Thu, 05 Jun 2008 15:57:56 -0700
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_memoryManager.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int, |
duke@435 | 29 | size_t, size_t, size_t, size_t); |
duke@435 | 30 | HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int, |
duke@435 | 31 | size_t, size_t, size_t, size_t); |
duke@435 | 32 | |
duke@435 | 33 | MemoryManager::MemoryManager() { |
duke@435 | 34 | _num_pools = 0; |
duke@435 | 35 | _memory_mgr_obj = NULL; |
duke@435 | 36 | } |
duke@435 | 37 | |
duke@435 | 38 | void MemoryManager::add_pool(MemoryPool* pool) { |
duke@435 | 39 | assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max"); |
duke@435 | 40 | if (_num_pools < MemoryManager::max_num_pools) { |
duke@435 | 41 | _pools[_num_pools] = pool; |
duke@435 | 42 | _num_pools++; |
duke@435 | 43 | } |
duke@435 | 44 | pool->add_manager(this); |
duke@435 | 45 | } |
duke@435 | 46 | |
duke@435 | 47 | MemoryManager* MemoryManager::get_code_cache_memory_manager() { |
duke@435 | 48 | return (MemoryManager*) new CodeCacheMemoryManager(); |
duke@435 | 49 | } |
duke@435 | 50 | |
duke@435 | 51 | GCMemoryManager* MemoryManager::get_copy_memory_manager() { |
duke@435 | 52 | return (GCMemoryManager*) new CopyMemoryManager(); |
duke@435 | 53 | } |
duke@435 | 54 | |
duke@435 | 55 | GCMemoryManager* MemoryManager::get_msc_memory_manager() { |
duke@435 | 56 | return (GCMemoryManager*) new MSCMemoryManager(); |
duke@435 | 57 | } |
duke@435 | 58 | |
duke@435 | 59 | GCMemoryManager* MemoryManager::get_parnew_memory_manager() { |
duke@435 | 60 | return (GCMemoryManager*) new ParNewMemoryManager(); |
duke@435 | 61 | } |
duke@435 | 62 | |
duke@435 | 63 | GCMemoryManager* MemoryManager::get_cms_memory_manager() { |
duke@435 | 64 | return (GCMemoryManager*) new CMSMemoryManager(); |
duke@435 | 65 | } |
duke@435 | 66 | |
duke@435 | 67 | GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() { |
duke@435 | 68 | return (GCMemoryManager*) new PSScavengeMemoryManager(); |
duke@435 | 69 | } |
duke@435 | 70 | |
duke@435 | 71 | GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() { |
duke@435 | 72 | return (GCMemoryManager*) new PSMarkSweepMemoryManager(); |
duke@435 | 73 | } |
duke@435 | 74 | |
duke@435 | 75 | instanceOop MemoryManager::get_memory_manager_instance(TRAPS) { |
duke@435 | 76 | // Must do an acquire so as to force ordering of subsequent |
duke@435 | 77 | // loads from anything _memory_mgr_obj points to or implies. |
duke@435 | 78 | instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); |
duke@435 | 79 | if (mgr_obj == NULL) { |
duke@435 | 80 | // It's ok for more than one thread to execute the code up to the locked region. |
duke@435 | 81 | // Extra manager instances will just be gc'ed. |
duke@435 | 82 | klassOop k = Management::sun_management_ManagementFactory_klass(CHECK_0); |
duke@435 | 83 | instanceKlassHandle ik(THREAD, k); |
duke@435 | 84 | |
duke@435 | 85 | Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0); |
duke@435 | 86 | |
duke@435 | 87 | JavaValue result(T_OBJECT); |
duke@435 | 88 | JavaCallArguments args; |
duke@435 | 89 | args.push_oop(mgr_name); // Argument 1 |
duke@435 | 90 | |
duke@435 | 91 | symbolHandle method_name; |
duke@435 | 92 | symbolHandle signature; |
duke@435 | 93 | if (is_gc_memory_manager()) { |
duke@435 | 94 | method_name = vmSymbolHandles::createGarbageCollector_name(); |
duke@435 | 95 | signature = vmSymbolHandles::createGarbageCollector_signature(); |
duke@435 | 96 | args.push_oop(Handle()); // Argument 2 (for future extension) |
duke@435 | 97 | } else { |
