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; 686647bb51301ea101b73e7431888f70bb35a4fabbTim Murraystatic int ta_cpuset_fd = -1; // special cpuset for top app 69aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#endif 70aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray 71aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray// File descriptors open to /dev/stune/../tasks, setup by initialize, or -1 on error 72ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int bg_schedboost_fd = -1; 73ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int fg_schedboost_fd = -1; 74955694b657012c50312de99e6f78084beae52d60Tim Murraystatic int ta_schedboost_fd = -1; 75b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 76e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 77b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int add_tid_to_cgroup(int tid, int fd) 78493dad966305a7fb555addd367532dd2af275a27San Mehat{ 79e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 80b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGE("add_tid_to_cgroup failed; fd=%d\n", fd); 81b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 82493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 83805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 84493dad966305a7fb555addd367532dd2af275a27San Mehat 85253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 86253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 87253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 88253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 89253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 90253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 91253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 92253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 93253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 94253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 95253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 96e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 97e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 98e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 99e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 100e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 101e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 102b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGW("add_tid_to_cgroup failed to write '%s' (%s); fd=%d\n", 103b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray ptr, strerror(errno), fd); 104b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 105493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 106493dad966305a7fb555addd367532dd2af275a27San Mehat } 107493dad966305a7fb555addd367532dd2af275a27San Mehat 108493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 109493dad966305a7fb555addd367532dd2af275a27San Mehat} 110493dad966305a7fb555addd367532dd2af275a27San Mehat 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 112e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 113e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 114e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 115e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 116e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 1175b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 11810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 119e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 120e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 121e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 122522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews filename = "/dev/cpuctl/bg_non_interactive/tasks"; 1235b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 124e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 125e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 126493dad966305a7fb555addd367532dd2af275a27San Mehat } 127e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 128e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 129493dad966305a7fb555addd367532dd2af275a27San Mehat } 130b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 131b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifdef USE_CPUSETS 132b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (!access("/dev/cpuset/tasks", F_OK)) { 133b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 134b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/foreground/tasks"; 135b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 136b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/background/tasks"; 137b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1384284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray filename = "/dev/cpuset/system-background/tasks"; 1394284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray system_bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1406647bb51301ea101b73e7431888f70bb35a4fabbTim Murray filename = "/dev/cpuset/top-app/tasks"; 1416647bb51301ea101b73e7431888f70bb35a4fabbTim Murray ta_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1424284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray 143ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#ifdef USE_SCHEDBOOST 144955694b657012c50312de99e6f78084beae52d60Tim Murray filename = "/dev/stune/top-app/tasks"; 145955694b657012c50312de99e6f78084beae52d60Tim Murray ta_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 14611cde567a8fd6fd37cd462e24dd97d0f57bb12a4Todd Kjos filename = "/dev/stune/foreground/tasks"; 147ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos fg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 1485dcff8f2b19a53abe7c632a22f455df396554afeTim Murray filename = "/dev/stune/background/tasks"; 149ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos bg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 150ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#endif 151b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 152b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 153c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 154c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 155c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 1567b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen * Returns the path under the requested cgroup subsystem (if it exists) 157c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 158503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 159c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 160503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 161c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 162c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 163c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 164c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 165c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 1667b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenenstatic int getCGroupSubsys(int tid, const char* subsys, char* buf, size_t bufLen) 167c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 1689b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 169c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 170503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 171503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 172c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 173c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 174503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 175c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 176c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 177c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 179503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 1807b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen char *found_subsys; 181503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 182503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 183c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 184503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 185503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 186503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 187503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 188c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 1897b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (!(found_subsys = strsep(&next, ":"))) { 190503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 191503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 192503df2075991cd03ddf43d14e05768a2138b9028San Mehat 1937b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (strcmp(found_subsys, subsys)) { 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 195503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 197503df2075991cd03ddf43d14e05768a2138b9028San Mehat 198503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 200503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 201503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 202503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 203503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 204503df2075991cd03ddf43d14e05768a2138b9028San Mehat 205503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 206503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 207503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 208503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 209503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 210503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 211503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 212c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 213c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2147b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen SLOGE("Failed to find subsys %s", subsys); 215503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 216503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 217503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 2187e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 219503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 220503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 221c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 222c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 223c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 224c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 225c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 226c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 227c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 228c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 22969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 23069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 23169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 232e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 233c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 234c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 235c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 2367b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen#ifdef USE_CPUSETS 2377b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (getCGroupSubsys(tid, "cpuset", grpBuf, sizeof(grpBuf)) < 0) 2387b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen return -1; 2397b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (grpBuf[0] == '\0') { 2407b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen *policy = SP_FOREGROUND; 2417b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } else if (!strcmp(grpBuf, "foreground")) { 2427b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen *policy = SP_FOREGROUND; 2437b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } else if (!strcmp(grpBuf, "background")) { 2447b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen *policy = SP_BACKGROUND; 2457b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } else