| // Copyright 2015 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. |
| |
| #ifndef CC_BASE_HISTOGRAMS_H_ |
| #define CC_BASE_HISTOGRAMS_H_ |
| |
| #include "base/compiler_specific.h" |
| #include "base/macros.h" |
| #include "base/metrics/histogram_base.h" |
| #include "base/metrics/histogram_macros.h" |
| #include "base/numerics/safe_math.h" |
| #include "base/strings/stringprintf.h" |
| #include "base/time/time.h" |
| #include "base/timer/elapsed_timer.h" |
| #include "cc/base/cc_export.h" |
| |
| namespace cc { |
| |
| // Supplies a client name to be inserted into histogram names. |
| // These are known so far: Renderer, Browser |
| // |
| // We currently assume that there is only one distinct client per process. |
| // Not thread-safe. If called multiple times, warns and skips metrics. |
| CC_EXPORT void SetClientNameForMetrics(const char* client_name); |
| |
| // Returns the client name, for use by applicable cc metrics code. |
| // May return null, in which case no clients, or at least two clients, set the |
| // client name, and these metrics should be omitted. |
| // |
| // This method guarantees that it will never return two distinct non-null |
| // values over the lifetime of the process. |
| const char* GetClientNameForMetrics(); |
| |
| // Emits UMA histogram trackers for time spent as well as area (in pixels) |
| // processed per unit time. Time is measured in microseconds, and work in |
| // pixels per millisecond. Histogram name should include a %s to grab the client |
| // name. |
| // |
| // Usage: |
| // // Outside of a method, perhaps in a namespace. |
| // DEFINE_SCOPED_UMA_HISTOGRAM_AREA_TIMER( |
| // ScopedReticulateSplinesTimer, |
| // "Compositing.%s.ReticulateSplinesUs", |
| // "Compositing.%s.ReticulateSplinesPixelsPerMs"); |
| // |
| // // Inside a method. |
| // ScopedReticulateSplinesTimer timer; |
| // timer.AddArea(some_rect.size().GetArea()); |
| // |
| #define DEFINE_SCOPED_UMA_HISTOGRAM_AREA_TIMER(class_name, time_histogram, \ |
| area_histogram) \ |
| class class_name : public ScopedUMAHistogramAreaTimerBase { \ |
| public: \ |
| ~class_name(); \ |
| }; \ |
| class_name::~class_name() { \ |
| Sample time_sample; \ |
| Sample area_sample; \ |
| const char* client_name = GetClientNameForMetrics(); \ |
| if (client_name && GetHistogramValues(&time_sample, &area_sample)) { \ |
| /* GetClientNameForMetrics only returns one non-null value over */ \ |
| /* the lifetime of the process, so these histogram names are */ \ |
| /* runtime constant. */ \ |
| UMA_HISTOGRAM_COUNTS(base::StringPrintf(time_histogram, client_name), \ |
| time_sample); \ |
| UMA_HISTOGRAM_COUNTS(base::StringPrintf(area_histogram, client_name), \ |
| area_sample); \ |
| } \ |
| } |
| |
| // Version of the above macro for cases which only care about time, not area. |
| #define DEFINE_SCOPED_UMA_HISTOGRAM_TIMER(class_name, time_histogram) \ |
| class class_name : public ScopedUMAHistogramAreaTimerBase { \ |
| public: \ |
| ~class_name(); \ |
| }; \ |
| class_name::~class_name() { \ |
| Sample time_sample; \ |
| Sample area_sample; \ |
| const char* client_name = GetClientNameForMetrics(); \ |
| if (client_name && GetHistogramValues(&time_sample, &area_sample)) { \ |
| DCHECK_EQ(0, area_sample); \ |
| /* GetClientNameForMetrics only returns one non-null value over */ \ |
| /* the lifetime of the process, so these histogram names are */ \ |
| /* runtime constant. */ \ |
| UMA_HISTOGRAM_COUNTS(base::StringPrintf(time_histogram, client_name), \ |
| time_sample); \ |
| } \ |
| } |
| |
| class CC_EXPORT ScopedUMAHistogramAreaTimerBase { |
| public: |
| void AddArea(const base::CheckedNumeric<int>& area) { area_ += area; } |
| void SetArea(const base::CheckedNumeric<int>& area) { area_ = area; } |
| |
| protected: |
| using Sample = base::HistogramBase::Sample; |
| |
| ScopedUMAHistogramAreaTimerBase(); |
| ~ScopedUMAHistogramAreaTimerBase(); |
| |
| // Returns true if histograms should be recorded (i.e. values are valid). |
| bool GetHistogramValues(Sample* time_microseconds, |
| Sample* pixels_per_ms) const; |
| |
| private: |
| static bool GetHistogramValues(base::TimeDelta elapsed, |
| int area, |
| Sample* time_microseconds, |
| Sample* pixels_per_ms); |
| |
| base::ElapsedTimer timer_; |
| base::CheckedNumeric<int> area_; |
| |
| friend class ScopedUMAHistogramAreaTimerBaseTest; |
| DISALLOW_COPY_AND_ASSIGN(ScopedUMAHistogramAreaTimerBase); |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_BASE_HISTOGRAMS_H_ |