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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_INSTRUMENTATION_HISTOGRAM_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_INSTRUMENTATION_HISTOGRAM_H_
#include <stdint.h>
#include "base/memory/raw_ptr.h"
#include "base/memory/raw_ref.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_macros.h"
#include "base/time/default_tick_clock.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace base {
class HistogramBase;
}
namespace blink {
class PLATFORM_EXPORT CustomCountHistogram {
USING_FAST_MALLOC(CustomCountHistogram);
public:
// Min values should be >=1 as emitted 0s still go into the underflow bucket.
CustomCountHistogram(const char* name,
base::HistogramBase::Sample32 min,
base::HistogramBase::Sample32 max,
int32_t bucket_count);
void Count(base::HistogramBase::Sample32);
void CountMany(base::HistogramBase::Sample32, int count);
void CountMicroseconds(base::TimeDelta);
protected:
explicit CustomCountHistogram(base::HistogramBase*);
raw_ptr<base::HistogramBase> histogram_;
};
template <typename Derived>
class ScopedUsHistogramTimerBase {
USING_FAST_MALLOC(ScopedUsHistogramTimerBase);
public:
explicit ScopedUsHistogramTimerBase(CustomCountHistogram& counter)
: ScopedUsHistogramTimerBase(counter,
base::DefaultTickClock::GetInstance()) {}
ScopedUsHistogramTimerBase(CustomCountHistogram& counter,
const base::TickClock* clock)
: clock_(*clock), start_time_(clock_->NowTicks()), counter_(counter) {}
~ScopedUsHistogramTimerBase() {
if (Derived::ShouldRecord())
counter_->CountMicroseconds(clock_->NowTicks() - start_time_);
}
private:
const raw_ref<const base::TickClock> clock_;
base::TimeTicks start_time_;
const raw_ref<CustomCountHistogram> counter_;
};
class ScopedUsHistogramTimer
: public ScopedUsHistogramTimerBase<ScopedUsHistogramTimer> {
public:
using ScopedUsHistogramTimerBase::ScopedUsHistogramTimerBase;
static bool ShouldRecord() { return true; }
};
class ScopedHighResUsHistogramTimer
: public ScopedUsHistogramTimerBase<ScopedHighResUsHistogramTimer> {
public:
using ScopedUsHistogramTimerBase::ScopedUsHistogramTimerBase;
static bool ShouldRecord() { return base::TimeTicks::IsHighResolution(); }
};
static constexpr base::HistogramBase::Sample32 kTimeBasedHistogramMinSample = 1;
static constexpr base::HistogramBase::Sample32 kTimeBasedHistogramMaxSample =
static_cast<base::Histogram::Sample32>(base::Seconds(10).InMicroseconds());
static constexpr int32_t kTimeBasedHistogramBucketCount = 50;
#define SCOPED_BLINK_UMA_HISTOGRAM_TIMER_IMPL(name, allow_cross_thread) \
DEFINE_STATIC_LOCAL_IMPL( \
CustomCountHistogram, scoped_us_counter, \
(name, kTimeBasedHistogramMinSample, kTimeBasedHistogramMaxSample, \
kTimeBasedHistogramBucketCount), \
allow_cross_thread); \
ScopedUsHistogramTimer timer(scoped_us_counter);
#define SCOPED_BLINK_UMA_HISTOGRAM_TIMER_HIGHRES_IMPL(name, \
allow_cross_thread) \
DEFINE_STATIC_LOCAL_IMPL(CustomCountHistogram, scoped_us_counter, \
(name, 0, 10000000, 50), allow_cross_thread); \
ScopedHighResUsHistogramTimer timer(scoped_us_counter);
// Use code like this to record time, in microseconds, to execute a block of
// code:
//
// {
// SCOPED_BLINK_UMA_HISTOGRAM_TIMER(myUmaStatName)
// RunMyCode();
// }
// This macro records all times between 0us and 10 seconds.
// Do not change this macro without renaming all metrics that use it!
#define SCOPED_BLINK_UMA_HISTOGRAM_TIMER(name) \
SCOPED_BLINK_UMA_HISTOGRAM_TIMER_IMPL(name, false)
// Only record samples when we have a high resolution timer
#define SCOPED_BLINK_UMA_HISTOGRAM_TIMER_HIGHRES(name) \
SCOPED_BLINK_UMA_HISTOGRAM_TIMER_HIGHRES_IMPL(name, false)
// Thread-safe variant of SCOPED_BLINK_UMA_HISTOGRAM_TIMER.
// Use if the histogram can be accessed by multiple threads.
#define SCOPED_BLINK_UMA_HISTOGRAM_TIMER_THREAD_SAFE(name) \
SCOPED_BLINK_UMA_HISTOGRAM_TIMER_IMPL(name, true)
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_INSTRUMENTATION_HISTOGRAM_H_
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