Wed, 27 Aug 2014 09:36:55 +0200
Merge
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 */
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"
40 #ifndef USDT2
41 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int,
42 size_t, size_t, size_t, size_t);
43 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int,
44 size_t, size_t, size_t, size_t);
45 #endif /* !USDT2 */
47 MemoryManager::MemoryManager() {
48 _num_pools = 0;
49 (void)const_cast<instanceOop&>(_memory_mgr_obj = NULL);
50 }
52 void MemoryManager::add_pool(MemoryPool* pool) {
53 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max");
54 if (_num_pools < MemoryManager::max_num_pools) {
55 _pools[_num_pools] = pool;
56 _num_pools++;
57 }
58 pool->add_manager(this);
59 }
61 MemoryManager* MemoryManager::get_code_cache_memory_manager() {
62 return (MemoryManager*) new CodeCacheMemoryManager();
63 }
65 MemoryManager* MemoryManager::get_metaspace_memory_manager() {
66 return (MemoryManager*) new MetaspaceMemoryManager();
67 }
69 GCMemoryManager* MemoryManager::get_copy_memory_manager() {
70 return (GCMemoryManager*) new CopyMemoryManager();
71 }
73 GCMemoryManager* MemoryManager::get_msc_memory_manager() {
74 return (GCMemoryManager*) new MSCMemoryManager();
75 }
77 GCMemoryManager* MemoryManager::get_parnew_memory_manager() {
78 return (GCMemoryManager*) new ParNewMemoryManager();
79 }
81 GCMemoryManager* MemoryManager::get_cms_memory_manager() {
82 return (GCMemoryManager*) new CMSMemoryManager();
83 }
85 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() {
86 return (GCMemoryManager*) new PSScavengeMemoryManager();
87 }
89 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() {
90 return (GCMemoryManager*) new PSMarkSweepMemoryManager();
91 }
93 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() {
94 return (GCMemoryManager*) new G1YoungGenMemoryManager();
95 }
97 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() {
98 return (GCMemoryManager*) new G1OldGenMemoryManager();
99 }
101 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) {
102 // Must do an acquire so as to force ordering of subsequent
103 // loads from anything _memory_mgr_obj points to or implies.
104 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
105 if (mgr_obj == NULL) {
106 // It's ok for more than one thread to execute the code up to the locked region.
107 // Extra manager instances will just be gc'ed.
108 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_0);
109 instanceKlassHandle ik(THREAD, k);
111 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
113 JavaValue result(T_OBJECT);
114 JavaCallArguments args;
115 args.push_oop(mgr_name); // Argument 1
117 Symbol* method_name = NULL;
118 Symbol* signature = NULL;
119 if (is_gc_memory_manager()) {
120 method_name = vmSymbols::createGarbageCollector_name();
121 signature = vmSymbols::createGarbageCollector_signature();
122 args.push_oop(Handle()); // Argument 2 (for future extension)
123 } else {
124 method_name = vmSymbols::createMemoryManager_name();
125 signature = vmSymbols::createMemoryManager_signature();
126 }
128 JavaCalls::call_static(&result,
129 ik,
130 method_name,
131 signature,
132 &args,
133 CHECK_0);
135 instanceOop m = (instanceOop) result.get_jobject();
136 instanceHandle mgr(THREAD, m);
138 {
139 // Get lock before setting _memory_mgr_obj
140 // since another thread may have created the instance
141 MutexLocker ml(Management_lock);
143 // Check if another thread has created the management object. We reload
144 // _memory_mgr_obj here because some other thread may have initialized
145 // it while we were executing the code before the lock.
146 //
147 // The lock has done an acquire, so the load can't float above it, but
148 // we need to do a load_acquire as above.
149 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
150 if (mgr_obj != NULL) {
151 return mgr_obj;
152 }
154 // Get the address of the object we created via call_special.
155 mgr_obj = mgr();
157 // Use store barrier to make sure the memory accesses associated
158 // with creating the management object are visible before publishing
159 // its address. The unlock will publish the store to _memory_mgr_obj
160 // because it does a release first.
161 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
162 }
163 }
165 return mgr_obj;
166 }
168 void MemoryManager::oops_do(OopClosure* f) {
169 f->do_oop((oop*) &_memory_mgr_obj);
170 }
172 GCStatInfo::GCStatInfo(int num_pools) {
173 // initialize the arrays for memory usage
174 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
175 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
176 _usage_array_size = num_pools;
177 clear();
178 }
180 GCStatInfo::~GCStatInfo() {
181 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array, mtInternal);
182 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array, mtInternal);
183 }
185 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
186 MemoryUsage* gc_usage_array;
187 if (before_gc) {
188 gc_usage_array = _before_gc_usage_array;
189 } else {
190 gc_usage_array = _after_gc_usage_array;
191 }
192 gc_usage_array[pool_index] = usage;
193 }
195 void GCStatInfo::clear() {
196 _index = 0;
197 _start_time = 0L;
198 _end_time = 0L;
199 size_t len = _usage_array_size * sizeof(MemoryUsage);
200 memset(_before_gc_usage_array, 0, len);
201 memset(_after_gc_usage_array, 0, len);
202 }
205 GCMemoryManager::GCMemoryManager() : MemoryManager() {
206 _num_collections = 0;
207 _last_gc_stat = NULL;
208 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true);
209 _current_gc_stat = NULL;
210 _num_gc_threads = 1;
211 _notification_enabled = false;
212 }
214 GCMemoryManager::~GCMemoryManager() {
215 delete _last_gc_stat;
216 delete _last_gc_lock;
217 delete _current_gc_stat;
218 }
220 void GCMemoryManager::initialize_gc_stat_info() {
221 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
222 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
223 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
224 // tracking concurrent collections we need two objects: one to update, and one to
225 // hold the publicly available "last (completed) gc" information.
