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// Copyright 2012 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/logging/counters.h"
#include "src/base/atomic-utils.h"
#include "src/base/platform/elapsed-timer.h"
#include "src/base/platform/time.h"
#include "src/builtins/builtins-definitions.h"
#include "src/execution/isolate.h"
#include "src/logging/log-inl.h"
#include "src/logging/log.h"
namespace v8 {
namespace internal {
StatsTable::StatsTable(Counters* counters)
: lookup_function_(nullptr),
create_histogram_function_(nullptr),
add_histogram_sample_function_(nullptr) {}
void StatsTable::SetCounterFunction(CounterLookupCallback f) {
lookup_function_ = f;
}
namespace {
std::atomic<int> unused_counter_dump{0};
}
bool StatsCounter::Enabled() { return GetPtr() != &unused_counter_dump; }
std::atomic<int>* StatsCounter::SetupPtrFromStatsTable() {
// {Init} must have been called.
DCHECK_NOT_NULL(counters_);
DCHECK_NOT_NULL(name_);
int* location = counters_->FindLocation(name_);
std::atomic<int>* ptr =
location ? base::AsAtomicPtr(location) : &unused_counter_dump;
#ifdef DEBUG
std::atomic<int>* old_ptr = ptr_.exchange(ptr, std::memory_order_release);
DCHECK_IMPLIES(old_ptr, old_ptr == ptr);
#else
ptr_.store(ptr, std::memory_order_release);
#endif
return ptr;
}
void Histogram::AddSample(int sample) {
if (Enabled()) {
counters_->AddHistogramSample(histogram_, sample);
}
}
void* Histogram::CreateHistogram() const {
return counters_->CreateHistogram(name_, min_, max_, num_buckets_);
}
void TimedHistogram::Stop(base::ElapsedTimer* timer) {
DCHECK(Enabled());
AddTimedSample(timer->Elapsed());
timer->Stop();
}
void TimedHistogram::AddTimedSample(base::TimeDelta sample) {
if (Enabled()) {
int64_t sample_int = resolution_ == TimedHistogramResolution::MICROSECOND
? sample.InMicroseconds()
: sample.InMilliseconds();
AddSample(static_cast<int>(sample_int));
}
}
void TimedHistogram::RecordAbandon(base::ElapsedTimer* timer,
Isolate* isolate) {
if (Enabled()) {
DCHECK(timer->IsStarted());
timer->Stop();
int64_t sample = resolution_ == TimedHistogramResolution::MICROSECOND
? base::TimeDelta::Max().InMicroseconds()
: base::TimeDelta::Max().InMilliseconds();
AddSample(static_cast<int>(sample));
}
if (isolate != nullptr) {
V8FileLogger::CallEventLogger(isolate, name(), v8::LogEventStatus::kEnd,
true);
}
}
#ifdef DEBUG
bool TimedHistogram::ToggleRunningState(bool expect_to_run) const {
static thread_local base::LazyInstance<
std::unordered_map<const TimedHistogram*, bool>>::type active_timer =
LAZY_INSTANCE_INITIALIZER;
bool is_running = (*active_timer.Pointer())[this];
DCHECK_NE(is_running, expect_to_run);
(*active_timer.Pointer())[this] = !is_running;
return true;
}
#endif
namespace {
static constexpr int DefaultTimedHistogramNumBuckets = 50;
}
void CountersInitializer::Visit(Histogram* histogram, const char* caption,
int min, int max, int num_buckets) {
histogram->Initialize(caption, min, max, num_buckets, counters());
}
void CountersInitializer::Visit(PercentageHistogram* histogram,
const char* caption) {
histogram->Initialize(caption, 0, 101, 100, counters());
}
void CountersInitializer::Visit(LegacyMemoryHistogram* histogram,
const char* caption) {
// Exponential histogram assigns bucket limits to points
// p[1], p[2], ... p[n] such that p[i+1] / p[i] = constant.
// The constant factor is equal to the n-th root of (high / low),
// where the n is the number of buckets, the low is the lower limit,
// the high is the upper limit.
