/* * Copyright (c) 2011, 2025, 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 "gc/g1/g1CollectedHeap.inline.hpp" #include "gc/g1/g1MemoryPool.hpp" #include "gc/g1/g1MonitoringSupport.hpp" #include "gc/g1/g1Policy.hpp" #include "gc/shared/hSpaceCounters.hpp" #include "memory/metaspaceCounters.hpp" #include "runtime/mutexLocker.hpp" #include "services/memoryPool.hpp" class G1GenerationCounters : public GenerationCounters { protected: G1MonitoringSupport* _monitoring_support; public: G1GenerationCounters(G1MonitoringSupport* monitoring_support, const char* name, int ordinal, int spaces, size_t min_capacity, size_t max_capacity, size_t curr_capacity) : GenerationCounters(name, ordinal, spaces, min_capacity, max_capacity, curr_capacity), _monitoring_support(monitoring_support) { } }; class G1YoungGenerationCounters : public G1GenerationCounters { public: G1YoungGenerationCounters(G1MonitoringSupport* monitoring_support, const char* name, size_t max_size) : G1GenerationCounters(monitoring_support, name, 0 /* ordinal */, 3 /* spaces */, 0 /* min_capacity */, max_size, 0 /* curr_capacity */) { if (UsePerfData) { update_all(); } } void update_all() { size_t committed = _monitoring_support->young_gen_committed(); GenerationCounters::update_all(committed); } }; class G1OldGenerationCounters : public G1GenerationCounters { public: G1OldGenerationCounters(G1MonitoringSupport* monitoring_support, const char* name, size_t max_size) : G1GenerationCounters(monitoring_support, name, 1 /* ordinal */, 1 /* spaces */, 0 /* min_capacity */, max_size, 0 /* curr_capacity */) { if (UsePerfData) { update_all(); } } void update_all() { size_t committed = _monitoring_support->old_gen_committed(); GenerationCounters::update_all(committed); } }; G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) : _g1h(g1h), _young_gc_memory_manager("G1 Young Generation"), _full_gc_memory_manager("G1 Old Generation"), _conc_gc_memory_manager("G1 Concurrent GC"), _eden_space_pool(nullptr), _survivor_space_pool(nullptr), _old_gen_pool(nullptr), _young_collection_counters(nullptr), _full_collection_counters(nullptr), _conc_collection_counters(nullptr), _young_gen_counters(nullptr), _old_gen_counters(nullptr), _old_space_counters(nullptr), _eden_space_counters(nullptr), _from_space_counters(nullptr), _to_space_counters(nullptr), _overall_committed(0), _overall_used(0), _young_gen_committed(0), _old_gen_committed(0), _eden_space_committed(0), _eden_space_used(0), _survivor_space_committed(0), _survivor_space_used(0), _old_gen_used(0) { recalculate_sizes(); // Counters for garbage collections // // name "collector.0". In a generational collector this would be the // young generation collection. _young_collection_counters = new CollectorCounters("G1 young collection pauses", 0); // name "collector.1". In a generational collector this would be the // old generation collection. _full_collection_counters = new CollectorCounters("G1 full collection pauses", 1); // name "collector.2". In a generational collector this would be the // STW phases in concurrent collection. _conc_collection_counters = new CollectorCounters("G1 concurrent cycle pauses", 2); // "Generation" and "Space" counters. // // name "generation.1" This is logically the old generation in // generational GC terms. The "1, 1" parameters are for // the n-th generation (=1) with 1 space. // Counters are created from minCapacity, maxCapacity, and capacity _old_gen_counters = new G1OldGenerationCounters(this, "old", _g1h->max_capacity()); // name "generation.1.space.0" // Counters are created from maxCapacity, capacity, initCapacity, // and used. _old_space_counters = new HSpaceCounters(_old_gen_counters->name_space(), "space", 0 /* ordinal */, g1h->max_capacity() /* max_capacity */, _old_gen_committed /* init_capacity */); // Young collection set // name "generation.0". This is logically the young generation. // The "0, 3" are parameters for the n-th generation (=0) with 3 spaces. // See _old_collection_counters for additional counters _young_gen_counters = new G1YoungGenerationCounters(this, "young", _g1h->max_capacity()); const char* young_collection_name_space = _young_gen_counters->name_space(); // name "generation.0.space.0" // See _old_space_counters