sched_policy.c revision 86c7cc81891a69ace7044de667b0624c284ee82b
10384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 2493dad966305a7fb555addd367532dd2af275a27San Mehat/* libs/cutils/sched_policy.c 3493dad966305a7fb555addd367532dd2af275a27San Mehat** 4493dad966305a7fb555addd367532dd2af275a27San Mehat** Copyright 2007, The Android Open Source Project 5493dad966305a7fb555addd367532dd2af275a27San Mehat** 6493dad966305a7fb555addd367532dd2af275a27San Mehat** Licensed under the Apache License, Version 2.0 (the "License"); 7493dad966305a7fb555addd367532dd2af275a27San Mehat** you may not use this file except in compliance with the License. 8493dad966305a7fb555addd367532dd2af275a27San Mehat** You may obtain a copy of the License at 9493dad966305a7fb555addd367532dd2af275a27San Mehat** 10493dad966305a7fb555addd367532dd2af275a27San Mehat** http://www.apache.org/licenses/LICENSE-2.0 11493dad966305a7fb555addd367532dd2af275a27San Mehat** 12493dad966305a7fb555addd367532dd2af275a27San Mehat** Unless required by applicable law or agreed to in writing, software 13493dad966305a7fb555addd367532dd2af275a27San Mehat** distributed under the License is distributed on an "AS IS" BASIS, 14493dad966305a7fb555addd367532dd2af275a27San Mehat** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15493dad966305a7fb555addd367532dd2af275a27San Mehat** See the License for the specific language governing permissions and 16493dad966305a7fb555addd367532dd2af275a27San Mehat** limitations under the License. 17493dad966305a7fb555addd367532dd2af275a27San Mehat*/ 18493dad966305a7fb555addd367532dd2af275a27San Mehat 19493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdio.h> 20493dad966305a7fb555addd367532dd2af275a27San Mehat#include <stdlib.h> 21493dad966305a7fb555addd367532dd2af275a27San Mehat#include <unistd.h> 22493dad966305a7fb555addd367532dd2af275a27San Mehat#include <string.h> 23493dad966305a7fb555addd367532dd2af275a27San Mehat#include <errno.h> 24493dad966305a7fb555addd367532dd2af275a27San Mehat#include <fcntl.h> 250384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 26d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#define LOG_TAG "SchedPolicy" 27d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#include "cutils/log.h" 28d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 290384a98d6f61fa47ffde01c15e552f738e88fb94Raphael#ifdef HAVE_SCHED_H 3086b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#ifdef HAVE_PTHREADS 310384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 32493dad966305a7fb555addd367532dd2af275a27San Mehat#include <sched.h> 3386b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#include <pthread.h> 34493dad966305a7fb555addd367532dd2af275a27San Mehat 35493dad966305a7fb555addd367532dd2af275a27San Mehat#include <cutils/sched_policy.h> 36493dad966305a7fb555addd367532dd2af275a27San Mehat 373cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#ifndef SCHED_NORMAL 383cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat #define SCHED_NORMAL 0 393cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#endif 403cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 413cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#ifndef SCHED_BATCH 423cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat #define SCHED_BATCH 3 433cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat#endif 443cd5b66ba05cffe38bfa4e2da9b93292ba0b073aSan Mehat 45805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat#define POLICY_DEBUG 0 46d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 47e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic pthread_once_t the_once = PTHREAD_ONCE_INIT; 48e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 49c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int __sys_supports_schedgroups = -1; 50c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 51e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. 52e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int normal_cgroup_fd = -1; 53e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int bg_cgroup_fd = -1; 54e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 55e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick/* Add tid to the scheduling group defined by the policy */ 56e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic int add_tid_to_cgroup(int tid, SchedPolicy policy) 57493dad966305a7fb555addd367532dd2af275a27San Mehat{ 58493dad966305a7fb555addd367532dd2af275a27San Mehat int fd; 59e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 60e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (policy == SP_BACKGROUND) { 61e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick fd = bg_cgroup_fd; 62e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 63e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick fd = normal_cgroup_fd; 64e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 65e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 66e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (fd < 0) { 67e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("add_tid_to_cgroup failed; background=%d\n", 68e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick policy == SP_BACKGROUND ? 1 : 0); 69493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 70805d67ab11c1bb21d494459d6167f5f67f0002ebSan Mehat } 71493dad966305a7fb555addd367532dd2af275a27San Mehat 72253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick // specialized itoa -- works for tid > 0 73253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char text[22]; 74253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *end = text + sizeof(text) - 1; 75253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick char *ptr = end; 76253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *ptr = '\0'; 77253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick while (tid > 0) { 78253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick *--ptr = '0' + (tid % 10); 79253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick tid = tid / 10; 80253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick } 81253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick 82253e27acb6c9e3e0b03c59f25cdf9ecbd64bcdadBrad Fitzpatrick if (write(fd, ptr, end - ptr) < 0) { 83e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick /* 84e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * If the thread is in the process of exiting, 85e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick * don't flag an error 86e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick */ 87e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (errno == ESRCH) 88e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick return 0; 89e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGW("add_tid_to_cgroup failed to write '%s' (%s); background=%d\n", 90e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick ptr, strerror(errno), policy == SP_BACKGROUND ? 