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sched: optimize vruntime based scheduling 

optimize vruntime based scheduling.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2007-10-15 17:00:04 +02:00
parent bf5c91ba8c
commit 6cb5819514
2 changed files with 6 additions and 2 deletions
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3
kernel/sched.c
View File

@ -732,13 +732,14 @@ calc_delta_fair(unsigned long delta_exec, struct load_weight *lw)
static inline void update_load_add(struct load_weight *lw, unsigned long inc)
{
lw->weight += inc;
if (sched_feat(FAIR_SLEEPERS))
lw->inv_weight = WMULT_CONST / lw->weight;
}
static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
{
lw->weight -= dec;
if (likely(lw->weight))
if (sched_feat(FAIR_SLEEPERS) && likely(lw->weight))
lw->inv_weight = WMULT_CONST / lw->weight;
}

3
kernel/sched_fair.c
View File

@ -336,6 +336,9 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
}
curr->vruntime += delta_exec_weighted;
if (!sched_feat(FAIR_SLEEPERS))
return;
if (unlikely(!load))
return;