226 }
228 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
229 bool recordAccumulatedGCTime) {
230 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
231 if (recordAccumulatedGCTime) {
232 _accumulated_timer.start();
233 }
234 // _num_collections now increases in gc_end, to count completed collections
235 if (recordGCBeginTime) {
236 _current_gc_stat->set_index(_num_collections+1);
237 _current_gc_stat->set_start_time(Management::timestamp());
238 }
240 if (recordPreGCUsage) {
241 // Keep memory usage of all memory pools
242 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
243 MemoryPool* pool = MemoryService::get_memory_pool(i);
244 MemoryUsage usage = pool->get_memory_usage();
245 _current_gc_stat->set_before_gc_usage(i, usage);
246 #ifndef USDT2
247 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
248 name(), strlen(name()),
249 pool->name(), strlen(pool->name()),
250 usage.init_size(), usage.used(),
251 usage.committed(), usage.max_size());
252 #else /* USDT2 */
253 HOTSPOT_MEM_POOL_GC_BEGIN(
254 (char *) name(), strlen(name()),
255 (char *) pool->name(), strlen(pool->name()),
256 usage.init_size(), usage.used(),
257 usage.committed(), usage.max_size());
258 #endif /* USDT2 */
259 }
260 }
261 }
263 // A collector MUST, even if it does not complete for some reason,
264 // make a TraceMemoryManagerStats object where countCollection is true,
265 // to ensure the current gc stat is placed in _last_gc_stat.
266 void GCMemoryManager::gc_end(bool recordPostGCUsage,
267 bool recordAccumulatedGCTime,
268 bool recordGCEndTime, bool countCollection,
269 GCCause::Cause cause) {
270 if (recordAccumulatedGCTime) {
271 _accumulated_timer.stop();
272 }
273 if (recordGCEndTime) {
274 _current_gc_stat->set_end_time(Management::timestamp());
275 }
277 if (recordPostGCUsage) {
278 int i;
279 // keep the last gc statistics for all memory pools
280 for (i = 0; i < MemoryService::num_memory_pools(); i++) {
281 MemoryPool* pool = MemoryService::get_memory_pool(i);
282 MemoryUsage usage = pool->get_memory_usage();
284 #ifndef USDT2
285 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
286 name(), strlen(name()),
287 pool->name(), strlen(pool->name()),
288 usage.init_size(), usage.used(),
289 usage.committed(), usage.max_size());
290 #else /* USDT2 */
291 HOTSPOT_MEM_POOL_GC_END(
292 (char *) name(), strlen(name()),
293 (char *) pool->name(), strlen(pool->name()),
294 usage.init_size(), usage.used(),
295 usage.committed(), usage.max_size());
296 #endif /* USDT2 */
298 _current_gc_stat->set_after_gc_usage(i, usage);
299 }
301 // Set last collection usage of the memory pools managed by this collector
302 for (i = 0; i < num_memory_pools(); i++) {
303 MemoryPool* pool = get_memory_pool(i);
304 MemoryUsage usage = pool->get_memory_usage();
306 // Compare with GC usage threshold
307 pool->set_last_collection_usage(usage);
308 LowMemoryDetector::detect_after_gc_memory(pool);
309 }
310 }
312 if (countCollection) {
313 _num_collections++;
314 // alternately update two objects making one public when complete
315 {
316 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
317 GCStatInfo *tmp = _last_gc_stat;
318 _last_gc_stat = _current_gc_stat;
319 _current_gc_stat = tmp;
320 // reset the current stat for diagnosability purposes
321 _current_gc_stat->clear();
322 }
324 if (is_notification_enabled()) {
325 bool isMajorGC = this == MemoryService::get_major_gc_manager();
326 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC",
327 GCCause::to_string(cause));
328 }
329 }
330 }
332 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) {
333 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
334 if (_last_gc_stat->gc_index() != 0) {
335 dest->set_index(_last_gc_stat->gc_index());
336 dest->set_start_time(_last_gc_stat->start_time());
337 dest->set_end_time(_last_gc_stat->end_time());
338 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(),
339 "Must have same array size");
340 size_t len = dest->usage_array_size() * sizeof(MemoryUsage);
341 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len);
342 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len);
343 }
344 return _last_gc_stat->gc_index();
345 }