sched_policy.cpp revision 38d2567c9ffa089661e784b63a5448f8a16572c8
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 178e9aeb9053695a14539653093937158d15385ca6Elliott Hughes#include <cutils/sched_policy.h> 188e9aeb9053695a14539653093937158d15385ca6Elliott Hughes 19bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#define LOG_TAG "SchedPolicy" 20bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 2112717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <errno.h> 2212717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <fcntl.h> 23493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdio.h> 24493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdlib.h> 25493dad966305a7fb555addd367532dd2af275a27San Mehat#include <string.h> 2612717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn#include <unistd.h> 2712717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn 28cfd5b080af8de527d768f0ff7902c26af8d49307Mark Salyzyn#include <log/log.h> 2912717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn 30bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged. 31bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown * Call this any place a SchedPolicy is used as an input parameter. 32bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown * Returns the possibly re-mapped policy. 33bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown */ 34bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brownstatic inline SchedPolicy _policy(SchedPolicy p) 35bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 36bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p; 37bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 38d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 399b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 400384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 4186b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#include <pthread.h> 42e07d77e422b328f0b7e8a542e99989dab8c95dacElliott Hughes#include <sched.h> 43e07d77e422b328f0b7e8a542e99989dab8c95dacElliott Hughes#include <sys/prctl.h> 443cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 45805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat#define POLICY_DEBUG 0 46d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 47422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi// timer slack value in nS enforced when the thread moves to background 48422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi#define TIMER_SLACK_BG 40000000 494cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos#define TIMER_SLACK_FG 50000 50422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 51e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 52e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 532e336b1da1ed66e943089c812f7697f5de450936John Reckstatic int __sys_supports_timerslack = -1; 54c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 55b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray// File descriptors open to /dev/cpuset/../tasks, setup by initialize, or -1 on error 564284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murraystatic int system_bg_cpuset_fd = -1; 57b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int bg_cpuset_fd = -1; 58b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int fg_cpuset_fd = -1; 596647bb51301ea101b73e7431888f70bb35a4fabbTim Murraystatic int ta_cpuset_fd = -1; // special cpuset for top app 60aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray 61aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray// File descriptors open to /dev/stune/../tasks, setup by initialize, or -1 on error 62ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int bg_schedboost_fd = -1; 63ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int fg_schedboost_fd = -1; 64955694b657012c50312de99e6f78084beae52d60Tim Murraystatic int ta_schedboost_fd = -1; 6588ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandesstatic int rt_schedboost_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 102795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen/* 103795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen If CONFIG_CPUSETS for Linux kernel is set, "tasks" can be found under 104795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen /dev/cpuset mounted in init.rc; otherwise, that file does not exist 105795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen even though the directory, /dev/cpuset, is still created (by init.rc). 106795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 107795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen A couple of other candidates (under cpuset mount directory): 108795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen notify_on_release 109795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen release_agent 110795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 111795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen Yet another way to decide if cpuset is enabled is to parse 112795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen /proc/self/status and search for lines begin with "Mems_allowed". 113795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 114795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen If CONFIG_PROC_PID_CPUSET is set, the existence "/proc/self/cpuset" can 115795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen be used to decide if CONFIG_CPUSETS is set, so we don't have a dependency 116795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen on where init.rc mounts cpuset. That's why we'd better require this 117795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen configuration be set if CONFIG_CPUSETS is set. 118795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 11976a934a459138ddfe8e0985e7cc2d0aba6749c42Elliott Hughes In older releases, this was controlled by build-time configuration. 120795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen */ 121795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chenbool cpusets_enabled() { 122795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen static bool enabled = (access("/dev/cpuset/tasks", F_OK) == 0); 123795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 124795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen return enabled; 125795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen} 126795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 127795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen/* 128795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen Similar to CONFIG_CPUSETS above, but with a different configuration 1292d998ea99bd650aafc270f5d0599fc0b8d2c0ce7Alex Naidis CONFIG_CGROUP_SCHEDTUNE that's in Android common Linux kernel and Linaro 130795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen Stable Kernel (LSK), but not in mainline Linux as of v4.9. 131795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 1325dc7736f601849fb76e00edadeb6b6a142b7a322Elliott Hughes In older releases, this was controlled by build-time configuration. 133795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen */ 134795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chenbool schedboost_enabled() { 135795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen static bool enabled = (access("/dev/stune/tasks", F_OK) == 0); 136795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 137795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen return enabled; 138795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen} 139795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 140795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chenstatic void __initialize() { 141795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen const char* filename; 142b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 143795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen if (cpusets_enabled()) { 144795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen if (!access("/dev/cpuset/tasks", W_OK)) { 145795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 146795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen filename = "/dev/cpuset/foreground/tasks"; 147795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 148795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen filename = "/dev/cpuset/background/tasks"; 149795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 150795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen filename = "/dev/cpuset/system-background/tasks"; 151795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen system_bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 152795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen filename = "/dev/cpuset/top-app/tasks"; 153795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen ta_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 154795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 155795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen if (schedboost_enabled()) { 156795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen filename = "/dev/stune/top-app/tasks"; 157795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen ta_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 158795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen filename = "/dev/stune/foreground/tasks"; 159795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen fg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 160795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen filename = "/dev/stune/background/tasks"; 161795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen bg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 16288ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes filename = "/dev/stune/rt/tasks"; 16388ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes rt_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 164795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen } 165795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen } 166b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 1672e336b1da1ed66e943089c812f7697f5de450936John Reck 1682e336b1da1ed66e943089c812f7697f5de450936John Reck char buf[64]; 1692e336b1da1ed66e943089c812f7697f5de450936John Reck snprintf(buf, sizeof(buf), "/proc/%d/timerslack_ns", getpid()); 1702e336b1da1ed66e943089c812f7697f5de450936John Reck __sys_supports_timerslack = !access(buf, W_OK); 171c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 172c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 173c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 1747b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen * Returns the path under the requested cgroup subsystem (if it exists) 175c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 176503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 177c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 179c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 180c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 181c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 182c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 183c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 1847b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenenstatic int getCGroupSubsys(int tid, const char* subsys, char* buf, size_t bufLen) 185c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 1869b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 187c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 189503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 190c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 191c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 1922f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz if (!