1 /*
2 * Copyright (c) 2003, 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 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "oops/oop.inline.hpp"
29 #include "runtime/handles.inline.hpp"
30 #include "runtime/javaCalls.hpp"
31 #include "runtime/orderAccess.inline.hpp"
32 #include "services/lowMemoryDetector.hpp"
33 #include "services/management.hpp"
34 #include "services/memoryManager.hpp"
35 #include "services/memoryPool.hpp"
36 #include "services/memoryService.hpp"
37 #include "services/gcNotifier.hpp"
38 #include "utilities/dtrace.hpp"
39
40 MemoryManager::MemoryManager() {
41 _num_pools = 0;
42 (void)const_cast<instanceOop&>(_memory_mgr_obj = NULL);
43 }
44
45 void MemoryManager::add_pool(MemoryPool* pool) {
46 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max");
47 if (_num_pools < MemoryManager::max_num_pools) {
48 _pools[_num_pools] = pool;
49 _num_pools++;
50 }
51 pool->add_manager(this);
52 }
53
54 MemoryManager* MemoryManager::get_code_cache_memory_manager() {
55 return (MemoryManager*) new CodeCacheMemoryManager();
56 }
57
58 MemoryManager* MemoryManager::get_metaspace_memory_manager() {
59 return (MemoryManager*) new MetaspaceMemoryManager();
60 }
61
62 GCMemoryManager* MemoryManager::get_copy_memory_manager() {
63 return (GCMemoryManager*) new CopyMemoryManager();
64 }
65
66 GCMemoryManager* MemoryManager::get_msc_memory_manager() {
67 return (GCMemoryManager*) new MSCMemoryManager();
68 }
69
70 GCMemoryManager* MemoryManager::get_parnew_memory_manager() {
71 return (GCMemoryManager*) new ParNewMemoryManager();
72 }
73
74 GCMemoryManager* MemoryManager::get_cms_memory_manager() {
75 return (GCMemoryManager*) new CMSMemoryManager();
76 }
77
78 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() {
79 return (GCMemoryManager*) new PSScavengeMemoryManager();
80 }
81
82 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() {
83 return (GCMemoryManager*) new PSMarkSweepMemoryManager();
84 }
85
86 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() {
87 return (GCMemoryManager*) new G1YoungGenMemoryManager();
88 }
89
90 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() {
91 return (GCMemoryManager*) new G1OldGenMemoryManager();
92 }
93
94 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) {
95 // Must do an acquire so as to force ordering of subsequent
96 // loads from anything _memory_mgr_obj points to or implies.
97 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
98 if (mgr_obj == NULL) {
99 // It's ok for more than one thread to execute the code up to the locked region.
100 // Extra manager instances will just be gc'ed.
101 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_0);
102 instanceKlassHandle ik(THREAD, k);
103
104 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
105
106 JavaValue result(T_OBJECT);
107 JavaCallArguments args;
108 args.push_oop(mgr_name); // Argument 1
109
110 Symbol* method_name = NULL;
111 Symbol* signature = NULL;
112 if (is_gc_memory_manager()) {
113 method_name = vmSymbols::createGarbageCollector_name();
114 signature = vmSymbols::createGarbageCollector_signature();
115 args.push_oop(Handle()); // Argument 2 (for future extension)
116 } else {
117 method_name = vmSymbols::createMemoryManager_name();
118 signature = vmSymbols::createMemoryManager_signature();
119 }
120
121 JavaCalls::call_static(&result,
122 ik,
123 method_name,
124 signature,
125 &args,
126 CHECK_0);
127
128 instanceOop m = (instanceOop) result.get_jobject();
129 instanceHandle mgr(THREAD, m);
130
131 {
132 // Get lock before setting _memory_mgr_obj
133 // since another thread may have created the instance
134 MutexLocker ml(Management_lock);
135
136 // Check if another thread has created the management object. We reload
137 // _memory_mgr_obj here because some other thread may have initialized
138 // it while we were executing the code before the lock.
139 //
140 // The lock has done an acquire, so the load can't float above it, but
141 // we need to do a load_acquire as above.
142 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
143 if (mgr_obj != NULL) {
144 return mgr_obj;
145 }
146
147 // Get the address of the object we created via call_special.
148 mgr_obj = mgr();
149
150 // Use store barrier to make sure the memory accesses associated
151 // with creating the management object are visible before publishing
152 // its address. The unlock will publish the store to _memory_mgr_obj
153 // because it does a release first.
