1 /*
2 * Copyright (c) 2003, 2018, 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 #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 */
46
47 MemoryManager::MemoryManager() {
48 _num_pools = 0;
49 (void)const_cast<instanceOop&>(_memory_mgr_obj = instanceOop(NULL));
50 }
51
52 int MemoryManager::add_pool(MemoryPool* pool) {
53 int index = _num_pools;
54 assert(index < MemoryManager::max_num_pools, "_num_pools exceeds the max");
55 if (index < MemoryManager::max_num_pools) {
56 _pools[index] = pool;
57 _num_pools++;
58 }
59 pool->add_manager(this);
60 return index;
61 }
62
63 MemoryManager* MemoryManager::get_code_cache_memory_manager() {
64 return (MemoryManager*) new CodeCacheMemoryManager();
65 }
66
67 MemoryManager* MemoryManager::get_metaspace_memory_manager() {
68 return (MemoryManager*) new MetaspaceMemoryManager();
69 }
70
71 GCMemoryManager* MemoryManager::get_copy_memory_manager() {
72 return (GCMemoryManager*) new CopyMemoryManager();
73 }
74
75 GCMemoryManager* MemoryManager::get_msc_memory_manager() {
76 return (GCMemoryManager*) new MSCMemoryManager();
77 }
78
79 GCMemoryManager* MemoryManager::get_parnew_memory_manager() {
80 return (GCMemoryManager*) new ParNewMemoryManager();
81 }
82
83 GCMemoryManager* MemoryManager::get_cms_memory_manager() {
84 return (GCMemoryManager*) new CMSMemoryManager();
85 }
86
87 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() {
88 return (GCMemoryManager*) new PSScavengeMemoryManager();
89 }
90
91 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() {
92 return (GCMemoryManager*) new PSMarkSweepMemoryManager();
93 }
94
95 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() {
96 return (GCMemoryManager*) new G1YoungGenMemoryManager();
97 }
98
99 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() {
100 return (GCMemoryManager*) new G1OldGenMemoryManager();
101 }
102
103 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) {
104 // Must do an acquire so as to force ordering of subsequent
105 // loads from anything _memory_mgr_obj points to or implies.
106 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
107 if (mgr_obj == NULL) {
108 // It's ok for more than one thread to execute the code up to the locked region.
109 // Extra manager instances will just be gc'ed.
110 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_0);
111 instanceKlassHandle ik(THREAD, k);
112
113 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
114
115 JavaValue result(T_OBJECT);
116 JavaCallArguments args;
117 args.push_oop(mgr_name); // Argument 1
118
119 Symbol* method_name = NULL;
120 Symbol* signature = NULL;
121 if (is_gc_memory_manager()) {
122 method_name = vmSymbols::createGarbageCollector_name();
123 signature = vmSymbols::createGarbageCollector_signature();
124 args.push_oop(Handle()); // Argument 2 (for future extension)
125 } else {
126 method_name = vmSymbols::createMemoryManager_name();
127 signature = vmSymbols::createMemoryManager_signature();
128 }
129
130 JavaCalls::call_static(&result,
131 ik,
132 method_name,
133 signature,
134 &args,
135 CHECK_0);
136
137 instanceOop m = (instanceOop) result.get_jobject();
138 instanceHandle mgr(THREAD, m);
139
140 {
141 // Get lock before setting _memory_mgr_obj
142 // since another thread may have created the instance
143 MutexLocker ml(Management_lock);
144
145 // Check if another thread has created the management object. We reload
146 // _memory_mgr_obj here because some other thread may have initialized
147 // it while we were executing the code before the lock.
148 //
149 // The lock has done an acquire, so the load can't float above it, but
150 // we need to do a load_acquire as above.
151 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
152 if (mgr_obj != NULL) {
153 return mgr_obj;
154 }
155
156 // Get the address of the object we created via call_special.
157 mgr_obj = mgr();
158
159 // Use store barrier to make sure the memory accesses associated
160 // with creating the management object are visible before publishing
161 // its address. The unlock will publish the store to _memory_mgr_obj
162 // because it does a release first.
163 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
164 }
165 }
166
167 return mgr_obj;
168 }
169
170 void MemoryManager::oops_do(OopClosure* f) {
171 f->do_oop((oop*) &_memory_mgr_obj);
172 }
173
174 GCStatInfo::GCStatInfo(int num_pools) {
175 // initialize the arrays for memory usage
176 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
177 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
178 _usage_array_size = num_pools;
179 clear();
180 }
181
182 GCStatInfo::~GCStatInfo() {
183 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array, mtInternal);
184 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array, mtInternal);
185 }
186
187 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
188 MemoryUsage* gc_usage_array;
189 if (before_gc) {
190 gc_usage_array = _before_gc_usage_array;
191 } else {
192 gc_usage_array = _after_gc_usage_array;
193 }
194 gc_usage_array[pool_index] = usage;
195 }
196
197 void GCStatInfo::clear() {
198 _index = 0;
199 _start_time = 0L;
200 _end_time = 0L;
201 size_t len = _usage_array_size * sizeof(MemoryUsage);
202 memset(_before_gc_usage_array, 0, len);
203 memset(_after_gc_usage_array, 0, len);
204 }
205
206
207 GCMemoryManager::GCMemoryManager() : MemoryManager() {
208 _num_collections = 0;
209 _last_gc_stat = NULL;
210 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true);
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::add_pool(MemoryPool* pool) {
223 add_pool(pool, true);
224 }
225
226 void GCMemoryManager::add_pool(MemoryPool* pool, bool always_affected_by_gc) {
227 int index = MemoryManager::add_pool(pool);
228 _pool_always_affected_by_gc[index] = always_affected_by_gc;
229 }
230
231 void GCMemoryManager::initialize_gc_stat_info() {
232 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
233 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
234 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
235 // tracking concurrent collections we need two objects: one to update, and one to
236 // hold the publicly available "last (completed) gc" information.
