
2509 develop(bool, EagerInitialization, false, \
2510 "Eagerly initialize classes if possible") \
2511 \
2512 develop(bool, TraceMethodReplacement, false, \
2513 "Print when methods are replaced do to recompilation") \
2514 \
2515 develop(bool, PrintMethodFlushing, false, \
2516 "print the nmethods being flushed") \
2517 \
2518 develop(bool, UseRelocIndex, false, \
2519 "use an index to speed random access to relocations") \
2520 \
2521 develop(bool, StressCodeBuffers, false, \
2522 "Exercise code buffer expansion and other rare state changes") \
2523 \
2524 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
2525 "Generate extra debugging info for non-safepoints in nmethods") \
2526 \
2527 product(bool, PrintVMOptions, false, \
2528 "Print flags that appeared on the command line") \
2529 \
2530 product(bool, IgnoreUnrecognizedVMOptions, false, \
2531 "Ignore unrecognized VM options") \
2532 \
2533 product(bool, PrintCommandLineFlags, false, \
2534 "Print flags specified on command line or set by ergonomics") \
2535 \
2536 product(bool, PrintFlagsInitial, false, \
2537 "Print all VM flags before argument processing and exit VM") \
2538 \
2539 product(bool, PrintFlagsFinal, false, \
2540 "Print all VM flags after argument and ergonomic processing") \
2541 \
2542 notproduct(bool, PrintFlagsWithComments, false, \
2543 "Print all VM flags with default values and descriptions and exit")\
2544 \
2545 diagnostic(bool, SerializeVMOutput, true, \
2546 "Use a mutex to serialize output to tty and LogFile") \
2547 \
2548 diagnostic(bool, DisplayVMOutput, true, \
2549 "Display all VM output on the tty, independently of LogVMOutput") \
2550 \
2551 diagnostic(bool, LogVMOutput, false, \
2552 "Save VM output to LogFile") \
2553 \
2554 diagnostic(ccstr, LogFile, NULL, \
2555 "If LogVMOutput or LogCompilation is on, save VM output to " \
2556 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)") \
2557 \
2558 product(ccstr, ErrorFile, NULL, \
2559 "If an error occurs, save the error data to this file " \
2560 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
2561 \
2562 product(bool, DisplayVMOutputToStderr, false, \
2563 "If DisplayVMOutput is true, display all VM output to stderr") \
2564 \
2565 product(bool, DisplayVMOutputToStdout, false, \
2566 "If DisplayVMOutput is true, display all VM output to stdout") \
2567 \
2568 product(bool, UseHeavyMonitors, false, \
2569 "use heavyweight instead of lightweight Java monitors") \
2570 \
2571 product(bool, PrintStringTableStatistics, false, \
2572 "print statistics about the StringTable and SymbolTable") \
2573 \
2574 diagnostic(bool, VerifyStringTableAtExit, false, \
2575 "verify StringTable contents at exit") \
2576 \
2577 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
2578 "print histogram of the symbol table") \
2579 \
2580 notproduct(bool, ExitVMOnVerifyError, false, \
2581 "standard exit from VM if bytecode verify error " \
2582 "(only in debug mode)") \
2583 \
2584 notproduct(ccstr, AbortVMOnException, NULL, \
2585 "Call fatal if this exception is thrown. Example: " \
2586 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2587 \
2588 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
2589 "Call fatal if the exception pointed by AbortVMOnException " \
2590 "has this message.") \
2591 \
2592 develop(bool, DebugVtables, false, \
2593 "add debugging code to vtable dispatch") \
2594 \
2595 develop(bool, PrintVtables, false, \
2596 "print vtables when printing klass") \
2597 \
2598 notproduct(bool, PrintVtableStats, false, \
2599 "print vtables stats at end of run") \
2600 \
2601 develop(bool, TraceCreateZombies, false, \
2602 "trace creation of zombie nmethods") \
2603 \
2604 notproduct(bool, IgnoreLockingAssertions, false, \
2605 "disable locking assertions (for speed)") \
2606 \
2607 product(bool, RangeCheckElimination, true, \
2608 "Eliminate range checks") \
2609 \
2610 develop_pd(bool, UncommonNullCast, \
2611 "track occurrences of null in casts; adjust compiler tactics") \
2612 \
2613 develop(bool, TypeProfileCasts, true, \
2614 "treat casts like calls for purposes of type profiling") \
2615 \
2616 develop(bool, DelayCompilationDuringStartup, true, \
2617 "Delay invoking the compiler until main application class is " \
2618 "loaded") \
2619 \
2620 develop(bool, CompileTheWorld, false, \
2621 "Compile all methods in all classes in bootstrap class path " \
2622 "(stress test)") \
2623 \
2624 develop(bool, CompileTheWorldPreloadClasses, true, \
2625 "Preload all classes used by a class before start loading") \
2626 \
2627 notproduct(intx, CompileTheWorldSafepointInterval, 100, \
2628 "Force a safepoint every n compiles so sweeper can keep up") \
2629 \
2630 develop(bool, FillDelaySlots, true, \
2631 "Fill delay slots (on SPARC only)") \
2632 \
2633 develop(bool, TimeLivenessAnalysis, false, \
2634 "Time computation of bytecode liveness analysis") \
2635 \
2636 develop(bool, TraceLivenessGen, false, \
2637 "Trace the generation of liveness analysis information") \
2638 \
2639 notproduct(bool, TraceLivenessQuery, false, \
2640 "Trace queries of liveness analysis information") \
2641 \
2642 notproduct(bool, CollectIndexSetStatistics, false, \
2643 "Collect information about IndexSets") \
2644 \
2645 develop(bool, UseLoopSafepoints, true, \
2646 "Generate Safepoint nodes in every loop") \
2647 \
2648 develop(intx, FastAllocateSizeLimit, 128*K, \
2649 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
2650 "Inline allocations larger than this in doublewords must go slow")\
2651 \
2652 product(bool, AggressiveOpts, false, \
2653 "Enable aggressive optimizations - see arguments.cpp") \
2654 \
2655 /* statistics */ \
2656 develop(bool, CountCompiledCalls, false, \
2657 "counts method invocations") \
2658 \
2659 notproduct(bool, CountRuntimeCalls, false, \
2660 "counts VM runtime calls") \
2661 \
2662 develop(bool, CountJNICalls, false, \
2663 "counts jni method invocations") \
2664 \
2665 notproduct(bool, CountJVMCalls, false, \
2666 "counts jvm method invocations") \
2667 \
2668 notproduct(bool, CountRemovableExceptions, false, \
2669 "count exceptions that could be replaced by branches due to " \
2670 "inlining") \
2671 \
2672 notproduct(bool, ICMissHistogram, false, \
2673 "produce histogram of IC misses") \
2674 \
2675 notproduct(bool, PrintClassStatistics, false, \
2676 "prints class statistics at end of run") \
2677 \
2678 notproduct(bool, PrintMethodStatistics, false, \
2679 "prints method statistics at end of run") \
