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 "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 _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(false, 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 ShenandoahHeap::heap()->heuristics()->record_cycle_end();
69 _tracer->report_gc_end(_timer->gc_end(), _timer->time_partitions());
70 _timer->register_gc_end();
71
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(SvcGCMarker::reason_type type) :
78 _heap(ShenandoahHeap::heap()), _svc_gc_mark(type), _is_gc_active_mark() {
79 // FIXME: It seems that JMC throws away level 0 events, which are the Shenandoah
80 // pause events. Create this pseudo level 0 event to push real events to level 1.
81 _heap->gc_timer()->register_gc_phase_start("Shenandoah", Ticks::now());
82 _trace_pause.initialize(true, _heap->gc_cause(),
83 /* allMemoryPoolsAffected */ true,
84 /* recordGCBeginTime = */ true,
85 /* recordPreGCUsage = */ false,
86 /* recordPeakUsage = */ false,
87 /* recordPostGCUsage = */ false,
88 /* recordAccumulatedGCTime = */ true,
89 /* recordGCEndTime = */ true,
90 /* countCollection = */ true
91 );
92
93 _heap->heuristics()->record_gc_start();
94 }
95
96 ShenandoahGCPauseMark::~ShenandoahGCPauseMark() {
97 _heap->gc_timer()->register_gc_phase_end(Ticks::now());
98 _heap->heuristics()->record_gc_end();
99 }
100
101 ShenandoahGCPhase::ShenandoahGCPhase(const ShenandoahPhaseTimings::Phase phase) :
102 _heap(ShenandoahHeap::heap()), _phase(phase) {
103 assert(Thread::current()->is_VM_thread() ||
104 Thread::current()->is_ConcurrentGC_thread(),
105 "Must be set by these threads");
106 _parent_phase = _current_phase;
107 _current_phase = phase;
108
109 _heap->phase_timings()->record_phase_start(_phase);
110 }
111
112 ShenandoahGCPhase::~ShenandoahGCPhase() {
113 _heap->phase_timings()->record_phase_end(_phase);
114 _current_phase = _parent_phase;
115 }
116
117 bool ShenandoahGCPhase::is_valid_phase(ShenandoahPhaseTimings::Phase phase) {
118 return phase >= 0 && phase < ShenandoahPhaseTimings::_num_phases;
119 }
120
121 bool ShenandoahGCPhase::is_root_work_phase() {
122 switch(current_phase()) {
123 case ShenandoahPhaseTimings::scan_roots:
124 case ShenandoahPhaseTimings::update_roots:
125 case ShenandoahPhaseTimings::init_evac:
126 case ShenandoahPhaseTimings::final_update_refs_roots:
127 case ShenandoahPhaseTimings::degen_gc_update_roots:
128 case ShenandoahPhaseTimings::full_gc_roots:
129 return true;
130 default:
131 return false;
132 }
133 }
134
135 ShenandoahAllocTrace::ShenandoahAllocTrace(size_t words_size, ShenandoahAllocRequest::Type alloc_type) {
136 if (ShenandoahAllocationTrace) {
137 _start = os::elapsedTime();
138 _size = words_size;
139 _alloc_type = alloc_type;
140 } else {
141 _start = 0;
142 _size = 0;
143 _alloc_type = ShenandoahAllocRequest::Type(0);
144 }
145 }
146
147 ShenandoahAllocTrace::~ShenandoahAllocTrace() {
148 if (ShenandoahAllocationTrace) {
149 double stop = os::elapsedTime();
150 double duration_sec = stop - _start;
151 double duration_us = duration_sec * 1000000;
152 ShenandoahAllocTracker* tracker = ShenandoahHeap::heap()->alloc_tracker();
153 assert(tracker != NULL, "Must be");
154 tracker->record_alloc_latency(_size, _alloc_type, duration_us);
155 if (duration_us > ShenandoahAllocationStallThreshold) {
156 log_warning(gc)("Allocation stall: %.0f us (threshold: " INTX_FORMAT " us)",
157 duration_us, ShenandoahAllocationStallThreshold);
158 }
159 }
160 }
161
162 ShenandoahWorkerSession::ShenandoahWorkerSession(uint worker_id) : _worker_id(worker_id) {
163 Thread* thr = Thread::current();
164 assert(thr->worker_id() == INVALID_WORKER_ID, "Already set");
165 thr->set_worker_id(worker_id);
166 }
167
168 ShenandoahConcurrentWorkerSession::~ShenandoahConcurrentWorkerSession() {
169 // Do nothing. Per-worker events are not supported in this JDK.
170 }
171
172 ShenandoahParallelWorkerSession::~ShenandoahParallelWorkerSession() {
173 // Do nothing. Per-worker events are not supported in this JDK.
174 }
175
176 ShenandoahWorkerSession::~ShenandoahWorkerSession() {
177 #ifdef ASSERT
178 Thread* thr = Thread::current();
179 assert(thr->worker_id() != INVALID_WORKER_ID, "Must be set");
180 thr->set_worker_id(INVALID_WORKER_ID);
181 #endif
182 }