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// Copyright 2022 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.
#ifndef V8_HEAP_GC_TRACER_INL_H_
#define V8_HEAP_GC_TRACER_INL_H_
#include "src/base/logging.h"
#include "src/base/platform/platform.h"
#include "src/execution/isolate.h"
#include "src/heap/gc-tracer.h"
#include "src/heap/heap-inl.h"
namespace v8 {
namespace internal {
constexpr GCTracer::IncrementalInfos& GCTracer::IncrementalInfos::operator+=(
base::TimeDelta delta) {
steps++;
duration += delta;
if (delta > longest_step) {
longest_step = delta;
}
return *this;
}
GCTracer::Scope::Scope(GCTracer* tracer, ScopeId scope, ThreadKind thread_kind)
: tracer_(tracer),
scope_(scope),
thread_kind_(thread_kind),
start_time_(base::TimeTicks::Now()) {
DCHECK_IMPLIES(
thread_kind_ == ThreadKind::kMain,
tracer_->heap_->IsMainThread() || tracer_->heap_->IsSharedMainThread());
#ifdef V8_RUNTIME_CALL_STATS
if (V8_LIKELY(!TracingFlags::is_runtime_stats_enabled())) return;
if (thread_kind_ == ThreadKind::kMain) {
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() {
const base::TimeDelta duration = base::TimeTicks::Now() - start_time_;
tracer_->AddScopeSample(scope_, duration);
if (thread_kind_ == ThreadKind::kMain) {
if (scope_ == ScopeId::MC_INCREMENTAL ||
scope_ == ScopeId::MC_INCREMENTAL_START ||
scope_ == ScopeId::MC_INCREMENTAL_FINALIZE) {
auto* long_task_stats =
tracer_->heap_->isolate_->GetCurrentLongTaskStats();
long_task_stats->gc_full_incremental_wall_clock_duration_us +=
duration.InMicroseconds();
}
}
#ifdef V8_RUNTIME_CALL_STATS
if (V8_LIKELY(runtime_stats_ == nullptr)) return;
runtime_stats_->Leave(&timer_);
#endif // defined(V8_RUNTIME_CALL_STATS)
}
constexpr 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)
default:
return nullptr;
}
#undef CASE
}
constexpr 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
}
constexpr int GCTracer::Scope::IncrementalOffset(ScopeId id) {
DCHECK_LE(FIRST_INCREMENTAL_SCOPE, id);
DCHECK_GE(LAST_INCREMENTAL_SCOPE, id);
return id - FIRST_INCREMENTAL_SCOPE;
}
constexpr bool GCTracer::Event::IsYoungGenerationEvent(Type type) {
DCHECK_NE(Type::START, type);
return type == Type::SCAVENGER || type == Type::MINOR_MARK_SWEEPER ||
type == Type::INCREMENTAL_MINOR_MARK_SWEEPER;
}
CollectionEpoch GCTracer::CurrentEpoch(Scope::ScopeId id) const {
return Scope::NeedsYoungEpoch(id) ? epoch_young_ : epoch_full_;
}
double GCTracer::current_scope(Scope::ScopeId id) const {
DCHECK_GT(Scope::NUMBER_OF_SCOPES, id);
return current_.scopes[id].InMillisecondsF();
}
constexpr const GCTracer::IncrementalInfos& GCTracer::incremental_scope(
Scope::ScopeId id) const {
return incremental_scopes_[Scope::IncrementalOffset(id)];
}
void GCTracer::AddScopeSample(Scope::ScopeId id, base::TimeDelta duration) {
if (Scope::FIRST_INCREMENTAL_SCOPE <= id &&
id <= Scope::LAST_INCREMENTAL_SCOPE) {
incremental_scopes_[Scope::IncrementalOffset(id)] += duration;
} else if (Scope::FIRST_BACKGROUND_SCOPE <= id &&
id <= Scope::LAST_BACKGROUND_SCOPE) {
base::MutexGuard guard(&background_scopes_mutex_);
background_scopes_[id] += duration;
} else {
DCHECK_GT(Scope::NUMBER_OF_SCOPES, id);
current_.scopes[id] += duration;
}
}
#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)
} // namespace internal
} // namespace v8
#endif // V8_HEAP_GC_TRACER_INL_H_
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