Mark Salyzyn | 1271716 | 2014-04-29 15:49:14 -0700 | [diff] [blame] | 1 | /* |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 2 | ** Copyright 2007, The Android Open Source Project |
| 3 | ** |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 4 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | ** you may not use this file except in compliance with the License. |
| 6 | ** You may obtain a copy of the License at |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 7 | ** |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 8 | ** http://www.apache.org/licenses/LICENSE-2.0 |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 9 | ** |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 10 | ** Unless required by applicable law or agreed to in writing, software |
| 11 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | ** See the License for the specific language governing permissions and |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 14 | ** limitations under the License. |
| 15 | */ |
| 16 | |
Jeff Brown | bff8f3f | 2012-05-08 15:05:42 -0700 | [diff] [blame] | 17 | #define LOG_TAG "SchedPolicy" |
| 18 | |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 19 | #include <errno.h> |
| 20 | #include <fcntl.h> |
Mark Salyzyn | 1271716 | 2014-04-29 15:49:14 -0700 | [diff] [blame] | 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <unistd.h> |
| 25 | |
Jeff Brown | bff8f3f | 2012-05-08 15:05:42 -0700 | [diff] [blame] | 26 | #include <cutils/sched_policy.h> |
Mark Salyzyn | 1271716 | 2014-04-29 15:49:14 -0700 | [diff] [blame] | 27 | #include <log/log.h> |
| 28 | |
| 29 | #define UNUSED __attribute__((__unused__)) |
Raphael | 0384a98 | 2009-09-15 17:10:17 -0700 | [diff] [blame] | 30 | |
Jeff Brown | bff8f3f | 2012-05-08 15:05:42 -0700 | [diff] [blame] | 31 | /* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged. |
| 32 | * Call this any place a SchedPolicy is used as an input parameter. |
| 33 | * Returns the possibly re-mapped policy. |
| 34 | */ |
| 35 | static inline SchedPolicy _policy(SchedPolicy p) |
| 36 | { |
| 37 | return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p; |
| 38 | } |
San Mehat | d2e4e46 | 2009-10-29 11:48:00 -0700 | [diff] [blame] | 39 | |
Elliott Hughes | 6acf3d7 | 2014-12-14 16:51:36 -0800 | [diff] [blame] | 40 | #if defined(HAVE_ANDROID_OS) |
Raphael | 0384a98 | 2009-09-15 17:10:17 -0700 | [diff] [blame] | 41 | |
Brad Fitzpatrick | 86b1215 | 2010-05-08 11:51:13 -0700 | [diff] [blame] | 42 | #include <pthread.h> |
Elliott Hughes | e07d77e | 2014-07-11 20:57:03 -0700 | [diff] [blame] | 43 | #include <sched.h> |
| 44 | #include <sys/prctl.h> |
San Mehat | 3cd5b66 | 2009-09-14 16:05:24 -0700 | [diff] [blame] | 45 | |
San Mehat | 805d67a | 2009-10-29 13:56:26 -0700 | [diff] [blame] | 46 | #define POLICY_DEBUG 0 |
San Mehat | d2e4e46 | 2009-10-29 11:48:00 -0700 | [diff] [blame] | 47 | |
Elliott Hughes | 400c381 | 2014-07-17 17:15:14 -0700 | [diff] [blame] | 48 | // This prctl is only available in Android kernels. |
| 49 | #define PR_SET_TIMERSLACK_PID 41 |
| 50 | |
Ruchi Kandoi | 422852e | 2014-04-22 18:55:08 -0700 | [diff] [blame] | 51 | // timer slack value in nS enforced when the thread moves to background |
| 52 | #define TIMER_SLACK_BG 40000000 |
Todd Kjos | 4cdce42 | 2015-06-25 13:08:14 -0700 | [diff] [blame] | 53 | #define TIMER_SLACK_FG 50000 |
Ruchi Kandoi | 422852e | 2014-04-22 18:55:08 -0700 | [diff] [blame] | 54 | |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 55 | static pthread_once_t the_once = PTHREAD_ONCE_INIT; |
| 56 | |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 57 | static int __sys_supports_schedgroups = -1; |