2680 \
2681 /* interpreter */ \
2682 develop(bool, ClearInterpreterLocals, false, \
2683 "Always clear local variables of interpreter activations upon " \
2684 "entry") \
2685 \
2686 product_pd(bool, RewriteBytecodes, \
2687 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
2688 \
2689 product_pd(bool, RewriteFrequentPairs, \
2690 "Rewrite frequently used bytecode pairs into a single bytecode") \
2691 \
2692 diagnostic(bool, PrintInterpreter, false, \
2693 "Prints the generated interpreter code") \
2694 \
2695 product(bool, UseInterpreter, true, \
2696 "Use interpreter for non-compiled methods") \
2697 \
2698 develop(bool, UseFastSignatureHandlers, true, \
2699 "Use fast signature handlers for native calls") \
2700 \
2701 product(bool, UseLoopCounter, true, \
2702 "Increment invocation counter on backward branch") \
2703 \
2704 product(bool, UseFastEmptyMethods, true, \
2705 "Use fast method entry code for empty methods") \
2706 \
2707 product(bool, UseFastAccessorMethods, true, \
2708 "Use fast method entry code for accessor methods") \
2709 \
2710 product_pd(bool, UseOnStackReplacement, \
2711 "Use on stack replacement, calls runtime if invoc. counter " \
2712 "overflows in loop") \
2713 \
2714 notproduct(bool, TraceOnStackReplacement, false, \
2715 "Trace on stack replacement") \
2716 \
2717 product_pd(bool, PreferInterpreterNativeStubs, \
2718 "Use always interpreter stubs for native methods invoked via " \
2719 "interpreter") \
2720 \
2721 develop(bool, CountBytecodes, false, \
2722 "Count number of bytecodes executed") \
2723 \
2724 develop(bool, PrintBytecodeHistogram, false, \
2725 "Print histogram of the executed bytecodes") \
2726 \
2727 develop(bool, PrintBytecodePairHistogram, false, \
2728 "Print histogram of the executed bytecode pairs") \
2729 \
2730 diagnostic(bool, PrintSignatureHandlers, false, \
2731 "Print code generated for native method signature handlers") \
2732 \
2733 develop(bool, VerifyOops, false, \
2734 "Do plausibility checks for oops") \
2735 \
2736 develop(bool, CheckUnhandledOops, false, \
2737 "Check for unhandled oops in VM code") \
2738 \
2739 develop(bool, VerifyJNIFields, trueInDebug, \
2740 "Verify jfieldIDs for instance fields") \
2741 \
2742 notproduct(bool, VerifyJNIEnvThread, false, \
2743 "Verify JNIEnv.thread == Thread::current() when entering VM " \
2744 "from JNI") \
2745 \
2746 develop(bool, VerifyFPU, false, \
2747 "Verify FPU state (check for NaN's, etc.)") \
2748 \
2749 develop(bool, VerifyThread, false, \
2750 "Watch the thread register for corruption (SPARC only)") \
2751 \
2752 develop(bool, VerifyActivationFrameSize, false, \
2753 "Verify that activation frame didn't become smaller than its " \
2754 "minimal size") \
2755 \
2756 develop(bool, TraceFrequencyInlining, false, \
2757 "Trace frequency based inlining") \
2758 \
2759 develop_pd(bool, InlineIntrinsics, \
2760 "Inline intrinsics that can be statically resolved") \
2761 \
2762 product_pd(bool, ProfileInterpreter, \
2763 "Profile at the bytecode level during interpretation") \
2764 \
2765 develop_pd(bool, ProfileTraps, \
2766 "Profile deoptimization traps at the bytecode level") \
2767 \
2768 product(intx, ProfileMaturityPercentage, 20, \
2769 "number of method invocations/branches (expressed as % of " \
2770 "CompileThreshold) before using the method's profile") \
2771 \
2772 develop(bool, PrintMethodData, false, \
2773 "Print the results of +ProfileInterpreter at end of run") \
2774 \
2775 develop(bool, VerifyDataPointer, trueInDebug, \
2776 "Verify the method data pointer during interpreter profiling") \
2777 \
2778 develop(bool, VerifyCompiledCode, false, \
2779 "Include miscellaneous runtime verifications in nmethod code; " \
2780 "default off because it disturbs nmethod size heuristics") \
2781 \
2782 notproduct(bool, CrashGCForDumpingJavaThread, false, \
2783 "Manually make GC thread crash then dump java stack trace; " \
2784 "Test only") \
2785 \
2786 /* compilation */ \
2787 product(bool, UseCompiler, true, \
2788 "use compilation") \
2789 \
2790 develop(bool, TraceCompilationPolicy, false, \
2791 "Trace compilation policy") \
2792 \
2793 develop(bool, TimeCompilationPolicy, false, \
2794 "Time the compilation policy") \
2795 \
2796 product(bool, UseCounterDecay, true, \
2797 "adjust recompilation counters") \
2798 \
2799 develop(intx, CounterHalfLifeTime, 30, \
2800 "half-life time of invocation counters (in secs)") \
2801 \
2802 develop(intx, CounterDecayMinIntervalLength, 500, \
2803 "Min. ms. between invocation of CounterDecay") \
2804 \
2805 product(bool, AlwaysCompileLoopMethods, false, \
2806 "when using recompilation, never interpret methods " \
2807 "containing loops") \
2808 \
2809 product(bool, DontCompileHugeMethods, true, \
2810 "don't compile methods > HugeMethodLimit") \
2811 \
2812 /* Bytecode escape analysis estimation. */ \
2813 product(bool, EstimateArgEscape, true, \
2814 "Analyze bytecodes to estimate escape state of arguments") \
2815 \
2816 product(intx, BCEATraceLevel, 0, \
2817 "How much tracing to do of bytecode escape analysis estimates") \
2818 \
2819 product(intx, MaxBCEAEstimateLevel, 5, \
2820 "Maximum number of nested calls that are analyzed by BC EA.") \
2821 \
2822 product(intx, MaxBCEAEstimateSize, 150, \
2823 "Maximum bytecode size of a method to be analyzed by BC EA.") \
2824 \
2825 product(intx, AllocatePrefetchStyle, 1, \
2826 "0 = no prefetch, " \
2827 "1 = prefetch instructions for each allocation, " \
2828 "2 = use TLAB watermark to gate allocation prefetch, " \
2829 "3 = use BIS instruction on Sparc for allocation prefetch") \
2830 \
2831 product(intx, AllocatePrefetchDistance, -1, \
2832 "Distance to prefetch ahead of allocation pointer") \
2833 \
2834 product(intx, AllocatePrefetchLines, 3, \
2835 "Number of lines to prefetch ahead of array allocation pointer") \
2836 \
2837 product(intx, AllocateInstancePrefetchLines, 1, \
2838 "Number of lines to prefetch ahead of instance allocation pointer") \
2839 \
2840 product(intx, AllocatePrefetchStepSize, 16, \
2841 "Step size in bytes of sequential prefetch instructions") \
2842 \
2843 product(intx, AllocatePrefetchInstr, 0, \
2844 "Prefetch instruction to prefetch ahead of allocation pointer") \
2845 \
2846 /* deoptimization */ \
2847 develop(bool, TraceDeoptimization, false, \
2848 "Trace deoptimization") \
2849 \
2850 develop(bool, DebugDeoptimization, false, \
2851 "Tracing various information while debugging deoptimization") \