154 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
155 }
156 }
157
158 return mgr_obj;
159 }
160
161 void MemoryManager::oops_do(OopClosure* f) {
162 f->do_oop((oop*) &_memory_mgr_obj);
163 }
164
165 GCStatInfo::GCStatInfo(int num_pools) {
166 // initialize the arrays for memory usage
167 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
168 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
169 _usage_array_size = num_pools;
170 clear();
171 }
172
173 GCStatInfo::~GCStatInfo() {
174 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array, mtInternal);
175 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array, mtInternal);
176 }
177
178 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
179 MemoryUsage* gc_usage_array;
180 if (before_gc) {
181 gc_usage_array = _before_gc_usage_array;
182 } else {
183 gc_usage_array = _after_gc_usage_array;
184 }
185 gc_usage_array[pool_index] = usage;
186 }
187
188 void GCStatInfo::clear() {
189 _index = 0;
190 _start_time = 0L;
191 _end_time = 0L;
192 size_t len = _usage_array_size * sizeof(MemoryUsage);
193 memset(_before_gc_usage_array, 0, len);
194 memset(_after_gc_usage_array, 0, len);
195 }
196
197
198 GCMemoryManager::GCMemoryManager() : MemoryManager() {
199 _num_collections = 0;
200 _last_gc_stat = NULL;
201 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true);
202 _current_gc_stat = NULL;
203 _num_gc_threads = 1;
204 _notification_enabled = false;
205 }
206
207 GCMemoryManager::~GCMemoryManager() {
208 delete _last_gc_stat;
209 delete _last_gc_lock;
210 delete _current_gc_stat;
211 }
212
213 void GCMemoryManager::initialize_gc_stat_info() {
214 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
215 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
216 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
217 // tracking concurrent collections we need two objects: one to update, and one to
218 // hold the publicly available "last (completed) gc" information.
219 }
220
221 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
222 bool recordAccumulatedGCTime) {
223 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
224 if (recordAccumulatedGCTime) {
225 _accumulated_timer.start();
226 }
227 // _num_collections now increases in gc_end, to count completed collections
228 if (recordGCBeginTime) {
229 _current_gc_stat->set_index(_num_collections+1);
230 _current_gc_stat->set_start_time(Management::timestamp());
231 }
232
233 if (recordPreGCUsage) {
234 // Keep memory usage of all memory pools
235 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
236 MemoryPool* pool = MemoryService::get_memory_pool(i);
237 MemoryUsage usage = pool->get_memory_usage();
238 _current_gc_stat->set_before_gc_usage(i, usage);
239 HOTSPOT_MEM_POOL_GC_BEGIN(
240 (char *) name(), strlen(name()),
241 (char *) pool->name(), strlen(pool->name()),
242 usage.init_size(), usage.used(),
243 usage.committed(), usage.max_size());
244 }
245 }
246 }
247
248 // A collector MUST, even if it does not complete for some reason,
249 // make a TraceMemoryManagerStats object where countCollection is true,
250 // to ensure the current gc stat is placed in _last_gc_stat.
251 void GCMemoryManager::gc_end(bool recordPostGCUsage,
252 bool recordAccumulatedGCTime,
253 bool recordGCEndTime, bool countCollection,
254 GCCause::Cause cause) {
255 if (recordAccumulatedGCTime) {
256 _accumulated_timer.stop();
257 }
258 if (recordGCEndTime) {
259 _current_gc_stat->set_end_time(Management::timestamp());
260 }
261
262 if (recordPostGCUsage) {
263 int i;
264 // keep the last gc statistics for all memory pools
265 for (i = 0; i < MemoryService::num_memory_pools(); i++) {
266 MemoryPool* pool = MemoryService::get_memory_pool(i);
267 MemoryUsage usage = pool->get_memory_usage();
268
269 HOTSPOT_MEM_POOL_GC_END(
270 (char *) name(), strlen(name()),
271 (char *) pool->name(), strlen(pool->name()),
272 usage.init_size(), usage.used(),
273 usage.committed(), usage.max_size());
274
275 _current_gc_stat->set_after_gc_usage(i, usage);
276 }
277
278 // Set last collection usage of the memory pools managed by this collector
279 for (i = 0; i < num_memory_pools(); i++) {
280 MemoryPool* pool = get_memory_pool(i);
281 MemoryUsage usage = pool->get_memory_usage();
282
283 // Compare with GC usage threshold
284 pool->set_last_collection_usage(usage);
285 LowMemoryDetector::detect_after_gc_memory(pool);
286 }
287 }
288
289 if (countCollection) {
290 _num_collections++;
291 // alternately update two objects making one public when complete
292 {
293 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
294 GCStatInfo *tmp = _last_gc_stat;
295 _last_gc_stat = _current_gc_stat;
296 _current_gc_stat = tmp;
297 // reset the current stat for diagnosability purposes
298 _current_gc_stat->clear();
299 }
300
301 if (is_notification_enabled()) {
302 bool isMajorGC = this == MemoryService::get_major_gc_manager();
303 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC",
304 GCCause::to_string(cause));
305 }
306 }
307 }
308
309 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) {
310 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
311 if (_last_gc_stat->gc_index() != 0) {
312 dest->set_index(_last_gc_stat->gc_index());
313 dest->set_start_time(_last_gc_stat->start_time());
314 dest->set_end_time(_last_gc_stat->end_time());
315 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(),
316 "Must have same array size");
317 size_t len = dest->usage_array_size() * sizeof(MemoryUsage);
318 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len);
319 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len);
320 }
321 return _last_gc_stat->gc_index();
322 }