| 58 | |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 59 | // File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error. |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 60 | static int bg_cgroup_fd = -1; |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 61 | static int fg_cgroup_fd = -1; |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 62 | |
Elliott Hughes | 919bb66 | 2015-07-24 20:28:31 -0700 | [diff] [blame^] | 63 | #ifdef USE_CPUSETS |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 64 | // File descriptors open to /dev/cpuset/../tasks, setup by initialize, or -1 on error |
| 65 | static int bg_cpuset_fd = -1; |
| 66 | static int fg_cpuset_fd = -1; |
Elliott Hughes | 919bb66 | 2015-07-24 20:28:31 -0700 | [diff] [blame^] | 67 | #endif |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 68 | |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 69 | /* Add tid to the scheduling group defined by the policy */ |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 70 | static int add_tid_to_cgroup(int tid, int fd) |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 71 | { |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 72 | if (fd < 0) { |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 73 | SLOGE("add_tid_to_cgroup failed; fd=%d\n", fd); |
| 74 | errno = EINVAL; |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 75 | return -1; |
San Mehat | 805d67a | 2009-10-29 13:56:26 -0700 | [diff] [blame] | 76 | } |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 77 | |
Brad Fitzpatrick | 253e27a | 2010-05-06 10:00:37 -0700 | [diff] [blame] | 78 | // specialized itoa -- works for tid > 0 |
| 79 | char text[22]; |
| 80 | char *end = text + sizeof(text) - 1; |
| 81 | char *ptr = end; |
| 82 | *ptr = '\0'; |
| 83 | while (tid > 0) { |
| 84 | *--ptr = '0' + (tid % 10); |
| 85 | tid = tid / 10; |
| 86 | } |
| 87 | |
| 88 | if (write(fd, ptr, end - ptr) < 0) { |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 89 | /* |
| 90 | * If the thread is in the process of exiting, |
| 91 | * don't flag an error |
| 92 | */ |
| 93 | if (errno == ESRCH) |
| 94 | return 0; |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 95 | SLOGW("add_tid_to_cgroup failed to write '%s' (%s); fd=%d\n", |
| 96 | ptr, strerror(errno), fd); |
| 97 | errno = EINVAL; |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 98 | return -1; |
| 99 | } |
| 100 | |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 101 | return 0; |
| 102 | } |
| 103 | |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 104 | static void __initialize(void) { |
| 105 | char* filename; |
| 106 | if (!access("/dev/cpuctl/tasks", F_OK)) { |
| 107 | __sys_supports_schedgroups = 1; |
| 108 | |
| 109 | filename = "/dev/cpuctl/tasks"; |
Jeff Brown | 5b878d2 | 2012-05-08 15:07:58 -0700 | [diff] [blame] | 110 | fg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 111 | if (fg_cgroup_fd < 0) { |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 112 | SLOGE("open of %s failed: %s\n", filename, strerror(errno)); |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 113 | } |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 114 | |
Riley Andrews | 522d72b | 2014-10-03 17:02:53 -0700 | [diff] [blame] | 115 | filename = "/dev/cpuctl/bg_non_interactive/tasks"; |
Jeff Brown | 5b878d2 | 2012-05-08 15:07:58 -0700 | [diff] [blame] | 116 | bg_cgroup_fd = open(filename, O_WRONLY | O_CLOEXEC); |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 117 | if (bg_cgroup_fd < 0) { |
| 118 | SLOGE("open of %s failed: %s\n", filename, strerror(errno)); |
| 119 | } |
| 120 | } else { |
| 121 | __sys_supports_schedgroups = 0; |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 122 | } |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 123 | |
| 124 | #ifdef USE_CPUSETS |
