sched_policy.c revision 9b828adfad09200f3f1bd3602187fe3dd5335774
112717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzyn/* 2493dad966305a7fb555addd367532dd2af275a27San Mehat** Copyright 2007, The Android Open Source Project 3493dad966305a7fb555addd367532dd2af275a27San Mehat** 4493dad966305a7fb555addd367532dd2af275a27San Mehat** Licensed under the Apache License, Version 2.0 (the "License"); 5493dad966305a7fb555addd367532dd2af275a27San Mehat** you may not use this file except in compliance with the License. 6493dad966305a7fb555addd367532dd2af275a27San Mehat** You may obtain a copy of the License at 7493dad966305a7fb555addd367532dd2af275a27San Mehat** 8493dad966305a7fb555addd367532dd2af275a27San Mehat** http://www.apache.org/licenses/LICENSE-2.0 9493dad966305a7fb555addd367532dd2af275a27San Mehat** 10493dad966305a7fb555addd367532dd2af275a27San Mehat** Unless required by applicable law or agreed to in writing, software 11493dad966305a7fb555addd367532dd2af275a27San Mehat** distributed under the License is distributed on an "AS IS" BASIS, 12493dad966305a7fb555addd367532dd2af275a27San Mehat** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13493dad966305a7fb555addd367532dd2af275a27San Mehat** 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 53422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 54e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 55e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 56c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int __sys_supports_schedgroups = -1; 57c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 58e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. 59e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int bg_cgroup_fd = -1; 6010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kastenstatic int fg_cgroup_fd = -1; 61e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 62e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 63e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int add_tid_to_cgroup(int tid, SchedPolicy policy) 64493dad966305a7fb555addd367532dd2af275a27San Mehat{ 65493dad966305a7fb555addd367532dd2af275a27San Mehat int fd; 66e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 6710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 6810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 69e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick fd = bg_cgroup_fd; 7010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 7110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 7229319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 7329319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 7410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = fg_cgroup_fd; 7510ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 7610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 7710ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten fd = -1; 7810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 79e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 80e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 81e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 8210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGE("add_tid_to_cgroup failed; policy=%d\n", policy); 83493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 84805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 85493dad966305a7fb555addd367532dd2af275a27San Mehat 86253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 87253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 88253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 89253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 90253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 91253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 92253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 93253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 94253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 95253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 96253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 97e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 98e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 99e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 100e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 101e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 102e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 10310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGW("add_tid_to_cgroup failed to write '%s' (%s); policy=%d\n", 10410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten ptr, strerror(errno), policy); 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 } 130c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 131c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 132c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 133c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * Try to get the scheduler group. 134c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 135503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 136c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 137503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 138c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 139c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 140c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 141c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 142c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 143c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int getSchedulerGroup(int tid, char* buf, size_t bufLen) 144c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 1459b828adfad09200f3f1bd3602187fe3dd5335774Elliott Hughes#if defined(__ANDROID__) 146c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 147503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 148503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 149c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 150c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 151503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 152c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 153c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 154c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 155503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 156503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 157503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *subsys; 158503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 159503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 160c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 161503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 162503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 163503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 164503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 165c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 166503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(subsys = strsep(&next, ":"))) { 167503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 168503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 169503df2075991cd03ddf43d14e05768a2138b9028San Mehat 170503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (strcmp(subsys, "cpu")) { 171503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 172503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 173503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 174503df2075991cd03ddf43d14e05768a2138b9028San Mehat 175503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 176503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 177503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 179503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 180503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 181503df2075991cd03ddf43d14e05768a2138b9028San Mehat 182503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 183503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 184503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 185503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 186503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 187503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 188503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 189c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 190c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 1917e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Failed to find cpu subsys"); 192503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 193503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 194503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 1957e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 196503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 197503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 198c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 199c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 200c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 201c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 202c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 203c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 204c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 205c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 20669bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 20769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 20869bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 209e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 210c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 211c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 212c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 213c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) 214c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 215c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 21610ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten *policy = SP_FOREGROUND; 217522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews } else if (!strcmp(grpBuf, "bg_non_interactive")) { 218522d72b7020a7d2f975531c7214ff34225391abaRiley Andrews *policy = SP_BACKGROUND; 219c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 220c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 221c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 222c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 223c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 224c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 225c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 226c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 227c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 228c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 229c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 230c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 231c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 232c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 233c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 234c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 235c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 236c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 237c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 238c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 239c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 240c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 24169bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten if (tid == 0) { 24269bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten tid = gettid(); 24369bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten } 24469bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 245e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 246493dad966305a7fb555addd367532dd2af275a27San Mehat 247d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 248d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 249d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 250d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 251d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 252d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 253d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 254d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 255d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 256d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 257d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 258d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 259d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 260d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 261d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 262d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 263d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 264d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 265d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 266d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 267d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 268d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 269d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 27010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten switch (policy) { 27110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_BACKGROUND: 2727e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 27310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 27410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_FOREGROUND: 27529319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_APP: 27629319a6753569fb3ef160c2de2f1c4d9d1398178Dima Zavin case SP_AUDIO_SYS: 2777e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 27810ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 27910ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten case SP_SYSTEM: 28010ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten SLOGD("/// tid %d (%s)", tid, thread_name); 28110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 28210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten default: 2837e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 28410ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten break; 285d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 286d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 287d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 288493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 289e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (add_tid_to_cgroup(tid, policy)) { 290493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 291493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 292493dad966305a7fb555addd367532dd2af275a27San Mehat } 293493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 294493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 295493dad966305a7fb555addd367532dd2af275a27San Mehat 296493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 297493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 298493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 299493dad966305a7fb555addd367532dd2af275a27San Mehat SCHED_BATCH : SCHED_NORMAL, 300493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 301493dad966305a7fb555addd367532dd2af275a27San Mehat } 302493dad966305a7fb555addd367532dd2af275a27San Mehat 303422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi prctl(PR_SET_TIMERSLACK_PID, policy == SP_BACKGROUND ? TIMER_SLACK_BG : 0, tid); 304422852ef5c0c2b0b5e031f80f480486df3d185a0Ruchi Kandoi 305493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 306493dad966305a7fb555addd367532dd2af275a27San Mehat} 3070384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 308bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#else 309bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 310bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown/* Stubs for non-Android targets. */ 311bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 31212717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint set_sched_policy(int tid UNUSED, SchedPolicy policy UNUSED) 313bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 314bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 315bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 316bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 31712717169a51335f4b20b7c78a63b9ab66a81a366Mark Salyzynint get_sched_policy(int tid UNUSED, SchedPolicy *policy) 318bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown{ 319bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown *policy = SP_SYSTEM_DEFAULT; 320bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown return 0; 321bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown} 322bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 323bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown#endif 324bff8f3fa9848e52e3f3fe773796a03a80133992aJeff Brown 32586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 32686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 32769bfb1f099164ae7ba44b5d0f7ba7c47cbbafd4dGlenn Kasten policy = _policy(policy); 32886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 32986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 33086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 33110ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_SYSTEM] = " ", 33210ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_APP] = "aa", 33310ec3c7645bfdb70518dc1b21df40ad5478589e3Glenn Kasten [SP_AUDIO_SYS] = "as", 33486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 33586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 33686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 33786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 33886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 33986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 34086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten 341