sched_policy.c revision 422852ef5c0c2b0b5e031f80f480486df3d185a0
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> 29422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi#include <linux/prctl.h> 300384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 31bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged. 32bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown * Call this any place a SchedPolicy is used as an input parameter. 33bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown * Returns the possibly re-mapped policy. 34bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown */ 35bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brownstatic inline SchedPolicy _policy(SchedPolicy p) 36bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 37bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p; 38bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 39d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 40bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#if defined(HAVE_ANDROID_OS) && defined(HAVE_SCHED_H) && defined(HAVE_PTHREADS) 410384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 42493dad966305a7fb555addd367532dd2af275a27San Mehat#include <sched.h> 4386b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#include <pthread.h> 44493dad966305a7fb555addd367532dd2af275a27San Mehat 453cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#ifndef SCHED_NORMAL 463cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat #define SCHED_NORMAL 0 473cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#endif 483cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 493cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#ifndef SCHED_BATCH 503cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat #define SCHED_BATCH 3 513cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#endif 523cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 53805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat#define POLICY_DEBUG 0 54d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 5510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#define CAN_SET_SP_SYSTEM 0 // non-zero means to implement set_sched_policy(tid, SP_SYSTEM) 5610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 57422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi// timer slack value in nS enforced when the thread moves to background 58422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi#define TIMER_SLACK_BG 40000000 59422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 60e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 61e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 62c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int __sys_supports_schedgroups = -1; 63c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 64e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. 65e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int bg_cgroup_fd = -1; 6610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int fg_cgroup_fd = -1; 6710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 6810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int system_cgroup_fd = -1; 6910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 70e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 71e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 72e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int add_tid_to_cgroup(int tid, SchedPolicy policy) 73493dad966305a7fb555addd367532dd2af275a27San Mehat{ 74493dad966305a7fb555addd367532dd2af275a27San Mehat int fd; 75e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 7610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 7710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 78e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick fd = bg_cgroup_fd; 7910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 8010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 8129319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 8229319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 8310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = fg_cgroup_fd; 8410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 8510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 8610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 8710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = system_cgroup_fd; 8810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 8910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 9010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 9110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = -1; 9210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 93e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 94e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 95e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 9610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGE("add_tid_to_cgroup failed; policy=%d\n", policy); 97493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 98805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 99493dad966305a7fb555addd367532dd2af275a27San Mehat 100253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 101253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 102253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 103253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 104253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 105253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 106253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 107253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 108253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 109253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 110253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 112e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 113e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 114e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 115e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 116e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 11710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGW("add_tid_to_cgroup failed to write '%s' (%s); policy=%d\n", 11810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten ptr, strerror(errno), policy); 119493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 120493dad966305a7fb555addd367532dd2af275a27San Mehat } 121493dad966305a7fb555addd367532dd2af275a27San Mehat 122493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 123493dad966305a7fb555addd367532dd2af275a27San Mehat} 124493dad966305a7fb555addd367532dd2af275a27San Mehat 125e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 126e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 127e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 128e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 129e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 13010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 131e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 1325b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown system_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 13310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (system_cgroup_fd < 0) { 13410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGV("open of %s failed: %s\n", filename, strerror(errno)); 13510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } 13610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 13710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 13813ed76bfbce8e96604e781f88808b4d883891ddeDima Zavin filename = "/dev/cpuctl/apps/tasks"; 1395b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 14010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 141e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 142e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 143e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 14413ed76bfbce8e96604e781f88808b4d883891ddeDima Zavin filename = "/dev/cpuctl/apps/bg_non_interactive/tasks"; 1455b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 146e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 147e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 148493dad966305a7fb555addd367532dd2af275a27San Mehat } 149e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 150e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 151493dad966305a7fb555addd367532dd2af275a27San Mehat } 152c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 153c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 154c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 155c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * Try to get the scheduler group. 156c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 157503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 158c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 159503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 160c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 161c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 162c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 163c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 164c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 165c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int getSchedulerGroup(int tid, char* buf, size_t bufLen) 166c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 167c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#ifdef HAVE_ANDROID_OS 168c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 169503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 170503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 171c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 172c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 173503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 174c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 175c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 176c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 177503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 179503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *subsys; 180503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 181503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 182c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 183503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 184503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 185503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 186503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 187c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(subsys = strsep(&next, ":"))) { 189503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 190503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 191503df2075991cd03ddf43d14e05768a2138b9028San Mehat 192503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (strcmp(subsys, "cpu")) { 193503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 195503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat 197503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 198503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 200503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 201503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 202503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 203503df2075991cd03ddf43d14e05768a2138b9028San Mehat 204503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 205503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 206503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 207503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 208503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 209503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 210503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 211c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 212c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2137e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Failed to find cpu subsys"); 214503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 215503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 216503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 2177e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 218503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 219503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 220c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 221c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 222c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 223c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 224c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 225c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 226c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 227c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 22869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#ifdef HAVE_GETTID 22969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 23069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 23169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 23269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#endif 233e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 234c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 235c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 236c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 237c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) 238c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 239c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 24010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_SYSTEM; 24113ed76bfbce8e96604e781f88808b4d883891ddeDima Zavin } else if (!strcmp(grpBuf, "apps/bg_non_interactive")) { 242c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 24313ed76bfbce8e96604e781f88808b4d883891ddeDima Zavin } else if (!strcmp(grpBuf, "apps")) { 24410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 245c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 246c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 247c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 248c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 249c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 250c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 251c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 252c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 253c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 254c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 255c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 256c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 257c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 258c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 259c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 260c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 261c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 262c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 263c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 264c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 265c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 266c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 26769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#ifdef HAVE_GETTID 26869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 26969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 27069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 27169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#endif 27269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 273e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 274493dad966305a7fb555addd367532dd2af275a27San Mehat 275d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 276d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 277d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 278d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 279d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 280d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 281d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 282d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 283d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 284d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 285d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 286d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 287d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 288d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 289d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 290d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 291d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 292d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 293d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 294d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 295d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 296d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 297d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 29810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 29910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3007e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 30110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 30210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 30329319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 30429319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 3057e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 30610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 30710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 30810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 30910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 31010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3117e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 31210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 313d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 314d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 315d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 316493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 317e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (add_tid_to_cgroup(tid, policy)) { 318493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 319493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 320493dad966305a7fb555addd367532dd2af275a27San Mehat } 321493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 322493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 323493dad966305a7fb555addd367532dd2af275a27San Mehat 324493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 325493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 326493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 327493dad966305a7fb555addd367532dd2af275a27San Mehat SCHED_BATCH : SCHED_NORMAL, 328493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 329493dad966305a7fb555addd367532dd2af275a27San Mehat } 330493dad966305a7fb555addd367532dd2af275a27San Mehat 331422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi prctl(PR_SET_TIMERSLACK_PID, policy == SP_BACKGROUND ? TIMER_SLACK_BG : 0, tid); 332422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 333493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 334493dad966305a7fb555addd367532dd2af275a27San Mehat} 3350384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 336bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 337bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 338bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 339bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 340bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brownint set_sched_policy(int tid, SchedPolicy policy) 341bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 342bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 343bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 344bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 345bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brownint get_sched_policy(int tid, SchedPolicy *policy) 346bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 347bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 348bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 349bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 350bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 351bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 352bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 35386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 35486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 35569bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 35686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 35786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 35886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 35910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 36010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 36110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 36286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 36386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 36486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 36586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 36686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 36786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 36886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten 369