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gc-tracer.cc
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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/heap/gc-tracer.h"
#include <cstdarg>
#include "include/v8-metrics.h"
#include "src/base/atomic-utils.h"
#include "src/base/strings.h"
#include "src/common/globals.h"
#include "src/execution/isolate.h"
#include "src/execution/thread-id.h"
#include "src/heap/cppgc-js/cpp-heap.h"
#include "src/heap/cppgc/metric-recorder.h"
#include "src/heap/heap-inl.h"
#include "src/heap/incremental-marking.h"
#include "src/heap/spaces.h"
#include "src/logging/counters.h"
#include "src/logging/metrics.h"
#include "src/logging/tracing-flags.h"
#include "src/tracing/tracing-category-observer.h"
namespace v8 {
namespace internal {
static size_t CountTotalHolesSize(Heap* heap) {
size_t holes_size = 0;
PagedSpaceIterator spaces(heap);
for (PagedSpace* space = spaces.Next(); space != nullptr;
space = spaces.Next()) {
DCHECK_GE(holes_size + space->Waste() + space->Available(), holes_size);
holes_size += space->Waste() + space->Available();
}
return holes_size;
}
#ifdef V8_RUNTIME_CALL_STATS
WorkerThreadRuntimeCallStats* GCTracer::worker_thread_runtime_call_stats() {
return heap_->isolate()->counters()->worker_thread_runtime_call_stats();
}
RuntimeCallCounterId GCTracer::RCSCounterFromScope(Scope::ScopeId id) {
STATIC_ASSERT(Scope::FIRST_SCOPE == Scope::MC_INCREMENTAL);
return static_cast<RuntimeCallCounterId>(
static_cast<int>(RuntimeCallCounterId::kGC_MC_INCREMENTAL) +
static_cast<int>(id));
}
#endif // defined(V8_RUNTIME_CALL_STATS)
double GCTracer::MonotonicallyIncreasingTimeInMs() {
if (V8_UNLIKELY(FLAG_predictable)) {
return heap_->MonotonicallyIncreasingTimeInMs();
} else {
return base::TimeTicks::Now().ToInternalValue() /
static_cast<double>(base::Time::kMicrosecondsPerMillisecond);
}
}
CollectionEpoch GCTracer::CurrentEpoch(Scope::ScopeId scope_id) {
if (Scope::NeedsYoungEpoch(scope_id)) {
return heap_->epoch_young();
} else {
return heap_->epoch_full();
}
}
GCTracer::Scope::Scope(GCTracer* tracer, ScopeId scope, ThreadKind thread_kind)
: tracer_(tracer), scope_(scope), thread_kind_(thread_kind) {
start_time_ = tracer_->MonotonicallyIncreasingTimeInMs();
#ifdef V8_RUNTIME_CALL_STATS
if (V8_LIKELY(!TracingFlags::is_runtime_stats_enabled())) return;
if (thread_kind_ == ThreadKind::kMain) {
DCHECK_EQ(tracer_->heap_->isolate()->thread_id(), ThreadId::Current());
runtime_stats_ =
tracer_->heap_->isolate()->counters()->runtime_call_stats();
runtime_stats_->Enter(&timer_, GCTracer::RCSCounterFromScope(scope));
} else {
runtime_call_stats_scope_.emplace(
tracer->worker_thread_runtime_call_stats());
runtime_stats_ = runtime_call_stats_scope_->Get();
runtime_stats_->Enter(&timer_, GCTracer::RCSCounterFromScope(scope));
}
#endif // defined(V8_RUNTIME_CALL_STATS)
}
GCTracer::Scope::~Scope() {
double duration_ms = tracer_->MonotonicallyIncreasingTimeInMs() - start_time_;
if (thread_kind_ == ThreadKind::kMain) {
DCHECK_EQ(tracer_->heap_->isolate()->thread_id(), ThreadId::Current());
tracer_->AddScopeSample(scope_, duration_ms);
if (scope_ == ScopeId::MC_INCREMENTAL ||
scope_ == ScopeId::MC_INCREMENTAL_START ||
scope_ == MC_INCREMENTAL_FINALIZE) {
auto* long_task_stats =
tracer_->heap_->isolate()->GetCurrentLongTaskStats();
long_task_stats->gc_full_incremental_wall_clock_duration_us +=
static_cast<int64_t>(duration_ms *
base::Time::kMicrosecondsPerMillisecond);
}
} else {
tracer_->AddScopeSampleBackground(scope_, duration_ms);
}
#ifdef V8_RUNTIME_CALL_STATS
if (V8_LIKELY(runtime_stats_ == nullptr)) return;
runtime_stats_->Leave(&timer_);
#endif // defined(V8_RUNTIME_CALL_STATS)
}
const char* GCTracer::Scope::Name(ScopeId id) {
#define CASE(scope) \
case Scope::scope: \
return "V8.GC_" #scope;
switch (id) {
TRACER_SCOPES(CASE)
TRACER_BACKGROUND_SCOPES(CASE)
case Scope::NUMBER_OF_SCOPES:
break;
}
#undef CASE
UNREACHABLE();
}
bool GCTracer::Scope::NeedsYoungEpoch(ScopeId id) {
#define CASE(scope) \
case Scope::scope: \
return true;
switch (id) {
TRACER_YOUNG_EPOCH_SCOPES(CASE)
default:
return false;
}
#undef CASE
UNREACHABLE();
}
GCTracer::Event::Event(Type type, GarbageCollectionReason gc_reason,
const char* collector_reason)
: type(type),
gc_reason(gc_reason),
collector_reason(collector_reason),
start_time(0.0),
end_time(0.0),
reduce_memory(false),
start_object_size(0),
end_object_size(0),
start_memory_size(0),
end_memory_size(0),
start_holes_size(0),
end_holes_size(0),
young_object_size(0),
survived_young_object_size(0),
incremental_marking_bytes(0),
incremental_marking_duration(0.0) {
for (int i = 0; i < Scope::NUMBER_OF_SCOPES; i++) {
scopes[i] = 0;
}
}
const char* GCTracer::Event::TypeName(bool short_name) const {
switch (type) {
case SCAVENGER:
return (short_name) ? "s" : "Scavenge";
case MARK_COMPACTOR:
case INCREMENTAL_MARK_COMPACTOR:
