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Micro-optimize sleepq_signal().

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Lift a comparison out of the loop that finds the highest-priority thread
on the queue.

MFC after:	1 week
This commit is contained in:
Mark Johnston 2016-09-04 00:29:48 +00:00
parent dd9cb6da0b
commit 3da0f3c9ae
1 changed files with 2 additions and 2 deletions

4
sys/kern/subr_sleepqueue.c

@ -861,9 +861,9 @@ sleepq_signal(void *wchan, int flags, int pri, int queue)
* been sleeping the longest since threads are always added to * been sleeping the longest since threads are always added to
* the tail of sleep queues. * the tail of sleep queues.
*/ */
besttd = NULL; besttd = TAILQ_FIRST(&sq->sq_blocked[queue]);
TAILQ_FOREACH(td, &sq->sq_blocked[queue], td_slpq) { TAILQ_FOREACH(td, &sq->sq_blocked[queue], td_slpq) {
if (besttd == NULL || td->td_priority < besttd->td_priority) if (td->td_priority < besttd->td_priority)
besttd = td; besttd = td;
} }
MPASS(besttd != NULL); MPASS(besttd != NULL);