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             : 
      13           6 : std::unique_ptr<TracingCpuProfiler> TracingCpuProfiler::Create(
      14             :     v8::Isolate* isolate) {
      15             :   return std::unique_ptr<TracingCpuProfiler>(
      16             :       new internal::TracingCpuProfilerImpl(
      17          12 :           reinterpret_cast<internal::Isolate*>(isolate)));
      18             : }
      19             : 
      20             : namespace internal {
      21             : 
      22           6 : TracingCpuProfilerImpl::TracingCpuProfilerImpl(Isolate* isolate)
      23           6 :     : isolate_(isolate), profiling_enabled_(false) {
      24             :   // Make sure tracing system notices profiler categories.
      25           6 :   TRACE_EVENT_WARMUP_CATEGORY(TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler"));
      26           6 :   TRACE_EVENT_WARMUP_CATEGORY(
      27             :       TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler.hires"));
      28           6 :   V8::GetCurrentPlatform()->AddTraceStateObserver(this);
      29           6 : }
      30             : 
      31          18 : TracingCpuProfilerImpl::~TracingCpuProfilerImpl() {
      32           6 :   StopProfiling();
      33           6 :   V8::GetCurrentPlatform()->RemoveTraceStateObserver(this);
      34          12 : }
      35             : 
      36           6 : void TracingCpuProfilerImpl::OnTraceEnabled() {
      37             :   bool enabled;
      38          12 :   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
      39             :       TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler"), &enabled);
      40          12 :   if (!enabled) return;
      41           6 :   profiling_enabled_ = true;
      42             :   isolate_->RequestInterrupt(
      43           6 :       [](v8::Isolate*, void* data) {
      44           6 :         reinterpret_cast<TracingCpuProfilerImpl*>(data)->StartProfiling();
      45           6 :       },
      46           6 :       this);
      47             : }
      48             : 
      49           6 : void TracingCpuProfilerImpl::OnTraceDisabled() {
      50           6 :   base::LockGuard<base::Mutex> lock(&mutex_);
      51          12 :   if (!profiling_enabled_) return;
      52           6 :   profiling_enabled_ = false;
      53             :   isolate_->RequestInterrupt(
      54           6 :       [](v8::Isolate*, void* data) {
      55           6 :         reinterpret_cast<TracingCpuProfilerImpl*>(data)->StopProfiling();
      56           6 :       },
      57           6 :       this);
      58             : }
      59             : 
      60           6 : void TracingCpuProfilerImpl::StartProfiling() {
      61           6 :   base::LockGuard<base::Mutex> lock(&mutex_);
      62          18 :   if (!profiling_enabled_ || profiler_) return;
      63             :   bool enabled;
      64          12 :   TRACE_EVENT_CATEGORY_GROUP_ENABLED(
      65             :       TRACE_DISABLED_BY_DEFAULT("v8.cpu_profiler.hires"), &enabled);
      66           6 :   int sampling_interval_us = enabled ? 100 : 1000;
      67           6 :   profiler_.reset(new CpuProfiler(isolate_));
      68             :   profiler_->set_sampling_interval(
      69          12 :       base::TimeDelta::FromMicroseconds(sampling_interval_us));
      70           6 :   profiler_->StartProfiling("", true);
      71             : }
      72             : 
      73          12 : void TracingCpuProfilerImpl::StopProfiling() {
      74          12 :   base::LockGuard<base::Mutex> lock(&mutex_);
      75          24 :   if (!profiler_) return;
      76           6 :   profiler_->StopProfiling("");
      77             :   profiler_.reset();
      78             : }
      79             : 
      80             : }  // namespace internal
      81             : }  // namespace v8