2852 \
2853 product(intx, SelfDestructTimer, 0, \
2854 "Will cause VM to terminate after a given time (in minutes) " \
2855 "(0 means off)") \
2856 \
2857 product(intx, MaxJavaStackTraceDepth, 1024, \
2858 "Max. no. of lines in the stack trace for Java exceptions " \
2859 "(0 means all)") \
2860 \
2861 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
2862 "Guarantee a safepoint (at least) every so many milliseconds " \
2863 "(0 means none)")) \
2864 \
2865 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
2866 "Guarantee a safepoint (at least) every so many milliseconds " \
2867 "(0 means none)")) \
2868 \
2869 product(intx, SafepointTimeoutDelay, 10000, \
2870 "Delay in milliseconds for option SafepointTimeout") \
2871 \
2872 product(intx, NmethodSweepFraction, 16, \
2873 "Number of invocations of sweeper to cover all nmethods") \
2874 \
2875 product(intx, NmethodSweepCheckInterval, 5, \
2876 "Compilers wake up every n seconds to possibly sweep nmethods") \
2877 \
2878 product(intx, NmethodSweepActivity, 10, \
2879 "Removes cold nmethods from code cache if > 0. Higher values " \
2880 "result in more aggressive sweeping") \
2881 \
2882 notproduct(bool, LogSweeper, false, \
2883 "Keep a ring buffer of sweeper activity") \
2884 \
2885 notproduct(intx, SweeperLogEntries, 1024, \
2886 "Number of records in the ring buffer of sweeper activity") \
2887 \
2888 notproduct(intx, MemProfilingInterval, 500, \
2889 "Time between each invocation of the MemProfiler") \
2890 \
2891 develop(intx, MallocCatchPtr, -1, \
2892 "Hit breakpoint when mallocing/freeing this pointer") \
2893 \
2894 notproduct(intx, AssertRepeat, 1, \
2895 "number of times to evaluate expression in assert " \
2896 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2897 \
2898 notproduct(ccstrlist, SuppressErrorAt, "", \
2899 "List of assertions (file:line) to muzzle") \
2900 \
2901 notproduct(uintx, HandleAllocationLimit, 1024, \
2902 "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2903 "is used") \
2904 \
2905 develop(uintx, TotalHandleAllocationLimit, 1024, \
2906 "Threshold for total handle allocation when " \
2907 "+TraceHandleAllocation is used") \
2908 \
2909 develop(intx, StackPrintLimit, 100, \
2910 "number of stack frames to print in VM-level stack dump") \
2911 \
2912 notproduct(intx, MaxElementPrintSize, 256, \
2913 "maximum number of elements to print") \
2914 \
2915 notproduct(intx, MaxSubklassPrintSize, 4, \
2916 "maximum number of subklasses to print when printing klass") \
2917 \
2918 product(intx, MaxInlineLevel, 9, \
2919 "maximum number of nested calls that are inlined") \
2920 \
2921 product(intx, MaxRecursiveInlineLevel, 1, \
2922 "maximum number of nested recursive calls that are inlined") \
2923 \
2924 product_pd(intx, InlineSmallCode, \
2925 "Only inline already compiled methods if their code size is " \
2926 "less than this") \
2927 \
2928 product(intx, MaxInlineSize, 35, \
2929 "maximum bytecode size of a method to be inlined") \
2930 \
2931 product_pd(intx, FreqInlineSize, \
2932 "maximum bytecode size of a frequent method to be inlined") \
2933 \
2934 product(intx, MaxTrivialSize, 6, \
2935 "maximum bytecode size of a trivial method to be inlined") \
2936 \
2937 product(intx, MinInliningThreshold, 250, \
2938 "min. invocation count a method needs to have to be inlined") \
2939 \
2940 develop(intx, MethodHistogramCutoff, 100, \
2941 "cutoff value for method invoc. histogram (+CountCalls)") \
2942 \
2943 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
2944 "# of interpreted methods to show in profile") \
2945 \
2946 develop(intx, ProfilerNumberOfCompiledMethods, 25, \
2947 "# of compiled methods to show in profile") \
2948 \
2949 develop(intx, ProfilerNumberOfStubMethods, 25, \
2950 "# of stub methods to show in profile") \
2951 \
2952 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
2953 "# of runtime stub nodes to show in profile") \
2954 \
2955 product(intx, ProfileIntervalsTicks, 100, \
2956 "# of ticks between printing of interval profile " \
2957 "(+ProfileIntervals)") \
2958 \
2959 notproduct(intx, ScavengeALotInterval, 1, \
2960 "Interval between which scavenge will occur with +ScavengeALot") \
2961 \
2962 notproduct(intx, FullGCALotInterval, 1, \
2963 "Interval between which full gc will occur with +FullGCALot") \
2964 \
2965 notproduct(intx, FullGCALotStart, 0, \
2966 "For which invocation to start FullGCAlot") \
2967 \
2968 notproduct(intx, FullGCALotDummies, 32*K, \
2969 "Dummy object allocated with +FullGCALot, forcing all objects " \
2970 "to move") \
2971 \
2972 develop(intx, DontYieldALotInterval, 10, \
2973 "Interval between which yields will be dropped (milliseconds)") \
2974 \
2975 develop(intx, MinSleepInterval, 1, \
2976 "Minimum sleep() interval (milliseconds) when " \
2977 "ConvertSleepToYield is off (used for SOLARIS)") \
2978 \
2979 develop(intx, ProfilerPCTickThreshold, 15, \
2980 "Number of ticks in a PC buckets to be a hotspot") \
2981 \
2982 notproduct(intx, DeoptimizeALotInterval, 5, \
2983 "Number of exits until DeoptimizeALot kicks in") \
2984 \
2985 notproduct(intx, ZombieALotInterval, 5, \
2986 "Number of exits until ZombieALot kicks in") \
2987 \
2988 develop(bool, StressNonEntrant, false, \
2989 "Mark nmethods non-entrant at registration") \
2990 \
2991 diagnostic(intx, MallocVerifyInterval, 0, \
2992 "if non-zero, verify C heap after every N calls to " \
2993 "malloc/realloc/free") \
2994 \
2995 diagnostic(intx, MallocVerifyStart, 0, \
2996 "if non-zero, start verifying C heap after Nth call to " \
2997 "malloc/realloc/free") \
2998 \
2999 diagnostic(uintx, MallocMaxTestWords, 0, \
3000 "if non-zero, max # of Words that malloc/realloc can allocate " \
3001 "(for testing only)") \
3002 \
3003 product(intx, TypeProfileWidth, 2, \
3004 "number of receiver types to record in call/cast profile") \
3005 \
3006 develop(intx, BciProfileWidth, 2, \
3007 "number of return bci's to record in ret profile") \
3008 \
3009 product(intx, PerMethodRecompilationCutoff, 400, \
3010 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3011 \
3012 product(intx, PerBytecodeRecompilationCutoff, 200, \
3013 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
3014 \
3015 product(intx, PerMethodTrapLimit, 100, \
3016 "Limit on traps (of one kind) in a method (includes inlines)") \
3017 \
3018 product(intx, PerBytecodeTrapLimit, 4, \
3019 "Limit on traps (of one kind) at a particular BCI") \
3020 \
3021 develop(intx, InlineFrequencyRatio, 20, \
