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Commit 502d26b5 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: clean up the wakeup preempt check, #2 



clean up the preemption check to not use unnecessary 64-bit
variables. This improves code size:

   text    data     bss     dec     hex filename
  44227    3326      36   47589    b9e5 sched.o.before
  44201    3326      36   47563    b9cb sched.o.after

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 77d9cc44

kernel/sched_fair.c

+2 −3
Original line number Diff line number Diff line
@@ -837,7 +837,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p) 
	struct task_struct *curr = rq->curr;

	struct cfs_rq *cfs_rq = task_cfs_rq(curr);

	struct sched_entity *se = &curr->se, *pse = &p->se;

	s64 delta, gran;

	unsigned long gran;



	if (unlikely(rt_prio(p->prio))) {

		update_rq_clock(rq);
@@ -860,12 +860,11 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p) 
		pse = parent_entity(pse);

	}



	delta = se->vruntime - pse->vruntime;

	gran = sysctl_sched_wakeup_granularity;

	if (unlikely(se->load.weight != NICE_0_LOAD))

		gran = calc_delta_fair(gran, &se->load);



	if (delta > gran)

	if (pse->vruntime + gran < se->vruntime)

		resched_task(curr);

}