for additional counters _eden_space_counters = new HSpaceCounters(young_collection_name_space, "eden", 0 /* ordinal */, g1h->max_capacity() /* max_capacity */, _eden_space_committed /* init_capacity */); // name "generation.0.space.1" // See _old_space_counters for additional counters // Set the arguments to indicate that this survivor space is not used. _from_space_counters = new HSpaceCounters(young_collection_name_space, "s0", 1 /* ordinal */, 0 /* max_capacity */, 0 /* init_capacity */); // Given that this survivor space is not used, we update it here // once to reflect that its used space is 0 so that we don't have to // worry about updating it again later. if (UsePerfData) { _from_space_counters->update_used(0); } // name "generation.0.space.2" // See _old_space_counters for additional counters _to_space_counters = new HSpaceCounters(young_collection_name_space, "s1", 2 /* ordinal */, g1h->max_capacity() /* max_capacity */, _survivor_space_committed /* init_capacity */); } G1MonitoringSupport::~G1MonitoringSupport() { delete _eden_space_pool; delete _survivor_space_pool; delete _old_gen_pool; } void G1MonitoringSupport::initialize_serviceability() { _eden_space_pool = new G1EdenPool(_g1h, _eden_space_committed); _survivor_space_pool = new G1SurvivorPool(_g1h, _survivor_space_committed); _old_gen_pool = new G1OldGenPool(_g1h, _old_gen_committed, _g1h->max_capacity()); _full_gc_memory_manager.add_pool(_eden_space_pool); _full_gc_memory_manager.add_pool(_survivor_space_pool); _full_gc_memory_manager.add_pool(_old_gen_pool); _conc_gc_memory_manager.add_pool(_old_gen_pool); _young_gc_memory_manager.add_pool(_eden_space_pool); _young_gc_memory_manager.add_pool(_survivor_space_pool); _young_gc_memory_manager.add_pool(_old_gen_pool, false /* always_affected_by_gc */); } MemoryUsage G1MonitoringSupport::memory_usage() { MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); return MemoryUsage(InitialHeapSize, _overall_used, _overall_committed, _g1h->max_capacity()); } GrowableArray G1MonitoringSupport::memory_managers() { GrowableArray memory_managers(3); memory_managers.append(&_young_gc_memory_manager); memory_managers.append(&_full_gc_memory_manager); memory_managers.append(&_conc_gc_memory_manager); return memory_managers; } GrowableArray G1MonitoringSupport::memory_pools() { GrowableArray memory_pools(3); memory_pools.append(_eden_space_pool); memory_pools.append(_survivor_space_pool); memory_pools.append(_old_gen_pool); return memory_pools; } void G1MonitoringSupport::recalculate_sizes() { assert_heap_locked_or_at_safepoint(true); MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); // Recalculate all the sizes from scratch. // This never includes used bytes of current allocating heap region. _overall_used = _g1h->used_unlocked(); _eden_space_used = _g1h->eden_regions_used_bytes(); _survivor_space_used = _g1h->survivor_regions_used_bytes(); // _overall_used and _eden_space_used are obtained concurrently so // may be inconsistent with each other. To prevent _old_gen_used going negative, // use smaller value to subtract. _old_gen_used = _overall_used - MIN2(_overall_used, _eden_space_used + _survivor_space_used); uint survivor_list_length = _g1h->survivor_regions_count(); uint young_list_target_length = _g1h->policy()->young_list_target_length(); assert(young_list_target_length >= survivor_list_length, "invariant"); uint eden_list_max_length = young_list_target_length - survivor_list_length; // First calculate the committed sizes that can be calculated independently. _survivor_space_committed = survivor_list_length * G1HeapRegion::GrainBytes; _old_gen_committed = G1HeapRegion::align_up_to_region_byte_size(_old_gen_used); // Next, start with the overall committed size. _overall_committed = _g1h->capacity(); size_t committed = _overall_committed; // Remove the committed size we have calculated so far (for the // survivor and old space). assert(committed >= (_survivor_space_committed + _old_gen_committed), "sanity"); committed -= _survivor_space_committed + _old_gen_committed; // Next, calculate and remove the committed size for the eden. _eden_space_committed = (size_t) eden_list_max_length * G1HeapRegion::GrainBytes; // Somewhat defensive: be robust