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| 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. |
| 4 |
| 5 #include "base/debug/trace_event_system_stats_monitor.h" |
| 6 |
| 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" |
| 17 |
| 18 namespace base { |
| 19 namespace debug { |
| 20 |
| 21 namespace { |
| 22 |
| 23 ///////////////////////////////////////////////////////////////////////////// |
| 24 // Holds profiled system stats until the tracing system needs to serialize it. |
| 25 class SystemStatsHolder : public base::debug::ConvertableToTraceFormat { |
| 26 public: |
| 27 SystemStatsHolder() { } |
| 28 virtual ~SystemStatsHolder() { } |
| 29 |
| 30 // Fills system_metrics_ with profiled system memory and disk stats. |
| 31 // Uses the previous stats to compute rates if this is not the first profile. |
| 32 void GetSystemProfilingStats(); |
| 33 |
| 34 // base::debug::ConvertableToTraceFormat overrides: |
| 35 virtual void AppendAsTraceFormat(std::string* out) const OVERRIDE { |
| 36 AppendSystemProfileAsTraceFormat(system_stats_, out); |
| 37 } |
| 38 |
| 39 private: |
| 40 SystemMetrics system_stats_; |
| 41 |
| 42 DISALLOW_COPY_AND_ASSIGN(SystemStatsHolder); |
| 43 }; |
| 44 |
| 45 void SystemStatsHolder::GetSystemProfilingStats() { |
| 46 system_stats_ = SystemMetrics::Sample(); |
| 47 } |
| 48 |
| 49 } // namespace |
| 50 |
| 51 ////////////////////////////////////////////////////////////////////////////// |
| 52 |
| 53 TraceEventSystemStatsMonitor::TraceEventSystemStatsMonitor( |
| 54 scoped_refptr<SingleThreadTaskRunner> task_runner) |
| 55 : task_runner_(task_runner), |
| 56 weak_factory_(this) { |
| 57 // Force the "system_stats" category to show up in the trace viewer. |
| 58 TraceLog::GetCategoryGroupEnabled(TRACE_DISABLED_BY_DEFAULT("system_stats")); |
| 59 |
| 60 // Allow this to be instantiated on unsupported platforms, but don't run. |
| 61 TraceLog::GetInstance()->AddEnabledStateObserver(this); |
| 62 } |
| 63 |
| 64 TraceEventSystemStatsMonitor::~TraceEventSystemStatsMonitor() { |
| 65 if (dump_timer_.IsRunning()) |
| 66 StopProfiling(); |
| 67 TraceLog::GetInstance()->RemoveEnabledStateObserver(this); |
| 68 } |
| 69 |
| 70 void TraceEventSystemStatsMonitor::OnTraceLogEnabled() { |
| 71 // Check to see if system tracing is enabled. |
| 72 bool enabled; |
| 73 |
| 74 TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT( |
| 75 "system_stats"), &enabled); |
| 76 if (!enabled) |
| 77 return; |
| 78 task_runner_->PostTask( |
| 79 FROM_HERE, |
| 80 base::Bind(&TraceEventSystemStatsMonitor::StartProfiling, |
| 81 weak_factory_.GetWeakPtr())); |
| 82 } |
| 83 |
| 84 void TraceEventSystemStatsMonitor::OnTraceLogDisabled() { |
| 85 task_runner_->PostTask( |
| 86 FROM_HERE, |
| 87 base::Bind(&TraceEventSystemStatsMonitor::StopProfiling, |
| 88 weak_factory_.GetWeakPtr())); |
| 89 } |
| 90 |
| 91 void TraceEventSystemStatsMonitor::StartProfiling() { |
| 92 // Watch for the tracing framework sending enabling more than once. |
| 93 if (dump_timer_.IsRunning()) |
| 94 return; |
| 95 |
| 96 dump_timer_.Start(FROM_HERE, |
| 97 TimeDelta::FromMilliseconds(TraceEventSystemStatsMonitor:: |
| 98 kSamplingIntervalMilliseconds), |
| 99 base::Bind(&TraceEventSystemStatsMonitor:: |
| 100 DumpSystemStats, |
| 101 weak_factory_.GetWeakPtr())); |
| 102 } |
| 103 |
| 104 // If system tracing is enabled, dumps a profile to the tracing system. |
| 105 void TraceEventSystemStatsMonitor::DumpSystemStats() { |
| 106 scoped_ptr<SystemStatsHolder> dump_holder(new SystemStatsHolder()); |
| 107 dump_holder->GetSystemProfilingStats(); |
| 108 |
| 109 TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID( |
| 110 TRACE_DISABLED_BY_DEFAULT("system_stats"), |
| 111 "base::TraceEventSystemStatsMonitor::SystemStats", |
| 112 this, |
| 113 dump_holder.PassAs<base::debug::ConvertableToTraceFormat>()); |
| 114 } |
| 115 |
| 116 void TraceEventSystemStatsMonitor::StopProfiling() { |
| 117 dump_timer_.Stop(); |
| 118 } |
| 119 |
| 120 bool TraceEventSystemStatsMonitor::IsTimerRunningForTest() const { |
| 121 return dump_timer_.IsRunning(); |
| 122 } |
| 123 |
| 124 void AppendSystemProfileAsTraceFormat(const SystemMetrics& system_metrics, |
| 125 std::string* output) { |
| 126 std::string tmp; |
| 127 base::JSONWriter::Write(system_metrics.ToValue().get(), &tmp); |
| 128 *output += tmp; |
| 129 } |
| 130 |
| 131 } // namespace debug |
| 132 } // namespace base |
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