1 /* 2 * Copyright (c) 2017, 2019, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #include "precompiled.hpp" 25 26 #include "jfr/jfrEvents.hpp" 27 #include "gc/shared/gcCause.hpp" 28 #include "gc/shared/gcTimer.hpp" 29 #include "gc/shared/gcTrace.hpp" 30 #include "gc/shared/gcWhen.hpp" 31 #include "gc/shenandoah/shenandoahAllocTracker.hpp" 32 #include "gc/shenandoah/shenandoahCollectorPolicy.hpp" 33 #include "gc/shenandoah/shenandoahMarkCompact.hpp" 34 #include "gc/shenandoah/shenandoahHeap.hpp" 35 #include "gc/shenandoah/shenandoahHeuristics.hpp" 36 #include "gc/shenandoah/shenandoahUtils.hpp" 37 #include "utilities/debug.hpp" 38 39 ShenandoahPhaseTimings::Phase ShenandoahGCPhase::_current_phase = ShenandoahGCPhase::_invalid_phase; 40 41 ShenandoahGCSession::ShenandoahGCSession(GCCause::Cause cause) : 42 _heap(ShenandoahHeap::heap()), 43 _timer(_heap->gc_timer()), 44 _tracer(_heap->tracer()) { 45 assert(!ShenandoahGCPhase::is_valid_phase(ShenandoahGCPhase::current_phase()), 46 "No current GC phase"); 47 48 _heap->set_gc_cause(cause); 49 _timer->register_gc_start(); 50 _tracer->report_gc_start(cause, _timer->gc_start()); 51 _heap->trace_heap(GCWhen::BeforeGC, _tracer); 52 53 _heap->shenandoah_policy()->record_cycle_start(); 54 _heap->heuristics()->record_cycle_start(); 55 _trace_cycle.initialize(_heap->cycle_memory_manager(), cause, 56 /* allMemoryPoolsAffected */ true, 57 /* recordGCBeginTime = */ true, 58 /* recordPreGCUsage = */ true, 59 /* recordPeakUsage = */ true, 60 /* recordPostGCUsage = */ true, 61 /* recordAccumulatedGCTime = */ true, 62 /* recordGCEndTime = */ true, 63 /* countCollection = */ true 64 ); 65 } 66 67 ShenandoahGCSession::~ShenandoahGCSession() { 68 _heap->heuristics()->record_cycle_end(); 69 _timer->register_gc_end(); 70 _heap->trace_heap(GCWhen::AfterGC, _tracer); 71 _tracer->report_gc_end(_timer->gc_end(), _timer->time_partitions()); 72 assert(!ShenandoahGCPhase::is_valid_phase(ShenandoahGCPhase::current_phase()), 73 "No current GC phase"); 74 _heap->set_gc_cause(GCCause::_no_gc); 75 } 76 77 ShenandoahGCPauseMark::ShenandoahGCPauseMark(uint gc_id, SvcGCMarker::reason_type type) : 78 _heap(ShenandoahHeap::heap()), _gc_id_mark(gc_id), _svc_gc_mark(type), _is_gc_active_mark() { 79 80 // FIXME: It seems that JMC throws away level 0 events, which are the Shenandoah 81 // pause events. Create this pseudo level 0 event to push real events to level 1. 82 _heap->gc_timer()->register_gc_phase_start("Shenandoah", Ticks::now()); 83 _trace_pause.initialize(_heap->stw_memory_manager(), _heap->gc_cause(), 84 /* allMemoryPoolsAffected */ true, 85 /* recordGCBeginTime = */ true, 86 /* recordPreGCUsage = */ false, 87 /* recordPeakUsage = */ false, 88 /* recordPostGCUsage = */ false, 89 /* recordAccumulatedGCTime = */ true, 90 /* recordGCEndTime = */ true, 91 /* countCollection = */ true 92 ); 93 94 _heap->heuristics()->record_gc_start(); 95 } 96 97 ShenandoahGCPauseMark::~ShenandoahGCPauseMark() { 98 _heap->gc_timer()->register_gc_phase_end(Ticks::now()); 99 _heap->heuristics()->record_gc_end(); 100 } 101 102 ShenandoahGCPhase::ShenandoahGCPhase(const ShenandoahPhaseTimings::Phase phase) : 103 _heap(ShenandoahHeap::heap()), _phase(phase) { 