chromium/base/cpu_reduction_experiment.cc

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/cpu_reduction_experiment.h"

#include <atomic>

#include "base/check.h"
#include "base/dcheck_is_on.h"
#include "base/feature_list.h"
#include "base/rand_util.h"

namespace base {

namespace {

// Whether to enable a series of optimizations that reduce total CPU
// utilization.
BASE_FEATURE(…);

class CpuReductionExperimentSubSampler { … };

// Singleton instance of CpuReductionExperimentSubSampler. This is only set when
// the ReduceCpuUtilization experiment is enabled -- as a result, it's ok to
// assume that the experiment is disabled when this is not set.
CpuReductionExperimentSubSampler* g_subsampler = …;

#if DCHECK_IS_ON()
// Atomic to support concurrent writes from IsRunningCpuReductionExperiment().
std::atomic_bool g_accessed_subsampler = …;
#endif

}  // namespace

bool IsRunningCpuReductionExperiment() { … }

void InitializeCpuReductionExperiment() { … }

bool ShouldLogHistogramForCpuReductionExperiment() { … }

}  // namespace base