sched_policy.c revision 13ed76bfbce8e96604e781f88808b4d883891dde
10384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 2493dad966305a7fb555addd367532dd2af275a27San Mehat/* libs/cutils/sched_policy.c 3493dad966305a7fb555addd367532dd2af275a27San Mehat** 4493dad966305a7fb555addd367532dd2af275a27San Mehat** Copyright 2007, The Android Open Source Project 5493dad966305a7fb555addd367532dd2af275a27San Mehat** 6493dad966305a7fb555addd367532dd2af275a27San Mehat** Licensed under the Apache License, Version 2.0 (the "License"); 7493dad966305a7fb555addd367532dd2af275a27San Mehat** you may not use this file except in compliance with the License. 8493dad966305a7fb555addd367532dd2af275a27San Mehat** You may obtain a copy of the License at 9493dad966305a7fb555addd367532dd2af275a27San Mehat** 10493dad966305a7fb555addd367532dd2af275a27San Mehat** http://www.apache.org/licenses/LICENSE-2.0 11493dad966305a7fb555addd367532dd2af275a27San Mehat** 12493dad966305a7fb555addd367532dd2af275a27San Mehat** Unless required by applicable law or agreed to in writing, software 13493dad966305a7fb555addd367532dd2af275a27San Mehat** distributed under the License is distributed on an "AS IS" BASIS, 14493dad966305a7fb555addd367532dd2af275a27San Mehat** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15493dad966305a7fb555addd367532dd2af275a27San Mehat** See the License for the specific language governing permissions and 16493dad966305a7fb555addd367532dd2af275a27San Mehat** limitations under the License. 17493dad966305a7fb555addd367532dd2af275a27San Mehat*/ 18493dad966305a7fb555addd367532dd2af275a27San Mehat 19bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#define LOG_TAG "SchedPolicy" 20bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 21493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdio.h> 22493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdlib.h> 23493dad966305a7fb555addd367532dd2af275a27San Mehat#include <unistd.h> 24493dad966305a7fb555addd367532dd2af275a27San Mehat#include <string.h> 25493dad966305a7fb555addd367532dd2af275a27San Mehat#include <errno.h> 26493dad966305a7fb555addd367532dd2af275a27San Mehat#include <fcntl.h> 27bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#include <cutils/sched_policy.h> 28bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#include <cutils/log.h> 290384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 30bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged. 31bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown * Call this any place a SchedPolicy is used as an input parameter. 32bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown * Returns the possibly re-mapped policy. 33bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown */ 34bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brownstatic inline SchedPolicy _policy(SchedPolicy p) 35bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 36bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p; 37bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 38d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 39bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#if defined(HAVE_ANDROID_OS) && defined(HAVE_SCHED_H) && defined(HAVE_PTHREADS) 400384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 41493dad966305a7fb555addd367532dd2af275a27San Mehat#include <sched.h> 4286b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#include <pthread.h> 43493dad966305a7fb555addd367532dd2af275a27San Mehat 443cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#ifndef SCHED_NORMAL 453cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat #define SCHED_NORMAL 0 463cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#endif 473cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 483cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#ifndef SCHED_BATCH 493cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat #define SCHED_BATCH 3 503cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#endif 513cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 52805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat#define POLICY_DEBUG 0 53d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 5410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#define CAN_SET_SP_SYSTEM 0 // non-zero means to implement set_sched_policy(tid, SP_SYSTEM) 5510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 56e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 57e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 58c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int __sys_supports_schedgroups = -1; 59c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 60e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. 61e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int bg_cgroup_fd = -1; 6210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int fg_cgroup_fd = -1; 6310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 6410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int system_cgroup_fd = -1; 6510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 6610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int audio_app_cgroup_fd = -1; 6710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int audio_sys_cgroup_fd = -1; 68e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 69e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 70e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int add_tid_to_cgroup(int tid, SchedPolicy policy) 71493dad966305a7fb555addd367532dd2af275a27San Mehat{ 72493dad966305a7fb555addd367532dd2af275a27San Mehat int fd; 73e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 7410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 7510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 76e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick fd = bg_cgroup_fd; 7710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 7810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 7910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = fg_cgroup_fd; 8010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 8110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 8210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 8310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = system_cgroup_fd; 8410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 8510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 8610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_AUDIO_APP: 8710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = audio_app_cgroup_fd; 8810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 8910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_AUDIO_SYS: 9010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = audio_sys_cgroup_fd; 9110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 9210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 9310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = -1; 9410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 95e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 96e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 97e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 9810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGE("add_tid_to_cgroup failed; policy=%d\n", policy); 99493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 100805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 101493dad966305a7fb555addd367532dd2af275a27San Mehat 102253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 103253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 104253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 105253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 106253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 107253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 108253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 109253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 110253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 111253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 112253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 113e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 114e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 115e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 116e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 117e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 118e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 11910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGW("add_tid_to_cgroup failed to write '%s' (%s); policy=%d\n", 12010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten ptr, strerror(errno), policy); 121493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 122493dad966305a7fb555addd367532dd2af275a27San Mehat } 123493dad966305a7fb555addd367532dd2af275a27San Mehat 124493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 125493dad966305a7fb555addd367532dd2af275a27San Mehat} 126493dad966305a7fb555addd367532dd2af275a27San Mehat 127e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 128e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 129e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 130e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 131e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 13210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 133e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 1345b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown system_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 13510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (system_cgroup_fd < 0) { 13610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGV("open of %s failed: %s\n", filename, strerror(errno)); 13710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } 13810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 13910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 14013ed76bfbce8e96604e781f88808b4d883891ddeDima Zavin filename = "/dev/cpuctl/apps/tasks"; 1415b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 14210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 143e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 144e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 145e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 14613ed76bfbce8e96604e781f88808b4d883891ddeDima Zavin filename = "/dev/cpuctl/apps/bg_non_interactive/tasks"; 1475b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 148e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 149e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 150493dad966305a7fb555addd367532dd2af275a27San Mehat } 15110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 15210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten filename = "/dev/cpuctl/audio_app/tasks"; 1535b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown audio_app_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 15410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (audio_app_cgroup_fd < 0) { 15510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGV("open of %s failed: %s\n", filename, strerror(errno)); 15610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } 15710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 15810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten filename = "/dev/cpuctl/audio_sys/tasks"; 1595b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown audio_sys_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 16010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (audio_sys_cgroup_fd < 0) { 16110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGV("open of %s failed: %s\n", filename, strerror(errno)); 16210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } 16310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 164e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 165e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 166493dad966305a7fb555addd367532dd2af275a27San Mehat } 167c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 168c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 169c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 170c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * Try to get the scheduler group. 