return (short_name) ? "ms" : "Mark-sweep";
case MINOR_MARK_COMPACTOR:
return (short_name) ? "mmc" : "Minor Mark-Compact";
case START:
return (short_name) ? "st" : "Start";
}
return "Unknown Event Type";
}
GCTracer::GCTracer(Heap* heap)
: heap_(heap),
current_(Event::START, GarbageCollectionReason::kUnknown, nullptr),
previous_(current_),
incremental_marking_bytes_(0),
incremental_marking_duration_(0.0),
incremental_marking_start_time_(0.0),
recorded_incremental_marking_speed_(0.0),
allocation_time_ms_(0.0),
new_space_allocation_counter_bytes_(0),
old_generation_allocation_counter_bytes_(0),
embedder_allocation_counter_bytes_(0),
allocation_duration_since_gc_(0.0),
new_space_allocation_in_bytes_since_gc_(0),
old_generation_allocation_in_bytes_since_gc_(0),
embedder_allocation_in_bytes_since_gc_(0),
combined_mark_compact_speed_cache_(0.0),
start_counter_(0),
average_mutator_duration_(0),
average_mark_compact_duration_(0),
current_mark_compact_mutator_utilization_(1.0),
previous_mark_compact_end_time_(0) {
// All accesses to incremental_marking_scope assume that incremental marking
// scopes come first.
STATIC_ASSERT(0 == Scope::FIRST_INCREMENTAL_SCOPE);
// We assume that MC_INCREMENTAL is the first scope so that we can properly
// map it to RuntimeCallStats.
STATIC_ASSERT(0 == Scope::MC_INCREMENTAL);
current_.end_time = MonotonicallyIncreasingTimeInMs();
for (int i = 0; i < Scope::NUMBER_OF_SCOPES; i++) {
background_counter_[i].total_duration_ms = 0;
}
}
void GCTracer::ResetForTesting() {
current_ = Event(Event::START, GarbageCollectionReason::kTesting, nullptr);
current_.end_time = MonotonicallyIncreasingTimeInMs();
previous_ = current_;
ResetIncrementalMarkingCounters();
allocation_time_ms_ = 0.0;
new_space_allocation_counter_bytes_ = 0.0;
old_generation_allocation_counter_bytes_ = 0.0;
allocation_duration_since_gc_ = 0.0;
new_space_allocation_in_bytes_since_gc_ = 0.0;
old_generation_allocation_in_bytes_since_gc_ = 0.0;
combined_mark_compact_speed_cache_ = 0.0;
recorded_minor_gcs_total_.Reset();
recorded_minor_gcs_survived_.Reset();
recorded_compactions_.Reset();
recorded_mark_compacts_.Reset();
recorded_incremental_mark_compacts_.Reset();
recorded_new_generation_allocations_.Reset();
recorded_old_generation_allocations_.Reset();
recorded_embedder_generation_allocations_.Reset();
recorded_survival_ratios_.Reset();
start_counter_ = 0;
average_mutator_duration_ = 0;
average_mark_compact_duration_ = 0;
current_mark_compact_mutator_utilization_ = 1.0;
previous_mark_compact_end_time_ = 0;
base::MutexGuard guard(&background_counter_mutex_);
for (int i = 0; i < Scope::NUMBER_OF_SCOPES; i++) {
background_counter_[i].total_duration_ms = 0;
}
}
void GCTracer::NotifyYoungGenerationHandling(
YoungGenerationHandling young_generation_handling) {
DCHECK(current_.type == Event::SCAVENGER || start_counter_ > 1);
heap_->isolate()->counters()->young_generation_handling()->AddSample(
static_cast<int>(young_generation_handling));
}
void GCTracer::Start(GarbageCollector collector,
GarbageCollectionReason gc_reason,
const char* collector_reason) {
start_counter_++;
if (start_counter_ != 1) return;
previous_ = current_;
switch (collector) {
case GarbageCollector::SCAVENGER:
current_ = Event(Event::SCAVENGER, gc_reason, collector_reason);
break;
case GarbageCollector::MINOR_MARK_COMPACTOR:
current_ =
Event(Event::MINOR_MARK_COMPACTOR, gc_reason, collector_reason);
break;
case GarbageCollector::MARK_COMPACTOR:
if (heap_->incremental_marking()->WasActivated()) {
current_ = Event(Event::INCREMENTAL_MARK_COMPACTOR, gc_reason,
collector_reason);
} else {
current_ = Event(Event::MARK_COMPACTOR, gc_reason, collector_reason);
}
break;
}
current_.reduce_memory = heap_->ShouldReduceMemory();
current_.start_time = MonotonicallyIncreasingTimeInMs();
current_.start_object_size = 0;
current_.start_memory_size = 0;
current_.start_holes_size = 0;
current_.young_object_size = 0;
current_.incremental_marking_bytes = 0;
current_.incremental_marking_duration = 0;
for (int i = 0; i < Scope::NUMBER_OF_SCOPES; i++) {
current_.scopes[i] = 0;
}
Counters* counters = heap_->isolate()->counters();
if (Heap::IsYoungGenerationCollector(collector)) {
counters->scavenge_reason()->AddSample(static_cast<int>(gc_reason));
} else {
counters->mark_compact_reason()->AddSample(static_cast<int>(gc_reason));
if (FLAG_trace_gc_freelists) {
PrintIsolate(heap_->isolate(),
"FreeLists statistics before collection:\n");
heap_->PrintFreeListsStats();
}
}
}
void GCTracer::StartInSafepoint() {
SampleAllocation(current_.start_time, heap_->NewSpaceAllocationCounter(),
heap_->OldGenerationAllocationCounter(),
heap_->EmbedderAllocationCounter());
current_.start_object_size = heap_->SizeOfObjects();
current_.start_memory_size = heap_->memory_allocator()->Size();
current_.start_holes_size = CountTotalHolesSize(heap_);
size_t new_space_size = (heap_->new_space() ? heap_->new_space()->Size() : 0);
