1 // Copyright 2013 The Chromium 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.
5 #include "base/debug/trace_event_system_stats_monitor.h"
7 #include "base/debug/leak_annotations.h"
8 #include "base/debug/trace_event.h"
9 #include "base/json/json_writer.h"
10 #include "base/lazy_instance.h"
11 #include "base/logging.h"
12 #include "base/memory/scoped_ptr.h"
13 #include "base/strings/string_number_conversions.h"
14 #include "base/strings/string_util.h"
15 #include "base/thread_task_runner_handle.h"
16 #include "base/threading/thread_local_storage.h"
23 /////////////////////////////////////////////////////////////////////////////
24 // Holds profiled system stats until the tracing system needs to serialize it.
25 class SystemStatsHolder : public base::debug::ConvertableToTraceFormat {
27 SystemStatsHolder() { }
29 // Fills system_metrics_ with profiled system memory and disk stats.
30 // Uses the previous stats to compute rates if this is not the first profile.
31 void GetSystemProfilingStats();
33 // base::debug::ConvertableToTraceFormat overrides:
34 virtual void AppendAsTraceFormat(std::string* out) const OVERRIDE {
35 AppendSystemProfileAsTraceFormat(system_stats_, out);
39 virtual ~SystemStatsHolder() { }
41 SystemMetrics system_stats_;
43 DISALLOW_COPY_AND_ASSIGN(SystemStatsHolder);
46 void SystemStatsHolder::GetSystemProfilingStats() {
47 system_stats_ = SystemMetrics::Sample();
52 //////////////////////////////////////////////////////////////////////////////
54 TraceEventSystemStatsMonitor::TraceEventSystemStatsMonitor(
55 scoped_refptr<SingleThreadTaskRunner> task_runner)
56 : task_runner_(task_runner),
58 // Force the "system_stats" category to show up in the trace viewer.
59 TraceLog::GetCategoryGroupEnabled(TRACE_DISABLED_BY_DEFAULT("system_stats"));
61 // Allow this to be instantiated on unsupported platforms, but don't run.
62 TraceLog::GetInstance()->AddEnabledStateObserver(this);
65 TraceEventSystemStatsMonitor::~TraceEventSystemStatsMonitor() {
66 if (dump_timer_.IsRunning())
68 TraceLog::GetInstance()->RemoveEnabledStateObserver(this);
71 void TraceEventSystemStatsMonitor::OnTraceLogEnabled() {
72 // Check to see if system tracing is enabled.
75 TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT(
76 "system_stats"), &enabled);
79 task_runner_->PostTask(
81 base::Bind(&TraceEventSystemStatsMonitor::StartProfiling,
82 weak_factory_.GetWeakPtr()));
85 void TraceEventSystemStatsMonitor::OnTraceLogDisabled() {
86 task_runner_->PostTask(
88 base::Bind(&TraceEventSystemStatsMonitor::StopProfiling,
89 weak_factory_.GetWeakPtr()));
92 void TraceEventSystemStatsMonitor::StartProfiling() {
93 // Watch for the tracing framework sending enabling more than once.
94 if (dump_timer_.IsRunning())
97 dump_timer_.Start(FROM_HERE,
98 TimeDelta::FromMilliseconds(TraceEventSystemStatsMonitor::
99 kSamplingIntervalMilliseconds),
100 base::Bind(&TraceEventSystemStatsMonitor::
102 weak_factory_.GetWeakPtr()));
105 // If system tracing is enabled, dumps a profile to the tracing system.
106 void TraceEventSystemStatsMonitor::DumpSystemStats() {
107 scoped_refptr<SystemStatsHolder> dump_holder = new SystemStatsHolder();
108 dump_holder->GetSystemProfilingStats();
110 TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
111 TRACE_DISABLED_BY_DEFAULT("system_stats"),
112 "base::TraceEventSystemStatsMonitor::SystemStats",
114 scoped_refptr<ConvertableToTraceFormat>(dump_holder));
117 void TraceEventSystemStatsMonitor::StopProfiling() {
121 bool TraceEventSystemStatsMonitor::IsTimerRunningForTest() const {
122 return dump_timer_.IsRunning();
125 void AppendSystemProfileAsTraceFormat(const SystemMetrics& system_metrics,
126 std::string* output) {
128 base::JSONWriter::Write(system_metrics.ToValue().get(), &tmp);