171c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 172503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 173c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 174503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 175c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 176c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 177c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 178c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 179c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 180c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int getSchedulerGroup(int tid, char* buf, size_t bufLen) 181c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 182c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#ifdef HAVE_ANDROID_OS 183c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 184503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 185503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 186c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 187c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 189c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 190c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 191c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 192503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 193503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *subsys; 195503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 197c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 198503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 200503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 201503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 202c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 203503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(subsys = strsep(&next, ":"))) { 204503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 205503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 206503df2075991cd03ddf43d14e05768a2138b9028San Mehat 207503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (strcmp(subsys, "cpu")) { 208503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 209503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 210503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 211503df2075991cd03ddf43d14e05768a2138b9028San Mehat 212503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 213503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 214503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 215503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 216503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 217503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 218503df2075991cd03ddf43d14e05768a2138b9028San Mehat 219503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 220503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 221503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 222503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 223503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 224503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 225503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 226c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 227c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2287e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Failed to find cpu subsys"); 229503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 230503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 231503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 2327e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 233503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 234503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 235c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 236c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 237c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 238c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 239c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 240c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 241c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 242c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 24369bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#ifdef HAVE_GETTID 24469bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 24569bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 24669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 24769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#endif 248e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 249c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 250c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 251c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 252c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) 253c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 254c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 25510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_SYSTEM; 25613ed76bfbce8e96604e781f88808b4d883891ddeDima Zavin } else if (!strcmp(grpBuf, "apps/bg_non_interactive")) { 257c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 25813ed76bfbce8e96604e781f88808b4d883891ddeDima Zavin } else if (!strcmp(grpBuf, "apps")) { 25910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 26010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } else if (!strcmp(grpBuf, "audio_app")) { 26110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_AUDIO_APP; 26210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } else if (!strcmp(grpBuf, "audio_sys")) { 26310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_AUDIO_SYS; 264c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 265c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 266c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 267c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 268c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 269c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 270c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 271c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 272c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 273c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 274c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 275c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 276c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 277c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 278c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 279c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 280c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 281c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 282c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 283c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 284c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 285c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 28669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#ifdef HAVE_GETTID 28769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 28869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 28969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 29069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#endif 29169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 292e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 293493dad966305a7fb555addd367532dd2af275a27San Mehat 294d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 295d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 296d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 297d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 298d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 299d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 300d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 301d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 302d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 303d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 304d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 305d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 306d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 307d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 308d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 309d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 310d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 311d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 312d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 313d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 314d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 315d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 316d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 31710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 31810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3197e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 32010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 32110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 3227e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 32310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 32410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 32510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 32610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 32710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_AUDIO_APP: 32810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("aaa tid %d (%s)", tid, thread_name); 32910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 33010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_AUDIO_SYS: 33110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("sss tid %d (%s)", tid, thread_name); 33210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 33310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3347e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 33510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 336d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 337d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 338d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 339493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 340e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (add_tid_to_cgroup(tid, policy)) { 341493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 342493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 343493dad966305a7fb555addd367532dd2af275a27San Mehat } 344493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 345493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 346493dad966305a7fb555addd367532dd2af275a27San Mehat 347493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 348493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 349493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 350493dad966305a7fb555addd367532dd2af275a27San Mehat SCHED_BATCH : SCHED_NORMAL, 351493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 352493dad966305a7fb555addd367532dd2af275a27San Mehat } 353493dad966305a7fb555addd367532dd2af275a27San Mehat 354493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 355493dad966305a7fb555addd367532dd2af275a27San Mehat} 3560384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 357bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 358bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 359bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 360bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 361bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brownint set_sched_policy(int tid, SchedPolicy policy) 362bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 363bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 364bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 365bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 366bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brownint get_sched_policy(int tid, SchedPolicy *policy) 367bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 368bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 369bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 370bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 371bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 372bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 373bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 37486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 37586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 37669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 37786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 37886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 37986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 38010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 38110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 38210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 38386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 38486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 38586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 38686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 38786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 38886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 38986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten 390