Index: base/debug/trace_event_system_stats_monitor.cc |
diff --git a/base/debug/trace_event_system_stats_monitor.cc b/base/debug/trace_event_system_stats_monitor.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..b95e712b6aff3432b78231a819d67a8b5e8eadb6 |
--- /dev/null |
+++ b/base/debug/trace_event_system_stats_monitor.cc |
@@ -0,0 +1,132 @@ |
+// Copyright 2013 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "base/debug/trace_event_system_stats_monitor.h" |
+ |
+#include "base/debug/leak_annotations.h" |
+#include "base/debug/trace_event.h" |
+#include "base/json/json_writer.h" |
+#include "base/lazy_instance.h" |
+#include "base/logging.h" |
+#include "base/memory/scoped_ptr.h" |
+#include "base/strings/string_number_conversions.h" |
+#include "base/strings/string_util.h" |
+#include "base/thread_task_runner_handle.h" |
+#include "base/threading/thread_local_storage.h" |
+ |
+namespace base { |
+namespace debug { |
+ |
+namespace { |
+ |
+///////////////////////////////////////////////////////////////////////////// |
+// Holds profiled system stats until the tracing system needs to serialize it. |
+class SystemStatsHolder : public base::debug::ConvertableToTraceFormat { |
+ public: |
+ SystemStatsHolder() { } |
+ virtual ~SystemStatsHolder() { } |
+ |
+ // Fills system_metrics_ with profiled system memory and disk stats. |
+ // Uses the previous stats to compute rates if this is not the first profile. |
+ void GetSystemProfilingStats(); |
+ |
+ // base::debug::ConvertableToTraceFormat overrides: |
+ virtual void AppendAsTraceFormat(std::string* out) const OVERRIDE { |
+ AppendSystemProfileAsTraceFormat(system_stats_, out); |
+ } |
+ |
+ private: |
+ SystemMetrics system_stats_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(SystemStatsHolder); |
+}; |
+ |
+void SystemStatsHolder::GetSystemProfilingStats() { |
+ system_stats_ = SystemMetrics::Sample(); |
+} |
+ |
+} // namespace |
+ |
+////////////////////////////////////////////////////////////////////////////// |
+ |
+TraceEventSystemStatsMonitor::TraceEventSystemStatsMonitor( |
+ scoped_refptr<SingleThreadTaskRunner> task_runner) |
+ : task_runner_(task_runner), |
+ weak_factory_(this) { |
+ // Force the "system_stats" category to show up in the trace viewer. |
+ TraceLog::GetCategoryGroupEnabled(TRACE_DISABLED_BY_DEFAULT("system_stats")); |
+ |
+ // Allow this to be instantiated on unsupported platforms, but don't run. |
+ TraceLog::GetInstance()->AddEnabledStateObserver(this); |
+} |
+ |
+TraceEventSystemStatsMonitor::~TraceEventSystemStatsMonitor() { |
+ if (dump_timer_.IsRunning()) |
+ StopProfiling(); |
+ TraceLog::GetInstance()->RemoveEnabledStateObserver(this); |
+} |
+ |
+void TraceEventSystemStatsMonitor::OnTraceLogEnabled() { |
+ // Check to see if system tracing is enabled. |
+ bool enabled; |
+ |
+ TRACE_EVENT_CATEGORY_GROUP_ENABLED(TRACE_DISABLED_BY_DEFAULT( |
+ "system_stats"), &enabled); |
+ if (!enabled) |
+ return; |
+ task_runner_->PostTask( |
+ FROM_HERE, |
+ base::Bind(&TraceEventSystemStatsMonitor::StartProfiling, |
+ weak_factory_.GetWeakPtr())); |
+} |
+ |
+void TraceEventSystemStatsMonitor::OnTraceLogDisabled() { |
+ task_runner_->PostTask( |
+ FROM_HERE, |
+ base::Bind(&TraceEventSystemStatsMonitor::StopProfiling, |
+ weak_factory_.GetWeakPtr())); |
+} |
+ |
+void TraceEventSystemStatsMonitor::StartProfiling() { |
+ // Watch for the tracing framework sending enabling more than once. |
+ if (dump_timer_.IsRunning()) |
+ return; |
+ |
+ dump_timer_.Start(FROM_HERE, |
+ TimeDelta::FromMilliseconds(TraceEventSystemStatsMonitor:: |
+ kSamplingIntervalMilliseconds), |
+ base::Bind(&TraceEventSystemStatsMonitor:: |
+ DumpSystemStats, |
+ weak_factory_.GetWeakPtr())); |
+} |
+ |
+// If system tracing is enabled, dumps a profile to the tracing system. |
+void TraceEventSystemStatsMonitor::DumpSystemStats() { |
+ scoped_ptr<SystemStatsHolder> dump_holder(new SystemStatsHolder()); |
+ dump_holder->GetSystemProfilingStats(); |
+ |
+ TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID( |
+ TRACE_DISABLED_BY_DEFAULT("system_stats"), |
+ "base::TraceEventSystemStatsMonitor::SystemStats", |
+ this, |
+ dump_holder.PassAs<base::debug::ConvertableToTraceFormat>()); |
+} |
+ |
+void TraceEventSystemStatsMonitor::StopProfiling() { |
+ dump_timer_.Stop(); |
+} |
+ |
+bool TraceEventSystemStatsMonitor::IsTimerRunningForTest() const { |
+ return dump_timer_.IsRunning(); |
+} |
+ |
+void AppendSystemProfileAsTraceFormat(const SystemMetrics& system_metrics, |
+ std::string* output) { |
+ std::string tmp; |
+ base::JSONWriter::Write(system_metrics.ToValue().get(), &tmp); |
+ *output += tmp; |
+} |
+ |
+} // namespace debug |
+} // namespace base |