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| author | Ingo Molnar <mingo@kernel.org> | 2013-08-14 17:58:56 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-08-14 17:58:56 +0200 |
| commit | 6f1d657668ac3041b65265d3653d7e9172a0d603 (patch) | |
| tree | 6e837c683783708637cc4caf9de759166c7469b7 /kernel/sched/core.c | |
| parent | d4e4ab86bcba5a72779c43dc1459f71fea3d89c8 (diff) | |
| parent | d13508f9440e46dccac6a2dd48d51a73b2207482 (diff) | |
| download | linux-6f1d657668ac3041b65265d3653d7e9172a0d603.tar.bz2 | |
Merge branch 'timers/nohz-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into timers/nohz
Pull nohz improvements from Frederic Weisbecker:
" It mostly contains fixes and full dynticks off-case optimizations. I believe that
distros want to enable this feature so it seems important to optimize the case
where the "nohz_full=" parameter is empty. ie: I'm trying to remove any performance
regression that comes with NO_HZ_FULL=y when the feature is not used.
This patchset improves the current situation a lot (off-case appears to be around 11% faster
with hackbench, although I guess it may vary depending on the configuration but it should be
significantly faster in any case) now there is still some work to do: I can still observe a
remaining loss of 1.6% throughput seen with hackbench compared to CONFIG_NO_HZ_FULL=n. "
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index b7c32cb7bfeb..3fb7acee7326 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2510,13 +2510,11 @@ void __sched schedule_preempt_disabled(void) */ asmlinkage void __sched notrace preempt_schedule(void) { - struct thread_info *ti = current_thread_info(); - /* * If there is a non-zero preempt_count or interrupts are disabled, * we do not want to preempt the current task. Just return.. */ - if (likely(ti->preempt_count || irqs_disabled())) + if (likely(!preemptible())) return; do { |