1 /* 2 * Copyright (c) 2017, 2018, 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 "gc_implementation/shenandoah/shenandoahAllocTracker.hpp" 27 #include "gc_implementation/shenandoah/shenandoahCollectorPolicy.hpp" 28 #include "gc_implementation/shenandoah/shenandoahMarkCompact.hpp" 29 #include "gc_implementation/shenandoah/shenandoahHeap.hpp" 30 #include "gc_implementation/shenandoah/shenandoahHeuristics.hpp" 31 #include "gc_implementation/shenandoah/shenandoahUtils.hpp" 32 #include "gc_implementation/shenandoah/shenandoahLogging.hpp" 33 #include "gc_interface/gcCause.hpp" 34 #include "gc_implementation/shared/gcTimer.hpp" 35 #include "gc_implementation/shared/gcWhen.hpp" 36 #include "gc_implementation/shared/gcTrace.hpp" 37 38 ShenandoahPhaseTimings::Phase ShenandoahGCPhase::_current_phase = ShenandoahGCPhase::_invalid_phase; 39 40 ShenandoahGCSession::ShenandoahGCSession(GCCause::Cause cause) : 41 _heap(ShenandoahHeap::heap()), 42 _timer(ShenandoahHeap::heap()->gc_timer()), 43 _tracer(ShenandoahHeap::heap()->tracer()) { 44 45 assert(!ShenandoahGCPhase::is_valid_phase(ShenandoahGCPhase::current_phase()), 46 "No current GC phase"); 47 48 _timer->register_gc_start(); 49 _tracer->report_gc_start(cause, _timer->gc_start()); 50 _heap->trace_heap(GCWhen::BeforeGC, _tracer); 51 52 _heap->shenandoah_policy()->record_cycle_start(); 53 _heap->heuristics()->record_cycle_start(); 54 _trace_cycle.initialize(false, _heap->gc_cause(), 55 /* recordGCBeginTime = */ true, 56 /* recordPreGCUsage = */ true, 57 /* recordPeakUsage = */ true, 58 /* recordPostGCUsage = */ true, 59 /* recordAccumulatedGCTime = */ true, 60 /* recordGCEndTime = */ true, 61 /* countCollection = */ true 62 ); 63 } 64 65 ShenandoahGCSession::~ShenandoahGCSession() { 66 ShenandoahHeap::heap()->heuristics()->record_cycle_end(); 67 _tracer->report_gc_end(_timer->gc_end(), _timer->time_partitions()); 68 _timer->register_gc_end(); 69 70 assert(!ShenandoahGCPhase::is_valid_phase(ShenandoahGCPhase::current_phase()), 71 "No current GC phase"); 72 } 73 74 ShenandoahGCPauseMark::ShenandoahGCPauseMark(SvcGCMarker::reason_type type) : 75 _heap(ShenandoahHeap::heap()), _svc_gc_mark(type), _is_gc_active_mark() { 76 // FIXME: It seems that JMC throws away level 0 events, which are the Shenandoah 77 // pause events. Create this pseudo level 0 event to push real events to level 1. 78 _heap->gc_timer()->register_gc_phase_start("Shenandoah", Ticks::now()); 79 _trace_pause.initialize(true, _heap->gc_cause(), 80 /* recordGCBeginTime = */ true, 81 /* recordPreGCUsage = */ false, 82 /* recordPeakUsage = */ false, 83 /* recordPostGCUsage = */ false, 84 /* recordAccumulatedGCTime = */ true, 85 /* recordGCEndTime = */ true, 86 /* countCollection = */ true 87 ); 88 89 _heap->heuristics()->record_gc_start(); 90 } 91 92 ShenandoahGCPauseMark::~ShenandoahGCPauseMark() { 93 _heap->gc_timer()->register_gc_phase_end(Ticks::now()); 94 _heap->heuristics()->record_gc_end(); 95 } 96 97 ShenandoahGCPhase::ShenandoahGCPhase(const ShenandoahPhaseTimings::Phase phase) : 98 _heap(ShenandoahHeap::heap()), _phase(phase) { 99 assert(Thread::current()->is_VM_thread() || 100 Thread::current()->is_ConcurrentGC_thread(), 101 "Must be set by these threads"); 102 _parent_phase = _current_phase; 103 _current_phase = phase; 104 105 _heap->phase_timings()->record_phase_start(_phase); 106 } 107 108 ShenandoahGCPhase::~ShenandoahGCPhase() { 109 _heap->phase_timings()->record_phase_end(_phase); 110 _current_phase = _parent_phase; 111 } 112 113 bool ShenandoahGCPhase::is_valid_phase(ShenandoahPhaseTimings::Phase phase) { 114 return phase >= 0 && phase < ShenandoahPhaseTimings::_num_phases; 115 } 116 117 bool ShenandoahGCPhase::is_root_work_phase() { 118 switch(current_phase()) { 119 case ShenandoahPhaseTimings::scan_roots: 120 case ShenandoahPhaseTimings::update_roots: 121 case ShenandoahPhaseTimings::init_evac: 122 case ShenandoahPhaseTimings::final_update_refs_roots: 123 case ShenandoahPhaseTimings::degen_gc_update_roots: 124 case ShenandoahPhaseTimings::full_gc_roots: 125 return true; 126 default: 127 return false; 128 } 129 } 130 131 ShenandoahAllocTrace::ShenandoahAllocTrace(size_t words_size, ShenandoahAllocRequest::Type alloc_type) { 132 if (ShenandoahAllocationTrace) { 133 _start = os::elapsedTime(); 134 _size = words_size; 135 _alloc_type = alloc_type; 136 } else { 137 _start = 0; 138 _size = 0; 139 _alloc_type = ShenandoahAllocRequest::Type(0); 140 } 141 } 142 143 ShenandoahAllocTrace::~ShenandoahAllocTrace() { 144 if (ShenandoahAllocationTrace) { 145 double stop = os::elapsedTime(); 146 double duration_sec = stop - _start; 147 double duration_us = duration_sec * 1000000; 148 ShenandoahAllocTracker* tracker = ShenandoahHeap::heap()->alloc_tracker(); 149 assert(tracker != NULL, "Must be"); 150 tracker->record_alloc_latency(_size, _alloc_type, duration_us); 151 if (duration_us > ShenandoahAllocationStallThreshold) { 152 log_warning(gc)("Allocation stall: %.0f us (threshold: " INTX_FORMAT " us)", 153 duration_us, ShenandoahAllocationStallThreshold); 154 } 155 } 156 } 157 158 ShenandoahWorkerSession::ShenandoahWorkerSession(uint worker_id) : _worker_id(worker_id) { 159 Thread* thr = Thread::current(); 160 assert(thr->worker_id() == INVALID_WORKER_ID, "Already set"); 161 thr->set_worker_id(worker_id); 162 } 163 164 ShenandoahConcurrentWorkerSession::~ShenandoahConcurrentWorkerSession() { 165 // Do nothing. Per-worker events are not supported in this JDK. 166 } 167 168 ShenandoahParallelWorkerSession::~ShenandoahParallelWorkerSession() { 169 // Do nothing. Per-worker events are not supported in this JDK. 170 } 171 172 ShenandoahWorkerSession::~ShenandoahWorkerSession() { 173 #ifdef ASSERT 174 Thread* thr = Thread::current(); 175 assert(thr->worker_id() != INVALID_WORKER_ID, "Must be set"); 176 thr->set_worker_id(INVALID_WORKER_ID); 177 #endif 178 }