1 /*
2 * Copyright (c) 2003, 2012, 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 "services/lowMemoryDetector.hpp"
32 #include "services/management.hpp"
33 #include "services/memoryManager.hpp"
34 #include "services/memoryPool.hpp"
35 #include "services/memoryService.hpp"
36 #include "services/gcNotifier.hpp"
37 #include "utilities/dtrace.hpp"
38
39 #ifndef USDT2
40 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int,
41 size_t, size_t, size_t, size_t);
42 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int,
43 size_t, size_t, size_t, size_t);
44 #endif /* !USDT2 */
45
46 MemoryManager::MemoryManager() {
47 _num_pools = 0;
48 _memory_mgr_obj = NULL;
49 }
50
51 void MemoryManager::add_pool(MemoryPool* pool) {
52 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max");
53 if (_num_pools < MemoryManager::max_num_pools) {
54 _pools[_num_pools] = pool;
55 _num_pools++;
56 }
57 pool->add_manager(this);
58 }
59
60 MemoryManager* MemoryManager::get_code_cache_memory_manager() {
61 return (MemoryManager*) new CodeCacheMemoryManager();
62 }
63
64 MemoryManager* MemoryManager::get_metaspace_memory_manager() {
65 return (MemoryManager*) new MetaspaceMemoryManager();
66 }
67
68 GCMemoryManager* MemoryManager::get_copy_memory_manager() {
69 return (GCMemoryManager*) new CopyMemoryManager();
70 }
71
72 GCMemoryManager* MemoryManager::get_msc_memory_manager() {
73 return (GCMemoryManager*) new MSCMemoryManager();
74 }
75
76 GCMemoryManager* MemoryManager::get_parnew_memory_manager() {
77 return (GCMemoryManager*) new ParNewMemoryManager();
78 }
79
80 GCMemoryManager* MemoryManager::get_cms_memory_manager() {
81 return (GCMemoryManager*) new CMSMemoryManager();
82 }
83
84 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() {
85 return (GCMemoryManager*) new PSScavengeMemoryManager();
86 }
87
88 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() {
89 return (GCMemoryManager*) new PSMarkSweepMemoryManager();
90 }
91
92 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() {
93 return (GCMemoryManager*) new G1YoungGenMemoryManager();
94 }
95
96 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() {
97 return (GCMemoryManager*) new G1OldGenMemoryManager();
98 }
99
100 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) {
101 // Must do an acquire so as to force ordering of subsequent
102 // loads from anything _memory_mgr_obj points to or implies.
103 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
104 if (mgr_obj == NULL) {
105 // It's ok for more than one thread to execute the code up to the locked region.
106 // Extra manager instances will just be gc'ed.
107 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_0);
108 instanceKlassHandle ik(THREAD, k);
109
110 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
111
112 JavaValue result(T_OBJECT);
113 JavaCallArguments args;
114 args.push_oop(mgr_name); // Argument 1
115
116 Symbol* method_name = NULL;
117 Symbol* signature = NULL;
118 if (is_gc_memory_manager()) {
119 method_name = vmSymbols::createGarbageCollector_name();
120 signature = vmSymbols::createGarbageCollector_signature();
121 args.push_oop(Handle()); // Argument 2 (for future extension)
122 } else {
123 method_name = vmSymbols::createMemoryManager_name();
124 signature = vmSymbols::createMemoryManager_signature();
125 }
126
127 JavaCalls::call_static(&result,
128 ik,
129 method_name,
130 signature,
131 &args,
132 CHECK_0);
133
134 instanceOop m = (instanceOop) result.get_jobject();
135 instanceHandle mgr(THREAD, m);
136
137 {
138 // Get lock before setting _memory_mgr_obj
139 // since another thread may have created the instance
140 MutexLocker ml(Management_lock);
141
142 // Check if another thread has created the management object. We reload
143 // _memory_mgr_obj here because some other thread may have initialized
144 // it while we were executing the code before the lock.
145 //
146 // The lock has done an acquire, so the load can't float above it, but
147 // we need to do a load_acquire as above.
148 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
149 if (mgr_obj != NULL) {
150 return mgr_obj;
151 }
152
153 // Get the address of the object we created via call_special.
154 mgr_obj = mgr();
155
156 // Use store barrier to make sure the memory accesses associated
157 // with creating the management object are visible before publishing
158 // its address. The unlock will publish the store to _memory_mgr_obj
159 // because it does a release first.