(fp = fopen(pathBuf, "re"))) { 193c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 194c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 195c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 197503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 1987b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen char *found_subsys; 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 200503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 201c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 202503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 203503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 204503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 205503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 206c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2077b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (!(found_subsys = strsep(&next, ":"))) { 208503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 209503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 210503df2075991cd03ddf43d14e05768a2138b9028San Mehat 2117b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (strcmp(found_subsys, subsys)) { 212503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 213503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 214503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 215503df2075991cd03ddf43d14e05768a2138b9028San Mehat 216503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 217503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 218503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 219503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 220503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 221503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 222503df2075991cd03ddf43d14e05768a2138b9028San Mehat 223503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 224503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 225503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 226503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 227503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 228503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 229503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 230c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 231c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2327b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen SLOGE("Failed to find subsys %s", subsys); 233503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 234503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 235503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 2367e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 237503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 238503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 239c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 240c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 241c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 242c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 243c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 244c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 245c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 246c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 24769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 24869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 24969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 250e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 251c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 25240267986dab665b206773f834153783898e50294Wei Wang char grpBuf[32]; 25340267986dab665b206773f834153783898e50294Wei Wang 254b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats grpBuf[0] = '\0'; 255b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats if (schedboost_enabled()) { 256b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats if (getCGroupSubsys(tid, "schedtune", grpBuf, sizeof(grpBuf)) < 0) return -1; 257b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats } 258b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats if ((grpBuf[0] == '\0') && cpusets_enabled()) { 25940267986dab665b206773f834153783898e50294Wei Wang if (getCGroupSubsys(tid, "cpuset", grpBuf, sizeof(grpBuf)) < 0) return -1; 260b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats } 261b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats if (grpBuf[0] == '\0') { 262b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats *policy = SP_FOREGROUND; 263b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats } else if (!strcmp(grpBuf, "foreground")) { 264a8d59faa753c027e7375067f96a30e6429178105Wei Wang *policy = SP_FOREGROUND; 265b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats } else if (!strcmp(grpBuf, "system-background")) { 266b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats *policy = SP_SYSTEM; 267b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats } else if (!strcmp(grpBuf, "background")) { 268b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats *policy = SP_BACKGROUND; 269b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats } else if (!strcmp(grpBuf, "top-app")) { 270b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats *policy = SP_TOP_APP; 271b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats } else { 272b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats errno = ERANGE; 273b4c4654c7ca829865c8ecfe74d1a15de11375926Erik Staats return -1; 274c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 275c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 276c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 277c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 278b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murrayint set_cpuset_policy(int tid, SchedPolicy policy) 279b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray{ 280b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // in the absence of cpusets, use the old sched policy 281795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen if (!cpusets_enabled()) { 282795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen return set_sched_policy(tid, policy); 283795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen } 284795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen 285b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (tid == 0) { 286b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray tid = gettid(); 287b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 288b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray policy = _policy(policy); 289b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray pthread_once(&the_once, __initialize); 290b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 291b43225eefb0e60858755d72103f9f9b53785b5d9Tim Murray int fd = -1; 292b43225eefb0e60858755d72103f9f9b53785b5d9Tim Murray int boost_fd = -1; 293b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 294b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 295b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cpuset_fd; 296ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = bg_schedboost_fd; 297b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 298b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 299b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 300b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 301b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cpuset_fd; 302955694b657012c50312de99e6f78084beae52d60Tim Murray boost_fd = fg_schedboost_fd; 3034284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray break; 3046647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP : 3056647bb51301ea101b73e7431888f70bb35a4fabbTim Murray fd = ta_cpuset_fd; 306955694b657012c50312de99e6f78084beae52d60Tim Murray boost_fd = ta_schedboost_fd; 3076647bb51301ea101b73e7431888f70bb35a4fabbTim Murray break; 3084284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray case SP_SYSTEM: 3094284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray fd = system_bg_cpuset_fd; 310b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 311b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 312ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = fd = -1; 313b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 314b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 315b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 316b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 317b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (errno != ESRCH && errno != ENOENT) 318b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return -errno; 319b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 320b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 321795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen if (schedboost_enabled()) { 322795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) { 323795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen if (errno != ESRCH && errno != ENOENT) 324795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen return -errno; 325795267d4c74821cce884c6f1e1082f00e8e12c4aIsaac Chen } 326ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos } 327ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos 328999102664c4aa752d7e90c7c5ec5da9e1d648ac9Tim Murray return 0; 329b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray} 330b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 331f5b8e3466055952449a499c6b0634018980d759bStephen Cranestatic void set_timerslack_ns(int tid, unsigned long slack) { 332d7967c1347cf83b7ff621629aeb69f5fb57d9976Elliott Hughes // v4.6+ kernels support the /proc/<tid>/timerslack_ns interface. 