3022 "Ratio of call site execution to caller method invocation") \
3023 \
3024 develop_pd(intx, InlineFrequencyCount, \
3025 "Count of call site execution necessary to trigger frequent " \
3026 "inlining") \
3027 \
3028 develop(intx, InlineThrowCount, 50, \
3029 "Force inlining of interpreted methods that throw this often") \
3030 \
3031 develop(intx, InlineThrowMaxSize, 200, \
3032 "Force inlining of throwing methods smaller than this") \
3033 \
3034 develop(intx, ProfilerNodeSize, 1024, \
3035 "Size in K to allocate for the Profile Nodes of each thread") \
3036 \
3037 product_pd(intx, PreInflateSpin, \
3038 "Number of times to spin wait before inflation") \
3039 \
3040 /* gc parameters */ \
3041 product(uintx, InitialHeapSize, 0, \
3042 "Initial heap size (in bytes); zero means use ergonomics") \
3043 \
3044 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
3045 "Maximum heap size (in bytes)") \
3046 \
3047 product(uintx, OldSize, ScaleForWordSize(4*M), \
3048 "Initial tenured generation size (in bytes)") \
3049 \
3050 product(uintx, NewSize, ScaleForWordSize(1*M), \
3051 "Initial new generation size (in bytes)") \
3052 \
3053 product(uintx, MaxNewSize, max_uintx, \
3054 "Maximum new generation size (in bytes), max_uintx means set " \
3055 "ergonomically") \
3056 \
3057 product(uintx, PretenureSizeThreshold, 0, \
3058 "Maximum size in bytes of objects allocated in DefNew " \
3059 "generation; zero means no maximum") \
3060 \
3061 product(uintx, TLABSize, 0, \
3062 "Starting TLAB size (in bytes); zero means set ergonomically") \
3063 \
3064 product(uintx, MinTLABSize, 2*K, \
3065 "Minimum allowed TLAB size (in bytes)") \
3066 \
3067 product(uintx, TLABAllocationWeight, 35, \
3068 "Allocation averaging weight") \
3069 \
3070 product(uintx, TLABWasteTargetPercent, 1, \
3071 "Percentage of Eden that can be wasted") \
3072 \
3073 product(uintx, TLABRefillWasteFraction, 64, \
3074 "Max TLAB waste at a refill (internal fragmentation)") \
3075 \
3076 product(uintx, TLABWasteIncrement, 4, \
3077 "Increment allowed waste at slow allocation") \
3078 \
3079 product(uintx, SurvivorRatio, 8, \
3080 "Ratio of eden/survivor space size") \
3081 \
3082 product(uintx, NewRatio, 2, \
3083 "Ratio of new/old generation sizes") \
3084 \
3085 product_pd(uintx, NewSizeThreadIncrease, \
3086 "Additional size added to desired new generation size per " \
3087 "non-daemon thread (in bytes)") \
3088 \
3089 product_pd(uintx, MetaspaceSize, \
3090 "Initial size of Metaspaces (in bytes)") \
3091 \
3092 product(uintx, MaxMetaspaceSize, max_uintx, \
3093 "Maximum size of Metaspaces (in bytes)") \
3094 \
3095 product(uintx, CompressedClassSpaceSize, 1*G, \
3096 "Maximum size of class area in Metaspace when compressed " \
3097 "class pointers are used") \
3098 \
3099 product(uintx, MinHeapFreeRatio, 40, \
3100 "Min percentage of heap free after GC to avoid expansion") \
3101 \
3102 product(uintx, MaxHeapFreeRatio, 70, \
3103 "Max percentage of heap free after GC to avoid shrinking") \
3104 \
3105 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
3106 "Number of milliseconds per MB of free space in the heap") \
3107 \
3108 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
3109 "Min change in heap space due to GC (in bytes)") \
3110 \
3111 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
3112 "Min expansion of Metaspace (in bytes)") \
3113 \
3114 product(uintx, MinMetaspaceFreeRatio, 40, \
3115 "Min percentage of Metaspace free after GC to avoid expansion") \
3116 \
3117 product(uintx, MaxMetaspaceFreeRatio, 70, \
3118 "Max percentage of Metaspace free after GC to avoid shrinking") \
3119 \
3120 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
3121 "Max expansion of Metaspace without full GC (in bytes)") \
3122 \
3123 product(uintx, QueuedAllocationWarningCount, 0, \
3124 "Number of times an allocation that queues behind a GC " \
3125 "will retry before printing a warning") \
3126 \
3127 diagnostic(uintx, VerifyGCStartAt, 0, \
3128 "GC invoke count where +VerifyBefore/AfterGC kicks in") \
3129 \
3130 diagnostic(intx, VerifyGCLevel, 0, \
3131 "Generation level at which to start +VerifyBefore/AfterGC") \
3132 \
3133 product(uintx, MaxTenuringThreshold, 15, \
3134 "Maximum value for tenuring threshold") \
3135 \
3136 product(uintx, InitialTenuringThreshold, 7, \
3137 "Initial value for tenuring threshold") \
3138 \
3139 product(uintx, TargetSurvivorRatio, 50, \
3140 "Desired percentage of survivor space used after scavenge") \
3141 \
3142 product(uintx, MarkSweepDeadRatio, 5, \
3143 "Percentage (0-100) of the old gen allowed as dead wood." \
3144 "Serial mark sweep treats this as both the min and max value." \
3145 "CMS uses this value only if it falls back to mark sweep." \
3146 "Par compact uses a variable scale based on the density of the" \
3147 "generation and treats this as the max value when the heap is" \
3148 "either completely full or completely empty. Par compact also" \
3149 "has a smaller default value; see arguments.cpp.") \
3150 \
3151 product(uintx, MarkSweepAlwaysCompactCount, 4, \
3152 "How often should we fully compact the heap (ignoring the dead " \
3153 "space parameters)") \
3154 \
3155 product(intx, PrintCMSStatistics, 0, \
3156 "Statistics for CMS") \
3157 \
3158 product(bool, PrintCMSInitiationStatistics, false, \
3159 "Statistics for initiating a CMS collection") \
3160 \
3161 product(intx, PrintFLSStatistics, 0, \
3162 "Statistics for CMS' FreeListSpace") \
3163 \
3164 product(intx, PrintFLSCensus, 0, \
3165 "Census for CMS' FreeListSpace") \
3166 \
3167 develop(uintx, GCExpandToAllocateDelayMillis, 0, \
3168 "Delay in ms between expansion and allocation") \
3169 \
3170 develop(uintx, GCWorkerDelayMillis, 0, \
3171 "Delay in ms in scheduling GC workers") \
3172 \
3173 product(intx, DeferThrSuspendLoopCount, 4000, \
3174 "(Unstable) Number of times to iterate in safepoint loop " \
3175 " before blocking VM threads ") \
3176 \
3177 product(intx, DeferPollingPageLoopCount, -1, \
3178 "(Unsafe,Unstable) Number of iterations in safepoint loop " \
3179 "before changing safepoint polling page to RO ") \
3180 \
3181 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
3182 \
3183 product(bool, PSChunkLargeArrays, true, \
3184 "true: process large arrays in chunks") \
3185 \
3186 product(uintx, GCDrainStackTargetSize, 64, \
3187 "how many entries we'll try to leave on the stack during " \
3188 "parallel GC") \
3189 \
3190 /* stack parameters */ \