160 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
161 }
162 }
163
164 return mgr_obj;
165 }
166
167 void MemoryManager::oops_do(OopClosure* f) {
168 f->do_oop((oop*) &_memory_mgr_obj);
169 }
170
171 GCStatInfo::GCStatInfo(int num_pools) {
172 // initialize the arrays for memory usage
173 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
174 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
175 _usage_array_size = num_pools;
176 clear();
177 }
178
179 GCStatInfo::~GCStatInfo() {
180 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array, mtInternal);
181 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array, mtInternal);
182 }
183
184 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
185 MemoryUsage* gc_usage_array;
186 if (before_gc) {
187 gc_usage_array = _before_gc_usage_array;
188 } else {
189 gc_usage_array = _after_gc_usage_array;
190 }
191 gc_usage_array[pool_index] = usage;
192 }
193
194 void GCStatInfo::clear() {
195 _index = 0;
196 _start_time = 0L;
197 _end_time = 0L;
198 size_t len = _usage_array_size * sizeof(MemoryUsage);
199 memset(_before_gc_usage_array, 0, len);
200 memset(_after_gc_usage_array, 0, len);
201 }
202
203
204 GCMemoryManager::GCMemoryManager() : MemoryManager() {
205 _num_collections = 0;
206 _last_gc_stat = NULL;
207 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true);
208 _current_gc_stat = NULL;
209 _num_gc_threads = 1;
210 _notification_enabled = false;
211 }
212
213 GCMemoryManager::~GCMemoryManager() {
214 delete _last_gc_stat;
215 delete _last_gc_lock;
216 delete _current_gc_stat;
217 }
218
219 void GCMemoryManager::initialize_gc_stat_info() {
220 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
221 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
222 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
223 // tracking concurrent collections we need two objects: one to update, and one to
224 // hold the publicly available "last (completed) gc" information.
225 }
226
227 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
228 bool recordAccumulatedGCTime) {
229 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
230 if (recordAccumulatedGCTime) {
231 _accumulated_timer.start();
232 }
233 // _num_collections now increases in gc_end, to count completed collections
234 if (recordGCBeginTime) {
235 _current_gc_stat->set_index(_num_collections+1);
236 _current_gc_stat->set_start_time(Management::timestamp());
237 }
238
239 if (recordPreGCUsage) {
240 // Keep memory usage of all memory pools
241 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
242 MemoryPool* pool = MemoryService::get_memory_pool(i);
243 MemoryUsage usage = pool->get_memory_usage();
244 _current_gc_stat->set_before_gc_usage(i, usage);
245 #ifndef USDT2
246 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
247 name(), strlen(name()),
248 pool->name(), strlen(pool->name()),
249 usage.init_size(), usage.used(),
250 usage.committed(), usage.max_size());
251 #else /* USDT2 */
252 HOTSPOT_MEM_POOL_GC_BEGIN(
253 (char *) name(), strlen(name()),
254 (char *) pool->name(), strlen(pool->name()),
255 usage.init_size(), usage.used(),
256 usage.committed(), usage.max_size());
257 #endif /* USDT2 */
258 }
259 }
260 }
261
262 // A collector MUST, even if it does not complete for some reason,
263 // make a TraceMemoryManagerStats object where countCollection is true,
264 // to ensure the current gc stat is placed in _last_gc_stat.
265 void GCMemoryManager::gc_end(bool recordPostGCUsage,
266 bool recordAccumulatedGCTime,
267 bool recordGCEndTime, bool countCollection,
268 GCCause::Cause cause) {
269 if (recordAccumulatedGCTime) {
270 _accumulated_timer.stop();
271 }
272 if (recordGCEndTime) {
273 _current_gc_stat->set_end_time(Management::timestamp());
274 }
275
276 if (recordPostGCUsage) {
277 int i;
278 // keep the last gc statistics for all memory pools
279 for (i = 0; i < MemoryService::num_memory_pools(); i++) {
280 MemoryPool* pool = MemoryService::get_memory_pool(i);
281 MemoryUsage usage = pool->get_memory_usage();
282
283 #ifndef USDT2
284 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
285 name(), strlen(name()),
286 pool->name(), strlen(pool->name()),
287 usage.init_size(), usage.used(),
288 usage.committed(), usage.max_size());
289 #else /* USDT2 */
290 HOTSPOT_MEM_POOL_GC_END(
291 (char *) name(), strlen(name()),
292 (char *) pool->name(), strlen(pool->name()),
293 usage.init_size(), usage.used(),
294 usage.committed(), usage.max_size());
295 #endif /* USDT2 */
296
297 _current_gc_stat->set_after_gc_usage(i, usage);
298 }
299
300 // Set last collection usage of the memory pools managed by this collector
301 for (i = 0; i < num_memory_pools(); i++) {
302 MemoryPool* pool = get_memory_pool(i);
303 MemoryUsage usage = pool->get_memory_usage();
304
305 // Compare with GC usage threshold
306 pool->set_last_collection_usage(usage);
307 LowMemoryDetector::detect_after_gc_memory(pool);
308 }
309 }
310
311 if (countCollection) {
312 _num_collections++;
313 // alternately update two objects making one public when complete
314 {
315 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
316 GCStatInfo *tmp = _last_gc_stat;
317 _last_gc_stat = _current_gc_stat;
318 _current_gc_stat = tmp;
319 // reset the current stat for diagnosability purposes
320 _current_gc_stat->clear();
321 }
322
323 if (is_notification_enabled()) {
324 bool isMajorGC = this == MemoryService::get_major_gc_manager();
325 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC",
326 GCCause::to_string(cause));
327 }
328 }
329 }
330
331 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) {
332 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
333 if (_last_gc_stat->gc_index() != 0) {
334 dest->set_index(_last_gc_stat->gc_index());
335 dest->set_start_time(_last_gc_stat->start_time());
336 dest->set_end_time(_last_gc_stat->end_time());
337 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(),
338 "Must have same array size");
339 size_t len = dest->usage_array_size() * sizeof(MemoryUsage);
340 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len);
341 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len);
342 }
343 return _last_gc_stat->gc_index();
344 }