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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PERFORMANCE_MANAGER_MECHANISMS_WORKING_SET_TRIMMER_H_
#define CHROME_BROWSER_PERFORMANCE_MANAGER_MECHANISMS_WORKING_SET_TRIMMER_H_
#include "base/no_destructor.h"
namespace performance_manager {
class ProcessNode;
namespace mechanism {
// A WorkingSetTrimmer will reduce a ProcessNode's memory footprint by giving a
// hint to the operating system that this processes memory may be reclaimed or
// trimmed.
class WorkingSetTrimmer {
public:
WorkingSetTrimmer(const WorkingSetTrimmer&) = delete;
WorkingSetTrimmer& operator=(const WorkingSetTrimmer&) = delete;
virtual ~WorkingSetTrimmer() = default;
// GetInstance will return the singleton instance of a working set trimmer for
// this platform.
static WorkingSetTrimmer* GetInstance();
// Returns true if the WorkingSetTrimmer is supported on the current platform.
virtual bool PlatformSupportsWorkingSetTrim() = 0;
virtual void TrimWorkingSet(const ProcessNode* process_node) = 0;
protected:
// A WorkingSetTrimmer should never be created directly it should only be
// retrieved via WorkingSetTrimmer::GetInstance().
WorkingSetTrimmer() = default;
private:
friend class base::NoDestructor<WorkingSetTrimmer>;
};
} // namespace mechanism
} // namespace performance_manager
#endif // CHROME_BROWSER_PERFORMANCE_MANAGER_MECHANISMS_WORKING_SET_TRIMMER_H_
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