237 }
238
239 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
240 bool recordAccumulatedGCTime) {
241 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
242 if (recordAccumulatedGCTime) {
243 _accumulated_timer.start();
244 }
245 // _num_collections now increases in gc_end, to count completed collections
246 if (recordGCBeginTime) {
247 _current_gc_stat->set_index(_num_collections+1);
248 _current_gc_stat->set_start_time(Management::timestamp());
249 }
250
251 if (recordPreGCUsage) {
252 // Keep memory usage of all memory pools
253 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
254 MemoryPool* pool = MemoryService::get_memory_pool(i);
255 MemoryUsage usage = pool->get_memory_usage();
256 _current_gc_stat->set_before_gc_usage(i, usage);
257 #ifndef USDT2
258 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
259 name(), strlen(name()),
260 pool->name(), strlen(pool->name()),
261 usage.init_size(), usage.used(),
262 usage.committed(), usage.max_size());
263 #else /* USDT2 */
264 HOTSPOT_MEM_POOL_GC_BEGIN(
265 (char *) name(), strlen(name()),
266 (char *) pool->name(), strlen(pool->name()),
267 usage.init_size(), usage.used(),
268 usage.committed(), usage.max_size());
269 #endif /* USDT2 */
270 }
271 }
272 }
273
274 // A collector MUST, even if it does not complete for some reason,
275 // make a TraceMemoryManagerStats object where countCollection is true,
276 // to ensure the current gc stat is placed in _last_gc_stat.
277 void GCMemoryManager::gc_end(bool recordPostGCUsage,
278 bool recordAccumulatedGCTime,
279 bool recordGCEndTime, bool countCollection,
280 GCCause::Cause cause,
281 bool allMemoryPoolsAffected) {
282 if (recordAccumulatedGCTime) {
283 _accumulated_timer.stop();
284 }
285 if (recordGCEndTime) {
286 _current_gc_stat->set_end_time(Management::timestamp());
287 }
288
289 if (recordPostGCUsage) {
290 int i;
291 // keep the last gc statistics for all memory pools
292 for (i = 0; i < MemoryService::num_memory_pools(); i++) {
293 MemoryPool* pool = MemoryService::get_memory_pool(i);
294 MemoryUsage usage = pool->get_memory_usage();
295
296 #ifndef USDT2
297 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
298 name(), strlen(name()),
299 pool->name(), strlen(pool->name()),
300 usage.init_size(), usage.used(),
301 usage.committed(), usage.max_size());
302 #else /* USDT2 */
303 HOTSPOT_MEM_POOL_GC_END(
304 (char *) name(), strlen(name()),
305 (char *) pool->name(), strlen(pool->name()),
306 usage.init_size(), usage.used(),
307 usage.committed(), usage.max_size());
308 #endif /* USDT2 */
309
310 _current_gc_stat->set_after_gc_usage(i, usage);
311 }
312
313 // Set last collection usage of the memory pools managed by this collector
314 for (i = 0; i < num_memory_pools(); i++) {
315 MemoryPool* pool = get_memory_pool(i);
316 MemoryUsage usage = pool->get_memory_usage();
317
318 // Compare with GC usage threshold
319 if (allMemoryPoolsAffected || pool_always_affected_by_gc(i)) {
320 // Compare with GC usage threshold
321 pool->set_last_collection_usage(usage);
322 LowMemoryDetector::detect_after_gc_memory(pool);
323 }
324 }
325 }
326
327 if (countCollection) {
328 _num_collections++;
329 // alternately update two objects making one public when complete
330 {
331 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
332 GCStatInfo *tmp = _last_gc_stat;
333 _last_gc_stat = _current_gc_stat;
334 _current_gc_stat = tmp;
335 // reset the current stat for diagnosability purposes
336 _current_gc_stat->clear();
337 }
338
339 if (is_notification_enabled()) {
340 bool isMajorGC = this == MemoryService::get_major_gc_manager();
341 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC",
342 GCCause::to_string(cause));
343 }
344 }
345 }
346
347 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) {
348 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
349 if (_last_gc_stat->gc_index() != 0) {
350 dest->set_index(_last_gc_stat->gc_index());
351 dest->set_start_time(_last_gc_stat->start_time());
352 dest->set_end_time(_last_gc_stat->end_time());
353 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(),
354 "Must have same array size");
355 size_t len = dest->usage_array_size() * sizeof(MemoryUsage);
356 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len);
357 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len);
358 }
359 return _last_gc_stat->gc_index();
360 }