size_t new_lo_space_size =
(heap_->new_lo_space() ? heap_->new_lo_space()->SizeOfObjects() : 0);
current_.young_object_size = new_space_size + new_lo_space_size;
}
void GCTracer::ResetIncrementalMarkingCounters() {
incremental_marking_bytes_ = 0;
incremental_marking_duration_ = 0;
for (int i = 0; i < Scope::NUMBER_OF_INCREMENTAL_SCOPES; i++) {
incremental_marking_scopes_[i].ResetCurrentCycle();
}
}
void GCTracer::StopInSafepoint() {
current_.end_object_size = heap_->SizeOfObjects();
current_.end_memory_size = heap_->memory_allocator()->Size();
current_.end_holes_size = CountTotalHolesSize(heap_);
current_.survived_young_object_size = heap_->SurvivedYoungObjectSize();
}
void GCTracer::Stop(GarbageCollector collector) {
start_counter_--;
if (start_counter_ != 0) {
if (FLAG_trace_gc_verbose) {
heap_->isolate()->PrintWithTimestamp(
"[Finished reentrant %s during %s.]\n",
Heap::CollectorName(collector), current_.TypeName(false));
}
return;
}
DCHECK_LE(0, start_counter_);
DCHECK((collector == GarbageCollector::SCAVENGER &&
current_.type == Event::SCAVENGER) ||
(collector == GarbageCollector::MINOR_MARK_COMPACTOR &&
current_.type == Event::MINOR_MARK_COMPACTOR) ||
(collector == GarbageCollector::MARK_COMPACTOR &&
(current_.type == Event::MARK_COMPACTOR ||
current_.type == Event::INCREMENTAL_MARK_COMPACTOR)));
current_.end_time = MonotonicallyIncreasingTimeInMs();
AddAllocation(current_.end_time);
double duration = current_.end_time - current_.start_time;
int64_t duration_us =
static_cast<int64_t>(duration * base::Time::kMicrosecondsPerMillisecond);
auto* long_task_stats = heap_->isolate()->GetCurrentLongTaskStats();
switch (current_.type) {
case Event::SCAVENGER:
case Event::MINOR_MARK_COMPACTOR:
recorded_minor_gcs_total_.Push(
MakeBytesAndDuration(current_.young_object_size, duration));
recorded_minor_gcs_survived_.Push(
MakeBytesAndDuration(current_.survived_young_object_size, duration));
FetchBackgroundMinorGCCounters();
long_task_stats->gc_young_wall_clock_duration_us += duration_us;
break;
case Event::INCREMENTAL_MARK_COMPACTOR:
current_.incremental_marking_bytes = incremental_marking_bytes_;
current_.incremental_marking_duration = incremental_marking_duration_;
for (int i = 0; i < Scope::NUMBER_OF_INCREMENTAL_SCOPES; i++) {
current_.incremental_marking_scopes[i] = incremental_marking_scopes_[i];
current_.scopes[i] = incremental_marking_scopes_[i].duration;
}
RecordMutatorUtilization(
current_.end_time, duration + current_.incremental_marking_duration);
RecordIncrementalMarkingSpeed(current_.incremental_marking_bytes,
current_.incremental_marking_duration);
recorded_incremental_mark_compacts_.Push(
MakeBytesAndDuration(current_.end_object_size, duration));
RecordGCSumCounters(duration);
ResetIncrementalMarkingCounters();
combined_mark_compact_speed_cache_ = 0.0;
FetchBackgroundMarkCompactCounters();
long_task_stats->gc_full_atomic_wall_clock_duration_us += duration_us;
break;
case Event::MARK_COMPACTOR:
DCHECK_EQ(0u, current_.incremental_marking_bytes);
DCHECK_EQ(0, current_.incremental_marking_duration);
RecordMutatorUtilization(
current_.end_time, duration + current_.incremental_marking_duration);
recorded_mark_compacts_.Push(
MakeBytesAndDuration(current_.end_object_size, duration));
RecordGCSumCounters(duration);
ResetIncrementalMarkingCounters();
combined_mark_compact_speed_cache_ = 0.0;
FetchBackgroundMarkCompactCounters();
long_task_stats->gc_full_atomic_wall_clock_duration_us += duration_us;
break;
case Event::START:
UNREACHABLE();
}
FetchBackgroundGeneralCounters();
heap_->UpdateTotalGCTime(duration);
if ((current_.type == Event::SCAVENGER ||
current_.type == Event::MINOR_MARK_COMPACTOR) &&
FLAG_trace_gc_ignore_scavenger)
return;
if (FLAG_trace_gc_nvp) {
PrintNVP();
} else {
Print();
}
if (FLAG_trace_gc) {
heap_->PrintShortHeapStatistics();
}
if (V8_UNLIKELY(TracingFlags::gc.load(std::memory_order_relaxed) &
v8::tracing::TracingCategoryObserver::ENABLED_BY_TRACING)) {
std::stringstream heap_stats;
heap_->DumpJSONHeapStatistics(heap_stats);
TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("v8.gc"), "V8.GC_Heap_Stats",
TRACE_EVENT_SCOPE_THREAD, "stats",
TRACE_STR_COPY(heap_stats.str().c_str()));
}
}
void GCTracer::NotifySweepingCompleted() {
if (FLAG_trace_gc_freelists) {
PrintIsolate(heap_->isolate(),
"FreeLists statistics after sweeping completed:\n");
heap_->PrintFreeListsStats();
}
if (FLAG_trace_allocations_origins) {
heap_->new_space()->PrintAllocationsOrigins();
heap_->old_space()->PrintAllocationsOrigins();
heap_->code_space()->PrintAllocationsOrigins();
heap_->map_space()->PrintAllocationsOrigins();
}
metrics_report_pending_ = true;
NotifyGCCompleted();
}
void GCTracer::SampleAllocation(double current_ms,
size_t new_space_counter_bytes,
size_t old_generation_counter_bytes,
size_t embedder_counter_bytes) {
if (allocation_time_ms_ == 0) {
// It is the first sample.
