1 /*
2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #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 = instanceOop(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_ManagementFactoryHelper_klass(CHECK_0);
102
103 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
104
105 JavaValue result(T_OBJECT);
106 JavaCallArguments args;
107 args.push_oop(mgr_name); // Argument 1
108
109 Symbol* method_name = NULL;
110 Symbol* signature = NULL;
111 if (is_gc_memory_manager()) {
112 Klass* extKlass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK_0);
113 // com.sun.management.GarbageCollectorMXBean is in jdk.management module which may not be present.
114 if (extKlass != NULL) {
115 k = extKlass;
116 }
117
118 method_name = vmSymbols::createGarbageCollector_name();
119
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 InstanceKlass* ik = InstanceKlass::cast(k);
128
129 JavaCalls::call_static(&result,
130 ik,
131 method_name,
132 signature,
133 &args,
134 CHECK_0);
135
136 instanceOop m = (instanceOop) result.get_jobject();
137 instanceHandle mgr(THREAD, m);
138
139 {
140 // Get lock before setting _memory_mgr_obj
141 // since another thread may have created the instance
142 MutexLocker ml(Management_lock);
143
144 // Check if another thread has created the management object. We reload
145 // _memory_mgr_obj here because some other thread may have initialized
146 // it while we were executing the code before the lock.
147 //
148 // The lock has done an acquire, so the load can't float above it, but
149 // we need to do a load_acquire as above.
150 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
151 if (mgr_obj != NULL) {
152 return mgr_obj;
153 }
154
155 // Get the address of the object we created via call_special.
156 mgr_obj = mgr();
157
158 // Use store barrier to make sure the memory accesses associated
159 // with creating the management object are visible before publishing
160 // its address. The unlock will publish the store to _memory_mgr_obj
161 // because it does a release first.
162 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
163 }
164 }
165
166 return mgr_obj;
167 }
168
169 void MemoryManager::oops_do(OopClosure* f) {
170 f->do_oop((oop*) &_memory_mgr_obj);
171 }
172
173 GCStatInfo::GCStatInfo(int num_pools) {
174 // initialize the arrays for memory usage
175 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
176 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
177 _usage_array_size = num_pools;
178 clear();
179 }
180
181 GCStatInfo::~GCStatInfo() {
182 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array);
183 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array);
184 }
185
186 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
187 MemoryUsage* gc_usage_array;
188 if (before_gc) {
189 gc_usage_array = _before_gc_usage_array;
190 } else {
191 gc_usage_array = _after_gc_usage_array;
192 }
193 gc_usage_array[pool_index] = usage;
194 }
195
196 void GCStatInfo::clear() {
197 _index = 0;
198 _start_time = 0L;
199 _end_time = 0L;
200 size_t len = _usage_array_size * sizeof(MemoryUsage);
201 memset(_before_gc_usage_array, 0, len);
202 memset(_after_gc_usage_array, 0, len);
203 }
204
205
206 GCMemoryManager::GCMemoryManager() : MemoryManager() {
207 _num_collections = 0;
208 _last_gc_stat = NULL;
209 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true,
210 Monitor::_safepoint_check_never);
211 _current_gc_stat = NULL;
212 _num_gc_threads = 1;
213 _notification_enabled = false;
214 }
215
216 GCMemoryManager::~GCMemoryManager() {
217 delete _last_gc_stat;
218 delete _last_gc_lock;
219 delete _current_gc_stat;
220 }
221
222 void GCMemoryManager::initialize_gc_stat_info() {
223 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
224 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
225 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
226 // tracking concurrent collections we need two objects: one to update, and one to
227 // hold the publicly available "last (completed) gc" information.
228 }
229
230 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
231 bool recordAccumulatedGCTime) {
232 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
233 if (recordAccumulatedGCTime) {
234 _accumulated_timer.start();
235 }
236 // _num_collections now increases in gc_end, to count completed collections
237 if (recordGCBeginTime) {
238 _current_gc_stat->set_index(_num_collections+1);
239 _current_gc_stat->set_start_time(Management::timestamp());
240 }
241
242 if (recordPreGCUsage) {
243 // Keep memory usage of all memory pools
244 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
245 MemoryPool* pool = MemoryService::get_memory_pool(i);
246 MemoryUsage usage = pool->get_memory_usage();
247 _current_gc_stat->set_before_gc_usage(i, usage);
248 HOTSPOT_MEM_POOL_GC_BEGIN(
249 (char *) name(), strlen(name()),
250 (char *) pool->name(), strlen(pool->name()),
251 usage.init_size(), usage.used(),
252 usage.committed(), usage.max_size());
253 }
254 }
255 }
256
257 // A collector MUST, even if it does not complete for some reason,
258 // make a TraceMemoryManagerStats object where countCollection is true,
259 // to ensure the current gc stat is placed in _last_gc_stat.
260 void GCMemoryManager::gc_end(bool recordPostGCUsage,
261 bool recordAccumulatedGCTime,
262 bool recordGCEndTime, bool countCollection,
263 GCCause::Cause cause) {
264 if (recordAccumulatedGCTime) {
265 _accumulated_timer.stop();
266 }
267 if (recordGCEndTime) {
268 _current_gc_stat->set_end_time(Management::timestamp());
269 }
270
271 if (recordPostGCUsage) {
272 int i;
273 // keep the last gc statistics for all memory pools
274 for (i = 0; i < MemoryService::num_memory_pools(); i++) {
275 MemoryPool* pool = MemoryService::get_memory_pool(i);
276 MemoryUsage usage = pool->get_memory_usage();
277
278 HOTSPOT_MEM_POOL_GC_END(
279 (char *) name(), strlen(name()),
280 (char *) pool->name(), strlen(pool->name()),
281 usage.init_size(), usage.used(),
282 usage.committed(), usage.max_size());
283
284 _current_gc_stat->set_after_gc_usage(i, usage);
285 }
286
287 // Set last collection usage of the memory pools managed by this collector
288 for (i = 0; i < num_memory_pools(); i++) {
289 MemoryPool* pool = get_memory_pool(i);
290 MemoryUsage usage = pool->get_memory_usage();
291
292 // Compare with GC usage threshold
293 pool->set_last_collection_usage(usage);
294 LowMemoryDetector::detect_after_gc_memory(pool);
295 }
296 }
297
298 if (countCollection) {
299 _num_collections++;
300 // alternately update two objects making one public when complete
301 {
302 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
303 GCStatInfo *tmp = _last_gc_stat;
304 _last_gc_stat = _current_gc_stat;
305 _current_gc_stat = tmp;
306 // reset the current stat for diagnosability purposes
307 _current_gc_stat->clear();
308 }
309
310 if (is_notification_enabled()) {
311 bool isMajorGC = this == MemoryService::get_major_gc_manager();
312 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC",
313 GCCause::to_string(cause));
314 }
315 }
316 }
317
318 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) {
319 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
320 if (_last_gc_stat->gc_index() != 0) {
321 dest->set_index(_last_gc_stat->gc_index());
322 dest->set_start_time(_last_gc_stat->start_time());
323 dest->set_end_time(_last_gc_stat->end_time());
324 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(),
325 "Must have same array size");
326 size_t len = dest->usage_array_size() * sizeof(MemoryUsage);
327 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len);
328 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len);
329 }
330 return _last_gc_stat->gc_index();
331 }
--- EOF ---