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authorIngo Molnar <mingo@elte.hu>2007-11-09 22:39:39 +0100
committerIngo Molnar <mingo@elte.hu>2007-11-09 22:39:39 +0100
commit502d26b524d8980f3ed80d9aec398e85671a8160 (patch)
tree7a377cb8a688dbfe98c9d0b00ed957c2df816ef4 /kernel/sched_fair.c
parent77d9cc44b543fa831169e54c495ad06ef3a0c726 (diff)
downloadblackbird-op-linux-502d26b524d8980f3ed80d9aec398e85671a8160.tar.gz
blackbird-op-linux-502d26b524d8980f3ed80d9aec398e85671a8160.zip
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: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index d558716a9add..6c361472cc74 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -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);
}
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