sched_policy.c revision 4cdce427f9ba0339ac7c58fdb4f56ac3630abf34
112717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn/* 2493dad966305a7fb555addd367532dd2af275a27San Mehat** Copyright 2007, The Android Open Source Project 3493dad966305a7fb555addd367532dd2af275a27San Mehat** 4b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** Licensed under the Apache License, Version 2.0 (the "License"); 5b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** you may not use this file except in compliance with the License. 6b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** You may obtain a copy of the License at 7493dad966305a7fb555addd367532dd2af275a27San Mehat** 8b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** http://www.apache.org/licenses/LICENSE-2.0 9493dad966305a7fb555addd367532dd2af275a27San Mehat** 10b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** Unless required by applicable law or agreed to in writing, software 11b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** distributed under the License is distributed on an "AS IS" BASIS, 12b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray** See the License for the specific language governing permissions and 14493dad966305a7fb555addd367532dd2af275a27San Mehat** limitations under the License. 15493dad966305a7fb555addd367532dd2af275a27San Mehat*/ 16493dad966305a7fb555addd367532dd2af275a27San Mehat 17bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#define LOG_TAG "SchedPolicy" 18bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 1912717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <errno.h> 2012717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <fcntl.h> 21493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdio.h> 22493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdlib.h> 23493dad966305a7fb555addd367532dd2af275a27San Mehat#include <string.h> 2412717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <unistd.h> 2512717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn 26bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#include <cutils/sched_policy.h> 2712717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <log/log.h> 2812717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn 2912717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#define UNUSED __attribute__((__unused__)) 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 406acf3d7703cbbb7ca0585599aa731996e54bc726Elliott Hughes#if defined(HAVE_ANDROID_OS) 410384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 4286b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#include <pthread.h> 43e07d77e422b328f0b7e8a542e99989dab8c95dacElliott Hughes#include <sched.h> 44e07d77e422b328f0b7e8a542e99989dab8c95dacElliott Hughes#include <sys/prctl.h> 453cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 46805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat#define POLICY_DEBUG 0 47d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 48400c381835b9eed533c67a062d88af5365590f7fElliott Hughes// This prctl is only available in Android kernels. 49400c381835b9eed533c67a062d88af5365590f7fElliott Hughes#define PR_SET_TIMERSLACK_PID 41 50400c381835b9eed533c67a062d88af5365590f7fElliott Hughes 51422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi// timer slack value in nS enforced when the thread moves to background 52422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi#define TIMER_SLACK_BG 40000000 534cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos#define TIMER_SLACK_FG 50000 54422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 55e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 56e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 57c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int __sys_supports_schedgroups = -1; 58c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 59e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. 60e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int bg_cgroup_fd = -1; 6110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int fg_cgroup_fd = -1; 62e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 63b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray// File descriptors open to /dev/cpuset/../tasks, setup by initialize, or -1 on error 64b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int bg_cpuset_fd = -1; 65b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int fg_cpuset_fd = -1; 66b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 67e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 68b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int add_tid_to_cgroup(int tid, int fd) 69493dad966305a7fb555addd367532dd2af275a27San Mehat{ 70e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 71b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGE("add_tid_to_cgroup failed; fd=%d\n", fd); 72b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 73493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 74805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 75493dad966305a7fb555addd367532dd2af275a27San Mehat 76253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 77253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 78253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 79253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 80253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 81253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 82253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 83253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 84253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 85253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 86253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 87e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 88e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 89e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 90e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 91e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 92e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 93b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGW("add_tid_to_cgroup failed to write '%s' (%s); fd=%d\n", 94b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray ptr, strerror(errno), fd); 95b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 96493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 97493dad966305a7fb555addd367532dd2af275a27San Mehat } 98493dad966305a7fb555addd367532dd2af275a27San Mehat 99493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 100493dad966305a7fb555addd367532dd2af275a27San Mehat} 101493dad966305a7fb555addd367532dd2af275a27San Mehat 102e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 103e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 104e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 105e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 106e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 107e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 1085b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 10910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 110e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 112e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 113522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews filename = "/dev/cpuctl/bg_non_interactive/tasks"; 1145b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 115e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 116e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 117493dad966305a7fb555addd367532dd2af275a27San Mehat } 118e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 119e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 120493dad966305a7fb555addd367532dd2af275a27San Mehat } 121b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 122b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifdef USE_CPUSETS 123b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (!access("/dev/cpuset/tasks", F_OK)) { 124b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 125b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/foreground/tasks"; 126b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 127b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/background/tasks"; 128b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 129b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 130b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 131b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 132c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 133c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 134c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 135c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * Try to get the scheduler group. 136c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 137503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 138c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 139503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 140c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 141c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 142c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 143c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 144c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 145c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int getSchedulerGroup(int tid, char* buf, size_t bufLen) 146c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 147c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#ifdef HAVE_ANDROID_OS 148c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 149503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 150503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 151c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 152c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 153503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 154c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 155c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 156c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 157503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 158503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 159503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *subsys; 160503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 161503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 162c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 163503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 164503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 165503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 166503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 167c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 168503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(subsys = strsep(&next, ":"))) { 169503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 170503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 171503df2075991cd03ddf43d14e05768a2138b9028San Mehat 172503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (strcmp(subsys, "cpu")) { 173503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 174503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 175503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 176503df2075991cd03ddf43d14e05768a2138b9028San Mehat 177503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 179503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 180503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 181503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 182503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 183503df2075991cd03ddf43d14e05768a2138b9028San Mehat 184503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 185503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 186503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 187503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 189503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 190503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 191c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 192c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 1937e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Failed to find cpu subsys"); 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 195503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 1977e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 