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comparison src/share/vm/services/memoryManager.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_memoryManager.cpp.incl"
27
28 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int,
29 size_t, size_t, size_t, size_t);
30 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int,
31 size_t, size_t, size_t, size_t);
32
33 MemoryManager::MemoryManager() {
34 _num_pools = 0;
35 _memory_mgr_obj = NULL;
36 }
37
38 void MemoryManager::add_pool(MemoryPool* pool) {
39 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max");
40 if (_num_pools < MemoryManager::max_num_pools) {
41 _pools[_num_pools] = pool;
42 _num_pools++;
43 }
44 pool->add_manager(this);
45 }
46
47 MemoryManager* MemoryManager::get_code_cache_memory_manager() {
48 return (MemoryManager*) new CodeCacheMemoryManager();
49 }
50
51 GCMemoryManager* MemoryManager::get_copy_memory_manager() {
52 return (GCMemoryManager*) new CopyMemoryManager();
53 }
54
55 GCMemoryManager* MemoryManager::get_msc_memory_manager() {
56 return (GCMemoryManager*) new MSCMemoryManager();
57 }
58
59 GCMemoryManager* MemoryManager::get_parnew_memory_manager() {
60 return (GCMemoryManager*) new ParNewMemoryManager();
61 }
62
63 GCMemoryManager* MemoryManager::get_cms_memory_manager() {
64 return (GCMemoryManager*) new CMSMemoryManager();
65 }
66
67 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() {
68 return (GCMemoryManager*) new PSScavengeMemoryManager();
69 }
70
71 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() {
72 return (GCMemoryManager*) new PSMarkSweepMemoryManager();
73 }
74
75 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) {
76 // Must do an acquire so as to force ordering of subsequent
77 // loads from anything _memory_mgr_obj points to or implies.
78 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
79 if (mgr_obj == NULL) {
80 // It's ok for more than one thread to execute the code up to the locked region.
81 // Extra manager instances will just be gc'ed.
82 klassOop k = Management::sun_management_ManagementFactory_klass(CHECK_0);
83 instanceKlassHandle ik(THREAD, k);
84
85 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
86
87 JavaValue result(T_OBJECT);
88 JavaCallArguments args;
89 args.push_oop(mgr_name); // Argument 1
90
91 symbolHandle method_name;
92 symbolHandle signature;
93 if (is_gc_memory_manager()) {
94 method_name = vmSymbolHandles::createGarbageCollector_name();
95 signature = vmSymbolHandles::createGarbageCollector_signature();
96 args.push_oop(Handle()); // Argument 2 (for future extension)
97 } else {
98 method_name = vmSymbolHandles::createMemoryManager_name();
99 signature = vmSymbolHandles::createMemoryManager_signature();
100 }
101
102 JavaCalls::call_static(&result,
103 ik,
104 method_name,
105 signature,
106 &args,
107 CHECK_0);
108
109 instanceOop m = (instanceOop) result.get_jobject();
110 instanceHandle mgr(THREAD, m);
111
112 {
113 // Get lock before setting _memory_mgr_obj
114 // since another thread may have created the instance
115 MutexLocker ml(Management_lock);
116
117 // Check if another thread has created the management object. We reload
118 // _memory_mgr_obj here because some other thread may have initialized
119 // it while we were executing the code before the lock.
120 //
121 // The lock has done an acquire, so the load can't float above it, but
122 // we need to do a load_acquire as above.
123 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
124 if (mgr_obj != NULL) {
125 return mgr_obj;
126 }
127
128 // Get the address of the object we created via call_special.
129 mgr_obj = mgr();
130
131 // Use store barrier to make sure the memory accesses associated
132 // with creating the management object are visible before publishing
133 // its address. The unlock will publish the store to _memory_mgr_obj
134 // because it does a release first.
135 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
136 }
137 }
138
139 return mgr_obj;
140 }
141
142 void MemoryManager::oops_do(OopClosure* f) {
143 f->do_oop((oop*) &_memory_mgr_obj);
144 }
145
146 GCStatInfo::GCStatInfo(int num_pools) {
147 // initialize the arrays for memory usage
148 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools);
149 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools);
150 size_t len = num_pools * sizeof(MemoryUsage);
151 memset(_before_gc_usage_array, 0, len);
152 memset(_after_gc_usage_array, 0, len);
153 _usage_array_size = num_pools;
154 }
155
156 GCStatInfo::~GCStatInfo() {
157 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array);
158 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array);
159 }
160
161 void GCStatInfo::copy_stat(GCStatInfo* stat) {
162 set_index(stat->gc_index());
163 set_start_time(stat->start_time());
164 set_end_time(stat->end_time());
165 assert(_usage_array_size == stat->usage_array_size(), "Must have same array size");
166 for (int i = 0; i < _usage_array_size; i++) {
167 set_before_gc_usage(i, stat->before_gc_usage_for_pool(i));
168 set_after_gc_usage(i, stat->after_gc_usage_for_pool(i));
169 }
170 }
171
172 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
173 MemoryUsage* gc_usage_array;
174 if (before_gc) {
175 gc_usage_array = _before_gc_usage_array;
176 } else {
177 gc_usage_array = _after_gc_usage_array;
178 }
179 gc_usage_array[pool_index] = usage;
180 }
181
182 GCMemoryManager::GCMemoryManager() : MemoryManager() {
183 _num_collections = 0;
184 _last_gc_stat = NULL;
185 _num_gc_threads = 1;
186 }
187
188 GCMemoryManager::~GCMemoryManager() {
189 delete _last_gc_stat;
190 }
191
192 void GCMemoryManager::initialize_gc_stat_info() {
193 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
194 _last_gc_stat = new GCStatInfo(MemoryService::num_memory_pools());
195 }
196
197 void GCMemoryManager::gc_begin() {
198 assert(_last_gc_stat != NULL, "Just checking");
199 _accumulated_timer.start();
200 _num_collections++;
201 _last_gc_stat->set_index(_num_collections);
202 _last_gc_stat->set_start_time(Management::timestamp());
203
204 // Keep memory usage of all memory pools
205 for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
206 MemoryPool* pool = MemoryService::get_memory_pool(i);
207 MemoryUsage usage = pool->get_memory_usage();
208 _last_gc_stat->set_before_gc_usage(i, usage);
209 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
210 name(), strlen(name()),
211 pool->name(), strlen(pool->name()),
212 usage.init_size(), usage.used(),
213 usage.committed(), usage.max_size());
214 }
215 }
216
217 void GCMemoryManager::gc_end() {
218 _accumulated_timer.stop();
219 _last_gc_stat->set_end_time(Management::timestamp());
220
221 int i;
222 // keep the last gc statistics for all memory pools
223 for (i = 0; i < MemoryService::num_memory_pools(); i++) {
224 MemoryPool* pool = MemoryService::get_memory_pool(i);
225 MemoryUsage usage = pool->get_memory_usage();
226
227 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
228 name(), strlen(name()),
229 pool->name(), strlen(pool->name()),
230 usage.init_size(), usage.used(),
231 usage.committed(), usage.max_size());
232
233 _last_gc_stat->set_after_gc_usage(i, usage);
234 }
235
236 // Set last collection usage of the memory pools managed by this collector
237 for (i = 0; i < num_memory_pools(); i++) {
238 MemoryPool* pool = get_memory_pool(i);
239 MemoryUsage usage = pool->get_memory_usage();
240
241 // Compare with GC usage threshold
242 pool->set_last_collection_usage(usage);
243 LowMemoryDetector::detect_after_gc_memory(pool);
244 }
245 }