| 125 | if (!access("/dev/cpuset/tasks", F_OK)) { |
| 126 | |
| 127 | filename = "/dev/cpuset/foreground/tasks"; |
| 128 | fg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); |
| 129 | filename = "/dev/cpuset/background/tasks"; |
| 130 | bg_cpuset_fd = open(filename, O_WRONLY | O_CLOEXEC); |
| 131 | } |
| 132 | #endif |
| 133 | |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Try to get the scheduler group. |
| 138 | * |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 139 | * The data from /proc/<pid>/cgroup looks (something) like: |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 140 | * 2:cpu:/bg_non_interactive |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 141 | * 1:cpuacct:/ |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 142 | * |
| 143 | * We return the part after the "/", which will be an empty string for |
| 144 | * the default cgroup. If the string is longer than "bufLen", the string |
| 145 | * will be truncated. |
| 146 | */ |
| 147 | static int getSchedulerGroup(int tid, char* buf, size_t bufLen) |
| 148 | { |
| 149 | #ifdef HAVE_ANDROID_OS |
| 150 | char pathBuf[32]; |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 151 | char lineBuf[256]; |
| 152 | FILE *fp; |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 153 | |
| 154 | snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid); |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 155 | if (!(fp = fopen(pathBuf, "r"))) { |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 156 | return -1; |
| 157 | } |
| 158 | |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 159 | while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) { |
| 160 | char *next = lineBuf; |
| 161 | char *subsys; |
| 162 | char *grp; |
| 163 | size_t len; |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 164 | |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 165 | /* Junk the first field */ |
| 166 | if (!strsep(&next, ":")) { |
| 167 | goto out_bad_data; |
| 168 | } |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 169 | |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 170 | if (!(subsys = strsep(&next, ":"))) { |
| 171 | goto out_bad_data; |
| 172 | } |
| 173 | |
| 174 | if (strcmp(subsys, "cpu")) { |
| 175 | /* Not the subsys we're looking for */ |
| 176 | continue; |
| 177 | } |
| 178 | |
| 179 | if (!(grp = strsep(&next, ":"))) { |
| 180 | goto out_bad_data; |
| 181 | } |
| 182 | grp++; /* Drop the leading '/' */ |
| 183 | len = strlen(grp); |
| 184 | grp[len-1] = '\0'; /* Drop the trailing '\n' */ |
| 185 | |
| 186 | if (bufLen <= len) { |
| 187 | len = bufLen - 1; |
| 188 | } |
| 189 | strncpy(buf, grp, len); |
| 190 | buf[len] = '\0'; |
| 191 | fclose(fp); |
| 192 | return 0; |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 193 | } |
| 194 | |
San Mehat | 7e8529a | 2010-03-25 09:31:42 -0700 | [diff] [blame] | 195 | SLOGE("Failed to find cpu subsys"); |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 196 | fclose(fp); |
| 197 | return -1; |
| 198 | out_bad_data: |
San Mehat | 7e8529a | 2010-03-25 09:31:42 -0700 | [diff] [blame] | 199 | SLOGE("Bad cgroup data {%s}", lineBuf); |
San Mehat | 503df20 | 2010-03-02 17:09:56 -0800 | [diff] [blame] | 200 | fclose(fp); |
| 201 | return -1; |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 202 | #else |
| 203 | errno = ENOSYS; |
| 204 | return -1; |
| 205 | #endif |
| 206 | } |
| 207 | |
| 208 | int get_sched_policy(int tid, SchedPolicy *policy) |
| 209 | { |
Glenn Kasten | 69bfb1f | 2012-03-16 09:43:19 -0700 | [diff] [blame] | 210 | if (tid == 0) { |
| 211 | tid = gettid(); |
| 212 | } |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 213 | pthread_once(&the_once, __initialize); |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 214 | |
