openkylin
/
platform_system_core
mirror of https://gitee.com/openkylin/platform_system_core.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge "Remove the prctl PR_SET_TIMERSLACK_PID call."

This commit is contained in:
Treehugger Robot 2016-08-04 02:29:16 +00:00 committed by Gerrit Code Review
parent 077135b18c d7967c1347
commit b3654fa086
1 changed files with 2 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
libcutils/sched_policy.c
View File

@ -45,9 +45,6 @@ static inline SchedPolicy _policy(SchedPolicy p)
#define POLICY_DEBUG 0
// This prctl is only available in Android kernels.
#define PR_SET_TIMERSLACK_PID 41
// timer slack value in nS enforced when the thread moves to background
#define TIMER_SLACK_BG 40000000
#define TIMER_SLACK_FG 50000
@ -293,9 +290,9 @@ int set_cpuset_policy(int tid, SchedPolicy policy)
}
static void set_timerslack_ns(int tid, unsigned long long slack) {
// v4.6+ kernels support the /proc/<tid>/timerslack_ns interface.
// TODO: once we've backported this, log if the open(2) fails.
char buf[64];
/* v4.6+ kernels support the /proc/<tid>/timerslack_ns interface. */
snprintf(buf, sizeof(buf), "/proc/%d/timerslack_ns", tid);
int fd = open(buf, O_WRONLY | O_CLOEXEC);
if (fd != -1) {
@ -306,11 +303,6 @@ static void set_timerslack_ns(int tid, unsigned long long slack) {
close(fd);
return;
}
/* If the above fails, try the old common.git PR_SET_TIMERSLACK_PID. */
if (prctl(PR_SET_TIMERSLACK_PID, slack, tid) == -1) {
SLOGE("set_timerslack_ns prctl failed: %s\n", strerror(errno));
}
}
int set_sched_policy(int tid, SchedPolicy policy)