1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.os; 18 19 /** 20 * Binder interface of mmd. 21 * 22 * IMmd is oneway asynchronous API. mmd uses any information passed from outside (e.g. 23 * system_server) as hints. Hint producers don't need to wait until mmd consumes the hists. 24 */ 25 interface IMmd { 26 /** 27 * mmd starts zram maintenance operation (e.g. zram writeback, zram recompression) if 28 * applicable. 29 * 30 * mmd expects this Binder is called on a good timing to execute the maintenance (e.g. while the 31 * system is idle). 32 * 33 * This is oneway asynchronous API. mmd uses any information passed from outside (e.g. 34 * system_server) as hints. Hint producers don't need to wait until mmd consumes the hists. 35 */ doZramMaintenanceAsync()36 oneway void doZramMaintenanceAsync(); 37 38 /** 39 * Whether mmd supports doZramMaintenance() call on the device. 40 * 41 * System, which don't utilize zram, should not call doZramMaintenance() because it is no-op and 42 * useless. 43 */ isZramMaintenanceSupported()44 boolean isZramMaintenanceSupported(); 45 } 46