198503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 200c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 201c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 202c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 203c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 204c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 205c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 206c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 207c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 20869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 20969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 21069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 211e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 212c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 213c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 214c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 215c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) 216c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 217c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 21810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 219522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews } else if (!strcmp(grpBuf, "bg_non_interactive")) { 220522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews *policy = SP_BACKGROUND; 221c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 222c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 223c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 224c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 225c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 226c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 227c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 228c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 229c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 230c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 231c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 232c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 233c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 234c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 235c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 236c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 237c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 238c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 239c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 240c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 241b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murrayint set_cpuset_policy(int tid, SchedPolicy policy) 242b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray{ 243b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // in the absence of cpusets, use the old sched policy 244b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifndef USE_CPUSETS 245b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return set_sched_policy(tid, policy); 246b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#else 247b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (tid == 0) { 248b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray tid = gettid(); 249b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 250b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray policy = _policy(policy); 251b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray pthread_once(&the_once, __initialize); 252b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 253b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray int fd; 254b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 255b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 256b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cpuset_fd; 257b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 258b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 259b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 260b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 261b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cpuset_fd; 262b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 263b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 264b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = -1; 265b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 266b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 267b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 268b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 269b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (errno != ESRCH && errno != ENOENT) 270b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return -errno; 271b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 272b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 273b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // we do both setting of cpuset and setting of cgroup 274b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // ensures that backgrounded apps are actually deprioritized 275b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // including on core 0 276b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return set_sched_policy(tid, policy); 277b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 278b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray} 279b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 280c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 281c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 28269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 28369bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 28469bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 28569bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 286e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 287493dad966305a7fb555addd367532dd2af275a27San Mehat 288d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 289d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 290d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 291d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 292d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 293d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 294d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 295d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 296d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 297d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 298d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 299d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 300d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 301d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 302d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 303d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 304d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 305d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 306d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 307d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 308d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 309d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 310d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 31110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 31210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3137e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 31410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 31510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 31629319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 31729319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 3187e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 31910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 32010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 32110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 32210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 32310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3247e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 32510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 326d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 327d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 328d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 329493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 330b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray int fd; 331b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 332b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 333b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cgroup_fd; 334b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 335b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 336b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 337b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 338b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cgroup_fd; 339b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 340b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 341b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = -1; 342b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 343b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 344b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 345b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 346b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 347493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 348493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 349493dad966305a7fb555addd367532dd2af275a27San Mehat } 350493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 351493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 352493dad966305a7fb555addd367532dd2af275a27San Mehat 353493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 354493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 355493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 356b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SCHED_BATCH : SCHED_NORMAL, 357493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 358493dad966305a7fb555addd367532dd2af275a27San Mehat } 359493dad966305a7fb555addd367532dd2af275a27San Mehat 3604cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos prctl(PR_SET_TIMERSLACK_PID, 3614cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG, tid); 362422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 363493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 364493dad966305a7fb555addd367532dd2af275a27San Mehat} 3650384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 366bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 367bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 368bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 369bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 37012717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint set_sched_policy(int tid UNUSED, SchedPolicy policy UNUSED) 371bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 372bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 373bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 374bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 37512717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint get_sched_policy(int tid UNUSED, SchedPolicy *policy) 376bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 377bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 378bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 379bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 380bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 381bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 382bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 38386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 38486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 38569bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 38686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 38786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 38886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 38910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 39010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 39110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 39286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 39386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 39486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 39586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 39686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 39786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 398