1 : 0); 91493dad966305a7fb555addd367532dd2af275a27San Mehat return -1; 92493dad966305a7fb555addd367532dd2af275a27San Mehat } 93493dad966305a7fb555addd367532dd2af275a27San Mehat 94493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 95493dad966305a7fb555addd367532dd2af275a27San Mehat} 96493dad966305a7fb555addd367532dd2af275a27San Mehat 97e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrickstatic void __initialize(void) { 98e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick char* filename; 99e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (!access("/dev/cpuctl/tasks", F_OK)) { 100e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 1; 101e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 102e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/tasks"; 103e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick normal_cgroup_fd = open(filename, O_WRONLY); 104e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (normal_cgroup_fd < 0) { 105e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 106e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } 107e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick 108e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick filename = "/dev/cpuctl/bg_non_interactive/tasks"; 109e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick bg_cgroup_fd = open(filename, O_WRONLY); 110e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (bg_cgroup_fd < 0) { 111e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick SLOGE("open of %s failed: %s\n", filename, strerror(errno)); 112493dad966305a7fb555addd367532dd2af275a27San Mehat } 113e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick } else { 114e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick __sys_supports_schedgroups = 0; 115493dad966305a7fb555addd367532dd2af275a27San Mehat } 116c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 117c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 118c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat/* 119c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * Try to get the scheduler group. 120c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 121503df2075991cd03ddf43d14e05768a2138b9028San Mehat * The data from /proc/<pid>/cgroup looks (something) like: 122c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 2:cpu:/bg_non_interactive 123503df2075991cd03ddf43d14e05768a2138b9028San Mehat * 1:cpuacct:/ 124c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * 125c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * We return the part after the "/", which will be an empty string for 126c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * the default cgroup. If the string is longer than "bufLen", the string 127c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat * will be truncated. 128c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat */ 129c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatstatic int getSchedulerGroup(int tid, char* buf, size_t bufLen) 130c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 131c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#ifdef HAVE_ANDROID_OS 132c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char pathBuf[32]; 133503df2075991cd03ddf43d14e05768a2138b9028San Mehat char lineBuf[256]; 134503df2075991cd03ddf43d14e05768a2138b9028San Mehat FILE *fp; 135c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 136c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); 137503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(fp = fopen(pathBuf, "r"))) { 138c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 139c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 140c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 141503df2075991cd03ddf43d14e05768a2138b9028San Mehat while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { 142503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *next = lineBuf; 143503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *subsys; 144503df2075991cd03ddf43d14e05768a2138b9028San Mehat char *grp; 145503df2075991cd03ddf43d14e05768a2138b9028San Mehat size_t len; 146c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 147503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Junk the first field */ 148503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!strsep(&next, ":")) { 149503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 150503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 151c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 152503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(subsys = strsep(&next, ":"))) { 153503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 154503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 155503df2075991cd03ddf43d14e05768a2138b9028San Mehat 156503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (strcmp(subsys, "cpu")) { 157503df2075991cd03ddf43d14e05768a2138b9028San Mehat /* Not the subsys we're looking for */ 158503df2075991cd03ddf43d14e05768a2138b9028San Mehat continue; 159503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 160503df2075991cd03ddf43d14e05768a2138b9028San Mehat 161503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (!(grp = strsep(&next, ":"))) { 162503df2075991cd03ddf43d14e05768a2138b9028San Mehat goto out_bad_data; 163503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 164503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp++; /* Drop the leading '/' */ 165503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = strlen(grp); 166503df2075991cd03ddf43d14e05768a2138b9028San Mehat grp[len-1] = '\0'; /* Drop the trailing '\n' */ 167503df2075991cd03ddf43d14e05768a2138b9028San Mehat 168503df2075991cd03ddf43d14e05768a2138b9028San Mehat if (bufLen <= len) { 169503df2075991cd03ddf43d14e05768a2138b9028San Mehat len = bufLen - 1; 170503df2075991cd03ddf43d14e05768a2138b9028San Mehat } 171503df2075991cd03ddf43d14e05768a2138b9028San Mehat strncpy(buf, grp, len); 172503df2075991cd03ddf43d14e05768a2138b9028San Mehat buf[len] = '\0'; 173503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 174503df2075991cd03ddf43d14e05768a2138b9028San Mehat return 0; 175c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 176c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 1777e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Failed to find cpu subsys"); 178503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 179503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 180503df2075991cd03ddf43d14e05768a2138b9028San Mehat out_bad_data: 1817e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGE("Bad cgroup data {%s}", lineBuf); 182503df2075991cd03ddf43d14e05768a2138b9028San Mehat fclose(fp); 183503df2075991cd03ddf43d14e05768a2138b9028San Mehat return -1; 184c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#else 185c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ENOSYS; 186c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 187c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat#endif 188c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 189c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 190c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint get_sched_policy(int tid, SchedPolicy *policy) 191c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 192e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 