sched_policy.cpp revision 10ec3c7645bfdb70518dc1b21df40ad5478589e3
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 19493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdio.h> 20493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdlib.h> 21493dad966305a7fb555addd367532dd2af275a27San Mehat#include <unistd.h> 22493dad966305a7fb555addd367532dd2af275a27San Mehat#include <string.h> 23493dad966305a7fb555addd367532dd2af275a27San Mehat#include <errno.h> 24493dad966305a7fb555addd367532dd2af275a27San Mehat#include <fcntl.h> 250384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 26d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#define LOG_TAG "SchedPolicy" 27d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#include "cutils/log.h" 28d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 290384a98d6f61fa47ffde01c15e552f738e88fb94Raphael#ifdef HAVE_SCHED_H 3086b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#ifdef HAVE_PTHREADS 310384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 32493dad966305a7fb555addd367532dd2af275a27San Mehat#include <sched.h> 3386b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#include <pthread.h> 34493dad966305a7fb555addd367532dd2af275a27San Mehat 35493dad966305a7fb555addd367532dd2af275a27San Mehat#include <cutils/sched_policy.h> 36493dad966305a7fb555addd367532dd2af275a27San Mehat 373cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#ifndef SCHED_NORMAL 383cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat #define SCHED_NORMAL 0 393cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#endif 403cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 413cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#ifndef SCHED_BATCH 423cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat #define SCHED_BATCH 3 433cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#endif 443cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 45805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat#define POLICY_DEBUG 0 46d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 4710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#define CAN_SET_SP_SYSTEM 0 // non-zero means to implement set_sched_policy(tid, SP_SYSTEM) 4810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 49e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 50e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 51c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int __sys_supports_schedgroups = -1; 52c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 53e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. 54e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int bg_cgroup_fd = -1; 5510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int fg_cgroup_fd = -1; 5610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 5710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int system_cgroup_fd = -1; 5810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 5910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int audio_app_cgroup_fd = -1; 6010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int audio_sys_cgroup_fd = -1; 61e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 62e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 63e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int add_tid_to_cgroup(int tid, SchedPolicy policy) 64493dad966305a7fb555addd367532dd2af275a27San Mehat{ 65493dad966305a7fb555addd367532dd2af275a27San Mehat int fd; 66e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 6710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 6810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 69e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick fd = bg_cgroup_fd; 7010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 7110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 7210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = fg_cgroup_fd; 7310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 7410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 7510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 7610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = system_cgroup_fd; 7710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 7810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 7910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_AUDIO_APP: 8010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = audio_app_cgroup_fd; 8110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 8210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_AUDIO_SYS: 8310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = audio_sys_cgroup_fd; 8410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 8510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 8610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = -1; 8710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 88e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 89e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 90e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 9110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGE("add_tid_to_cgroup failed; policy=%d\n", policy); 92493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 93805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 94493dad966305a7fb555addd367532dd2af275a27San Mehat 95253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 96253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 97253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 98253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 99253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 100253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 101253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 102253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 103253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 104253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 105253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 106e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 107e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 108e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 109e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 110e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 11210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGW("add_tid_to_cgroup failed to write '%s' (%s); policy=%d\n", 11310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten ptr, strerror(errno), policy); 114493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 115493dad966305a7fb555addd367532dd2af275a27San Mehat } 116493dad966305a7fb555addd367532dd2af275a27San Mehat 117493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 118493dad966305a7fb555addd367532dd2af275a27San Mehat} 119493dad966305a7fb555addd367532dd2af275a27San Mehat 120e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 121e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 122e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 123e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 124e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 12510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#if CAN_SET_SP_SYSTEM 126e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 12710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten system_cgroup_fd = open(filename, O_WRONLY); 12810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (system_cgroup_fd < 0) { 12910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGV("open of %s failed: %s\n", filename, strerror(errno)); 13010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } 13110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten#endif 13210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 13310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten filename = "/dev/cpuctl/foreground/tasks"; 13410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fg_cgroup_fd = open(filename, O_WRONLY); 13510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 136e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 137e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 138e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 139e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/bg_non_interactive/tasks"; 140e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick bg_cgroup_fd = open(filename, O_WRONLY); 141e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 142e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 143493dad966305a7fb555addd367532dd2af275a27San Mehat } 14410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 14510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten filename = "/dev/cpuctl/audio_app/tasks"; 14610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten audio_app_cgroup_fd = open(filename, O_WRONLY); 14710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (audio_app_cgroup_fd < 0) { 14810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGV("open of %s failed: %s\n", filename, strerror(errno)); 14910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } 15010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 15110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten filename = "/dev/cpuctl/audio_sys/tasks"; 15210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten audio_sys_cgroup_fd = open(filename, O_WRONLY); 15310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (audio_sys_cgroup_fd < 0) { 15410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGV("open of %s failed: %s\n", filename, strerror(errno)); 15510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } 15610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten 157e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 158e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 159493dad966305a7fb555addd367532dd2af275a27San Mehat } 160c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 161c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 162c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 163c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * Try to get the scheduler group. 164c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 165503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 166c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 167503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 168c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 169c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 170c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 171c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 172c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 173c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int getSchedulerGroup(int tid, char* buf, size_t bufLen) 174c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 175c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#ifdef HAVE_ANDROID_OS 176c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 177503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 179c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 180c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 181503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 182c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 183c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 184c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 185503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 186503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 187503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *subsys; 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 189503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 190c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 191503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 192503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 193503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 195c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(subsys = strsep(&next, ":"))) { 197503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 198503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat 200503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (strcmp(subsys, "cpu")) { 201503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 202503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 203503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 204503df2075991cd03ddf43d14e05768a2138b9028San Mehat 205503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 206503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 207503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 208503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 209503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 210503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 211503df2075991cd03ddf43d14e05768a2138b9028San Mehat 212503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 213503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 214503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 215503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 216503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 217503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 218503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 219c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 220c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2217e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Failed to find cpu subsys"); 222503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 223503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 224503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 2257e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 226503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 227503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 228c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 229c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 230c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 231c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 232c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 233c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 234c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 235c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 23669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#ifdef HAVE_GETTID 23769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 23869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 23969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 24069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#endif 241e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 242c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 243c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 244c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 245c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) 246c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 247c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 24810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_SYSTEM; 249c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else if (!strcmp(grpBuf, "bg_non_interactive")) { 250c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 25110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } else if (!strcmp(grpBuf, "foreground")) { 25210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 25310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } else if (!strcmp(grpBuf, "audio_app")) { 25410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_AUDIO_APP; 25510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten } else if (!strcmp(grpBuf, "audio_sys")) { 25610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_AUDIO_SYS; 257c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 258c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 259c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 260c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 261c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 262c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 263c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 264c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 265c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 266c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 267c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 268c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 269c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 270c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 271c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 272c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 273c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 274c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 275c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 276c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 27769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten/* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged. 27869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten * Call this any place a SchedPolicy is used as an input parameter. 27969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten * Returns the possibly re-mapped policy. 28069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten */ 28169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kastenstatic inline SchedPolicy _policy(SchedPolicy p) 28269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten{ 28369bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p; 28469bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten} 28569bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten 286c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 287c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 28869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#ifdef HAVE_GETTID 28969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 29069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 29169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 29269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten#endif 29369bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 294e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 295493dad966305a7fb555addd367532dd2af275a27San Mehat 296d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 297d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 298d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 299d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 300d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 301d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 302d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 303d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 304d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 305d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 306d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 307d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 308d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 309d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 310d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 311d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 312d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 313d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 314d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 315d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 316d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 317d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 318d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 31910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 32010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3217e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 32210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 32310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 3247e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 32510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 32610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 32710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 32810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 32910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_AUDIO_APP: 33010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("aaa tid %d (%s)", tid, thread_name); 33110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 33210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_AUDIO_SYS: 33310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("sss tid %d (%s)", tid, thread_name); 33410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 33510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3367e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 33710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 338d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 339d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 340d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 341493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 342e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (add_tid_to_cgroup(tid, policy)) { 343493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 344493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 345493dad966305a7fb555addd367532dd2af275a27San Mehat } 346493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 347493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 348493dad966305a7fb555addd367532dd2af275a27San Mehat 349493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 350493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 351493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 352493dad966305a7fb555addd367532dd2af275a27San Mehat SCHED_BATCH : SCHED_NORMAL, 353493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 354493dad966305a7fb555addd367532dd2af275a27San Mehat } 355493dad966305a7fb555addd367532dd2af275a27San Mehat 356493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 357493dad966305a7fb555addd367532dd2af275a27San Mehat} 3580384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 35986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 36086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 36169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 36286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 36386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 36486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 36510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 36610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 36710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 36886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 36986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 37086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 37186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 37286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 37386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 37486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten 37586b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#endif /* HAVE_PTHREADS */ 3760384a98d6f61fa47ffde01c15e552f738e88fb94Raphael#endif /* HAVE_SCHED_H */ 377