in case there are inaccuracies in // the calculations _eden_space_committed = MIN2(_eden_space_committed, committed); committed -= _eden_space_committed; // Finally, give the rest to the old space... _old_gen_committed += committed; // ..and calculate the young gen committed. _young_gen_committed = _eden_space_committed + _survivor_space_committed; assert(_overall_committed == (_eden_space_committed + _survivor_space_committed + _old_gen_committed), "the committed sizes should add up"); // Somewhat defensive: cap the eden used size to make sure it // never exceeds the committed size. _eden_space_used = MIN2(_eden_space_used, _eden_space_committed); // _survivor_space_used is calculated during a safepoint and _survivor_space_committed // is calculated from survivor region count * heap region size. assert(_survivor_space_used <= _survivor_space_committed, "Survivor used bytes(%zu)" " should be less than or equal to survivor committed(%zu)", _survivor_space_used, _survivor_space_committed); // _old_gen_committed is calculated in terms of _old_gen_used value. assert(_old_gen_used <= _old_gen_committed, "Old gen used bytes(%zu)" " should be less than or equal to old gen committed(%zu)", _old_gen_used, _old_gen_committed); } void G1MonitoringSupport::update_sizes() { recalculate_sizes(); if (UsePerfData) { _eden_space_counters->update_capacity(_eden_space_committed); _eden_space_counters->update_used(_eden_space_used); // only the "to" survivor space is active, so we don't need to // update the counters for the "from" survivor space _to_space_counters->update_capacity(_survivor_space_committed); _to_space_counters->update_used(_survivor_space_used); _old_space_counters->update_capacity(_old_gen_committed); _old_space_counters->update_used(_old_gen_used); _young_gen_counters->update_all(); _old_gen_counters->update_all(); MetaspaceCounters::update_performance_counters(); } } void G1MonitoringSupport::update_eden_size() { // Recalculate everything - this should be fast enough and we are sure that we do not // miss anything. recalculate_sizes(); if (UsePerfData) { _eden_space_counters->update_used(_eden_space_used); } } MemoryUsage G1MonitoringSupport::eden_space_memory_usage(size_t initial_size, size_t max_size) { MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); return MemoryUsage(initial_size, _eden_space_used, _eden_space_committed, max_size); } MemoryUsage G1MonitoringSupport::survivor_space_memory_usage(size_t initial_size, size_t max_size) { MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); return MemoryUsage(initial_size, _survivor_space_used, _survivor_space_committed, max_size); } MemoryUsage G1MonitoringSupport::old_gen_memory_usage(size_t initial_size, size_t max_size) { MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); return MemoryUsage(initial_size, _old_gen_used, _old_gen_committed, max_size); } G1MonitoringScope::G1MonitoringScope(G1MonitoringSupport* monitoring_support, CollectorCounters* collection_counters, GCMemoryManager* gc_memory_manager, const char* end_message, bool all_memory_pools_affected) : _monitoring_support(monitoring_support), _tcs(collection_counters), _tms(gc_memory_manager, G1CollectedHeap::heap()->gc_cause(), end_message, all_memory_pools_affected) { } G1MonitoringScope::~G1MonitoringScope() { _monitoring_support->update_sizes(); // Needs to be called after updating pool sizes. MemoryService::track_memory_usage(); } G1YoungGCMonitoringScope::G1YoungGCMonitoringScope(G1MonitoringSupport* monitoring_support, bool all_memory_pools_affected) : G1MonitoringScope(monitoring_support, monitoring_support->_young_collection_counters, &monitoring_support->_young_gc_memory_manager, "end of minor GC", all_memory_pools_affected) { } G1FullGCMonitoringScope::G1FullGCMonitoringScope(G1MonitoringSupport* monitoring_support) : G1MonitoringScope(monitoring_support, monitoring_support->_full_collection_counters, &monitoring_support->_full_gc_memory_manager, "end of major GC") { } G1ConcGCMonitoringScope::G1ConcGCMonitoringScope(G1MonitoringSupport* monitoring_support) : G1MonitoringScope(monitoring_support, monitoring_support->_conc_collection_counters, &monitoring_support->_conc_gc_memory_manager, "end of concurrent GC pause") { }