Mercurial > hg > truffle
annotate src/share/vm/services/memoryManager.cpp @ 3741:c76c13577460
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author | never |
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date | Thu, 26 May 2011 16:39:34 -0700 |
parents | 78542e2b5e35 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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" | |
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36 #include "services/gcNotifier.hpp" |
1972 | 37 #include "utilities/dtrace.hpp" |
0 | 38 |
39 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int, | |
40 size_t, size_t, size_t, size_t); | |
41 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int, | |
42 size_t, size_t, size_t, size_t); | |
43 | |
44 MemoryManager::MemoryManager() { | |
45 _num_pools = 0; | |
46 _memory_mgr_obj = NULL; | |
47 } | |
48 | |
49 void MemoryManager::add_pool(MemoryPool* pool) { | |
50 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max"); | |
51 if (_num_pools < MemoryManager::max_num_pools) { | |
52 _pools[_num_pools] = pool; | |
53 _num_pools++; | |
54 } | |
55 pool->add_manager(this); | |
56 } | |
57 | |
58 MemoryManager* MemoryManager::get_code_cache_memory_manager() { | |
59 return (MemoryManager*) new CodeCacheMemoryManager(); | |
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 | |
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86 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() { |
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87 return (GCMemoryManager*) new G1YoungGenMemoryManager(); |
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88 } |
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89 |
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90 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() { |
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91 return (GCMemoryManager*) new G1OldGenMemoryManager(); |
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92 } |
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93 |
0 | 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 klassOop 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 | |
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110 Symbol* method_name = NULL; |
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111 Symbol* signature = NULL; |
0 | 112 if (is_gc_memory_manager()) { |
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113 method_name = vmSymbols::createGarbageCollector_name(); |
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114 signature = vmSymbols::createGarbageCollector_signature(); |
0 | 115 args.push_oop(Handle()); // Argument 2 (for future extension) |
116 } else { | |
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117 method_name = vmSymbols::createMemoryManager_name(); |
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118 signature = vmSymbols::createMemoryManager_signature(); |
0 | 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); | |
168 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); | |
169 size_t len = num_pools * sizeof(MemoryUsage); | |
170 memset(_before_gc_usage_array, 0, len); | |
171 memset(_after_gc_usage_array, 0, len); | |
172 _usage_array_size = num_pools; | |
173 } | |
174 | |
175 GCStatInfo::~GCStatInfo() { | |
176 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array); | |
177 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array); | |
178 } | |
179 | |
180 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { | |
181 MemoryUsage* gc_usage_array; | |
182 if (before_gc) { | |
183 gc_usage_array = _before_gc_usage_array; | |
184 } else { | |
185 gc_usage_array = _after_gc_usage_array; | |
186 } | |
187 gc_usage_array[pool_index] = usage; | |
188 } | |
189 | |
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190 void GCStatInfo::clear() { |
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191 _index = 0; |
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192 _start_time = 0L; |
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193 _end_time = 0L; |
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194 size_t len = _usage_array_size * sizeof(MemoryUsage); |
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195 memset(_before_gc_usage_array, 0, len); |
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196 memset(_after_gc_usage_array, 0, len); |
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197 } |
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198 |
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199 |
0 | 200 GCMemoryManager::GCMemoryManager() : MemoryManager() { |
201 _num_collections = 0; | |
202 _last_gc_stat = NULL; | |
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203 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true); |
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204 _current_gc_stat = NULL; |
0 | 205 _num_gc_threads = 1; |
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206 _notification_enabled = false; |
0 | 207 } |
208 | |
209 GCMemoryManager::~GCMemoryManager() { | |
210 delete _last_gc_stat; | |
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211 delete _last_gc_lock; |
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212 delete _current_gc_stat; |
0 | 213 } |
214 | |
215 void GCMemoryManager::initialize_gc_stat_info() { | |
216 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); | |
217 _last_gc_stat = new GCStatInfo(MemoryService::num_memory_pools()); | |
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218 _current_gc_stat = new GCStatInfo(MemoryService::num_memory_pools()); |
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219 // tracking concurrent collections we need two objects: one to update, and one to |
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220 // hold the publicly available "last (completed) gc" information. |
0 | 221 } |
222 | |
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223 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, |
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224 bool recordAccumulatedGCTime) { |
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225 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking"); |
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226 if (recordAccumulatedGCTime) { |
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227 _accumulated_timer.start(); |
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228 } |
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229 // _num_collections now increases in gc_end, to count completed collections |
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230 if (recordGCBeginTime) { |
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231 _current_gc_stat->set_index(_num_collections+1); |
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232 _current_gc_stat->set_start_time(Management::timestamp()); |
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233 } |
0 | 234 |
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235 if (recordPreGCUsage) { |
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236 // Keep memory usage of all memory pools |
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237 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { |
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238 MemoryPool* pool = MemoryService::get_memory_pool(i); |
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239 MemoryUsage usage = pool->get_memory_usage(); |
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240 _current_gc_stat->set_before_gc_usage(i, usage); |
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241 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin, |
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242 name(), strlen(name()), |
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243 pool->name(), strlen(pool->name()), |
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244 usage.init_size(), usage.used(), |
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245 usage.committed(), usage.max_size()); |
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246 } |
0 | 247 } |
248 } | |
249 | |
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250 // A collector MUST, even if it does not complete for some reason, |
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251 // make a TraceMemoryManagerStats object where countCollection is true, |
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252 // to ensure the current gc stat is placed in _last_gc_stat. |
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253 void GCMemoryManager::gc_end(bool recordPostGCUsage, |
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254 bool recordAccumulatedGCTime, |
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255 bool recordGCEndTime, bool countCollection, |
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256 GCCause::Cause cause) { |
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257 if (recordAccumulatedGCTime) { |
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258 _accumulated_timer.stop(); |
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259 } |
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260 if (recordGCEndTime) { |
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261 _current_gc_stat->set_end_time(Management::timestamp()); |
0 | 262 } |
263 | |
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264 if (recordPostGCUsage) { |
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265 int i; |
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266 // keep the last gc statistics for all memory pools |
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267 for (i = 0; i < MemoryService::num_memory_pools(); i++) { |
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268 MemoryPool* pool = MemoryService::get_memory_pool(i); |
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269 MemoryUsage usage = pool->get_memory_usage(); |
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270 |
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271 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end, |
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272 name(), strlen(name()), |
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273 pool->name(), strlen(pool->name()), |
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274 usage.init_size(), usage.used(), |
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275 usage.committed(), usage.max_size()); |
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276 |
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277 _current_gc_stat->set_after_gc_usage(i, usage); |
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278 } |
0 | 279 |
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280 // Set last collection usage of the memory pools managed by this collector |
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281 for (i = 0; i < num_memory_pools(); i++) { |
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282 MemoryPool* pool = get_memory_pool(i); |
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283 MemoryUsage usage = pool->get_memory_usage(); |
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284 |
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285 // Compare with GC usage threshold |
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286 pool->set_last_collection_usage(usage); |
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287 LowMemoryDetector::detect_after_gc_memory(pool); |
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288 } |
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289 if(is_notification_enabled()) { |
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290 bool isMajorGC = this == MemoryService::get_major_gc_manager(); |
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291 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC", |
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292 GCCause::to_string(cause)); |
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293 } |
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294 } |
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295 if (countCollection) { |
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296 _num_collections++; |
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297 // alternately update two objects making one public when complete |
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298 { |
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299 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); |
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300 GCStatInfo *tmp = _last_gc_stat; |
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301 _last_gc_stat = _current_gc_stat; |
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302 _current_gc_stat = tmp; |
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303 // reset the current stat for diagnosability purposes |
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304 _current_gc_stat->clear(); |
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305 } |
0 | 306 } |
307 } | |
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308 |
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309 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) { |
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310 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); |
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311 if (_last_gc_stat->gc_index() != 0) { |
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312 dest->set_index(_last_gc_stat->gc_index()); |
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313 dest->set_start_time(_last_gc_stat->start_time()); |
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314 dest->set_end_time(_last_gc_stat->end_time()); |
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315 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(), |
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316 "Must have same array size"); |
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317 size_t len = dest->usage_array_size() * sizeof(MemoryUsage); |
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318 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len); |
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319 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len); |
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320 } |
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321 return _last_gc_stat->gc_index(); |
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322 } |