3191 product_pd(intx, StackYellowPages, \
3192 "Number of yellow zone (recoverable overflows) pages") \
3193 \
3194 product_pd(intx, StackRedPages, \
3195 "Number of red zone (unrecoverable overflows) pages") \
3196 \
3197 product_pd(intx, StackShadowPages, \
3198 "Number of shadow zone (for overflow checking) pages" \
3199 " this should exceed the depth of the VM and native call stack") \
3200 \
3201 product_pd(intx, ThreadStackSize, \
3202 "Thread Stack Size (in Kbytes)") \
3203 \
3204 product_pd(intx, VMThreadStackSize, \
3205 "Non-Java Thread Stack Size (in Kbytes)") \
3206 \
3207 product_pd(intx, CompilerThreadStackSize, \
3208 "Compiler Thread Stack Size (in Kbytes)") \
3209 \
3210 develop_pd(uintx, JVMInvokeMethodSlack, \
3211 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
3212 \
3213 product(uintx, ThreadSafetyMargin, 50*M, \
3214 "Thread safety margin is used on fixed-stack LinuxThreads (on " \
3215 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
3216 "disable this feature") \
3217 \
3218 /* code cache parameters */ \
3219 develop(uintx, CodeCacheSegmentSize, 64, \
3220 "Code cache segment size (in bytes) - smallest unit of " \
3221 "allocation") \
3222 \
3223 develop_pd(intx, CodeEntryAlignment, \
3224 "Code entry alignment for generated code (in bytes)") \
3225 \
3226 product_pd(intx, OptoLoopAlignment, \
3227 "Align inner loops to zero relative to this modulus") \
3228 \
3229 product_pd(uintx, InitialCodeCacheSize, \
3230 "Initial code cache size (in bytes)") \
3231 \
3232 develop_pd(uintx, CodeCacheMinimumUseSpace, \
3233 "Minimum code cache size (in bytes) required to start VM.") \
3234 \
3235 product_pd(uintx, ReservedCodeCacheSize, \
3236 "Reserved code cache size (in bytes) - maximum code cache size") \
3237 \
3238 product_pd(uintx, NonProfiledCodeHeapSize, \
3239 "Size of code heap with non-profiled methods (in bytes)") \
3240 \
3241 product_pd(uintx, ProfiledCodeHeapSize, \
3242 "Size of code heap with profiled methods (in bytes)") \
3243 \
3244 product_pd(uintx, NonMethodCodeHeapSize, \
3245 "Size of code heap with non-methods (in bytes)") \
3246 \
3247 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
3248 "When less than X space left, we stop compiling.") \
3249 \
3250 product_pd(uintx, CodeCacheExpansionSize, \
3251 "Code cache expansion size (in bytes)") \
3252 \
3253 develop_pd(uintx, CodeCacheMinBlockLength, \
3254 "Minimum number of segments in a code cache block.") \
3255 \
3256 notproduct(bool, ExitOnFullCodeCache, false, \
3257 "Exit the VM if we fill the code cache.") \
3258 \
3259 product(bool, UseCodeCacheFlushing, true, \
3260 "Attempt to clean the code cache before shutting off compiler") \
3261 \
3262 /* interpreter debugging */ \
3263 develop(intx, BinarySwitchThreshold, 5, \
3264 "Minimal number of lookupswitch entries for rewriting to binary " \
3265 "switch") \
3266 \
3267 develop(intx, StopInterpreterAt, 0, \
3268 "Stops interpreter execution at specified bytecode number") \
3269 \
3270 develop(intx, TraceBytecodesAt, 0, \
3271 "Traces bytecodes starting with specified bytecode number") \
3272 \
3273 /* compiler interface */ \
3274 develop(intx, CIStart, 0, \
3275 "the id of the first compilation to permit") \
3276 \
3277 develop(intx, CIStop, -1, \
3278 "the id of the last compilation to permit") \
3279 \
3280 develop(intx, CIStartOSR, 0, \
3281 "the id of the first osr compilation to permit " \
3282 "(CICountOSR must be on)") \
3283 \
3284 develop(intx, CIStopOSR, -1, \
3285 "the id of the last osr compilation to permit " \
3286 "(CICountOSR must be on)") \
3287 \
3288 develop(intx, CIBreakAtOSR, -1, \
3289 "id of osr compilation to break at") \
3290 \
3291 develop(intx, CIBreakAt, -1, \
3292 "id of compilation to break at") \
3293 \
3294 product(ccstrlist, CompileOnly, "", \
3295 "List of methods (pkg/class.name) to restrict compilation to") \
3296 \
3297 product(ccstr, CompileCommandFile, NULL, \
3298 "Read compiler commands from this file [.hotspot_compiler]") \
3299 \
3300 product(ccstrlist, CompileCommand, "", \
3301 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3302 \
3303 develop(bool, ReplayCompiles, false, \
3304 "Enable replay of compilations from ReplayDataFile") \
3305 \
3306 product(ccstr, ReplayDataFile, NULL, \
3307 "File containing compilation replay information" \
3308 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
3309 \
3310 develop(intx, ReplaySuppressInitializers, 2, \
3311 "Controls handling of class initialization during replay" \
3312 "0 - don't do anything special" \
3313 "1 - treat all class initializers as empty" \
3314 "2 - treat class initializers for application classes as empty" \
3315 "3 - allow all class initializers to run during bootstrap but" \
3316 " pretend they are empty after starting replay") \
3317 \
3318 develop(bool, ReplayIgnoreInitErrors, false, \
3319 "Ignore exceptions thrown during initialization for replay") \
3320 \
3321 product(bool, DumpReplayDataOnError, true, \
3322 "Record replay data for crashing compiler threads") \
3323 \
3324 product(bool, CICompilerCountPerCPU, false, \
3325 "1 compiler thread for log(N CPUs)") \
3326 \
3327 develop(intx, CIFireOOMAt, -1, \
3328 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \
3329 "(non-negative value throws OOM after this many CI accesses " \
3330 "in each compile)") \
3331 notproduct(intx, CICrashAt, -1, \
3332 "id of compilation to trigger assert in compiler thread for " \
3333 "the purpose of testing, e.g. generation of replay data") \
3334 notproduct(bool, CIObjectFactoryVerify, false, \
3335 "enable potentially expensive verification in ciObjectFactory") \
3336 \
3337 /* Priorities */ \
3338 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
3339 \
3340 product(intx, ThreadPriorityPolicy, 0, \
3341 "0 : Normal. "\
3342 " VM chooses priorities that are appropriate for normal "\
3343 " applications. On Solaris NORM_PRIORITY and above are mapped "\
3344 " to normal native priority. Java priorities below NORM_PRIORITY"\
3345 " map to lower native priority values. On Windows applications"\
3346 " are allowed to use higher native priorities. However, with "\
3347 " ThreadPriorityPolicy=0, VM will not use the highest possible"\
3348 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\
3349 " interfere with system threads. On Linux thread priorities "\
3350 " are ignored because the OS does not support static priority "\
3351 " in SCHED_OTHER scheduling class which is the only choice for"\
