1 /* 2 * Copyright (C) 2007 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 #ifndef __CUTILS_SCHED_POLICY_H 18 #define __CUTILS_SCHED_POLICY_H 19 20 #include <stdbool.h> 21 22 #ifdef __cplusplus 23 extern "C" { 24 #endif 25 26 /* 27 * Check if Linux kernel enables CPUSETS feature. 28 * 29 * Return value: 1 if Linux kernel CONFIG_CPUSETS=y; 0 otherwise. 30 */ 31 extern bool cpusets_enabled(); 32 33 /* 34 * Check if Linux kernel enables SCHEDTUNE feature (only available in Android 35 * common kernel or Linaro LSK, not in mainline Linux as of v4.9) 36 * 37 * Return value: 1 if Linux kernel CONFIG_SCHEDTUNE=y; 0 otherwise. 38 */ 39 extern bool schedboost_enabled(); 40 41 /* Keep in sync with THREAD_GROUP_* in frameworks/base/core/java/android/os/Process.java */ 42 typedef enum { 43 SP_DEFAULT = -1, 44 SP_BACKGROUND = 0, 45 SP_FOREGROUND = 1, 46 SP_SYSTEM = 2, // can't be used with set_sched_policy() 47 SP_AUDIO_APP = 3, 48 SP_AUDIO_SYS = 4, 49 SP_TOP_APP = 5, 50 SP_CNT, 51 SP_MAX = SP_CNT - 1, 52 SP_SYSTEM_DEFAULT = SP_FOREGROUND, 53 } SchedPolicy; 54 55 extern int set_cpuset_policy(int tid, SchedPolicy policy); 56 57 /* Assign thread tid to the cgroup associated with the specified policy. 58 * If the thread is a thread group leader, that is it's gettid() == getpid(), 59 * then the other threads in the same thread group are _not_ affected. 60 * On platforms which support gettid(), zero tid means current thread. 61 * Return value: 0 for success, or -errno for error. 62 */ 63 extern int set_sched_policy(int tid, SchedPolicy policy); 64 65 /* Return the policy associated with the cgroup of thread tid via policy pointer. 66 * On platforms which support gettid(), zero tid means current thread. 67 * Return value: 0 for success, or -1 for error and set errno. 68 */ 69 extern int get_sched_policy(int tid, SchedPolicy *policy); 70 71 /* Return a displayable string corresponding to policy. 72 * Return value: non-NULL NUL-terminated name of unspecified length; 73 * the caller is responsible for displaying the useful part of the string. 74 */ 75 extern const char *get_sched_policy_name(SchedPolicy policy); 76 77 #ifdef __cplusplus 78 } 79 #endif 80 81 #endif /* __CUTILS_SCHED_POLICY_H */ 82