allocation_time_ms_ = current_ms;
new_space_allocation_counter_bytes_ = new_space_counter_bytes;
old_generation_allocation_counter_bytes_ = old_generation_counter_bytes;
embedder_allocation_counter_bytes_ = embedder_counter_bytes;
return;
}
// This assumes that counters are unsigned integers so that the subtraction
// below works even if the new counter is less than the old counter.
size_t new_space_allocated_bytes =
new_space_counter_bytes - new_space_allocation_counter_bytes_;
size_t old_generation_allocated_bytes =
old_generation_counter_bytes - old_generation_allocation_counter_bytes_;
size_t embedder_allocated_bytes =
embedder_counter_bytes - embedder_allocation_counter_bytes_;
double duration = current_ms - allocation_time_ms_;
allocation_time_ms_ = current_ms;
new_space_allocation_counter_bytes_ = new_space_counter_bytes;
old_generation_allocation_counter_bytes_ = old_generation_counter_bytes;
embedder_allocation_counter_bytes_ = embedder_counter_bytes;
allocation_duration_since_gc_ += duration;
new_space_allocation_in_bytes_since_gc_ += new_space_allocated_bytes;
old_generation_allocation_in_bytes_since_gc_ +=
old_generation_allocated_bytes;
embedder_allocation_in_bytes_since_gc_ += embedder_allocated_bytes;
}
void GCTracer::AddAllocation(double current_ms) {
allocation_time_ms_ = current_ms;
if (allocation_duration_since_gc_ > 0) {
recorded_new_generation_allocations_.Push(
MakeBytesAndDuration(new_space_allocation_in_bytes_since_gc_,
allocation_duration_since_gc_));
recorded_old_generation_allocations_.Push(
MakeBytesAndDuration(old_generation_allocation_in_bytes_since_gc_,
allocation_duration_since_gc_));
recorded_embedder_generation_allocations_.Push(MakeBytesAndDuration(
embedder_allocation_in_bytes_since_gc_, allocation_duration_since_gc_));
}
allocation_duration_since_gc_ = 0;
new_space_allocation_in_bytes_since_gc_ = 0;
old_generation_allocation_in_bytes_since_gc_ = 0;
embedder_allocation_in_bytes_since_gc_ = 0;
}
void GCTracer::AddCompactionEvent(double duration,
size_t live_bytes_compacted) {
recorded_compactions_.Push(
MakeBytesAndDuration(live_bytes_compacted, duration));
}
void GCTracer::AddSurvivalRatio(double promotion_ratio) {
recorded_survival_ratios_.Push(promotion_ratio);
}
void GCTracer::AddIncrementalMarkingStep(double duration, size_t bytes) {
if (bytes > 0) {
incremental_marking_bytes_ += bytes;
incremental_marking_duration_ += duration;
}
ReportIncrementalMarkingStepToRecorder();
}
void GCTracer::Output(const char* format, ...) const {
if (FLAG_trace_gc) {
va_list arguments;
va_start(arguments, format);
base::OS::VPrint(format, arguments);
va_end(arguments);
}
const int kBufferSize = 256;
char raw_buffer[kBufferSize];
base::Vector<char> buffer(raw_buffer, kBufferSize);
va_list arguments2;
va_start(arguments2, format);
base::VSNPrintF(buffer, format, arguments2);
va_end(arguments2);
heap_->AddToRingBuffer(buffer.begin());
}
void GCTracer::Print() const {
double duration = current_.end_time - current_.start_time;
const size_t kIncrementalStatsSize = 128;
char incremental_buffer[kIncrementalStatsSize] = {0};
if (current_.type == Event::INCREMENTAL_MARK_COMPACTOR) {
base::OS::SNPrintF(
incremental_buffer, kIncrementalStatsSize,
" (+ %.1f ms in %d steps since start of marking, "
"biggest step %.1f ms, walltime since start of marking %.f ms)",
current_.scopes[Scope::MC_INCREMENTAL],
current_.incremental_marking_scopes[Scope::MC_INCREMENTAL].steps,
current_.incremental_marking_scopes[Scope::MC_INCREMENTAL].longest_step,
current_.end_time - incremental_marking_start_time_);
}
// Avoid PrintF as Output also appends the string to the tracing ring buffer
// that gets printed on OOM failures.
