--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/services/memoryManager.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,331 @@
+/*
+ * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/vmSymbols.hpp"
+#include "oops/oop.inline.hpp"
+#include "runtime/handles.inline.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/orderAccess.inline.hpp"
+#include "services/lowMemoryDetector.hpp"
+#include "services/management.hpp"
+#include "services/memoryManager.hpp"
+#include "services/memoryPool.hpp"
+#include "services/memoryService.hpp"
+#include "services/gcNotifier.hpp"
+#include "utilities/dtrace.hpp"
+
+MemoryManager::MemoryManager() {
+ _num_pools = 0;
+ (void)const_cast<instanceOop&>(_memory_mgr_obj = instanceOop(NULL));
+}
+
+void MemoryManager::add_pool(MemoryPool* pool) {
+ assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max");
+ if (_num_pools < MemoryManager::max_num_pools) {
+ _pools[_num_pools] = pool;
+ _num_pools++;
+ }
+ pool->add_manager(this);
+}
+
+MemoryManager* MemoryManager::get_code_cache_memory_manager() {
+ return (MemoryManager*) new CodeCacheMemoryManager();
+}
+
+MemoryManager* MemoryManager::get_metaspace_memory_manager() {
+ return (MemoryManager*) new MetaspaceMemoryManager();
+}
+
+GCMemoryManager* MemoryManager::get_copy_memory_manager() {
+ return (GCMemoryManager*) new CopyMemoryManager();
+}
+
+GCMemoryManager* MemoryManager::get_msc_memory_manager() {
+ return (GCMemoryManager*) new MSCMemoryManager();
+}
+
+GCMemoryManager* MemoryManager::get_parnew_memory_manager() {
+ return (GCMemoryManager*) new ParNewMemoryManager();
+}
+
+GCMemoryManager* MemoryManager::get_cms_memory_manager() {
+ return (GCMemoryManager*) new CMSMemoryManager();
+}
+
+GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() {
+ return (GCMemoryManager*) new PSScavengeMemoryManager();
+}
+
+GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() {
+ return (GCMemoryManager*) new PSMarkSweepMemoryManager();
+}
+
+GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() {
+ return (GCMemoryManager*) new G1YoungGenMemoryManager();
+}
+
+GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() {
+ return (GCMemoryManager*) new G1OldGenMemoryManager();
+}
+
+instanceOop MemoryManager::get_memory_manager_instance(TRAPS) {
+ // Must do an acquire so as to force ordering of subsequent
+ // loads from anything _memory_mgr_obj points to or implies.
+ instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
+ if (mgr_obj == NULL) {
+ // It's ok for more than one thread to execute the code up to the locked region.
+ // Extra manager instances will just be gc'ed.
+ Klass* k = Management::sun_management_ManagementFactoryHelper_klass(CHECK_0);
+
+ Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0);
+
+ JavaValue result(T_OBJECT);
+ JavaCallArguments args;
+ args.push_oop(mgr_name); // Argument 1
+
+ Symbol* method_name = NULL;
+ Symbol* signature = NULL;
+ if (is_gc_memory_manager()) {
+ Klass* extKlass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK_0);
+ // com.sun.management.GarbageCollectorMXBean is in jdk.management module which may not be present.
+ if (extKlass != NULL) {
+ k = extKlass;
+ }
+
+ method_name = vmSymbols::createGarbageCollector_name();
+
+ signature = vmSymbols::createGarbageCollector_signature();
+ args.push_oop(Handle()); // Argument 2 (for future extension)
+ } else {
+ method_name = vmSymbols::createMemoryManager_name();
+ signature = vmSymbols::createMemoryManager_signature();
+ }
+
+ InstanceKlass* ik = InstanceKlass::cast(k);
+
+ JavaCalls::call_static(&result,
+ ik,
+ method_name,
+ signature,
+ &args,
+ CHECK_0);
+
+ instanceOop m = (instanceOop) result.get_jobject();
+ instanceHandle mgr(THREAD, m);
+
+ {
+ // Get lock before setting _memory_mgr_obj
+ // since another thread may have created the instance
+ MutexLocker ml(Management_lock);
+
+ // Check if another thread has created the management object. We reload
+ // _memory_mgr_obj here because some other thread may have initialized
+ // it while we were executing the code before the lock.
+ //
+ // The lock has done an acquire, so the load can't float above it, but
+ // we need to do a load_acquire as above.
+ mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj);
+ if (mgr_obj != NULL) {
+ return mgr_obj;
+ }
+
+ // Get the address of the object we created via call_special.
+ mgr_obj = mgr();
+
+ // Use store barrier to make sure the memory accesses associated
+ // with creating the management object are visible before publishing
+ // its address. The unlock will publish the store to _memory_mgr_obj
+ // because it does a release first.
+ OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj);
+ }
+ }
+
+ return mgr_obj;
+}
+
+void MemoryManager::oops_do(OopClosure* f) {
+ f->do_oop((oop*) &_memory_mgr_obj);
+}
+
+GCStatInfo::GCStatInfo(int num_pools) {
+ // initialize the arrays for memory usage
+ _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
+ _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal);
+ _usage_array_size = num_pools;
+ clear();
+}
+
+GCStatInfo::~GCStatInfo() {
+ FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array);
+ FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array);
+}
+
+void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) {
+ MemoryUsage* gc_usage_array;
+ if (before_gc) {
+ gc_usage_array = _before_gc_usage_array;
+ } else {
+ gc_usage_array = _after_gc_usage_array;
+ }
+ gc_usage_array[pool_index] = usage;
+}
+
+void GCStatInfo::clear() {
+ _index = 0;
+ _start_time = 0L;
+ _end_time = 0L;
+ size_t len = _usage_array_size * sizeof(MemoryUsage);
+ memset(_before_gc_usage_array, 0, len);
+ memset(_after_gc_usage_array, 0, len);
+}
+
+
+GCMemoryManager::GCMemoryManager() : MemoryManager() {
+ _num_collections = 0;
+ _last_gc_stat = NULL;
+ _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true,
+ Monitor::_safepoint_check_never);
+ _current_gc_stat = NULL;
+ _num_gc_threads = 1;
+ _notification_enabled = false;
+}
+
+GCMemoryManager::~GCMemoryManager() {
+ delete _last_gc_stat;
+ delete _last_gc_lock;
+ delete _current_gc_stat;
+}
+
+void GCMemoryManager::initialize_gc_stat_info() {
+ assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools");
+ _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
+ _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools());
+ // tracking concurrent collections we need two objects: one to update, and one to
+ // hold the publicly available "last (completed) gc" information.
+}
+
+void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
+ bool recordAccumulatedGCTime) {
+ assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
+ if (recordAccumulatedGCTime) {
+ _accumulated_timer.start();
+ }
+ // _num_collections now increases in gc_end, to count completed collections
+ if (recordGCBeginTime) {
+ _current_gc_stat->set_index(_num_collections+1);
+ _current_gc_stat->set_start_time(Management::timestamp());
+ }
+
+ if (recordPreGCUsage) {
+ // Keep memory usage of all memory pools
+ for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
+ MemoryPool* pool = MemoryService::get_memory_pool(i);
+ MemoryUsage usage = pool->get_memory_usage();
+ _current_gc_stat->set_before_gc_usage(i, usage);
+ HOTSPOT_MEM_POOL_GC_BEGIN(
+ (char *) name(), strlen(name()),
+ (char *) pool->name(), strlen(pool->name()),
+ usage.init_size(), usage.used(),
+ usage.committed(), usage.max_size());
+ }
+ }
+}
+
+// A collector MUST, even if it does not complete for some reason,
+// make a TraceMemoryManagerStats object where countCollection is true,
+// to ensure the current gc stat is placed in _last_gc_stat.
+void GCMemoryManager::gc_end(bool recordPostGCUsage,
+ bool recordAccumulatedGCTime,
+ bool recordGCEndTime, bool countCollection,
+ GCCause::Cause cause) {
+ if (recordAccumulatedGCTime) {
+ _accumulated_timer.stop();
+ }
+ if (recordGCEndTime) {
+ _current_gc_stat->set_end_time(Management::timestamp());
+ }
+
+ if (recordPostGCUsage) {
+ int i;
+ // keep the last gc statistics for all memory pools
+ for (i = 0; i < MemoryService::num_memory_pools(); i++) {
+ MemoryPool* pool = MemoryService::get_memory_pool(i);
+ MemoryUsage usage = pool->get_memory_usage();
+
+ HOTSPOT_MEM_POOL_GC_END(
+ (char *) name(), strlen(name()),
+ (char *) pool->name(), strlen(pool->name()),
+ usage.init_size(), usage.used(),
+ usage.committed(), usage.max_size());
+
+ _current_gc_stat->set_after_gc_usage(i, usage);
+ }
+
+ // Set last collection usage of the memory pools managed by this collector
+ for (i = 0; i < num_memory_pools(); i++) {
+ MemoryPool* pool = get_memory_pool(i);
+ MemoryUsage usage = pool->get_memory_usage();
+
+ // Compare with GC usage threshold
+ pool->set_last_collection_usage(usage);
+ LowMemoryDetector::detect_after_gc_memory(pool);
+ }
+ }
+
+ if (countCollection) {
+ _num_collections++;
+ // alternately update two objects making one public when complete
+ {
+ MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
+ GCStatInfo *tmp = _last_gc_stat;
+ _last_gc_stat = _current_gc_stat;
+ _current_gc_stat = tmp;
+ // reset the current stat for diagnosability purposes
+ _current_gc_stat->clear();
+ }
+
+ if (is_notification_enabled()) {
+ bool isMajorGC = this == MemoryService::get_major_gc_manager();
+ GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC",
+ GCCause::to_string(cause));
+ }
+ }
+}
+
+size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) {
+ MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
+ if (_last_gc_stat->gc_index() != 0) {
+ dest->set_index(_last_gc_stat->gc_index());
+ dest->set_start_time(_last_gc_stat->start_time());
+ dest->set_end_time(_last_gc_stat->end_time());
+ assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(),
+ "Must have same array size");
+ size_t len = dest->usage_array_size() * sizeof(MemoryUsage);
+ memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len);
+ memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len);
+ }
+ return _last_gc_stat->gc_index();
+}