104 assert(!Thread::current()->is_Worker_thread() && 105 (Thread::current()->is_VM_thread() || 106 Thread::current()->is_ConcurrentGC_thread()), 107 "Must be set by these threads"); 108 _parent_phase = _current_phase; 109 _current_phase = phase; 110 111 _heap->phase_timings()->record_phase_start(_phase); 112 } 113 114 ShenandoahGCPhase::~ShenandoahGCPhase() { 115 _heap->phase_timings()->record_phase_end(_phase); 116 _current_phase = _parent_phase; 117 } 118 119 bool ShenandoahGCPhase::is_valid_phase(ShenandoahPhaseTimings::Phase phase) { 120 return phase >= 0 && phase < ShenandoahPhaseTimings::_num_phases; 121 } 122 123 bool ShenandoahGCPhase::is_root_work_phase() { 124 switch(current_phase()) { 125 case ShenandoahPhaseTimings::scan_roots: 126 case ShenandoahPhaseTimings::update_roots: 127 case ShenandoahPhaseTimings::init_evac: 128 case ShenandoahPhaseTimings::final_update_refs_roots: 129 case ShenandoahPhaseTimings::degen_gc_update_roots: 130 case ShenandoahPhaseTimings::init_traversal_gc_work: 131 case ShenandoahPhaseTimings::final_traversal_gc_work: 132 case ShenandoahPhaseTimings::final_traversal_update_roots: 133 case ShenandoahPhaseTimings::full_gc_roots: 134 return true; 135 default: 136 return false; 137 } 138 } 139 140 ShenandoahAllocTrace::ShenandoahAllocTrace(size_t words_size, ShenandoahAllocRequest::Type alloc_type) { 141 if (ShenandoahAllocationTrace) { 142 _start = os::elapsedTime(); 143 _size = words_size; 144 _alloc_type = alloc_type; 145 } else { 146 _start = 0; 147 _size = 0; 148 _alloc_type = ShenandoahAllocRequest::Type(0); 149 } 150 } 151 152 ShenandoahAllocTrace::~ShenandoahAllocTrace() { 153 if (ShenandoahAllocationTrace) { 154 double stop = os::elapsedTime(); 155 double duration_sec = stop - _start; 156 double duration_us = duration_sec * 1000000; 157 ShenandoahAllocTracker* tracker = ShenandoahHeap::heap()->alloc_tracker(); 158 assert(tracker != NULL, "Must be"); 159 tracker->record_alloc_latency(_size, _alloc_type, duration_us); 160 if (duration_us > ShenandoahAllocationStallThreshold) { 161 log_warning(gc)("Allocation stall: %.0f us (threshold: " INTX_FORMAT " us)", 162 duration_us, ShenandoahAllocationStallThreshold); 163 } 164 } 165 } 166 167 ShenandoahWorkerSession::ShenandoahWorkerSession(uint worker_id) : _worker_id(worker_id) { 168 Thread* thr = Thread::current(); 169 assert(ShenandoahThreadLocalData::worker_id(thr) == ShenandoahThreadLocalData::INVALID_WORKER_ID, "Already set"); 170 ShenandoahThreadLocalData::set_worker_id(thr, worker_id); 171 } 172 173 ShenandoahConcurrentWorkerSession::~ShenandoahConcurrentWorkerSession() { 174 // Do nothing. Per-worker events are not supported in this JDK. 175 } 176 177 ShenandoahParallelWorkerSession::~ShenandoahParallelWorkerSession() { 178 // Do nothing. Per-worker events are not supported in this JDK. 179 } 180 ShenandoahWorkerSession::~ShenandoahWorkerSession() { 181 #ifdef ASSERT 182 Thread* thr = Thread::current(); 183 assert(ShenandoahThreadLocalData::worker_id(thr) != ShenandoahThreadLocalData::INVALID_WORKER_ID, "Must be set"); 184 ShenandoahThreadLocalData::set_worker_id(thr, ShenandoahThreadLocalData::INVALID_WORKER_ID); 185 #endif 186 }