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       62442 : TracingCpuProfilerImpl::TracingCpuProfilerImpl(Isolate* isolate)
      15      124884 :     : isolate_(isolate), profiling_enabled_(false) {
      16       62442 :   V8::GetCurrentPlatform()->GetTracingController()->AddTraceStateObserver(this);
      17       62442 : }
      18             : 
      19      249707 : TracingCpuProfilerImpl::~TracingCpuProfilerImpl() {
      20       62427 :   StopProfiling();
      21      124853 :   V8::GetCurrentPlatform()->GetTracingController()->RemoveTraceStateObserver(
      22      124852 :       this);
      23      124853 : }
      24             : 
      25           6 : void TracingCpuProfilerImpl::OnTraceEnabled() {
      26             :   bool enabled;
      27          12 :   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
      28             :       TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler"), &enabled);
      29           6 :   if (!enabled) return;
      30           5 :   profiling_enabled_ = true;
      31           5 :   isolate_->RequestInterrupt(
      32           5 :       [](v8::Isolate*, void* data) {
      33           5 :         reinterpret_cast<TracingCpuProfilerImpl*>(data)->StartProfiling();
      34           5 :       },
      35           5 :       this);
      36             : }
      37             : 
      38           5 : void TracingCpuProfilerImpl::OnTraceDisabled() {
      39           5 :   base::MutexGuard lock(&mutex_);
      40           5 :   if (!profiling_enabled_) return;
      41           5 :   profiling_enabled_ = false;
      42           5 :   isolate_->RequestInterrupt(
      43           5 :       [](v8::Isolate*, void* data) {
      44           5 :         reinterpret_cast<TracingCpuProfilerImpl*>(data)->StopProfiling();
      45           5 :       },
      46           5 :       this);
      47             : }
      48             : 
      49           5 : void TracingCpuProfilerImpl::StartProfiling() {
      50           5 :   base::MutexGuard lock(&mutex_);
      51          10 :   if (!profiling_enabled_ || profiler_) return;
      52             :   bool enabled;
      53          10 :   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
      54             :       TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler.hires"), &enabled);
      55           5 :   int sampling_interval_us = enabled ? 100 : 1000;
      56           5 :   profiler_.reset(new CpuProfiler(isolate_));
      57           5 :   profiler_->set_sampling_interval(
      58           5 :       base::TimeDelta::FromMicroseconds(sampling_interval_us));
      59           5 :   profiler_->StartProfiling("", true);
      60             : }
      61             : 
      62       62432 : void TracingCpuProfilerImpl::StopProfiling() {
      63       62432 :   base::MutexGuard lock(&mutex_);
      64       62432 :   if (!profiler_) return;
      65           5 :   profiler_->StopProfiling("");
      66           5 :   profiler_.reset();
      67             : }
      68             : 
      69             : }  // namespace internal
      70      122036 : }  // namespace v8