chromeos/crosapi/mojom/resource_manager.mojom

// Copyright 2021 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.

module crosapi.mojom;

// Memory pressure level corresponding to MemoryPressureLevel in
// base/memory/memory_pressure_listener.h
[Stable, Extensible]
enum MemoryPressureLevel {
  kNone = 0,
  kModerate = 1,
  kCritical = 2,
};

// Memory pressure status.
[Stable]
struct MemoryPressure {
  MemoryPressureLevel level@0;

  // The amount of memory to reclaim to reduce the memory pressure level.
  uint64 reclaim_target_kb@1;
};

// Interface for memory pressure observers. Implemented by lacros-chrome. Used
// by ash-chrome to send memory pressure status.
[Stable, Uuid="51b994bb-278f-4df3-9393-2732f2a0dcb3"]
interface MemoryPressureObserver {
  // Called when memory pressure status changes.
  MemoryPressure@0(MemoryPressure pressure);
};

// Interface to manage chrome resource, e.g. Memory. Implemented by ash-chrome.
[Stable, Uuid="3908db1e-304d-4615-a331-f2f262745bc3"]
interface ResourceManager {
  // Adds an observer for memory pressure status.
  AddMemoryPressureObserver@0(pending_remote<MemoryPressureObserver> observer);
};