3352 " non-root, non-realtime applications. "\
3353 "1 : Aggressive. "\
3354 " Java thread priorities map over to the entire range of "\
3355 " native thread priorities. Higher Java thread priorities map "\
3356 " to higher native thread priorities. This policy should be "\
3357 " used with care, as sometimes it can cause performance "\
3358 " degradation in the application and/or the entire system. On "\
3359 " Linux this policy requires root privilege.") \
3360 \
3361 product(bool, ThreadPriorityVerbose, false, \
3362 "Print priority changes") \
3363 \
3364 product(intx, DefaultThreadPriority, -1, \
3365 "The native priority at which threads run if not elsewhere " \
3366 "specified (-1 means no change)") \
3367 \
3368 product(intx, CompilerThreadPriority, -1, \
3369 "The native priority at which compiler threads should run " \
3370 "(-1 means no change)") \
3371 \
3372 product(intx, VMThreadPriority, -1, \
3373 "The native priority at which the VM thread should run " \
3374 "(-1 means no change)") \
3375 \
3376 product(bool, CompilerThreadHintNoPreempt, true, \
3377 "(Solaris only) Give compiler threads an extra quanta") \
3378 \
3379 product(bool, VMThreadHintNoPreempt, false, \
3380 "(Solaris only) Give VM thread an extra quanta") \
3381 \
3382 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3383 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3384 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3385 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3386 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3387 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3388 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3389 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3390 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3391 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3392 \
3393 experimental(bool, UseCriticalJavaThreadPriority, false, \
3394 "Java thread priority 10 maps to critical scheduling priority") \
3395 \
3396 experimental(bool, UseCriticalCompilerThreadPriority, false, \
3397 "Compiler thread(s) run at critical scheduling priority") \
3398 \
3399 experimental(bool, UseCriticalCMSThreadPriority, false, \
3400 "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3401 \
3402 /* compiler debugging */ \
3403 notproduct(intx, CompileTheWorldStartAt, 1, \
3404 "First class to consider when using +CompileTheWorld") \
3405 \
3406 notproduct(intx, CompileTheWorldStopAt, max_jint, \
3407 "Last class to consider when using +CompileTheWorld") \
3408 \
3409 develop(intx, NewCodeParameter, 0, \
3410 "Testing Only: Create a dedicated integer parameter before " \
3411 "putback") \
3412 \
3413 /* new oopmap storage allocation */ \
3414 develop(intx, MinOopMapAllocation, 8, \
3415 "Minimum number of OopMap entries in an OopMapSet") \
3416 \
3417 /* Background Compilation */ \
3418 develop(intx, LongCompileThreshold, 50, \
3419 "Used with +TraceLongCompiles") \
3420 \
3421 product(intx, StarvationMonitorInterval, 200, \
3422 "Pause between each check in ms") \
3423 \
3424 /* recompilation */ \
3425 product_pd(intx, CompileThreshold, \
3426 "number of interpreted method invocations before (re-)compiling") \
3427 \
3428 product_pd(intx, BackEdgeThreshold, \
3429 "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3430 \
3431 product(intx, Tier0InvokeNotifyFreqLog, 7, \
3432 "Interpreter (tier 0) invocation notification frequency.") \
3433 \
3434 product(intx, Tier2InvokeNotifyFreqLog, 11, \
3435 "C1 without MDO (tier 2) invocation notification frequency.") \
3436 \
3437 product(intx, Tier3InvokeNotifyFreqLog, 10, \
3438 "C1 with MDO profiling (tier 3) invocation notification " \
3439 "frequency.") \
3440 \
3441 product(intx, Tier23InlineeNotifyFreqLog, 20, \
3442 "Inlinee invocation (tiers 2 and 3) notification frequency") \
3443 \
3444 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
3445 "Interpreter (tier 0) invocation notification frequency.") \
3446 \
3447 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
3448 "C1 without MDO (tier 2) invocation notification frequency.") \
3449 \
3450 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
3451 "C1 with MDO profiling (tier 3) invocation notification " \
3452 "frequency.") \
3453 \
3454 product(intx, Tier2CompileThreshold, 0, \
3455 "threshold at which tier 2 compilation is invoked") \
3456 \
3457 product(intx, Tier2BackEdgeThreshold, 0, \
3458 "Back edge threshold at which tier 2 compilation is invoked") \
3459 \
3460 product(intx, Tier3InvocationThreshold, 200, \
3461 "Compile if number of method invocations crosses this " \
3462 "threshold") \
3463 \
3464 product(intx, Tier3MinInvocationThreshold, 100, \
3465 "Minimum invocation to compile at tier 3") \
3466 \
3467 product(intx, Tier3CompileThreshold, 2000, \
3468 "Threshold at which tier 3 compilation is invoked (invocation " \
3469 "minimum must be satisfied.") \
3470 \
3471 product(intx, Tier3BackEdgeThreshold, 60000, \
3472 "Back edge threshold at which tier 3 OSR compilation is invoked") \
3473 \
3474 product(intx, Tier4InvocationThreshold, 5000, \
3475 "Compile if number of method invocations crosses this " \
3476 "threshold") \
3477 \
3478 product(intx, Tier4MinInvocationThreshold, 600, \
3479 "Minimum invocation to compile at tier 4") \
3480 \
3481 product(intx, Tier4CompileThreshold, 15000, \
3482 "Threshold at which tier 4 compilation is invoked (invocation " \
3483 "minimum must be satisfied.") \
3484 \
3485 product(intx, Tier4BackEdgeThreshold, 40000, \
3486 "Back edge threshold at which tier 4 OSR compilation is invoked") \
3487 \
3488 product(intx, Tier3DelayOn, 5, \
3489 "If C2 queue size grows over this amount per compiler thread " \
3490 "stop compiling at tier 3 and start compiling at tier 2") \
3491 \
3492 product(intx, Tier3DelayOff, 2, \
3493 "If C2 queue size is less than this amount per compiler thread " \
3494 "allow methods compiled at tier 2 transition to tier 3") \
3495 \
3496 product(intx, Tier3LoadFeedback, 5, \
3497 "Tier 3 thresholds will increase twofold when C1 queue size " \
3498 "reaches this amount per compiler thread") \
3499 \
3500 product(intx, Tier4LoadFeedback, 3, \
3501 "Tier 4 thresholds will increase twofold when C2 queue size " \
3502 "reaches this amount per compiler thread") \
3503 \
3504 product(intx, TieredCompileTaskTimeout, 50, \
3505 "Kill compile task if method was not used within " \
3506 "given timeout in milliseconds") \
3507 \
