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Only grab the sched_lock if we actually need to modify the thread priority.

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During a buildworld only 2/3 of the calls to msleep actually changed
the priority.
This commit is contained in:
Poul-Henning Kamp 2006-11-30 08:27:38 +00:00
parent 9955cf96f6
commit a4dcb4f627
1 changed files with 5 additions and 4 deletions
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9
sys/kern/kern_synch.c
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@ -124,7 +124,7 @@ msleep(ident, mtx, priority, wmesg, timo)
{
struct thread *td;
struct proc *p;
int catch, rval, flags;
int catch, rval, flags, pri;
WITNESS_SAVE_DECL(mtx);
td = curthread;
@ -194,11 +194,12 @@ msleep(ident, mtx, priority, wmesg, timo)
sleepq_set_timeout(ident, timo);
/*
* Adjust this thread's priority.
* Adjust this thread's priority, if necessary.
*/
if ((priority & PRIMASK) != 0) {
pri = priority & PRIMASK;
if (pri != 0 && pri != td->td_priority) {
mtx_lock_spin(&sched_lock);
sched_prio(td, priority & PRIMASK);
sched_prio(td, pri);
mtx_unlock_spin(&sched_lock);
}