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// 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/trace_event/trace_event_system_stats_monitor.h"
#include <memory>
#include "base/debug/leak_annotations.h"
#include "base/json/json_writer.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/process/process_metrics.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/threading/thread_local_storage.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/trace_event/trace_event.h"
namespace base {
namespace trace_event {
namespace {
/////////////////////////////////////////////////////////////////////////////
// Holds profiled system stats until the tracing system needs to serialize it.
class SystemStatsHolder : public base::trace_event::ConvertableToTraceFormat {
public:
SystemStatsHolder() { }
~SystemStatsHolder() override {}
// 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::trace_event::ConvertableToTraceFormat overrides:
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() {
std::unique_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,
std::move(dump_holder));
}
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(), &tmp);
*output += tmp;
}
} // namespace trace_event
} // namespace base
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