3508 product(intx, TieredStopAtLevel, 4, \
3509 "Stop at given compilation level") \
3510 \
3511 product(intx, Tier0ProfilingStartPercentage, 200, \
3512 "Start profiling in interpreter if the counters exceed tier 3" \
3513 "thresholds by the specified percentage") \
3514 \
3515 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
3516 "Increase the compile threshold for C1 compilation if the code" \
3517 "cache is filled by the specified percentage.") \
3518 \
3519 product(intx, TieredRateUpdateMinTime, 1, \
3520 "Minimum rate sampling interval (in milliseconds)") \
3521 \
3522 product(intx, TieredRateUpdateMaxTime, 25, \
3523 "Maximum rate sampling interval (in milliseconds)") \
3524 \
3525 product_pd(bool, TieredCompilation, \
3526 "Enable tiered compilation") \
3527 \
3528 product(bool, PrintTieredEvents, false, \
3529 "Print tiered events notifications") \
3530 \
3531 product_pd(intx, OnStackReplacePercentage, \
3532 "NON_TIERED number of method invocations/branches (expressed as %"\
3533 "of CompileThreshold) before (re-)compiling OSR code") \
3534 \
3535 product(intx, InterpreterProfilePercentage, 33, \
3536 "NON_TIERED number of method invocations/branches (expressed as %"\
3537 "of CompileThreshold) before profiling in the interpreter") \
3538 \
3539 develop(intx, MaxRecompilationSearchLength, 10, \
3540 "max. # frames to inspect searching for recompilee") \
3541 \
3542 develop(intx, MaxInterpretedSearchLength, 3, \
3543 "max. # interp. frames to skip when searching for recompilee") \
3544 \
3545 develop(intx, DesiredMethodLimit, 8000, \
3546 "desired max. method size (in bytecodes) after inlining") \
3547 \
3548 develop(intx, HugeMethodLimit, 8000, \
3549 "don't compile methods larger than this if " \
3550 "+DontCompileHugeMethods") \
3551 \
3552 /* New JDK 1.4 reflection implementation */ \
3553 \
3554 develop(bool, UseNewReflection, true, \
3555 "Temporary flag for transition to reflection based on dynamic " \
3556 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3557 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
3558 "changes were needed") \
3559 \
3560 develop(bool, VerifyReflectionBytecodes, false, \
3561 "Force verification of 1.4 reflection bytecodes. Does not work " \
3562 "in situations like that described in 4486457 or for " \
3563 "constructors generated for serialization, so can not be enabled "\
3564 "in product.") \
3565 \
3566 product(bool, ReflectionWrapResolutionErrors, true, \
3567 "Temporary flag for transition to AbstractMethodError wrapped " \
3568 "in InvocationTargetException. See 6531596") \
3569 \
3570 develop(bool, VerifyLambdaBytecodes, false, \
3571 "Force verification of jdk 8 lambda metafactory bytecodes.") \
3572 \
3573 develop(intx, FastSuperclassLimit, 8, \
3574 "Depth of hardwired instanceof accelerator array") \
3575 \
3576 /* Properties for Java libraries */ \
3577 \
3578 product(uintx, MaxDirectMemorySize, 0, \
3579 "Maximum total size of NIO direct-buffer allocations") \
3580 \
3581 /* temporary developer defined flags */ \
3582 \
3583 diagnostic(bool, UseNewCode, false, \
3584 "Testing Only: Use the new version while testing") \
3585 \
3586 diagnostic(bool, UseNewCode2, false, \
3587 "Testing Only: Use the new version while testing") \
3588 \
3589 diagnostic(bool, UseNewCode3, false, \
3590 "Testing Only: Use the new version while testing") \
3591 \
3592 /* flags for performance data collection */ \
3593 \
3594 product(bool, UsePerfData, falseInEmbedded, \
3595 "Flag to disable jvmstat instrumentation for performance testing" \
3596 "and problem isolation purposes.") \
3597 \
3598 product(bool, PerfDataSaveToFile, false, \
3599 "Save PerfData memory to hsperfdata_<pid> file on exit") \
3600 \
3601 product(ccstr, PerfDataSaveFile, NULL, \
3602 "Save PerfData memory to the specified absolute pathname," \
3603 "%p in the file name if present will be replaced by pid") \
3604 \
3605 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \
3606 "Data sampling interval in milliseconds") \
3607 \
3608 develop(bool, PerfTraceDataCreation, false, \
3609 "Trace creation of Performance Data Entries") \
3610 \
3611 develop(bool, PerfTraceMemOps, false, \
3612 "Trace PerfMemory create/attach/detach calls") \
3613 \
3614 product(bool, PerfDisableSharedMem, false, \
3615 "Store performance data in standard memory") \
3616 \
3617 product(intx, PerfDataMemorySize, 32*K, \
3618 "Size of performance data memory region. Will be rounded " \
3619 "up to a multiple of the native os page size.") \
3620 \
3621 product(intx, PerfMaxStringConstLength, 1024, \
3622 "Maximum PerfStringConstant string length before truncation") \
3623 \
3624 product(bool, PerfAllowAtExitRegistration, false, \
3625 "Allow registration of atexit() methods") \
3626 \
3627 product(bool, PerfBypassFileSystemCheck, false, \
3628 "Bypass Win32 file system criteria checks (Windows Only)") \
3629 \
3630 product(intx, UnguardOnExecutionViolation, 0, \
3631 "Unguard page and retry on no-execute fault (Win32 only)" \
3632 "0=off, 1=conservative, 2=aggressive") \
3633 \
3634 /* Serviceability Support */ \
3635 \
3636 product(bool, ManagementServer, false, \
3637 "Create JMX Management Server") \
3638 \
3639 product(bool, DisableAttachMechanism, false, \
3640 "Disable mechanism that allows tools to attach to this VM") \
3641 \
3642 product(bool, StartAttachListener, false, \
3643 "Always start Attach Listener at VM startup") \
3644 \
3645 manageable(bool, PrintConcurrentLocks, false, \
3646 "Print java.util.concurrent locks in thread dump") \
3647 \
3648 product(bool, TransmitErrorReport, false, \
3649 "Enable error report transmission on erroneous termination") \
3650 \
3651 product(ccstr, ErrorReportServer, NULL, \
3652 "Override built-in error report server address") \
3653 \
3654 /* Shared spaces */ \
3655 \
3656 product(bool, UseSharedSpaces, true, \
3657 "Use shared spaces for metadata") \
3658 \
3659 product(bool, RequireSharedSpaces, false, \
3660 "Require shared spaces for metadata") \
3661 \
3662 product(bool, DumpSharedSpaces, false, \
3663 "Special mode: JVM reads a class list, loads classes, builds " \
3664 "shared spaces, and dumps the shared spaces to a file to be " \
3665 "used in future JVM runs.") \
3666 \
3667 product(bool, PrintSharedSpaces, false, \
3668 "Print usage of shared spaces") \
3669 \
3670 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3671 "Size of read-write space for metadata (in bytes)") \
3672 \
3673 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