// For n = 50, low = 1000, high = 500000: the factor = 1.13.
histogram->Initialize(caption, 1000, 500000, 50, counters());
}
void CountersInitializer::Visit(TimedHistogram* histogram, const char* caption,
int max, TimedHistogramResolution res) {
histogram->Initialize(caption, 0, max, res, DefaultTimedHistogramNumBuckets,
counters());
}
void CountersInitializer::Visit(NestedTimedHistogram* histogram,
const char* caption, int max,
TimedHistogramResolution res) {
histogram->Initialize(caption, 0, max, res, DefaultTimedHistogramNumBuckets,
counters());
}
void CountersInitializer::Visit(AggregatableHistogramTimer* histogram,
const char* caption) {
histogram->Initialize(caption, 0, 10000000, DefaultTimedHistogramNumBuckets,
counters());
}
void CountersInitializer::Visit(StatsCounter* counter, const char* caption) {
counter->Initialize(caption, counters());
}
Counters::Counters(Isolate* isolate)
:
#ifdef V8_RUNTIME_CALL_STATS
runtime_call_stats_(RuntimeCallStats::kMainIsolateThread),
worker_thread_runtime_call_stats_(),
#endif
isolate_(isolate),
stats_table_(this) {
CountersInitializer init(this);
init.Start();
}
void StatsCounterResetter::VisitStatsCounter(StatsCounter* counter,
const char* caption) {
counter->Reset();
}
void Counters::ResetCounterFunction(CounterLookupCallback f) {
stats_table_.SetCounterFunction(f);
StatsCounterResetter resetter(this);
resetter.Start();
}
void HistogramResetter::VisitHistogram(Histogram* histogram,
const char* caption) {
histogram->Reset();
}
void Counters::ResetCreateHistogramFunction(CreateHistogramCallback f) {
stats_table_.SetCreateHistogramFunction(f);
HistogramResetter resetter(this);
resetter.Start();
}
void CountersVisitor::Start() {
VisitStatsCounters();
VisitHistograms();
}
void CountersVisitor::VisitHistograms() {
#define HR(name, caption, min, max, num_buckets) \
Visit(&counters()->name##_, #caption, min, max, num_buckets);
HISTOGRAM_RANGE_LIST(HR)
#undef HR
#define HR(name, caption) Visit(&counters()->name##_, #caption);
HISTOGRAM_PERCENTAGE_LIST(HR)
#undef HR
#define HR(name, caption) Visit(&counters()->name##_, #caption);
HISTOGRAM_LEGACY_MEMORY_LIST(HR)
#undef HR
#define HT(name, caption, max, res) \
Visit(&counters()->name##_, #caption, max, TimedHistogramResolution::res);
NESTED_TIMED_HISTOGRAM_LIST(HT)
#undef HT
#define HT(name, caption, max, res) \
Visit(&counters()->name##_, #caption, max, TimedHistogramResolution::res);
NESTED_TIMED_HISTOGRAM_LIST_SLOW(HT)
#undef HT
#define HT(name, caption, max, res) \
Visit(&counters()->name##_, #caption, max, TimedHistogramResolution::res);
TIMED_HISTOGRAM_LIST(HT)
#undef HT
#define AHT(name, caption) Visit(&counters()->name##_, #caption);
AGGREGATABLE_HISTOGRAM_TIMER_LIST(AHT)
#undef AHT
}
void CountersVisitor::VisitStatsCounters() {
#define SC(name, caption) Visit(&counters()->name##_, "c:" #caption);
STATS_COUNTER_LIST(SC)
STATS_COUNTER_NATIVE_CODE_LIST(SC)
#undef SC
}
void CountersVisitor::Visit(Histogram* histogram, const char* caption, int min,
int max, int num_buckets) {
VisitHistogram(histogram, caption);
}
void CountersVisitor::Visit(TimedHistogram* histogram, const char* caption,
int max, TimedHistogramResolution res) {
VisitHistogram(histogram, caption);
}
void CountersVisitor::Visit(NestedTimedHistogram* histogram,
const char* caption, int max,
TimedHistogramResolution res) {
VisitHistogram(histogram, caption);
}
void CountersVisitor::Visit(AggregatableHistogramTimer* histogram,
const char* caption) {
VisitHistogram(histogram, caption);
}
void CountersVisitor::Visit(PercentageHistogram* histogram,
const char* caption) {
VisitHistogram(histogram, caption);
}
void CountersVisitor::Visit(LegacyMemoryHistogram* histogram,
const char* caption) {
VisitHistogram(histogram, caption);
}
void CountersVisitor::Visit(StatsCounter* counter, const char* caption) {
VisitStatsCounter(counter, caption);
}
} // namespace internal
} // namespace v8
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