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 "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
38 ShenandoahPhaseTimings::Phase ShenandoahGCPhase::_current_phase = ShenandoahGCPhase::_invalid_phase;
39
40 ShenandoahGCSession::ShenandoahGCSession(GCCause::Cause cause) :
41 _heap(ShenandoahHeap::heap()),
42 _timer(_heap->gc_timer()),
43 _tracer(_heap->tracer()) {
44 assert(!ShenandoahGCPhase::is_valid_phase(ShenandoahGCPhase::current_phase()),
45 "No current GC phase");
46
47 _timer->register_gc_start();
48 _tracer->report_gc_start(cause, _timer->gc_start());
49 _heap->trace_heap(GCWhen::BeforeGC, _tracer);
50
51 _heap->shenandoah_policy()->record_cycle_start();
52 _heap->heuristics()->record_cycle_start();
53 _trace_cycle.initialize(_heap->cycle_memory_manager(), _heap->gc_cause(),
54 /* allMemoryPoolsAffected */ true,
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 _heap->heuristics()->record_cycle_end();
67 _timer->register_gc_end();
68 _heap->trace_heap(GCWhen::AfterGC, _tracer);
69 _tracer->report_gc_end(_timer->gc_end(), _timer->time_partitions());
70 assert(!ShenandoahGCPhase::is_valid_phase(ShenandoahGCPhase::current_phase()),
71 "No current GC phase");
72 }
73
74 ShenandoahGCPauseMark::ShenandoahGCPauseMark(uint gc_id, SvcGCMarker::reason_type type) :
75 _heap(ShenandoahHeap::heap()), _gc_id_mark(gc_id), _svc_gc_mark(type), _is_gc_active_mark() {
76
77 // FIXME: It seems that JMC throws away level 0 events, which are the Shenandoah
78 // pause events. Create this pseudo level 0 event to push real events to level 1.
79 _heap->gc_timer()->register_gc_phase_start("Shenandoah", Ticks::now());
80 _trace_pause.initialize(_heap->stw_memory_manager(), _heap->gc_cause(),
81 /* allMemoryPoolsAffected */ true,
82 /* recordGCBeginTime = */ true,
83 /* recordPreGCUsage = */ false,
84 /* recordPeakUsage = */ false,
85 /* recordPostGCUsage = */ false,
86 /* recordAccumulatedGCTime = */ true,
87 /* recordGCEndTime = */ true,
88 /* countCollection = */ true
89 );
90
91 _heap->heuristics()->record_gc_start();
92 }
93
94 ShenandoahGCPauseMark::~ShenandoahGCPauseMark() {
95 _heap->gc_timer()->register_gc_phase_end(Ticks::now());
96 _heap->heuristics()->record_gc_end();
97 }
98
99 ShenandoahGCPhase::ShenandoahGCPhase(const ShenandoahPhaseTimings::Phase phase) :
100 _heap(ShenandoahHeap::heap()), _phase(phase) {
101 assert(Thread::current()->is_VM_thread() ||
102 Thread::current()->is_ConcurrentGC_thread(),
103 "Must be set by these threads");
104 _parent_phase = _current_phase;
105 _current_phase = phase;
106
107 _heap->phase_timings()->record_phase_start(_phase);
108 }
109
110 ShenandoahGCPhase::~ShenandoahGCPhase() {
111 _heap->phase_timings()->record_phase_end(_phase);
112 _current_phase = _parent_phase;
113 }
114
115 bool ShenandoahGCPhase::is_valid_phase(ShenandoahPhaseTimings::Phase phase) {
116 return phase >= 0 && phase < ShenandoahPhaseTimings::_num_phases;
117 }
118
119 bool ShenandoahGCPhase::is_root_work_phase() {
120 switch(current_phase()) {
121 case ShenandoahPhaseTimings::scan_roots:
122 case ShenandoahPhaseTimings::update_roots:
123 case ShenandoahPhaseTimings::init_evac:
124 case ShenandoahPhaseTimings::final_update_refs_roots:
125 case ShenandoahPhaseTimings::degen_gc_update_roots:
126 case ShenandoahPhaseTimings::init_traversal_gc_work:
127 case ShenandoahPhaseTimings::final_traversal_gc_work:
128 case ShenandoahPhaseTimings::final_traversal_update_roots:
129 case ShenandoahPhaseTimings::full_gc_roots:
130 return true;
131 default:
132 return false;
133 }
134 }
135
136 ShenandoahAllocTrace::ShenandoahAllocTrace(size_t words_size, ShenandoahAllocRequest::Type alloc_type) {
137 if (ShenandoahAllocationTrace) {
138 _start = os::elapsedTime();
139 _size = words_size;
140 _alloc_type = alloc_type;
141 } else {
142 _start = 0;
143 _size = 0;
144 _alloc_type = ShenandoahAllocRequest::Type(0);
145 }
146 }
147
148 ShenandoahAllocTrace::~ShenandoahAllocTrace() {
149 if (ShenandoahAllocationTrace) {
150 double stop = os::elapsedTime();
151 double duration_sec = stop - _start;
152 double duration_us = duration_sec * 1000000;
153 ShenandoahAllocTracker* tracker = ShenandoahHeap::heap()->alloc_tracker();
154 assert(tracker != NULL, "Must be");
155 tracker->record_alloc_latency(_size, _alloc_type, duration_us);
156 if (duration_us > ShenandoahAllocationStallThreshold) {
157 log_warning(gc)("Allocation stall: %.0f us (threshold: " INTX_FORMAT " us)",
158 duration_us, ShenandoahAllocationStallThreshold);
159 }
160 }
161 }
162
163 ShenandoahWorkerSession::ShenandoahWorkerSession(uint worker_id) : _worker_id(worker_id) {
164 Thread* thr = Thread::current();
165 assert(ShenandoahThreadLocalData::worker_id(thr) == ShenandoahThreadLocalData::INVALID_WORKER_ID, "Already set");
166 ShenandoahThreadLocalData::set_worker_id(thr, worker_id);
167 }
168
169 ShenandoahConcurrentWorkerSession::~ShenandoahConcurrentWorkerSession() {
170 _event.commit(GCId::current(), ShenandoahPhaseTimings::phase_name(ShenandoahGCPhase::current_phase()));
171 }
172
173 ShenandoahParallelWorkerSession::~ShenandoahParallelWorkerSession() {
174 _event.commit(GCId::current(), _worker_id, ShenandoahPhaseTimings::phase_name(ShenandoahGCPhase::current_phase()));
175 }
176 ShenandoahWorkerSession::~ShenandoahWorkerSession() {
177 #ifdef ASSERT
178 Thread* thr = Thread::current();
179 assert(ShenandoahThreadLocalData::worker_id(thr) != ShenandoahThreadLocalData::INVALID_WORKER_ID, "Must be set");
180 ShenandoahThreadLocalData::set_worker_id(thr, ShenandoahThreadLocalData::INVALID_WORKER_ID);
181 #endif
182 }