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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-15 15:00:20 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 15:00:20 (GMT) |
| commit | 9c63d9c021f375a2708ad79043d6f4dd1291a085 (patch) | |
| tree | 99cf4af567ae79f42cc47d69c59407515539ba1f | |
| parent | 71e20f1873d46e138c26ce83f8fe54b7221f572f (diff) | |
| download | linux-9c63d9c021f375a2708ad79043d6f4dd1291a085.tar.xz | |
sched: sync wakeups preempt too
make sure sync wakeups preempt too - the scheduler will not
overschedule as we've got various throttles against that.
As a result, sync wakeups can be used more widely in the kernel
(to signal wakeup affinity between tasks), and no arbitrary
latencies will be introduced either.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/sched.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 7fd3434..bba57ad 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1596,16 +1596,7 @@ out_activate: schedstat_inc(p, se.nr_wakeups_remote); update_rq_clock(rq); activate_task(rq, p, 1); - /* - * Sync wakeups (i.e. those types of wakeups where the waker - * has indicated that it will leave the CPU in short order) - * don't trigger a preemption, if the woken up task will run on - * this cpu. (in this case the 'I will reschedule' promise of - * the waker guarantees that the freshly woken up task is going - * to be considered on this CPU.) - */ - if (!sync || rq->curr == rq->idle) - check_preempt_curr(rq, p); + check_preempt_curr(rq, p); success = 1; out_running: |