333d7967c1347cf83b7ff621629aeb69f5fb57d9976Elliott Hughes // TODO: once we've backported this, log if the open(2) fails. 334d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats if (__sys_supports_timerslack) { 335d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats char buf[64]; 336d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats snprintf(buf, sizeof(buf), "/proc/%d/timerslack_ns", tid); 337d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats int fd = open(buf, O_WRONLY | O_CLOEXEC); 338d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats if (fd != -1) { 339f5b8e3466055952449a499c6b0634018980d759bStephen Crane int len = snprintf(buf, sizeof(buf), "%lu", slack); 340d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats if (write(fd, buf, len) != len) { 341d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats SLOGE("set_timerslack_ns write failed: %s\n", strerror(errno)); 342d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats } 343d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats close(fd); 344d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats return; 345d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats } 346d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats } 347d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats 348d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats // TODO: Remove when /proc/<tid>/timerslack_ns interface is backported. 349d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats if ((tid == 0) || (tid == gettid())) { 350d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats if (prctl(PR_SET_TIMERSLACK, slack) == -1) { 351d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats SLOGE("set_timerslack_ns prctl failed: %s\n", strerror(errno)); 3522f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz } 3532f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz } 3542f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz} 3552f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz 356c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 357c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 35869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 35969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 36069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 36169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 362e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 363493dad966305a7fb555addd367532dd2af275a27San Mehat 364d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 365d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 366d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 367d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 368d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 369a2f37e4fd719722064438d5ca34f88a7fa9a5886Raja M snprintf(statfile, sizeof(statfile), "/proc/%d/stat", tid); 370d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 371d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 3722f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz int fd = open(statfile, O_RDONLY | O_CLOEXEC); 373d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 374d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 375d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 376d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 377d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 378d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 379d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 380d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 381d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 382d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 383d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 384d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 385d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 38610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 38710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3887e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 38910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 39010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 39129319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 39229319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 3936647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP: 3947e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 39510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 39610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 39710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 39810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 39988ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes case SP_RT_APP: 40088ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes SLOGD("RT tid %d (%s)", tid, thread_name); 40188ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes break; 40210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 4037e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 40410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 405d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 406d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 407d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 40840267986dab665b206773f834153783898e50294Wei Wang if (schedboost_enabled()) { 409aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray int boost_fd = -1; 410b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 411b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 412aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray boost_fd = bg_schedboost_fd; 413b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 414b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 415b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 416b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 417955694b657012c50312de99e6f78084beae52d60Tim Murray boost_fd = fg_schedboost_fd; 418aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray break; 4196647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP: 420955694b657012c50312de99e6f78084beae52d60Tim Murray boost_fd = ta_schedboost_fd; 421b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 42288ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes case SP_RT_APP: 42388ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes boost_fd = rt_schedboost_fd; 42488ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes break; 425b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 426aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray boost_fd = -1; 427b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 428b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 429b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 43040267986dab665b206773f834153783898e50294Wei Wang if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) { 431493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 432493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 433493dad966305a7fb555addd367532dd2af275a27San Mehat } 434aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray 435493dad966305a7fb555addd367532dd2af275a27San Mehat } 436493dad966305a7fb555addd367532dd2af275a27San Mehat 437d32331fb272048eeb55184bee15071fb95b6a6c2Erik Staats set_timerslack_ns(tid, policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG); 438422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 439493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 440493dad966305a7fb555addd367532dd2af275a27San Mehat} 4410384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 442bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 443bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 444bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 445bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 44638d2567c9ffa089661e784b63a5448f8a16572c8Elliott Hughesint set_sched_policy(int /*tid*/, SchedPolicy /*policy*/) { 447bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 448bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 449bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 45038d2567c9ffa089661e784b63a5448f8a16572c8Elliott Hughesint get_sched_policy(int /*tid*/, SchedPolicy* policy) { 451bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 452bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 453bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 454bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 455bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 456bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 45786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 45886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 45969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 46086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 46186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 46286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 46310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 46410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 46510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 4666647bb51301ea101b73e7431888f70bb35a4fabbTim Murray [SP_TOP_APP] = "ta", 46788ef9f062950e6f38efae82fd2527cda2c8883f4Joel Fernandes [SP_RT_APP] = "rt", 46886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 46986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 47086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 47186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 47286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 47386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 474