1 /* 2 * Copyright (C) 2019 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 #pragma once 18 19 #include <stdbool.h> 20 21 #ifdef __cplusplus 22 extern "C" { 23 #endif 24 25 /* 26 * Check if Linux kernel enables CPUSETS feature. 27 * 28 * Return value: 1 if Linux kernel CONFIG_CPUSETS=y; 0 otherwise. 29 */ 30 extern bool cpusets_enabled(); 31 32 /* 33 * Check if Linux kernel enables SCHEDTUNE feature (only available in Android 34 * common kernel or Linaro LSK, not in mainline Linux as of v4.9) 35 * 36 * Return value: 1 if Linux kernel CONFIG_CGROUP_SCHEDTUNE=y; 0 otherwise. 37 */ 38 extern bool schedboost_enabled(); 39 40 /* Keep in sync with THREAD_GROUP_* in frameworks/base/core/java/android/os/Process.java */ 41 typedef enum { 42 SP_DEFAULT = -1, 43 SP_BACKGROUND = 0, 44 SP_FOREGROUND = 1, 45 SP_SYSTEM = 2, // can't be used with set_sched_policy() 46 SP_AUDIO_APP = 3, 47 SP_AUDIO_SYS = 4, 48 SP_TOP_APP = 5, 49 SP_RT_APP = 6, 50 SP_RESTRICTED = 7, 51 SP_CNT, 52 SP_MAX = SP_CNT - 1, 53 SP_SYSTEM_DEFAULT = SP_FOREGROUND, 54 } SchedPolicy; 55 56 extern int set_cpuset_policy(int tid, SchedPolicy policy); 57 58 /* Assign thread tid to the cgroup associated with the specified policy. 59 * If the thread is a thread group leader, that is it's gettid() == getpid(), 60 * then the other threads in the same thread group are _not_ affected. 61 * On platforms which support gettid(), zero tid means current thread. 62 * Return value: 0 for success, or -errno for error. 63 */ 64 extern int set_sched_policy(int tid, SchedPolicy policy); 65 66 /* Return the policy associated with the cgroup of thread tid via policy pointer. 67 * On platforms which support gettid(), zero tid means current thread. 68 * Return value: 0 for success, or -1 for error and set errno. 69 */ 70 extern int get_sched_policy(int tid, SchedPolicy* policy); 71 72 /* Return a displayable string corresponding to policy. 73 * Return value: non-NULL NUL-terminated name of unspecified length; 74 * the caller is responsible for displaying the useful part of the string. 75 */ 76 extern const char* get_sched_policy_name(SchedPolicy policy); 77 78 #ifdef __cplusplus 79 } 80 #endif 81