diff options
Diffstat (limited to 'libcutils/sched_policy.cpp')
| -rw-r--r-- | libcutils/sched_policy.cpp | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/libcutils/sched_policy.cpp b/libcutils/sched_policy.cpp index 217733a221..e29a8444c2 100644 --- a/libcutils/sched_policy.cpp +++ b/libcutils/sched_policy.cpp @@ -343,16 +343,25 @@ 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]; - snprintf(buf, sizeof(buf), "/proc/%d/timerslack_ns", tid); - int fd = open(buf, O_WRONLY | O_CLOEXEC); - if (fd != -1) { - int len = snprintf(buf, sizeof(buf), "%llu", slack); - if (write(fd, buf, len) != len) { - SLOGE("set_timerslack_ns write failed: %s\n", strerror(errno)); + if (__sys_supports_timerslack) { + char buf[64]; + snprintf(buf, sizeof(buf), "/proc/%d/timerslack_ns", tid); + int fd = open(buf, O_WRONLY | O_CLOEXEC); + if (fd != -1) { + int len = snprintf(buf, sizeof(buf), "%llu", slack); + if (write(fd, buf, len) != len) { + SLOGE("set_timerslack_ns write failed: %s\n", strerror(errno)); + } + close(fd); + return; + } + } + + // TODO: Remove when /proc/<tid>/timerslack_ns interface is backported. + if ((tid == 0) || (tid == gettid())) { + if (prctl(PR_SET_TIMERSLACK, slack) == -1) { + SLOGE("set_timerslack_ns prctl failed: %s\n", strerror(errno)); } - close(fd); - return; } } @@ -431,10 +440,7 @@ int set_sched_policy(int tid, SchedPolicy policy) } - if (__sys_supports_timerslack) { - set_timerslack_ns(tid, policy == SP_BACKGROUND ? - TIMER_SLACK_BG : TIMER_SLACK_FG); - } + set_timerslack_ns(tid, policy == SP_BACKGROUND ? TIMER_SLACK_BG : TIMER_SLACK_FG); return 0; } |