sched_policy.cpp revision aa45cb85e3d5d7f717feab6fe421ef377301c559
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; 74b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 75e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 76b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int add_tid_to_cgroup(int tid, int fd) 77493dad966305a7fb555addd367532dd2af275a27San Mehat{ 78e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 79b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGE("add_tid_to_cgroup failed; fd=%d\n", fd); 80b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 81493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 82805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 83493dad966305a7fb555addd367532dd2af275a27San Mehat 84253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 85253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 86253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 87253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 88253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 89253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 90253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 91253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 92253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 93253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 94253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 95e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 96e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 97e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 98e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 99e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 100e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 101b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGW("add_tid_to_cgroup failed to write '%s' (%s); fd=%d\n", 102b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray ptr, strerror(errno), fd); 103b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 104493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 105493dad966305a7fb555addd367532dd2af275a27San Mehat } 106493dad966305a7fb555addd367532dd2af275a27San Mehat 107493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 108493dad966305a7fb555addd367532dd2af275a27San Mehat} 109493dad966305a7fb555addd367532dd2af275a27San Mehat 110e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 112e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 113e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 114e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 115e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 1165b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 11710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 118e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 119e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 120e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 121522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews filename = "/dev/cpuctl/bg_non_interactive/tasks"; 1225b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 123e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 124e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 125493dad966305a7fb555addd367532dd2af275a27San Mehat } 126e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 127e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 128493dad966305a7fb555addd367532dd2af275a27San Mehat } 129b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 130b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifdef USE_CPUSETS 131b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (!access("/dev/cpuset/tasks", F_OK)) { 132b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 133b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/foreground/tasks"; 134b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 135b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/background/tasks"; 136b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1374284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray filename = "/dev/cpuset/system-background/tasks"; 1384284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray system_bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1396647bb51301ea101b73e7431888f70bb35a4fabbTim Murray filename = "/dev/cpuset/top-app/tasks"; 1406647bb51301ea101b73e7431888f70bb35a4fabbTim Murray ta_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1414284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray 142ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#ifdef USE_SCHEDBOOST 14311cde567a8fd6fd37cd462e24dd97d0f57bb12a4Todd Kjos filename = "/dev/stune/foreground/tasks"; 144ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos fg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 14511cde567a8fd6fd37cd462e24dd97d0f57bb12a4Todd Kjos filename = "/dev/stune/tasks"; 146ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos bg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 147ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#endif 148b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 149b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 150c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 151c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 152c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 1537b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen * Returns the path under the requested cgroup subsystem (if it exists) 154c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 155503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 156c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 157503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 158c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 159c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 160c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 161c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 162c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 1637b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenenstatic int getCGroupSubsys(int tid, const char* subsys, char* buf, size_t bufLen) 164c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 1659b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 166c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 167503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 168503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 169c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 170c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 171503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 172c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 173c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 174c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 175503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 176503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 1777b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen char *found_subsys; 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 179503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 180c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 181503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 182503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 183503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 184503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 185c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 1867b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (!(found_subsys = strsep(&next, ":"))) { 187503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 189503df2075991cd03ddf43d14e05768a2138b9028San Mehat 1907b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (strcmp(found_subsys, subsys)) { 191503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 192503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 193503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat 195503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 197503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 198503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 199503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 200503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 201503df2075991cd03ddf43d14e05768a2138b9028San Mehat 202503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 203503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 204503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 205503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 206503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 207503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 208503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 209c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 210c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 2117b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen SLOGE("Failed to find subsys %s", subsys); 212503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 213503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 214503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 2157e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 216503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 217503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 218c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 219c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 220c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 221c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 222c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 223c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 224c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 225c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 22669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 22769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 22869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 229e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 230c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 231c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 232c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 2337b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen#ifdef USE_CPUSETS 2347b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (getCGroupSubsys(tid, "cpuset", grpBuf, sizeof(grpBuf)) < 0) 2357b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen return -1; 2367b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (grpBuf[0] == '\0') { 2377b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen *policy = SP_FOREGROUND; 2387b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } else if (!strcmp(grpBuf, "foreground")) { 2397b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen *policy = SP_FOREGROUND; 2407b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } else if (!strcmp(grpBuf, "background")) { 2417b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen *policy = SP_BACKGROUND; 2427b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } else if (!strcmp(grpBuf, "top-app")) { 2437b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen *policy = SP_TOP_APP; 2447b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } else { 2457b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen errno = ERANGE; 2467b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen return -1; 2477b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen } 2487b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen#else 2497b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen if (getCGroupSubsys(tid, "cpu", grpBuf, sizeof(grpBuf)) < 0) 250c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 251c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 25210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 253522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews } else if (!strcmp(grpBuf, "bg_non_interactive")) { 254522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews *policy = SP_BACKGROUND; 255c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 256c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 257c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 258c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 2597b173a148befe5fdc6ce7485238ff2f51d1995a2Martijn Coenen#endif 260c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 261c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 262c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 263c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 264c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 265c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 