sched_policy.cpp revision 2e336b1da1ed66e943089c812f7697f5de450936
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 48422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi// timer slack value in nS enforced when the thread moves to background 49422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi#define TIMER_SLACK_BG 40000000 504cdce427f9ba0339ac7c58fdb4f56ac3630abf34Todd Kjos#define TIMER_SLACK_FG 50000 51422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 52e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 53e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 54c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int __sys_supports_schedgroups = -1; 552e336b1da1ed66e943089c812f7697f5de450936John Reckstatic int __sys_supports_timerslack = -1; 56c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 57e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. 58e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int bg_cgroup_fd = -1; 5910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int fg_cgroup_fd = -1; 60e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 61919bb66f73c679cf81efc6d2433ad75197891ba6Elliott Hughes#ifdef USE_CPUSETS 62b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray// File descriptors open to /dev/cpuset/../tasks, setup by initialize, or -1 on error 634284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murraystatic int system_bg_cpuset_fd = -1; 64b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int bg_cpuset_fd = -1; 65b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int fg_cpuset_fd = -1; 666647bb51301ea101b73e7431888f70bb35a4fabbTim Murraystatic int ta_cpuset_fd = -1; // special cpuset for top app 67ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int bg_schedboost_fd = -1; 68ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjosstatic int fg_schedboost_fd = -1; 69919bb66f73c679cf81efc6d2433ad75197891ba6Elliott Hughes#endif 70b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 71e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 72b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murraystatic int add_tid_to_cgroup(int tid, int fd) 73493dad966305a7fb555addd367532dd2af275a27San Mehat{ 74e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 75b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGE("add_tid_to_cgroup failed; fd=%d\n", fd); 76b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 77493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 78805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 79493dad966305a7fb555addd367532dd2af275a27San Mehat 80253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 81253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 82253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 83253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 84253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 85253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 86253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 87253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 88253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 89253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 90253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 91e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 92e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 93e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 94e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 95e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 96e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 97b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray SLOGW("add_tid_to_cgroup failed to write '%s' (%s); fd=%d\n", 98b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray ptr, strerror(errno), fd); 99b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray errno = EINVAL; 100493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 101493dad966305a7fb555addd367532dd2af275a27San Mehat } 102493dad966305a7fb555addd367532dd2af275a27San Mehat 103493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 104493dad966305a7fb555addd367532dd2af275a27San Mehat} 105493dad966305a7fb555addd367532dd2af275a27San Mehat 106e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 107e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 1082e336b1da1ed66e943089c812f7697f5de450936John Reck if (!access("/dev/cpuctl/tasks", W_OK)) { 109e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 110e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 1125b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 11310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten if (fg_cgroup_fd < 0) { 114e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 115e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 116e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 117522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews filename = "/dev/cpuctl/bg_non_interactive/tasks"; 1185b878d24c1f01a5f131d470280b51bcfb5638600Jeff Brown bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); 119e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 120e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 121493dad966305a7fb555addd367532dd2af275a27San Mehat } 122e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 123e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 124493dad966305a7fb555addd367532dd2af275a27San Mehat } 125b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 126b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#ifdef USE_CPUSETS 1272e336b1da1ed66e943089c812f7697f5de450936John Reck if (!access("/dev/cpuset/tasks", W_OK)) { 128b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 129b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/foreground/tasks"; 130b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 131b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray filename = "/dev/cpuset/background/tasks"; 132b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1334284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray filename = "/dev/cpuset/system-background/tasks"; 1344284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray system_bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1356647bb51301ea101b73e7431888f70bb35a4fabbTim Murray filename = "/dev/cpuset/top-app/tasks"; 1366647bb51301ea101b73e7431888f70bb35a4fabbTim Murray ta_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); 1374284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray 138ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#ifdef USE_SCHEDBOOST 13911cde567a8fd6fd37cd462e24dd97d0f57bb12a4Todd Kjos filename = "/dev/stune/foreground/tasks"; 140ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos fg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 14111cde567a8fd6fd37cd462e24dd97d0f57bb12a4Todd Kjos filename = "/dev/stune/tasks"; 142ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos bg_schedboost_fd = open(filename, O_WRONLY | O_CLOEXEC); 143ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos#endif 144b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 145b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 1462e336b1da1ed66e943089c812f7697f5de450936John Reck 1472e336b1da1ed66e943089c812f7697f5de450936John Reck char buf[64]; 1482e336b1da1ed66e943089c812f7697f5de450936John Reck snprintf(buf, sizeof(buf), "/proc/%d/timerslack_ns", getpid()); 1492e336b1da1ed66e943089c812f7697f5de450936John Reck __sys_supports_timerslack = !access(buf, W_OK); 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); 1712f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz if (!(fp = fopen(pathBuf, "re"))) { 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; 299ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = fg_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; 3074284f9f3a3d471208d7a9341056e4d7af886dab3Tim Murray boost_fd = bg_schedboost_fd; 308b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 309b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 310ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos boost_fd = fd = -1; 311b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 312b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 313b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 314b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 315b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (errno != ESRCH && errno != ENOENT) 316b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray return -errno; 317b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 318b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 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 } 323ba8a47531c5ebc5e1322088354d2114f6892f3fdTodd Kjos 324999102664c4aa752d7e90c7c5ec5da9e1d648ac9Tim Murray return 0; 325b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray#endif 326b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray} 327b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 3282f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultzstatic void set_timerslack_ns(int tid, unsigned long long slack) { 329d7967c1347cf83b7ff621629aeb69f5fb57d9976Elliott Hughes // v4.6+ kernels support the /proc/<tid>/timerslack_ns interface. 