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// Copyright 2024 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_BINDINGS_V8_HISTOGRAM_ACCUMULATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_HISTOGRAM_ACCUMULATOR_H_
#include <memory>
#include <mutex>
#include <string>
#include "base/memory/raw_ptr.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace base {
class HistogramBase;
}
namespace blink {
// Computes cumulative values of V8 metrics (e.g., sum of all lazy compile
// times) accumulated over the whole renderer process.
class PLATFORM_EXPORT V8HistogramAccumulator {
public:
static V8HistogramAccumulator* GetInstance();
void* RegisterHistogram(base::HistogramBase* histogram,
const std::string& name);
void AddSample(void* raw_histogram, int sample);
void GenerateDataInteractive();
V8HistogramAccumulator(const V8HistogramAccumulator&) = delete;
V8HistogramAccumulator& operator=(const V8HistogramAccumulator&) = delete;
private:
V8HistogramAccumulator();
~V8HistogramAccumulator() = default;
struct HistogramAndSum {
explicit HistogramAndSum(base::HistogramBase* histogram)
: original_histogram(histogram) {}
HistogramAndSum(base::HistogramBase* histogram,
std::atomic<int>* sum_microseconds)
: original_histogram(histogram), sum_microseconds(sum_microseconds) {}
raw_ptr<base::HistogramBase> original_histogram;
raw_ptr<std::atomic<int>> sum_microseconds = nullptr;
};
void* RegisterHistogramImpl(base::HistogramBase* histogram,
const std::string& name);
void AddSampleImpl(void* raw_histogram, int sample);
void GenerateDataInteractiveImpl();
private:
struct AccumulatingHistograms {
raw_ptr<base::HistogramBase> interactive_histogram;
// TODO(329408826): Add more accumulating points;
};
AccumulatingHistograms compile_foreground_;
AccumulatingHistograms compile_background_;
AccumulatingHistograms execute_;
std::atomic<int> compile_foreground_sum_microseconds_ = 0;
std::atomic<int> compile_background_sum_microseconds_ = 0;
std::atomic<int> execute_sum_microseconds_ = 0;
WTF::Vector<std::unique_ptr<HistogramAndSum>> histogram_and_sums_;
// Protects histogram_and_sums_.
std::mutex histogram_and_sums_mutex_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_HISTOGRAM_ACCUMULATOR_H_
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