duke@435 | 98 | method_name = vmSymbolHandles::createMemoryManager_name(); |
duke@435 | 99 | signature = vmSymbolHandles::createMemoryManager_signature(); |
duke@435 | 100 | } |
duke@435 | 101 | |
duke@435 | 102 | JavaCalls::call_static(&result, |
duke@435 | 103 | ik, |
duke@435 | 104 | method_name, |
duke@435 | 105 | signature, |
duke@435 | 106 | &args, |
duke@435 | 107 | CHECK_0); |
duke@435 | 108 | |
duke@435 | 109 | instanceOop m = (instanceOop) result.get_jobject(); |
duke@435 | 110 | instanceHandle mgr(THREAD, m); |
duke@435 | 111 | |
duke@435 | 112 | { |
duke@435 | 113 | // Get lock before setting _memory_mgr_obj |
duke@435 | 114 | // since another thread may have created the instance |
duke@435 | 115 | MutexLocker ml(Management_lock); |
duke@435 | 116 | |
duke@435 | 117 | // Check if another thread has created the management object. We reload |
duke@435 | 118 | // _memory_mgr_obj here because some other thread may have initialized |
duke@435 | 119 | // it while we were executing the code before the lock. |
duke@435 | 120 | // |
duke@435 | 121 | // The lock has done an acquire, so the load can't float above it, but |
duke@435 | 122 | // we need to do a load_acquire as above. |
duke@435 | 123 | mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); |
duke@435 | 124 | if (mgr_obj != NULL) { |
duke@435 | 125 | return mgr_obj; |
duke@435 | 126 | } |
duke@435 | 127 | |
duke@435 | 128 | // Get the address of the object we created via call_special. |
duke@435 | 129 | mgr_obj = mgr(); |
duke@435 | 130 | |
duke@435 | 131 | // Use store barrier to make sure the memory accesses associated |
duke@435 | 132 | // with creating the management object are visible before publishing |
duke@435 | 133 | // its address. The unlock will publish the store to _memory_mgr_obj |
duke@435 | 134 | // because it does a release first. |
duke@435 | 135 | OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj); |
duke@435 | 136 | } |
duke@435 | 137 | } |
duke@435 | 138 | |
duke@435 | 139 | return mgr_obj; |
duke@435 | 140 | } |
duke@435 | 141 | |
duke@435 | 142 | void MemoryManager::oops_do(OopClosure* f) { |
duke@435 | 143 | f->do_oop((oop*) &_memory_mgr_obj); |
duke@435 | 144 | } |
duke@435 | 145 | |
duke@435 | 146 | GCStatInfo::GCStatInfo(int num_pools) { |
duke@435 | 147 | // initialize the arrays for memory usage |
duke@435 | 148 | _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); |
duke@435 | 149 | _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); |
duke@435 | 150 | size_t len = num_pools * sizeof(MemoryUsage); |
duke@435 | 151 | memset(_before_gc_usage_array, 0, len); |
duke@435 | 152 | memset(_after_gc_usage_array, 0, len); |
duke@435 | 153 | _usage_array_size = num_pools; |
duke@435 | 154 | } |
duke@435 | 155 | |
duke@435 | 156 | GCStatInfo::~GCStatInfo() { |
duke@435 | 157 | FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array); |
duke@435 | 158 | FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array); |
duke@435 | 159 | } |
duke@435 | 160 | |
duke@435 | 161 | void GCStatInfo::copy_stat(GCStatInfo* stat) { |
duke@435 | 162 | set_index(stat->gc_index()); |
duke@435 | 163 | set_start_time(stat->start_time()); |
duke@435 | 164 | set_end_time(stat->end_time()); |
duke@435 | 165 | assert(_usage_array_size == stat->usage_array_size(), "Must have same array size"); |
duke@435 | 166 | for (int i = 0; i < _usage_array_size; i++) { |
duke@435 | 167 | set_before_gc_usage(i, stat->before_gc_usage_for_pool(i)); |
duke@435 | 168 | set_after_gc_usage(i, stat->after_gc_usage_for_pool(i)); |
duke@435 | 169 | } |
duke@435 | 170 | } |