Output(
"[%d:%p] "
"%8.0f ms: "
"%s%s %.1f (%.1f) -> %.1f (%.1f) MB, "
"%.1f / %.1f ms %s (average mu = %.3f, current mu = %.3f) %s %s\n",
base::OS::GetCurrentProcessId(),
reinterpret_cast<void*>(heap_->isolate()),
heap_->isolate()->time_millis_since_init(), current_.TypeName(false),
current_.reduce_memory ? " (reduce)" : "",
static_cast<double>(current_.start_object_size) / MB,
static_cast<double>(current_.start_memory_size) / MB,
static_cast<double>(current_.end_object_size) / MB,
static_cast<double>(current_.end_memory_size) / MB, duration,
TotalExternalTime(), incremental_buffer,
AverageMarkCompactMutatorUtilization(),
CurrentMarkCompactMutatorUtilization(),
Heap::GarbageCollectionReasonToString(current_.gc_reason),
current_.collector_reason != nullptr ? current_.collector_reason : "");
}
void GCTracer::PrintNVP() const {
double duration = current_.end_time - current_.start_time;
double spent_in_mutator = current_.start_time - previous_.end_time;
size_t allocated_since_last_gc =
current_.start_object_size - previous_.end_object_size;
double incremental_walltime_duration = 0;
if (current_.type == Event::INCREMENTAL_MARK_COMPACTOR) {
incremental_walltime_duration =
current_.end_time - incremental_marking_start_time_;
}
switch (current_.type) {
case Event::SCAVENGER:
heap_->isolate()->PrintWithTimestamp(
"pause=%.1f "
"mutator=%.1f "
"gc=%s "
"reduce_memory=%d "
"time_to_safepoint=%.2f "
"heap.prologue=%.2f "
"heap.epilogue=%.2f "
"heap.epilogue.reduce_new_space=%.2f "
"heap.external.prologue=%.2f "
"heap.external.epilogue=%.2f "
"heap.external_weak_global_handles=%.2f "
"fast_promote=%.2f "
"complete.sweep_array_buffers=%.2f "
"scavenge=%.2f "
"scavenge.free_remembered_set=%.2f "
"scavenge.roots=%.2f "
"scavenge.weak=%.2f "
"scavenge.weak_global_handles.identify=%.2f "
"scavenge.weak_global_handles.process=%.2f "
"scavenge.parallel=%.2f "
"scavenge.update_refs=%.2f "
"scavenge.sweep_array_buffers=%.2f "
"background.scavenge.parallel=%.2f "
"background.unmapper=%.2f "
"unmapper=%.2f "
"incremental.steps_count=%d "
"incremental.steps_took=%.1f "
"scavenge_throughput=%.f "
"total_size_before=%zu "
"total_size_after=%zu "
"holes_size_before=%zu "
"holes_size_after=%zu "
"allocated=%zu "
"promoted=%zu "
"semi_space_copied=%zu "
"nodes_died_in_new=%d "
"nodes_copied_in_new=%d "
"nodes_promoted=%d "
"promotion_ratio=%.1f%% "
"average_survival_ratio=%.1f%% "
"promotion_rate=%.1f%% "
"semi_space_copy_rate=%.1f%% "
"new_space_allocation_throughput=%.1f "
"unmapper_chunks=%d\n",
duration, spent_in_mutator, current_.TypeName(true),
current_.reduce_memory, current_.scopes[Scope::TIME_TO_SAFEPOINT],
current_.scopes[Scope::HEAP_PROLOGUE],
current_.scopes[Scope::HEAP_EPILOGUE],
current_.scopes[Scope::HEAP_EPILOGUE_REDUCE_NEW_SPACE],
current_.scopes[Scope::HEAP_EXTERNAL_PROLOGUE],
current_.scopes[Scope::HEAP_EXTERNAL_EPILOGUE],
current_.scopes[Scope::HEAP_EXTERNAL_WEAK_GLOBAL_HANDLES],
current_.scopes[Scope::SCAVENGER_FAST_PROMOTE],
current_.scopes[Scope::SCAVENGER_COMPLETE_SWEEP_ARRAY_BUFFERS],
current_.scopes[Scope::SCAVENGER_SCAVENGE],
current_.scopes[Scope::SCAVENGER_FREE_REMEMBERED_SET],
current_.scopes[Scope::SCAVENGER_SCAVENGE_ROOTS],
current_.scopes[Scope::SCAVENGER_SCAVENGE_WEAK],
current_
.scopes[Scope::SCAVENGER_SCAVENGE_WEAK_GLOBAL_HANDLES_IDENTIFY],
current_
.scopes[Scope::SCAVENGER_SCAVENGE_WEAK_GLOBAL_HANDLES_PROCESS],
current_.scopes[Scope::SCAVENGER_SCAVENGE_PARALLEL],
current_.scopes[Scope::SCAVENGER_SCAVENGE_UPDATE_REFS],
current_.scopes[Scope::SCAVENGER_SWEEP_ARRAY_BUFFERS],
current_.scopes[Scope::SCAVENGER_BACKGROUND_SCAVENGE_PARALLEL],
current_.scopes[Scope::BACKGROUND_UNMAPPER],
current_.scopes[Scope::UNMAPPER],
current_.incremental_marking_scopes[GCTracer::Scope::MC_INCREMENTAL]
.steps,
current_.scopes[Scope::MC_INCREMENTAL],
ScavengeSpeedInBytesPerMillisecond(), current_.start_object_size,
current_.end_object_size, current_.start_holes_size,
current_.end_holes_size, allocated_since_last_gc,
