int set_cpuset_policy(int tid, SchedPolicy policy)
{
// in the absence of cpusets, use the old sched policy
#ifndef USE_CPUSETS
return set_sched_policy(tid, policy);
#else
if (tid == 0) {
tid = gettid();
}
policy = _policy(policy);
pthread_once(&the_once, __initialize);
int fd = -1;
int boost_fd = -1;
switch (policy) {
case SP_BACKGROUND:
fd = bg_cpuset_fd;
boost_fd = bg_schedboost_fd;
break;
case SP_FOREGROUND:
case SP_AUDIO_APP:
case SP_AUDIO_SYS:
fd = fg_cpuset_fd;
boost_fd = fg_schedboost_fd;
break;
case SP_TOP_APP :
fd = ta_cpuset_fd;
boost_fd = fg_schedboost_fd;
break;
case SP_SYSTEM:
fd = system_bg_cpuset_fd;
boost_fd = bg_schedboost_fd;
break;
default:
boost_fd = fd = -1;
break;
}
if (add_tid_to_cgroup(tid, fd) != 0) {
if (errno != ESRCH && errno != ENOENT)
return -errno;
}
if (boost_fd > 0 && add_tid_to_cgroup(tid, boost_fd) != 0) {
if (errno != ESRCH && errno != ENOENT)
return -errno;
}
return 0;
#endif
}
int set_sched_policy(int tid, SchedPolicy policy)
{
initialize();
#if POLICY_DEBUG
char statfile[64];
char statline[1024];
char thread_name[255];
int fd;
sprintf(statfile, "/proc/%d/stat", tid);
memset(thread_name, 0, sizeof(thread_name));
fd = open(statfile, O_RDONLY);
if (fd >= 0) {
int rc = read(fd, statline, 1023);
close(fd);
statline[rc] = 0;
char *p = statline;
char *q;
for (p = statline; *p != '('; p++);
p++;
for (q = p; *q != ')'; q++);
strncpy(thread_name, p, (q-p));
}
if (policy == SP_BACKGROUND) {
LOGD("vvv tid %d (%s)", tid, thread_name);
} else if (policy == SP_FOREGROUND) {
LOGD("^^^ tid %d (%s)", tid, thread_name);
} else {
LOGD("??? tid %d (%s)", tid, thread_name);
}
#endif
if (__sys_supports_schedgroups) {
const char *grp = "";
if (policy == SP_BACKGROUND) {
grp = "bg_non_interactive";
}
if (add_tid_to_cgroup(tid, grp)) {
if (errno != ESRCH && errno != ENOENT)
return -errno;
}
} else {
struct sched_param param;
param.sched_priority = 0;
sched_setscheduler(tid,
(policy == SP_BACKGROUND) ?
SCHED_BATCH : SCHED_NORMAL,
¶m);
}
return 0;
}
int set_sched_policy(int tid, SchedPolicy policy)
{
if (tid == 0) {
tid = gettid();
}
policy = _policy(policy);
pthread_once(&the_once, __initialize);
#if POLICY_DEBUG
char statfile[64];
char statline[1024];
char thread_name[255];
int fd;
sprintf(statfile, "/proc/%d/stat", tid);
memset(thread_name, 0, sizeof(thread_name));
fd = open(statfile, O_RDONLY);
if (fd >= 0) {
int rc = read(fd, statline, 1023);
close(fd);
statline[rc] = 0;
char *p = statline;
char *q;
for (p = statline; *p != '('; p++);
p++;
for (q = p; *q != ')'; q++);
strncpy(thread_name, p, (q-p));
}
switch (policy) {
case SP_BACKGROUND:
SLOGD("vvv tid %d (%s)", tid, thread_name);
break;
case SP_FOREGROUND:
case SP_AUDIO_APP:
case SP_AUDIO_SYS:
case SP_TOP_APP:
SLOGD("^^^ tid %d (%s)", tid, thread_name);
break;
case SP_SYSTEM:
SLOGD("/// tid %d (%s)", tid, thread_name);
break;
default:
SLOGD("??? tid %d (%s)", tid, thread_name);
break;
}
#endif
if (__sys_supports_schedgroups) {
int fd;
switch (policy) {
case SP_BACKGROUND:
fd = bg_cgroup_fd;
break;
case SP_FOREGROUND:
case SP_AUDIO_APP:
case SP_AUDIO_SYS:
case SP_TOP_APP:
fd = fg_cgroup_fd;
break;
default:
fd = -1;
break;
}
if (add_tid_to_cgroup(tid, fd) != 0) {
if (errno != ESRCH && errno != ENOENT)
return -errno;
}
} else {
struct sched_param param;
param.sched_priority = 0;
sched_setscheduler(tid,
(policy == SP_BACKGROUND) ?
SCHED_BATCH : SCHED_NORMAL,
¶m);
}
prctl(PR_SET_TIMERSLACK_PID,
policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG, tid);
return 0;
}