Line data    Source code

       1             : // Copyright 2016 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #include "src/profiler/tracing-cpu-profiler.h"
       6             : 
       7             : #include "src/profiler/cpu-profiler.h"
       8             : #include "src/tracing/trace-event.h"
       9             : #include "src/v8.h"
      10             : 
      11             : namespace v8 {
      12             : namespace internal {
      13             : 
      14       62883 : TracingCpuProfilerImpl::TracingCpuProfilerImpl(Isolate* isolate)
      15       62883 :     : isolate_(isolate), profiling_enabled_(false) {
      16       62883 :   V8::GetCurrentPlatform()->GetTracingController()->AddTraceStateObserver(this);
      17       62883 : }
      18             : 
      19      188604 : TracingCpuProfilerImpl::~TracingCpuProfilerImpl() {
      20       62868 :   StopProfiling();
      21       62868 :   V8::GetCurrentPlatform()->GetTracingController()->RemoveTraceStateObserver(
      22       62868 :       this);
      23      125736 : }
      24             : 
      25           1 : void TracingCpuProfilerImpl::OnTraceEnabled() {
      26             :   bool enabled;
      27           2 :   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
      28             :       TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler"), &enabled);
      29           2 :   if (!enabled) return;
      30           0 :   profiling_enabled_ = true;
      31             :   isolate_->RequestInterrupt(
      32           0 :       [](v8::Isolate*, void* data) {
      33           0 :         reinterpret_cast<TracingCpuProfilerImpl*>(data)->StartProfiling();
      34           0 :       },
      35           0 :       this);
      36             : }
      37             : 
      38           0 : void TracingCpuProfilerImpl::OnTraceDisabled() {
      39           0 :   base::MutexGuard lock(&mutex_);
      40           0 :   if (!profiling_enabled_) return;
      41           0 :   profiling_enabled_ = false;
      42             :   isolate_->RequestInterrupt(
      43           0 :       [](v8::Isolate*, void* data) {
      44           0 :         reinterpret_cast<TracingCpuProfilerImpl*>(data)->StopProfiling();
      45           0 :       },
      46           0 :       this);
      47             : }
      48             : 
      49           0 : void TracingCpuProfilerImpl::StartProfiling() {
      50           0 :   base::MutexGuard lock(&mutex_);
      51           0 :   if (!profiling_enabled_ || profiler_) return;
      52             :   bool enabled;
      53           0 :   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
      54             :       TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler.hires"), &enabled);
      55           0 :   int sampling_interval_us = enabled ? 100 : 1000;
      56           0 :   profiler_.reset(new CpuProfiler(isolate_));
      57             :   profiler_->set_sampling_interval(
      58           0 :       base::TimeDelta::FromMicroseconds(sampling_interval_us));
      59           0 :   profiler_->StartProfiling("", true);
      60             : }
      61             : 
      62       62868 : void TracingCpuProfilerImpl::StopProfiling() {
      63       62868 :   base::MutexGuard lock(&mutex_);
      64      125736 :   if (!profiler_) return;
      65           0 :   profiler_->StopProfiling("");
      66             :   profiler_.reset();
      67             : }
      68             : 
      69             : }  // namespace internal
      70      183867 : }  // namespace v8