heap_->promoted_objects_size(),
heap_->semi_space_copied_object_size(),
heap_->nodes_died_in_new_space_, heap_->nodes_copied_in_new_space_,
heap_->nodes_promoted_, heap_->promotion_ratio_,
AverageSurvivalRatio(), heap_->promotion_rate_,
heap_->semi_space_copied_rate_,
NewSpaceAllocationThroughputInBytesPerMillisecond(),
heap_->memory_allocator()->unmapper()->NumberOfChunks());
break;
case Event::MINOR_MARK_COMPACTOR:
heap_->isolate()->PrintWithTimestamp(
"pause=%.1f "
"mutator=%.1f "
"gc=%s "
"reduce_memory=%d "
"minor_mc=%.2f "
"finish_sweeping=%.2f "
"time_to_safepoint=%.2f "
"mark=%.2f "
"mark.seed=%.2f "
"mark.roots=%.2f "
"mark.weak=%.2f "
"mark.global_handles=%.2f "
"clear=%.2f "
"clear.string_table=%.2f "
"clear.weak_lists=%.2f "
"evacuate=%.2f "
"evacuate.copy=%.2f "
"evacuate.update_pointers=%.2f "
"evacuate.update_pointers.to_new_roots=%.2f "
"evacuate.update_pointers.slots=%.2f "
"background.mark=%.2f "
"background.evacuate.copy=%.2f "
"background.evacuate.update_pointers=%.2f "
"background.unmapper=%.2f "
"unmapper=%.2f "
"update_marking_deque=%.2f "
"reset_liveness=%.2f\n",
duration, spent_in_mutator, "mmc", current_.reduce_memory,
current_.scopes[Scope::MINOR_MC],
current_.scopes[Scope::MINOR_MC_SWEEPING],
current_.scopes[Scope::TIME_TO_SAFEPOINT],
current_.scopes[Scope::MINOR_MC_MARK],
current_.scopes[Scope::MINOR_MC_MARK_SEED],
current_.scopes[Scope::MINOR_MC_MARK_ROOTS],
current_.scopes[Scope::MINOR_MC_MARK_WEAK],
current_.scopes[Scope::MINOR_MC_MARK_GLOBAL_HANDLES],
current_.scopes[Scope::MINOR_MC_CLEAR],
current_.scopes[Scope::MINOR_MC_CLEAR_STRING_TABLE],
current_.scopes[Scope::MINOR_MC_CLEAR_WEAK_LISTS],
current_.scopes[Scope::MINOR_MC_EVACUATE],
current_.scopes[Scope::MINOR_MC_EVACUATE_COPY],
current_.scopes[Scope::MINOR_MC_EVACUATE_UPDATE_POINTERS],
current_
.scopes[Scope::MINOR_MC_EVACUATE_UPDATE_POINTERS_TO_NEW_ROOTS],
current_.scopes[Scope::MINOR_MC_EVACUATE_UPDATE_POINTERS_SLOTS],
current_.scopes[Scope::MINOR_MC_BACKGROUND_MARKING],
current_.scopes[Scope::MINOR_MC_BACKGROUND_EVACUATE_COPY],
current_.scopes[Scope::MINOR_MC_BACKGROUND_EVACUATE_UPDATE_POINTERS],
current_.scopes[Scope::BACKGROUND_UNMAPPER],
current_.scopes[Scope::UNMAPPER],
current_.scopes[Scope::MINOR_MC_MARKING_DEQUE],
current_.scopes[Scope::MINOR_MC_RESET_LIVENESS]);
break;
case Event::MARK_COMPACTOR:
case Event::INCREMENTAL_MARK_COMPACTOR:
heap_->isolate()->PrintWithTimestamp(
"pause=%.1f "
"mutator=%.1f "
"gc=%s "
"reduce_memory=%d "
"time_to_safepoint=%.2f "
"heap.prologue=%.2f "
"heap.embedder_tracing_epilogue=%.2f "
"heap.epilogue=%.2f "
"heap.epilogue.reduce_new_space=%.2f "
"heap.external.prologue=%.1f "
"heap.external.epilogue=%.1f "
"heap.external.weak_global_handles=%.1f "
"clear=%1.f "
"clear.dependent_code=%.1f "
"clear.maps=%.1f "
"clear.slots_buffer=%.1f "
"clear.string_table=%.1f "
"clear.weak_collections=%.1f "
"clear.weak_lists=%.1f "
"clear.weak_references=%.1f "
"complete.sweep_array_buffers=%.1f "
"epilogue=%.1f "
"evacuate=%.1f "
"evacuate.candidates=%.1f "
"evacuate.clean_up=%.1f "
"evacuate.copy=%.1f "
"evacuate.prologue=%.1f "
"evacuate.epilogue=%.1f "
"evacuate.rebalance=%.1f "
"evacuate.update_pointers=%.1f "
"evacuate.update_pointers.to_new_roots=%.1f "
"evacuate.update_pointers.slots.main=%.1f "
"evacuate.update_pointers.weak=%.1f "
"finish=%.1f "
"finish.sweep_array_buffers=%.1f "
"mark=%.1f "
"mark.finish_incremental=%.1f "
"mark.roots=%.1f "
"mark.main=%.1f "
"mark.weak_closure=%.1f "
"mark.weak_closure.ephemeron=%.1f "
"mark.weak_closure.ephemeron.marking=%.1f "
"mark.weak_closure.ephemeron.linear=%.1f "
"mark.weak_closure.weak_handles=%.1f "
"mark.weak_closure.weak_roots=%.1f "
"mark.weak_closure.harmony=%.1f "
"mark.embedder_prologue=%.1f "
"mark.embedder_tracing=%.1f "
"prologue=%.1f "
"sweep=%.1f "
"sweep.code=%.1f "
"sweep.map=%.1f "
"sweep.old=%.1f "
"incremental=%.1f "
"incremental.finalize=%.1f "
"incremental.finalize.body=%.1f "
