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sched: default to more agressive yield for SCHED_BATCH tasks

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do more agressive yield for SCHED_BATCH tuned tasks: they are all
about throughput anyway. This allows a gentler migration path for
any apps that relied on stronger yield.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-12-04 17:04:39 +01:00
parent 77034937dc
commit db292ca302
1 changed files with 4 additions and 3 deletions
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7
kernel/sched_fair.c
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@ -799,8 +799,9 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep)
*/
static void yield_task_fair(struct rq *rq)
{
struct cfs_rq *cfs_rq = task_cfs_rq(rq->curr);
struct sched_entity *rightmost, *se = &rq->curr->se;
struct task_struct *curr = rq->curr;
struct cfs_rq *cfs_rq = task_cfs_rq(curr);
struct sched_entity *rightmost, *se = &curr->se;
/*
* Are we the only task in the tree?
@ -808,7 +809,7 @@ static void yield_task_fair(struct rq *rq)
if (unlikely(cfs_rq->nr_running == 1))
return;
if (likely(!sysctl_sched_compat_yield)) {
if (likely(!sysctl_sched_compat_yield) && curr->policy != SCHED_BATCH) {
__update_rq_clock(rq);
/*
* Update run-time statistics of the 'current'.