| 215 | if (__sys_supports_schedgroups) { |
| 216 | char grpBuf[32]; |
| 217 | if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0) |
| 218 | return -1; |
| 219 | if (grpBuf[0] == '\0') { |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 220 | *policy = SP_FOREGROUND; |
Riley Andrews | 522d72b | 2014-10-03 17:02:53 -0700 | [diff] [blame] | 221 | } else if (!strcmp(grpBuf, "bg_non_interactive")) { |
| 222 | *policy = SP_BACKGROUND; |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 223 | } else { |
| 224 | errno = ERANGE; |
| 225 | return -1; |
| 226 | } |
| 227 | } else { |
| 228 | int rc = sched_getscheduler(tid); |
| 229 | if (rc < 0) |
| 230 | return -1; |
| 231 | else if (rc == SCHED_NORMAL) |
| 232 | *policy = SP_FOREGROUND; |
| 233 | else if (rc == SCHED_BATCH) |
| 234 | *policy = SP_BACKGROUND; |
| 235 | else { |
| 236 | errno = ERANGE; |
| 237 | return -1; |
| 238 | } |
| 239 | } |
| 240 | return 0; |
| 241 | } |
| 242 | |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 243 | int set_cpuset_policy(int tid, SchedPolicy policy) |
| 244 | { |
| 245 | // in the absence of cpusets, use the old sched policy |
| 246 | #ifndef USE_CPUSETS |
| 247 | return set_sched_policy(tid, policy); |
| 248 | #else |
| 249 | if (tid == 0) { |
| 250 | tid = gettid(); |
| 251 | } |
| 252 | policy = _policy(policy); |
| 253 | pthread_once(&the_once, __initialize); |
| 254 | |
| 255 | int fd; |
| 256 | switch (policy) { |
| 257 | case SP_BACKGROUND: |
| 258 | fd = bg_cpuset_fd; |
| 259 | break; |
| 260 | case SP_FOREGROUND: |
| 261 | case SP_AUDIO_APP: |
| 262 | case SP_AUDIO_SYS: |
| 263 | fd = fg_cpuset_fd; |
| 264 | break; |
| 265 | default: |
| 266 | fd = -1; |
| 267 | break; |
| 268 | } |
| 269 | |
| 270 | if (add_tid_to_cgroup(tid, fd) != 0) { |
| 271 | if (errno != ESRCH && errno != ENOENT) |
| 272 | return -errno; |
| 273 | } |
| 274 | |
Tim Murray | 9991026 | 2015-06-22 14:00:56 -0700 | [diff] [blame] | 275 | return 0; |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 276 | #endif |
| 277 | } |
| 278 | |
San Mehat | c0dfca7 | 2009-10-27 11:52:55 -0700 | [diff] [blame] | 279 | int set_sched_policy(int tid, SchedPolicy policy) |
| 280 | { |
Glenn Kasten | 69bfb1f | 2012-03-16 09:43:19 -0700 | [diff] [blame] | 281 | if (tid == 0) { |
| 282 | tid = gettid(); |
| 283 | } |
Glenn Kasten | 69bfb1f | 2012-03-16 09:43:19 -0700 | [diff] [blame] | 284 | policy = _policy(policy); |
Brad Fitzpatrick | e43c248 | 2010-05-07 12:06:05 -0700 | [diff] [blame] | 285 | pthread_once(&the_once, __initialize); |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 286 | |
San Mehat | d2e4e46 | 2009-10-29 11:48:00 -0700 | [diff] [blame] | 287 | #if POLICY_DEBUG |
| 288 | char statfile[64]; |
| 289 | char statline[1024]; |
| 290 | char thread_name[255]; |
| 291 | int fd; |
| 292 | |
| 293 | sprintf(statfile, "/proc/%d/stat", tid); |
| 294 | memset(thread_name, 0, sizeof(thread_name)); |
| 295 | |
| 296 | fd = open(statfile, O_RDONLY); |
| 297 | if (fd >= 0) { |
| 298 | int rc = read(fd, statline, 1023); |
| 299 | close(fd); |
| 300 | statline[rc] = 0; |
| 301 | char *p = statline; |
| 302 | char *q; |
| 303 | |
| 304 | for (p = statline; *p != '('; p++); |
| 305 | p++; |
| 306 | for (q = p; *q != ')'; q++); |
| 307 | |
| 308 | strncpy(thread_name, p, (q-p)); |
| 309 | } |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 310 | switch (policy) { |
| 311 | case SP_BACKGROUND: |
San Mehat | 7e8529a | 2010-03-25 09:31:42 -0700 | [diff] [blame] | 312 | SLOGD("vvv tid %d (%s)", tid, thread_name); |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 313 | break; |
| 314 | case SP_FOREGROUND: |
Dima Zavin | 29319a6 | 2012-06-04 13:14:36 -0700 | [diff] [blame] | 315 | case SP_AUDIO_APP: |