duke@435 | 171 | |
duke@435 | 172 | void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { |
duke@435 | 173 | MemoryUsage* gc_usage_array; |
duke@435 | 174 | if (before_gc) { |
duke@435 | 175 | gc_usage_array = _before_gc_usage_array; |
duke@435 | 176 | } else { |
duke@435 | 177 | gc_usage_array = _after_gc_usage_array; |
duke@435 | 178 | } |
duke@435 | 179 | gc_usage_array[pool_index] = usage; |
duke@435 | 180 | } |
duke@435 | 181 | |
duke@435 | 182 | GCMemoryManager::GCMemoryManager() : MemoryManager() { |
duke@435 | 183 | _num_collections = 0; |
duke@435 | 184 | _last_gc_stat = NULL; |
duke@435 | 185 | _num_gc_threads = 1; |
duke@435 | 186 | } |
duke@435 | 187 | |
duke@435 | 188 | GCMemoryManager::~GCMemoryManager() { |
duke@435 | 189 | delete _last_gc_stat; |
duke@435 | 190 | } |
duke@435 | 191 | |
duke@435 | 192 | void GCMemoryManager::initialize_gc_stat_info() { |
duke@435 | 193 | assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); |
duke@435 | 194 | _last_gc_stat = new GCStatInfo(MemoryService::num_memory_pools()); |
duke@435 | 195 | } |
duke@435 | 196 | |
duke@435 | 197 | void GCMemoryManager::gc_begin() { |
duke@435 | 198 | assert(_last_gc_stat != NULL, "Just checking"); |
duke@435 | 199 | _accumulated_timer.start(); |
duke@435 | 200 | _num_collections++; |
duke@435 | 201 | _last_gc_stat->set_index(_num_collections); |
duke@435 | 202 | _last_gc_stat->set_start_time(Management::timestamp()); |
duke@435 | 203 | |
duke@435 | 204 | // Keep memory usage of all memory pools |
duke@435 | 205 | for (int i = 0; i < MemoryService::num_memory_pools(); i++) { |
duke@435 | 206 | MemoryPool* pool = MemoryService::get_memory_pool(i); |
duke@435 | 207 | MemoryUsage usage = pool->get_memory_usage(); |
duke@435 | 208 | _last_gc_stat->set_before_gc_usage(i, usage); |
duke@435 | 209 | HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin, |
duke@435 | 210 | name(), strlen(name()), |
duke@435 | 211 | pool->name(), strlen(pool->name()), |
duke@435 | 212 | usage.init_size(), usage.used(), |
duke@435 | 213 | usage.committed(), usage.max_size()); |
duke@435 | 214 | } |
duke@435 | 215 | } |
duke@435 | 216 | |
duke@435 | 217 | void GCMemoryManager::gc_end() { |
duke@435 | 218 | _accumulated_timer.stop(); |
duke@435 | 219 | _last_gc_stat->set_end_time(Management::timestamp()); |
duke@435 | 220 | |
duke@435 | 221 | int i; |
duke@435 | 222 | // keep the last gc statistics for all memory pools |
duke@435 | 223 | for (i = 0; i < MemoryService::num_memory_pools(); i++) { |
duke@435 | 224 | MemoryPool* pool = MemoryService::get_memory_pool(i); |
duke@435 | 225 | MemoryUsage usage = pool->get_memory_usage(); |
duke@435 | 226 | |
duke@435 | 227 | HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end, |
duke@435 | 228 | name(), strlen(name()), |
duke@435 | 229 | pool->name(), strlen(pool->name()), |
duke@435 | 230 | usage.init_size(), usage.used(), |
duke@435 | 231 | usage.committed(), usage.max_size()); |
duke@435 | 232 | |
duke@435 | 233 | _last_gc_stat->set_after_gc_usage(i, usage); |
duke@435 | 234 | } |
duke@435 | 235 | |
duke@435 | 236 | // Set last collection usage of the memory pools managed by this collector |
duke@435 | 237 | for (i = 0; i < num_memory_pools(); i++) { |
duke@435 | 238 | MemoryPool* pool = get_memory_pool(i); |
duke@435 | 239 | MemoryUsage usage = pool->get_memory_usage(); |
duke@435 | 240 | |
duke@435 | 241 | // Compare with GC usage threshold |
duke@435 | 242 | pool->set_last_collection_usage(usage); |
duke@435 | 243 | LowMemoryDetector::detect_after_gc_memory(pool); |
duke@435 | 244 | } |
duke@435 | 245 | } |