"incremental.finalize.external.prologue=%.1f "
"incremental.finalize.external.epilogue=%.1f "
"incremental.layout_change=%.1f "
"incremental.sweep_array_buffers=%.1f "
"incremental.sweeping=%.1f "
"incremental.embedder_prologue=%.1f "
"incremental.embedder_tracing=%.1f "
"incremental_wrapper_tracing_longest_step=%.1f "
"incremental_finalize_longest_step=%.1f "
"incremental_finalize_steps_count=%d "
"incremental_longest_step=%.1f "
"incremental_steps_count=%d "
"incremental_marking_throughput=%.f "
"incremental_walltime_duration=%.f "
"background.mark=%.1f "
"background.sweep=%.1f "
"background.evacuate.copy=%.1f "
"background.evacuate.update_pointers=%.1f "
"background.unmapper=%.1f "
"unmapper=%.1f "
"total_size_before=%zu "
"total_size_after=%zu "
"holes_size_before=%zu "
"holes_size_after=%zu "
"allocated=%zu "
"promoted=%zu "
"semi_space_copied=%zu "
"nodes_died_in_new=%d "
"nodes_copied_in_new=%d "
"nodes_promoted=%d "
"promotion_ratio=%.1f%% "
"average_survival_ratio=%.1f%% "
"promotion_rate=%.1f%% "
"semi_space_copy_rate=%.1f%% "
"new_space_allocation_throughput=%.1f "
"unmapper_chunks=%d "
"compaction_speed=%.f\n",
duration, spent_in_mutator, current_.TypeName(true),
current_.reduce_memory, current_.scopes[Scope::TIME_TO_SAFEPOINT],
current_.scopes[Scope::HEAP_PROLOGUE],
current_.scopes[Scope::HEAP_EMBEDDER_TRACING_EPILOGUE],
current_.scopes[Scope::HEAP_EPILOGUE],
current_.scopes[Scope::HEAP_EPILOGUE_REDUCE_NEW_SPACE],
current_.scopes[Scope::HEAP_EXTERNAL_PROLOGUE],
current_.scopes[Scope::HEAP_EXTERNAL_EPILOGUE],
current_.scopes[Scope::HEAP_EXTERNAL_WEAK_GLOBAL_HANDLES],
current_.scopes[Scope::MC_CLEAR],
current_.scopes[Scope::MC_CLEAR_DEPENDENT_CODE],
current_.scopes[Scope::MC_CLEAR_MAPS],
current_.scopes[Scope::MC_CLEAR_SLOTS_BUFFER],
current_.scopes[Scope::MC_CLEAR_STRING_TABLE],
current_.scopes[Scope::MC_CLEAR_WEAK_COLLECTIONS],
current_.scopes[Scope::MC_CLEAR_WEAK_LISTS],
current_.scopes[Scope::MC_CLEAR_WEAK_REFERENCES],
current_.scopes[Scope::MC_COMPLETE_SWEEP_ARRAY_BUFFERS],
current_.scopes[Scope::MC_EPILOGUE],
current_.scopes[Scope::MC_EVACUATE],
current_.scopes[Scope::MC_EVACUATE_CANDIDATES],
current_.scopes[Scope::MC_EVACUATE_CLEAN_UP],
current_.scopes[Scope::MC_EVACUATE_COPY],
current_.scopes[Scope::MC_EVACUATE_PROLOGUE],
current_.scopes[Scope::MC_EVACUATE_EPILOGUE],
current_.scopes[Scope::MC_EVACUATE_REBALANCE],
current_.scopes[Scope::MC_EVACUATE_UPDATE_POINTERS],
current_.scopes[Scope::MC_EVACUATE_UPDATE_POINTERS_TO_NEW_ROOTS],
current_.scopes[Scope::MC_EVACUATE_UPDATE_POINTERS_SLOTS_MAIN],
current_.scopes[Scope::MC_EVACUATE_UPDATE_POINTERS_WEAK],
current_.scopes[Scope::MC_FINISH],
current_.scopes[Scope::MC_FINISH_SWEEP_ARRAY_BUFFERS],
current_.scopes[Scope::MC_MARK],
current_.scopes[Scope::MC_MARK_FINISH_INCREMENTAL],
current_.scopes[Scope::MC_MARK_ROOTS],
current_.scopes[Scope::MC_MARK_MAIN],
current_.scopes[Scope::MC_MARK_WEAK_CLOSURE],
current_.scopes[Scope::MC_MARK_WEAK_CLOSURE_EPHEMERON],
current_.scopes[Scope::MC_MARK_WEAK_CLOSURE_EPHEMERON_MARKING],
current_.scopes[Scope::MC_MARK_WEAK_CLOSURE_EPHEMERON_LINEAR],
current_.scopes[Scope::MC_MARK_WEAK_CLOSURE_WEAK_HANDLES],
current_.scopes[Scope::MC_MARK_WEAK_CLOSURE_WEAK_ROOTS],
current_.scopes[Scope::MC_MARK_WEAK_CLOSURE_HARMONY],
current_.scopes[Scope::MC_MARK_EMBEDDER_PROLOGUE],
current_.scopes[Scope::MC_MARK_EMBEDDER_TRACING],
current_.scopes[Scope::MC_PROLOGUE], current_.scopes[Scope::MC_SWEEP],
current_.scopes[Scope::MC_SWEEP_CODE],
current_.scopes[Scope::MC_SWEEP_MAP],
current_.scopes[Scope::MC_SWEEP_OLD],
current_.scopes[Scope::MC_INCREMENTAL],
current_.scopes[Scope::MC_INCREMENTAL_FINALIZE],
current_.scopes[Scope::MC_INCREMENTAL_FINALIZE_BODY],
current_.scopes[Scope::MC_INCREMENTAL_EXTERNAL_PROLOGUE],
current_.scopes[Scope::MC_INCREMENTAL_EXTERNAL_EPILOGUE],
current_.scopes[Scope::MC_INCREMENTAL_LAYOUT_CHANGE],
current_.scopes[Scope::MC_INCREMENTAL_START],
current_.scopes[Scope::MC_INCREMENTAL_SWEEPING],
