54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
// Copyright 2019 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MEMORY_DISCARDABLE_MEMORY_INTERNAL_H_
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#define BASE_MEMORY_DISCARDABLE_MEMORY_INTERNAL_H_
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#include "base/base_export.h"
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#include "base/feature_list.h"
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#include "base/metrics/field_trial_params.h"
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#include "build/build_config.h"
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#if BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
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namespace base {
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// Enumeration of the possible experiment groups in the discardable memory
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// backing trial. Note that |kAshmem| and |kEmulatedSharedMemory| both map to
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// discardable shared memory, except the former allows for the use of ashmem for
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// unpinning memory. Ensure that the order of the enum values matches those in
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// |kDiscardableMemoryBackingParamOptions|.
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enum DiscardableMemoryTrialGroup : int {
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kEmulatedSharedMemory = 0,
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kMadvFree,
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// Only Android devices will be assigned to the ashmem group.
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kAshmem,
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};
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namespace features {
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// Feature flag enabling the discardable memory backing trial.
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BASE_EXPORT BASE_DECLARE_FEATURE(kDiscardableMemoryBackingTrial);
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BASE_EXPORT extern const base::FeatureParam<DiscardableMemoryTrialGroup>::Option
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kDiscardableMemoryBackingParamOptions[];
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BASE_EXPORT extern const base::FeatureParam<DiscardableMemoryTrialGroup>
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kDiscardableMemoryBackingParam;
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} // namespace features
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// Whether we should do the discardable memory backing trial for this session.
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BASE_EXPORT bool DiscardableMemoryBackingFieldTrialIsEnabled();
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// If we should do the discardable memory backing trial, then get the trial
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// group this session belongs in.
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BASE_EXPORT DiscardableMemoryTrialGroup
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GetDiscardableMemoryBackingFieldTrialGroup();
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} // namespace base
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#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) ||
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// BUILDFLAG(IS_ANDROID)
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#endif // BASE_MEMORY_DISCARDABLE_MEMORY_INTERNAL_H_
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