if (!strcmp(grpBuf, "top-app")) { 2467b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen *policy = SP_TOP_APP; 2477b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } else { 2487b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen errno = ERANGE; 2497b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen return -1; 2507b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } 2517b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen#else 2527b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (getCGroupSubsys(tid, "cpu", grpBuf, sizeof(grpBuf)) < 0) 253c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 254c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 25510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 256522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews } else if (!strcmp(grpBuf, "bg_non_interactive")) { 257522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews *policy = SP_BACKGROUND; 258c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 259c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 260c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 261c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 2627b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen#endif 263c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 264c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 265c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 266c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 267c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 268c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 269c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 270c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 271c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 272c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 273c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 274c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 275c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 276c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 277c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 278c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 279b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murrayint set_cpuset_policy(int tid, SchedPolicy policy) 280b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray{ 281b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // in the absence of cpusets, use the old sched policy 282b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifndef USE_CPUSETS 283b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return set_sched_policy(tid, policy); 284b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#else 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 321aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#ifdef USE_SCHEDBOOST 322ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) { 323ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos if (errno != ESRCH && errno != ENOENT) 324ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos return -errno; 325ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos } 326aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#endif 327ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos 328999102664c4aa752d7e90c7c5ec5da9e1d648ac9Tim Murray return 0; 329b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 330b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray} 331b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 332c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 333c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 33469bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 33569bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 33669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 33769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 338e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 339493dad966305a7fb555addd367532dd2af275a27San Mehat 340d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 341d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 342d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 343d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 344d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 345d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 346d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 347d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 348d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 349d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 350d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 351d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 352d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 353d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 354d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 355d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 356d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 357d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 358d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 359d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 360d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 361d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 362d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 36310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 36410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3657e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 36610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 36710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 36829319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 36929319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 3706647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP: 3717e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 37210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 37310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 37410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 37510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 37610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3777e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 37810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 379d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 380d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 381d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 382493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 383aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray int fd = -1; 384aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray int boost_fd = -1; 385b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 386b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 387b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cgroup_fd; 388aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray boost_fd = bg_schedboost_fd; 389b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 390b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 391b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 392b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 393aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray fd = fg_cgroup_fd; 394955694b657012c50312de99e6f78084beae52d60Tim Murray boost_fd = fg_schedboost_fd; 395aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray break; 3966647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP: 397b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cgroup_fd; 398955694b657012c50312de99e6f78084beae52d60Tim Murray boost_fd = ta_schedboost_fd; 399b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 400b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 401b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = -1; 402aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray boost_fd = -1; 403b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 404b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 405b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 406b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 407b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 408493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 409493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 410493dad966305a7fb555addd367532dd2af275a27San Mehat } 411aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray 412aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#ifdef USE_SCHEDBOOST 413aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) { 414aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray if (errno != ESRCH && errno != ENOENT) 415aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray return -errno; 416aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray } 417aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#endif 418493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 419493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 420493dad966305a7fb555addd367532dd2af275a27San Mehat 421493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 422493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 423493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 424b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SCHED_BATCH : SCHED_NORMAL, 425493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 426493dad966305a7fb555addd367532dd2af275a27San Mehat } 427493dad966305a7fb555addd367532dd2af275a27San Mehat 4284cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos prctl(PR_SET_TIMERSLACK_PID, 4294cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG, tid); 430422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 431493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 432493dad966305a7fb555addd367532dd2af275a27San Mehat} 4330384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 434bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 435bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 436bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 437bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 43812717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint set_sched_policy(int tid UNUSED, SchedPolicy policy UNUSED) 439bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 440bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 441bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 442bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 44312717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint get_sched_policy(int tid UNUSED, SchedPolicy *policy) 444bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 445bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 446bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 447bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 448bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 449bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 450bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 45186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 45286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 45369bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 45486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 45586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 45686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 45710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 45810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 45910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 4606647bb51301ea101b73e7431888f70bb35a4fabbTim Murray [SP_TOP_APP] = "ta", 46186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 46286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 46386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 46486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 46586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 46686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 467