author | shade |
Mon, 11 Jun 2018 09:29:44 +0200 | |
branch | epsilon-gc-branch |
changeset 56719 | a846e7bbcdfa |
parent 56348 | f3b0961adb3c |
parent 50429 | 83aec1d357d4 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/javaCalls.hpp" |
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#include "runtime/orderAccess.hpp" |
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#include "services/lowMemoryDetector.hpp" |
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#include "services/management.hpp" |
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#include "services/memoryManager.hpp" |
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#include "services/memoryPool.hpp" |
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#include "services/memoryService.hpp" |
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#include "services/gcNotifier.hpp" |
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#include "utilities/dtrace.hpp" |
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MemoryManager::MemoryManager(const char* name) : _name(name) { |
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_num_pools = 0; |
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(void)const_cast<instanceOop&>(_memory_mgr_obj = instanceOop(NULL)); |
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} |
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void MemoryManager::add_pool(MemoryPool* pool) { |
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assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max"); |
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if (_num_pools < MemoryManager::max_num_pools) { |
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_pools[_num_pools] = pool; |
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_num_pools++; |
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} |
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pool->add_manager(this); |
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} |
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MemoryManager* MemoryManager::get_code_cache_memory_manager() { |
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return new MemoryManager("CodeCacheManager"); |
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} |
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MemoryManager* MemoryManager::get_metaspace_memory_manager() { |
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return new MemoryManager("Metaspace Manager"); |
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} |
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instanceOop MemoryManager::get_memory_manager_instance(TRAPS) { |
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// Must do an acquire so as to force ordering of subsequent |
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// loads from anything _memory_mgr_obj points to or implies. |
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instanceOop mgr_obj = OrderAccess::load_acquire(&_memory_mgr_obj); |
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if (mgr_obj == NULL) { |
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// It's ok for more than one thread to execute the code up to the locked region. |
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// Extra manager instances will just be gc'ed. |
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Klass* k = Management::sun_management_ManagementFactoryHelper_klass(CHECK_0); |
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Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0); |
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JavaValue result(T_OBJECT); |
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JavaCallArguments args; |
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args.push_oop(mgr_name); // Argument 1 |
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Symbol* method_name = NULL; |
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Symbol* signature = NULL; |
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if (is_gc_memory_manager()) { |
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Klass* extKlass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK_0); |
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// com.sun.management.GarbageCollectorMXBean is in jdk.management module which may not be present. |
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if (extKlass != NULL) { |
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k = extKlass; |
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} |
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method_name = vmSymbols::createGarbageCollector_name(); |
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signature = vmSymbols::createGarbageCollector_signature(); |
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args.push_oop(Handle()); // Argument 2 (for future extension) |
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} else { |
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method_name = vmSymbols::createMemoryManager_name(); |
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signature = vmSymbols::createMemoryManager_signature(); |
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} |
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InstanceKlass* ik = InstanceKlass::cast(k); |
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JavaCalls::call_static(&result, |
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ik, |
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method_name, |
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signature, |
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&args, |
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CHECK_0); |
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instanceOop m = (instanceOop) result.get_jobject(); |
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instanceHandle mgr(THREAD, m); |
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{ |
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// Get lock before setting _memory_mgr_obj |
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// since another thread may have created the instance |
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MutexLocker ml(Management_lock); |
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// Check if another thread has created the management object. We reload |
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// _memory_mgr_obj here because some other thread may have initialized |
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// it while we were executing the code before the lock. |
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// |
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// The lock has done an acquire, so the load can't float above it, but |
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// we need to do a load_acquire as above. |
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mgr_obj = OrderAccess::load_acquire(&_memory_mgr_obj); |
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if (mgr_obj != NULL) { |
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return mgr_obj; |
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} |
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// Get the address of the object we created via call_special. |
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mgr_obj = mgr(); |
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// Use store barrier to make sure the memory accesses associated |
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// with creating the management object are visible before publishing |
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// its address. The unlock will publish the store to _memory_mgr_obj |
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// because it does a release first. |
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OrderAccess::release_store(&_memory_mgr_obj, mgr_obj); |
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} |
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} |
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return mgr_obj; |
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} |
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void MemoryManager::oops_do(OopClosure* f) { |
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f->do_oop((oop*) &_memory_mgr_obj); |
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} |
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GCStatInfo::GCStatInfo(int num_pools) { |
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// initialize the arrays for memory usage |
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_before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); |
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_after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); |
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_usage_array_size = num_pools; |
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clear(); |
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} |
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GCStatInfo::~GCStatInfo() { |
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FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array); |
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FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array); |
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} |
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void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { |
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MemoryUsage* gc_usage_array; |
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if (before_gc) { |
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gc_usage_array = _before_gc_usage_array; |
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} else { |
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gc_usage_array = _after_gc_usage_array; |
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} |
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gc_usage_array[pool_index] = usage; |
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} |
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void GCStatInfo::clear() { |
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_index = 0; |
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_start_time = 0L; |
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_end_time = 0L; |