3674 "Size of read-only space for metadata (in bytes)") \
3675 \
3676 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
3677 "Size of the shared miscellaneous data area (in bytes)") \
3678 \
3679 product(uintx, SharedMiscCodeSize, 120*K, \
3680 "Size of the shared miscellaneous code area (in bytes)") \
3681 \
3682 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
3683 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
3684 "Address to allocate shared memory region for class data") \
3685 \
3686 diagnostic(bool, EnableInvokeDynamic, true, \
3687 "support JSR 292 (method handles, invokedynamic, " \
3688 "anonymous classes") \
3689 \
3690 diagnostic(bool, PrintMethodHandleStubs, false, \
3691 "Print generated stub code for method handles") \
3692 \
3693 develop(bool, TraceMethodHandles, false, \
3694 "trace internal method handle operations") \
3695 \
3696 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
3697 "perform extra checks when constructing method handles") \
3698 \
3699 diagnostic(bool, ShowHiddenFrames, false, \
3700 "show method handle implementation frames (usually hidden)") \
3701 \
3702 experimental(bool, TrustFinalNonStaticFields, false, \
3703 "trust final non-static declarations for constant folding") \
3704 \
3705 experimental(bool, FoldStableValues, false, \
3706 "Private flag to control optimizations for stable variables") \
3707 \
3708 develop(bool, TraceInvokeDynamic, false, \
3709 "trace internal invoke dynamic operations") \
3710 \
3711 diagnostic(bool, PauseAtStartup, false, \
3712 "Causes the VM to pause at startup time and wait for the pause " \
3713 "file to be removed (default: ./vm.paused.<pid>)") \
3714 \
3715 diagnostic(ccstr, PauseAtStartupFile, NULL, \
3716 "The file to create and for whose removal to await when pausing " \
3717 "at startup. (default: ./vm.paused.<pid>)") \
3718 \
3719 diagnostic(bool, PauseAtExit, false, \
3720 "Pause and wait for keypress on exit if a debugger is attached") \
3721 \
3722 product(bool, ExtendedDTraceProbes, false, \
3723 "Enable performance-impacting dtrace probes") \
3724 \
3725 product(bool, DTraceMethodProbes, false, \
3726 "Enable dtrace probes for method-entry and method-exit") \
3727 \
3728 product(bool, DTraceAllocProbes, false, \
3729 "Enable dtrace probes for object allocation") \
3730 \
3731 product(bool, DTraceMonitorProbes, false, \
3732 "Enable dtrace probes for monitor events") \
3733 \
3734 product(bool, RelaxAccessControlCheck, false, \
3735 "Relax the access control checks in the verifier") \
3736 \
3737 diagnostic(bool, PrintDTraceDOF, false, \
3738 "Print the DTrace DOF passed to the system for JSDT probes") \
3739 \
3740 product(uintx, StringTableSize, defaultStringTableSize, \
3741 "Number of buckets in the interned String table") \
3742 \
3743 develop(bool, TraceDefaultMethods, false, \
3744 "Trace the default method processing steps") \
3745 \
3746 develop(bool, VerifyGenericSignatures, false, \
3747 "Abort VM on erroneous or inconsistent generic signatures") \
3748 \
3749 product(bool, UseVMInterruptibleIO, false, \
3750 "(Unstable, Solaris-specific) Thread interrupt before or with " \
3751 "EINTR for I/O operations results in OS_INTRPT. The default value"\
3752 " of this flag is true for JDK 6 and earlier") \
3753 \
3754 diagnostic(bool, WhiteBoxAPI, false, \
3755 "Enable internal testing APIs") \
3756 \
3757 product(bool, PrintGCCause, true, \
3758 "Include GC cause in GC logging") \
3759 \
3760 product(bool , AllowNonVirtualCalls, false, \
3761 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
3762 \
3763 diagnostic(ccstr, SharedArchiveFile, NULL, \
3764 "Override the default location of the CDS archive file") \
3765 \
3766 experimental(uintx, ArrayAllocatorMallocLimit, \
3767 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \
3768 "Allocation less than this value will be allocated " \
3769 "using malloc. Larger allocations will use mmap.") \
3770 \
3771 product(bool, EnableTracing, false, \
3772 "Enable event-based tracing") \
3773 product(bool, UseLockedTracing, false, \
3774 "Use locked-tracing when doing event-based tracing")
3775
3776
3777 /*
3778 * Macros for factoring of globals
3779 */
3780
3781 // Interface macros
3782 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3783 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
3784 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3785 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3786 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3787 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3788 #ifdef PRODUCT
3789 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
3790 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
3791 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
3792 #else
3793 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
3794 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
3795 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3796 #endif
3797 // Special LP64 flags, product only needed for now.
3798 #ifdef _LP64
3799 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3800 #else
3801 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3802 #endif // _LP64
3803
3804 // Implementation macros
3805 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
3806 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
3807 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3808 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3809 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3810 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3811 #ifdef PRODUCT
3812 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
3813 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
3814 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
3815 #else
3816 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3817 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
3818 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3819 #endif
3820 #ifdef _LP64
3821 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3822 #else
3823 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3824 #endif // _LP64
3825
3826 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3827
3828 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3829
3830 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3831
3832 // Extensions
3833
3834 #include "runtime/globals_ext.hpp"
3835
3836 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP