sched_policy.c revision 4284f9f3a3d471208d7a9341056e4d7af886dab3
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 409b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 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 63919bb66f73c679cf81efc6d2433ad75197891ba6Elliott Hughes#ifdef USE_CPUSETS 64b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray// File descriptors open to /dev/cpuset/../tasks, setup by initialize, or -1 on error 654284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murraystatic int system_bg_cpuset_fd = -1; 66b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int bg_cpuset_fd = -1; 67b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int fg_cpuset_fd = -1; 68ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int bg_schedboost_fd = -1; 69ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int fg_schedboost_fd = -1; 70919bb66f73c679cf81efc6d2433ad75197891ba6Elliott Hughes#endif 71b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 72e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 73b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int add_tid_to_cgroup(int tid, int fd) 74493dad966305a7fb555addd367532dd2af275a27San Mehat{ 75e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 76b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGE("add_tid_to_cgroup failed; fd=%d\n", fd); 77b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 78493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 79805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 80493dad966305a7fb555addd367532dd2af275a27San Mehat 81253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 82253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 83253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 84253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 85253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 86253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 87253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 88253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 89253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 90253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 91253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 92e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 93e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 94e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 95e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 96e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 97e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 98b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGW("add_tid_to_cgroup failed to write '%s' (%s); fd=%d\n", 99b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray ptr, strerror(errno), fd); 100b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 101493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 102493dad966305a7fb555addd367532dd2af275a27San Mehat } 103493dad966305a7fb555addd367532dd2af275a27San Mehat 104493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 105493dad966305a7fb555addd367532dd2af275a27San Mehat} 106493dad966305a7fb555addd367532dd2af275a27San Mehat 107e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 108e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 109e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 110e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 112e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 1135b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 11410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 115e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 116e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 117e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 118522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews filename = "/dev/cpuctl/bg_non_interactive/tasks"; 1195b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 120e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 121e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 122493dad966305a7fb555addd367532dd2af275a27San Mehat } 123e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 124e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 125493dad966305a7fb555addd367532dd2af275a27San Mehat } 126b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 127b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifdef USE_CPUSETS 128b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (!access("/dev/cpuset/tasks", F_OK)) { 129b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 130b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/foreground/tasks"; 131b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 132b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/background/tasks"; 133b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1344284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray filename = "/dev/cpuset/system-background/tasks"; 1354284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray system_bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1364284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray 137ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#ifdef USE_SCHEDBOOST 138ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos filename = "/sys/fs/cgroup/stune/foreground/tasks"; 139ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos fg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 140ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos filename = "/sys/fs/cgroup/stune/tasks"; 141ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos bg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 142ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#endif 143b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 144b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 145c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 146c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 147c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 148c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * Try to get the scheduler group. 149c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 150503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 151c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 152503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 153c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 154c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 155c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 156c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 157c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 158c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int getSchedulerGroup(int tid, char* buf, size_t bufLen) 159c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 1609b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 161c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 162503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 163503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 164c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 165c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 166503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 167c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 168c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 169c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 170503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 171503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 172503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *subsys; 173503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 174503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 175c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 176503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 177503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 179503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 180c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 181503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(subsys = strsep(&next, ":"))) { 182503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 183503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 184503df2075991cd03ddf43d14e05768a2138b9028San Mehat 185503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (strcmp(subsys, "cpu")) { 186503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 187503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 189503df2075991cd03ddf43d14e05768a2138b9028San Mehat 190503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 191503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 192503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 193503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 195503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat 197503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 198503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 200503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 201503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 202503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 203503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 204c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 205c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2067e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Failed to find cpu subsys"); 207503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 208503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 209503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 2107e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 211503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 212503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 213c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 214c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 215c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 216c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 217c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 218c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 219c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 220c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 22169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 22269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 22369bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 224e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 225c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 226c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 227c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 228c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) 229c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 230c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 23110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 232522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews } else if (!strcmp(grpBuf, "bg_non_interactive")) { 233522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews *policy = SP_BACKGROUND; 234c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 235c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 236c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 237c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 238c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 239c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 240c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 241c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 242c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 243c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 244c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 245c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 246c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 247c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 248c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 249c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 250c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 251c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 252c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 253c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 254b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murrayint set_cpuset_policy(int tid, SchedPolicy policy) 255b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray{ 256b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // in the absence of cpusets, use the old sched policy 257b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifndef USE_CPUSETS 258b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return set_sched_policy(tid, policy); 259b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#else 260b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (tid == 0) { 261b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray tid = gettid(); 262b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 263b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray policy = _policy(policy); 264b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray pthread_once(&the_once, __initialize); 265b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 266b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray int fd; 267ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos int boost_fd; 268b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 269b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 270b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cpuset_fd; 271ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = bg_schedboost_fd; 272b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 273b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 274b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 275b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 276b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cpuset_fd; 277ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = fg_schedboost_fd; 2784284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray break; 2794284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray case SP_SYSTEM: 2804284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray fd = system_bg_cpuset_fd; 2814284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray boost_fd = bg_schedboost_fd; 282b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 283b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 284ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = fd = -1; 285b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 286b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 287b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 288b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 289b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (errno != ESRCH && errno != ENOENT) 290b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return -errno; 291b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 292b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 293ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) { 294ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos if (errno != ESRCH && errno != ENOENT) 295ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos return -errno; 296ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos } 297ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos 298999102664c4aa752d7e90c7c5ec5da9e1d648ac9Tim Murray return 0; 299b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 300b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray} 301b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 302c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 303c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 30469bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 30569bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 30669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 30769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 308e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 309493dad966305a7fb555addd367532dd2af275a27San Mehat 310d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 311d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 312d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 313d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 314d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 315d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 316d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 317d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 318d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 319d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 320d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 321d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 322d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 323d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 324d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 325d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 326d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 327d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 328d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 329d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 330d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 331d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 332d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 33310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 33410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3357e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 33610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 33710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 33829319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 33929319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 3407e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 34110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 34210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 34310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 34410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 34510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3467e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 34710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 348d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 349d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 350d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 351493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 352b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray int fd; 353b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 354b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 355b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cgroup_fd; 356b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 357b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 358b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 359b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 360b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cgroup_fd; 361b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 362b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 363b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = -1; 364b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 365b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 366b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 367b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 368b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 369493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 370493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 371493dad966305a7fb555addd367532dd2af275a27San Mehat } 372493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 373493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 374493dad966305a7fb555addd367532dd2af275a27San Mehat 375493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 376493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 377493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 378b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SCHED_BATCH : SCHED_NORMAL, 379493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 380493dad966305a7fb555addd367532dd2af275a27San Mehat } 381493dad966305a7fb555addd367532dd2af275a27San Mehat 3824cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos prctl(PR_SET_TIMERSLACK_PID, 3834cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG, tid); 384422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 385493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 386493dad966305a7fb555addd367532dd2af275a27San Mehat} 3870384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 388bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 389bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 390bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 391bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 39212717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint set_sched_policy(int tid UNUSED, SchedPolicy policy UNUSED) 393bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 394bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 395bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 396bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 39712717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint get_sched_policy(int tid UNUSED, SchedPolicy *policy) 398bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 399bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 400bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 401bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 402bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 403bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 404bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 40586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 40686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 40769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 40886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 40986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 41086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 41110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 41210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 41310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 41486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 41586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 41686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 41786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 41886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 41986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 420