current_.scopes[Scope::MC_INCREMENTAL_EMBEDDER_PROLOGUE],
current_.scopes[Scope::MC_INCREMENTAL_EMBEDDER_TRACING],
current_
.incremental_marking_scopes
[Scope::MC_INCREMENTAL_EMBEDDER_TRACING]
.longest_step,
current_
.incremental_marking_scopes[Scope::MC_INCREMENTAL_FINALIZE_BODY]
.longest_step,
current_
.incremental_marking_scopes[Scope::MC_INCREMENTAL_FINALIZE_BODY]
.steps,
current_.incremental_marking_scopes[Scope::MC_INCREMENTAL]
.longest_step,
current_.incremental_marking_scopes[Scope::MC_INCREMENTAL].steps,
IncrementalMarkingSpeedInBytesPerMillisecond(),
incremental_walltime_duration,
current_.scopes[Scope::MC_BACKGROUND_MARKING],
current_.scopes[Scope::MC_BACKGROUND_SWEEPING],
current_.scopes[Scope::MC_BACKGROUND_EVACUATE_COPY],
current_.scopes[Scope::MC_BACKGROUND_EVACUATE_UPDATE_POINTERS],
current_.scopes[Scope::BACKGROUND_UNMAPPER],
current_.scopes[Scope::UNMAPPER], current_.start_object_size,
current_.end_object_size, current_.start_holes_size,
current_.end_holes_size, allocated_since_last_gc,
heap_->promoted_objects_size(),
heap_->semi_space_copied_object_size(),
heap_->nodes_died_in_new_space_, heap_->nodes_copied_in_new_space_,
heap_->nodes_promoted_, heap_->promotion_ratio_,
AverageSurvivalRatio(), heap_->promotion_rate_,
heap_->semi_space_copied_rate_,
NewSpaceAllocationThroughputInBytesPerMillisecond(),
heap_->memory_allocator()->unmapper()->NumberOfChunks(),
CompactionSpeedInBytesPerMillisecond());
break;
case Event::START:
break;
default:
UNREACHABLE();
}
}
double GCTracer::AverageSpeed(const base::RingBuffer<BytesAndDuration>& buffer,
const BytesAndDuration& initial, double time_ms) {
BytesAndDuration sum = buffer.Sum(
[time_ms](BytesAndDuration a, BytesAndDuration b) {
if (time_ms != 0 && a.second >= time_ms) return a;
return std::make_pair(a.first + b.first, a.second + b.second);
},
initial);
uint64_t bytes = sum.first;
double durations = sum.second;
if (durations == 0.0) return 0;
double speed = bytes / durations;
const int max_speed = 1024 * MB;
const int min_speed = 1;
if (speed >= max_speed) return max_speed;
if (speed <= min_speed) return min_speed;
return speed;
}
double GCTracer::AverageSpeed(
const base::RingBuffer<BytesAndDuration>& buffer) {
return AverageSpeed(buffer, MakeBytesAndDuration(0, 0), 0);
}
void GCTracer::RecordIncrementalMarkingSpeed(size_t bytes, double duration) {
if (duration == 0 || bytes == 0) return;
double current_speed = bytes / duration;
if (recorded_incremental_marking_speed_ == 0) {
recorded_incremental_marking_speed_ = current_speed;
} else {
recorded_incremental_marking_speed_ =
(recorded_incremental_marking_speed_ + current_speed) / 2;
}
}
void GCTracer::RecordTimeToIncrementalMarkingTask(double time_to_task) {
if (average_time_to_incremental_marking_task_ == 0.0) {
average_time_to_incremental_marking_task_ = time_to_task;
} else {
average_time_to_incremental_marking_task_ =
(average_time_to_incremental_marking_task_ + time_to_task) / 2;
}
}
double GCTracer::AverageTimeToIncrementalMarkingTask() const {
return average_time_to_incremental_marking_task_;
}
void GCTracer::RecordEmbedderSpeed(size_t bytes, double duration) {
if (duration == 0 || bytes == 0) return;
double current_speed = bytes / duration;
if (recorded_embedder_speed_ == 0.0) {
recorded_embedder_speed_ = current_speed;
} else {
recorded_embedder_speed_ = (recorded_embedder_speed_ + current_speed) / 2;
}
}
void GCTracer::RecordMutatorUtilization(double mark_compact_end_time,
double mark_compact_duration) {
if (previous_mark_compact_end_time_ == 0) {
// The first event only contributes to previous_mark_compact_end_time_,
// because we cannot compute the mutator duration.
previous_mark_compact_end_time_ = mark_compact_end_time;
} else {
double total_duration =
mark_compact_end_time - previous_mark_compact_end_time_;
double mutator_duration = total_duration - mark_compact_duration;
if (average_mark_compact_duration_ == 0 && average_mutator_duration_ == 0) {