330d7967c1347cf83b7ff621629aeb69f5fb57d9976Elliott Hughes // TODO: once we've backported this, log if the open(2) fails. 3312f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz char buf[64]; 3322f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz snprintf(buf, sizeof(buf), "/proc/%d/timerslack_ns", tid); 3332f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz int fd = open(buf, O_WRONLY | O_CLOEXEC); 3342f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz if (fd != -1) { 3352f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz int len = snprintf(buf, sizeof(buf), "%llu", slack); 3362f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz if (write(fd, buf, len) != len) { 3372f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz SLOGE("set_timerslack_ns write failed: %s\n", strerror(errno)); 3382f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz } 3392f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz close(fd); 3402f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz return; 3412f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz } 3422f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz} 3432f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz 344c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 345c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 34669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 34769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 34869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 34969bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 350e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 351493dad966305a7fb555addd367532dd2af275a27San Mehat 352d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 353d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 354d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 355d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 356d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 357a2f37e4fd719722064438d5ca34f88a7fa9a5886Raja M snprintf(statfile, sizeof(statfile), "/proc/%d/stat", tid); 358d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 359d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 3602f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz int fd = open(statfile, O_RDONLY | O_CLOEXEC); 361d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 362d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 363d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 364d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 365d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 366d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 367d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 368d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 369d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 370d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 371d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 372d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 373d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 37410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 37510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 3767e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 37710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 37810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 37929319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 38029319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 3816647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP: 3827e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 38310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 38410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 38510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 38610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 38710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 3887e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 38910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 390d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 391d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 392d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 393493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 394b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray int fd; 395b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray switch (policy) { 396b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_BACKGROUND: 397b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = bg_cgroup_fd; 398b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 399b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_FOREGROUND: 400b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_APP: 401b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray case SP_AUDIO_SYS: 4026647bb51301ea101b73e7431888f70bb35a4fabbTim Murray case SP_TOP_APP: 403b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = fg_cgroup_fd; 404b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 405b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray default: 406b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray fd = -1; 407b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray break; 408b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray } 409b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 410b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray 411b769c8d24fd7be96f8968aa4c80b669525b930d3Tim Murray if (add_tid_to_cgroup(tid, fd) != 0) { 412493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 413493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 414493dad966305a7fb555addd367532dd2af275a27San Mehat } 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 4252e336b1da1ed66e943089c812f7697f5de450936John Reck if (__sys_supports_timerslack) { 4262e336b1da1ed66e943089c812f7697f5de450936John Reck set_timerslack_ns(tid, policy == SP_BACKGROUND ? 4272f13f0a48a6fded990e68b03ab1e44edf8c58164John Stultz TIMER_SLACK_BG : TIMER_SLACK_FG); 4282e336b1da1ed66e943089c812f7697f5de450936John Reck } 429422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 430493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 431493dad966305a7fb555addd367532dd2af275a27San Mehat} 4320384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 433bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 434bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 435bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 436bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 43712717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint set_sched_policy(int tid UNUSED, SchedPolicy policy UNUSED) 438bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 439bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 440bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 441bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 44212717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint get_sched_policy(int tid UNUSED, SchedPolicy *policy) 443bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 444bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 445bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 446bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 447bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 448bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 449bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 45086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 45186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 45269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 45386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 45486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 45586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 45610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 45710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 45810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 4596647bb51301ea101b73e7431888f70bb35a4fabbTim Murray [SP_TOP_APP] = "ta", 46086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 46186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 46286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 46386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 46486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 46586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 466