sched: Set skip_clock_update in yield_task_fair()
This is another case where we are on our way to schedule(), so can save a useless clock update and resulting microscopic vruntime update. Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1321971686.6855.18.camel@marge.simson.net Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
parent
76854c7e8f
commit
916671c08b
|
@ -4547,6 +4547,13 @@ again:
|
||||||
*/
|
*/
|
||||||
if (preempt && rq != p_rq)
|
if (preempt && rq != p_rq)
|
||||||
resched_task(p_rq->curr);
|
resched_task(p_rq->curr);
|
||||||
|
} else {
|
||||||
|
/*
|
||||||
|
* We might have set it in task_yield_fair(), but are
|
||||||
|
* not going to schedule(), so don't want to skip
|
||||||
|
* the next update.
|
||||||
|
*/
|
||||||
|
rq->skip_clock_update = 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
out:
|
out:
|
||||||
|
|
|
@ -3075,6 +3075,12 @@ static void yield_task_fair(struct rq *rq)
|
||||||
* Update run-time statistics of the 'current'.
|
* Update run-time statistics of the 'current'.
|
||||||
*/
|
*/
|
||||||
update_curr(cfs_rq);
|
update_curr(cfs_rq);
|
||||||
|
/*
|
||||||
|
* Tell update_rq_clock() that we've just updated,
|
||||||
|
* so we don't do microscopic update in schedule()
|
||||||
|
* and double the fastpath cost.
|
||||||
|
*/
|
||||||
|
rq->skip_clock_update = 1;
|
||||||
}
|
}
|
||||||
|
|
||||||
set_skip_buddy(se);
|
set_skip_buddy(se);
|
||||||
|
|
Loading…
Reference in New Issue