193c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 194c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (__sys_supports_schedgroups) { 195c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat char grpBuf[32]; 196c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) 197c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 198c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (grpBuf[0] == '\0') { 199c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 200c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else if (!strcmp(grpBuf, "bg_non_interactive")) { 201c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 202c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 203c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 204c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 205c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 206c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } else { 207c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat int rc = sched_getscheduler(tid); 208c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat if (rc < 0) 209c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 210c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_NORMAL) 211c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_FOREGROUND; 212c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else if (rc == SCHED_BATCH) 213c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat *policy = SP_BACKGROUND; 214c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat else { 215c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat errno = ERANGE; 216c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return -1; 217c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 218c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat } 219c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat return 0; 220c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat} 221c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat 222c0dfca7ae1f6016461235552091c2cacacca82a2San Mehatint set_sched_policy(int tid, SchedPolicy policy) 223c0dfca7ae1f6016461235552091c2cacacca82a2San Mehat{ 224e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick pthread_once(&the_once, __initialize); 225493dad966305a7fb555addd367532dd2af275a27San Mehat 226d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#if POLICY_DEBUG 227d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statfile[64]; 228d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char statline[1024]; 229d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char thread_name[255]; 230d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int fd; 231d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 232d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat sprintf(statfile, "/proc/%d/stat", tid); 233d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat memset(thread_name, 0, sizeof(thread_name)); 234d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 235d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat fd = open(statfile, O_RDONLY); 236d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (fd >= 0) { 237d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat int rc = read(fd, statline, 1023); 238d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat close(fd); 239d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat statline[rc] = 0; 240d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *p = statline; 241d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat char *q; 242d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 243d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (p = statline; *p != '('; p++); 244d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat p++; 245d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat for (q = p; *q != ')'; q++); 246d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 247d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat strncpy(thread_name, p, (q-p)); 248d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 249d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat if (policy == SP_BACKGROUND) { 2507e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("vvv tid %d (%s)", tid, thread_name); 251d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } else if (policy == SP_FOREGROUND) { 2527e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("^^^ tid %d (%s)", tid, thread_name); 253d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } else { 2547e8529a8b528fd30586aa037f15a31b29582c537San Mehat SLOGD("??? tid %d (%s)", tid, thread_name); 255d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat } 256d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat#endif 257d2e4e46ce4bc29c3328fccfbbbe0590eaa8713f7San Mehat 258493dad966305a7fb555addd367532dd2af275a27San Mehat if (__sys_supports_schedgroups) { 259e43c248316d0faa7bdc23de823b068c2aa3520abBrad Fitzpatrick if (add_tid_to_cgroup(tid, policy)) { 260493dad966305a7fb555addd367532dd2af275a27San Mehat if (errno != ESRCH && errno != ENOENT) 261493dad966305a7fb555addd367532dd2af275a27San Mehat return -errno; 262493dad966305a7fb555addd367532dd2af275a27San Mehat } 263493dad966305a7fb555addd367532dd2af275a27San Mehat } else { 264493dad966305a7fb555addd367532dd2af275a27San Mehat struct sched_param param; 265493dad966305a7fb555addd367532dd2af275a27San Mehat 266493dad966305a7fb555addd367532dd2af275a27San Mehat param.sched_priority = 0; 267493dad966305a7fb555addd367532dd2af275a27San Mehat sched_setscheduler(tid, 268493dad966305a7fb555addd367532dd2af275a27San Mehat (policy == SP_BACKGROUND) ? 269493dad966305a7fb555addd367532dd2af275a27San Mehat SCHED_BATCH : SCHED_NORMAL, 270493dad966305a7fb555addd367532dd2af275a27San Mehat ¶m); 271493dad966305a7fb555addd367532dd2af275a27San Mehat } 272493dad966305a7fb555addd367532dd2af275a27San Mehat 273493dad966305a7fb555addd367532dd2af275a27San Mehat return 0; 274493dad966305a7fb555addd367532dd2af275a27San Mehat} 2750384a98d6f61fa47ffde01c15e552f738e88fb94Raphael 27686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kastenconst char *get_sched_policy_name(SchedPolicy policy) 27786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten{ 27886c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten static const char * const strings[SP_CNT] = { 27986c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_BACKGROUND] = "bg", 28086c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten [SP_FOREGROUND] = "fg", 28186c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten }; 28286c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten if ((policy < SP_CNT) && (strings[policy] != NULL)) 28386c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return strings[policy]; 28486c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten else 28586c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten return "error"; 28686c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten} 28786c7cc81891a69ace7044de667b0624c284ee82bGlenn Kasten 28886b121523d7d3634bf5ac07b6e238b36b3e75f0aBrad Fitzpatrick#endif /* HAVE_PTHREADS */ 2890384a98d6f61fa47ffde01c15e552f738e88fb94Raphael#endif /* HAVE_SCHED_H */ 290