266c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 267c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 268c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 269c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 270c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 271c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 272c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 273c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 274c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 275c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 276b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murrayint set_cpuset_policy(int tid, SchedPolicy policy) 277b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray{ 278b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray // in the absence of cpusets, use the old sched policy 279b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifndef USE_CPUSETS 280b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return set_sched_policy(tid, policy); 281b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#else 282b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (tid == 0) { 283b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray tid = gettid(); 284b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 285b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray policy = _policy(policy); 286b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray pthread_once(&the_once, __initialize); 287b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 288b43225eefb0e60858755d72103f9f9b53785b5d9Tim Murray int fd = -1; 289b43225eefb0e60858755d72103f9f9b53785b5d9Tim Murray int boost_fd = -1; 290b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 291b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 292b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cpuset_fd; 293ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = bg_schedboost_fd; 294b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 295b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 296b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 297b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 298b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cpuset_fd; 29913398711387e9ce193c907c11191ce0998dda5afSrinath Sridharan boost_fd = bg_schedboost_fd; 3004284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray break; 3016647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP : 3026647bb51301ea101b73e7431888f70bb35a4fabbTim Murray fd = ta_cpuset_fd; 3036647bb51301ea101b73e7431888f70bb35a4fabbTim Murray boost_fd = fg_schedboost_fd; 3046647bb51301ea101b73e7431888f70bb35a4fabbTim Murray break; 3054284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray case SP_SYSTEM: 3064284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray fd = system_bg_cpuset_fd; 307b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 308b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 309ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = fd = -1; 310b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 311b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 312b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 313b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 314b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (errno != ESRCH && errno != ENOENT) 315b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return -errno; 316b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 317b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 318aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#ifdef USE_SCHEDBOOST 319ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) { 320ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos if (errno != ESRCH && errno != ENOENT) 321ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos return -errno; 322ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos } 323aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#endif 324ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos 325999102664c4aa752d7e90c7c5ec5da9e1d648ac9Tim Murray return 0; 326b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 327b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray} 328b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 329c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 330c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 33169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 33269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 33369bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 33469bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 335e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 336493dad966305a7fb555addd367532dd2af275a27San Mehat 337d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 338d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 339d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 340d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 341d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 342d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 343d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 344d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 345d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 346d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 347d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 348d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 349d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 350d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 351d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 352d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 353d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 354d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 355d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 356d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 357d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 358d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 359d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 36010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 36110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3627e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 36310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 36410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 36529319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 36629319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 3676647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP: 3687e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 36910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 37010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 37110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 37210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 37310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3747e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 37510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 376d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 377d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 378d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 379493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 380aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray int fd = -1; 381aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray int boost_fd = -1; 382b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 383b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 384b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cgroup_fd; 385aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray boost_fd = bg_schedboost_fd; 386b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 387b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 388b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 389b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 390aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray fd = fg_cgroup_fd; 391aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray boost_fd = bg_schedboost_fd; 392aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray break; 3936647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP: 394b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cgroup_fd; 395aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray boost_fd = fg_schedboost_fd; 396b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 397b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 398b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = -1; 399aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray boost_fd = -1; 400b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 401b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 402b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 403b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 404b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 405493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 406493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 407493dad966305a7fb555addd367532dd2af275a27San Mehat } 408aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray 409aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#ifdef USE_SCHEDBOOST 410aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) { 411aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray if (errno != ESRCH && errno != ENOENT) 412aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray return -errno; 413aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray } 414aa45cb85e3d5d7f717feab6fe421ef377301c559Tim Murray#endif 415493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 416493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 417493dad966305a7fb555addd367532dd2af275a27San Mehat 418493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 419493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 420493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 421b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SCHED_BATCH : SCHED_NORMAL, 422493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 423493dad966305a7fb555addd367532dd2af275a27San Mehat } 424493dad966305a7fb555addd367532dd2af275a27San Mehat 4254cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos prctl(PR_SET_TIMERSLACK_PID, 4264cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG, tid); 427422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 428493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 429493dad966305a7fb555addd367532dd2af275a27San Mehat} 4300384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 431bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 432bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 433bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 434bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 43512717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint set_sched_policy(int tid UNUSED, SchedPolicy policy UNUSED) 436bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 437bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 438bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 439bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 44012717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint get_sched_policy(int tid UNUSED, SchedPolicy *policy) 441bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 442bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 443bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 444bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 445bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 446bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 447bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 44886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 44986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 45069bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 45186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 45286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 45386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 45410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 45510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 45610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 4576647bb51301ea101b73e7431888f70bb35a4fabbTim Murray [SP_TOP_APP] = "ta", 45886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 45986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 46086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 46186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 46286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 46386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 464