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authorIngo Molnar <mingo@elte.hu>2007-08-09 11:16:51 +0200
committerIngo Molnar <mingo@elte.hu>2007-08-09 11:16:51 +0200
commit2daa357705bfe68788132cf9079930ca948a90af (patch)
treec95e7b19e771d8eacecfb9ae9fe66ce23094b252 /kernel
parentc3b64f1e4f772418a649bb8e3b39fcea6c358330 (diff)
downloadop-kernel-dev-2daa357705bfe68788132cf9079930ca948a90af.zip
op-kernel-dev-2daa357705bfe68788132cf9079930ca948a90af.tar.gz
sched: optimize activate_task()
optimize activate_task() by removing update_rq_clock() from it. (and add update_rq_clock() to all callsites of activate_task() that did not have it before.) Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c19
1 files changed, 9 insertions, 10 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 3f5d529..9ccd91e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -910,8 +910,6 @@ static int effective_prio(struct task_struct *p)
*/
static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
{
- update_rq_clock(rq);
-
if (p->state == TASK_UNINTERRUPTIBLE)
rq->nr_uninterruptible--;
@@ -1510,6 +1508,7 @@ out_set_cpu:
out_activate:
#endif /* CONFIG_SMP */
+ update_rq_clock(rq);
activate_task(rq, p, 1);
/*
* Sync wakeups (i.e. those types of wakeups where the waker
@@ -2117,6 +2116,7 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
update_rq_clock(src_rq);
deactivate_task(src_rq, p, 0);
set_task_cpu(p, this_cpu);
+ __update_rq_clock(this_rq);
activate_task(this_rq, p, 0);
/*
* Note that idle threads have a prio of MAX_PRIO, for this test
@@ -4207,11 +4207,10 @@ recheck:
spin_unlock_irqrestore(&p->pi_lock, flags);
goto recheck;
}
+ update_rq_clock(rq);
on_rq = p->se.on_rq;
- if (on_rq) {
- update_rq_clock(rq);
+ if (on_rq)
deactivate_task(rq, p, 0);
- }
oldprio = p->prio;
__setscheduler(rq, p, policy, param->sched_priority);
if (on_rq) {
@@ -4969,6 +4968,7 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu)
}
set_task_cpu(p, dest_cpu);
if (on_rq) {
+ update_rq_clock(rq_dest);
activate_task(rq_dest, p, 0);
check_preempt_curr(rq_dest, p);
}
@@ -6623,14 +6623,13 @@ void normalize_rt_tasks(void)
goto out_unlock;
#endif
+ update_rq_clock(rq);
on_rq = p->se.on_rq;
- if (on_rq) {
- update_rq_clock(task_rq(p));
- deactivate_task(task_rq(p), p, 0);
- }
+ if (on_rq)
+ deactivate_task(rq, p, 0);
__setscheduler(rq, p, SCHED_NORMAL, 0);
if (on_rq) {
- activate_task(task_rq(p), p, 0);
+ activate_task(rq, p, 0);
resched_task(rq->curr);
}
#ifdef CONFIG_SMP
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