| 316 | case SP_AUDIO_SYS: |
San Mehat | 7e8529a | 2010-03-25 09:31:42 -0700 | [diff] [blame] | 317 | SLOGD("^^^ tid %d (%s)", tid, thread_name); |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 318 | break; |
| 319 | case SP_SYSTEM: |
| 320 | SLOGD("/// tid %d (%s)", tid, thread_name); |
| 321 | break; |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 322 | default: |
San Mehat | 7e8529a | 2010-03-25 09:31:42 -0700 | [diff] [blame] | 323 | SLOGD("??? tid %d (%s)", tid, thread_name); |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 324 | break; |
San Mehat | d2e4e46 | 2009-10-29 11:48:00 -0700 | [diff] [blame] | 325 | } |
| 326 | #endif |
| 327 | |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 328 | if (__sys_supports_schedgroups) { |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 329 | int fd; |
| 330 | switch (policy) { |
| 331 | case SP_BACKGROUND: |
| 332 | fd = bg_cgroup_fd; |
| 333 | break; |
| 334 | case SP_FOREGROUND: |
| 335 | case SP_AUDIO_APP: |
| 336 | case SP_AUDIO_SYS: |
| 337 | fd = fg_cgroup_fd; |
| 338 | break; |
| 339 | default: |
| 340 | fd = -1; |
| 341 | break; |
| 342 | } |
| 343 | |
| 344 | |
| 345 | if (add_tid_to_cgroup(tid, fd) != 0) { |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 346 | if (errno != ESRCH && errno != ENOENT) |
| 347 | return -errno; |
| 348 | } |
| 349 | } else { |
| 350 | struct sched_param param; |
| 351 | |
| 352 | param.sched_priority = 0; |
| 353 | sched_setscheduler(tid, |
| 354 | (policy == SP_BACKGROUND) ? |
Tim Murray | b769c8d | 2015-06-08 14:56:29 -0700 | [diff] [blame] | 355 | SCHED_BATCH : SCHED_NORMAL, |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 356 | ¶m); |
| 357 | } |
| 358 | |
Todd Kjos | 4cdce42 | 2015-06-25 13:08:14 -0700 | [diff] [blame] | 359 | prctl(PR_SET_TIMERSLACK_PID, |
| 360 | policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG, tid); |
Ruchi Kandoi | 422852e | 2014-04-22 18:55:08 -0700 | [diff] [blame] | 361 | |
San Mehat | 493dad9 | 2009-09-12 10:06:57 -0700 | [diff] [blame] | 362 | return 0; |
| 363 | } |
Raphael | 0384a98 | 2009-09-15 17:10:17 -0700 | [diff] [blame] | 364 | |
Jeff Brown | bff8f3f | 2012-05-08 15:05:42 -0700 | [diff] [blame] | 365 | #else |
| 366 | |
| 367 | /* Stubs for non-Android targets. */ |
| 368 | |
Mark Salyzyn | 1271716 | 2014-04-29 15:49:14 -0700 | [diff] [blame] | 369 | int set_sched_policy(int tid UNUSED, SchedPolicy policy UNUSED) |
Jeff Brown | bff8f3f | 2012-05-08 15:05:42 -0700 | [diff] [blame] | 370 | { |
| 371 | return 0; |
| 372 | } |
| 373 | |
Mark Salyzyn | 1271716 | 2014-04-29 15:49:14 -0700 | [diff] [blame] | 374 | int get_sched_policy(int tid UNUSED, SchedPolicy *policy) |
Jeff Brown | bff8f3f | 2012-05-08 15:05:42 -0700 | [diff] [blame] | 375 | { |
| 376 | *policy = SP_SYSTEM_DEFAULT; |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | #endif |
| 381 | |
Glenn Kasten | 86c7cc8 | 2012-03-05 16:14:39 -0800 | [diff] [blame] | 382 | const char *get_sched_policy_name(SchedPolicy policy) |
| 383 | { |
Glenn Kasten | 69bfb1f | 2012-03-16 09:43:19 -0700 | [diff] [blame] | 384 | policy = _policy(policy); |
Glenn Kasten | 86c7cc8 | 2012-03-05 16:14:39 -0800 | [diff] [blame] | 385 | static const char * const strings[SP_CNT] = { |
| 386 | [SP_BACKGROUND] = "bg", |
| 387 | [SP_FOREGROUND] = "fg", |
Glenn Kasten | 10ec3c7 | 2012-04-19 15:25:58 -0700 | [diff] [blame] | 388 | [SP_SYSTEM] = " ", |
| 389 | [SP_AUDIO_APP] = "aa", |
| 390 | [SP_AUDIO_SYS] = "as", |
Glenn Kasten | 86c7cc8 | 2012-03-05 16:14:39 -0800 | [diff] [blame] | 391 | }; |
| 392 | if ((policy < SP_CNT) && (strings[policy] != NULL)) |
| 393 | return strings[policy]; |
| 394 | else |
| 395 | return "error"; |
| 396 | } |