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size_t len = _usage_array_size * sizeof(MemoryUsage); |
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memset(_before_gc_usage_array, 0, len); |
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memset(_after_gc_usage_array, 0, len); |
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} |
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GCMemoryManager::GCMemoryManager(const char* name, const char* gc_end_message) : |
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MemoryManager(name), _gc_end_message(gc_end_message) { |
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_num_collections = 0; |
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_last_gc_stat = NULL; |
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_last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true, |
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Monitor::_safepoint_check_never); |
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_current_gc_stat = NULL; |
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_num_gc_threads = 1; |
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_notification_enabled = false; |
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} |
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186 |
GCMemoryManager::~GCMemoryManager() { |
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delete _last_gc_stat; |
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delete _last_gc_lock; |
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delete _current_gc_stat; |
1 | 190 |
} |
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192 |
void GCMemoryManager::initialize_gc_stat_info() { |
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193 |
assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); |
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_last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); |
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_current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); |
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// tracking concurrent collections we need two objects: one to update, and one to |
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// hold the publicly available "last (completed) gc" information. |
1 | 198 |
} |
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void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, |
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bool recordAccumulatedGCTime) { |
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assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking"); |
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if (recordAccumulatedGCTime) { |
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_accumulated_timer.start(); |
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} |
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// _num_collections now increases in gc_end, to count completed collections |
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if (recordGCBeginTime) { |
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_current_gc_stat->set_index(_num_collections+1); |
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_current_gc_stat->set_start_time(Management::timestamp()); |
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} |
1 | 211 |
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if (recordPreGCUsage) { |
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// Keep memory usage of all memory pools |
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for (int i = 0; i < MemoryService::num_memory_pools(); i++) { |
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MemoryPool* pool = MemoryService::get_memory_pool(i); |
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MemoryUsage usage = pool->get_memory_usage(); |
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217 |
_current_gc_stat->set_before_gc_usage(i, usage); |
10739 | 218 |
HOTSPOT_MEM_POOL_GC_BEGIN( |
219 |
(char *) name(), strlen(name()), |
|
220 |
(char *) pool->name(), strlen(pool->name()), |
|
221 |
usage.init_size(), usage.used(), |
|
222 |
usage.committed(), usage.max_size()); |
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} |
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} |
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} |
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// A collector MUST, even if it does not complete for some reason, |
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// make a TraceMemoryManagerStats object where countCollection is true, |
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// to ensure the current gc stat is placed in _last_gc_stat. |
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void GCMemoryManager::gc_end(bool recordPostGCUsage, |
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bool recordAccumulatedGCTime, |
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bool recordGCEndTime, bool countCollection, |
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GCCause::Cause cause) { |
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if (recordAccumulatedGCTime) { |
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_accumulated_timer.stop(); |
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} |
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if (recordGCEndTime) { |
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_current_gc_stat->set_end_time(Management::timestamp()); |
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} |
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if (recordPostGCUsage) { |
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int i; |
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// keep the last gc statistics for all memory pools |
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for (i = 0; i < MemoryService::num_memory_pools(); i++) { |
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MemoryPool* pool = MemoryService::get_memory_pool(i); |
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MemoryUsage usage = pool->get_memory_usage(); |
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|
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HOTSPOT_MEM_POOL_GC_END( |
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(char *) name(), strlen(name()), |
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(char *) pool->name(), strlen(pool->name()), |
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usage.init_size(), usage.used(), |
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usage.committed(), usage.max_size()); |
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|
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_current_gc_stat->set_after_gc_usage(i, usage); |
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} |
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// Set last collection usage of the memory pools managed by this collector |
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for (i = 0; i < num_memory_pools(); i++) { |
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MemoryPool* pool = get_memory_pool(i); |
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MemoryUsage usage = pool->get_memory_usage(); |
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|
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// Compare with GC usage threshold |
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pool->set_last_collection_usage(usage); |
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LowMemoryDetector::detect_after_gc_memory(pool); |
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} |
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} |
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if (countCollection) { |
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_num_collections++; |
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// alternately update two objects making one public when complete |
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{ |
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MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); |
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GCStatInfo *tmp = _last_gc_stat; |
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_last_gc_stat = _current_gc_stat; |
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_current_gc_stat = tmp; |
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// reset the current stat for diagnosability purposes |
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_current_gc_stat->clear(); |
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} |
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|
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if (is_notification_enabled()) { |
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GCNotifier::pushNotification(this, _gc_end_message, GCCause::to_string(cause)); |
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} |
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} |
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} |
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|
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size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) { |
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MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); |
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if (_last_gc_stat->gc_index() != 0) { |
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dest->set_index(_last_gc_stat->gc_index()); |
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dest->set_start_time(_last_gc_stat->start_time()); |
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dest->set_end_time(_last_gc_stat->end_time()); |
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assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(), |
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"Must have same array size"); |
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size_t len = dest->usage_array_size() * sizeof(MemoryUsage); |
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memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len); |
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memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len); |
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} |
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return _last_gc_stat->gc_index(); |
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} |