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sched: fix group scheduling for SCHED_BATCH 

The following patch (sched: disable sleeper_fairness on SCHED_BATCH)
seems to break GROUP_SCHED. Although, it may be 'oops'-less due to the
possibility of 'p' being always a valid address.

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Dmitry Adamushko 2007-10-15 17:00:14 +02:00 committed by Ingo Molnar
parent ace8b3d633
commit e62dd02ed0
1 changed files with 2 additions and 3 deletions
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5
kernel/sched_fair.c
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@ -485,9 +485,8 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
vruntime += sched_vslice_add(cfs_rq, se);
if (!initial) {
struct task_struct *p = container_of(se, struct task_struct, se);
if (sched_feat(NEW_FAIR_SLEEPERS) && p->policy != SCHED_BATCH)
if (sched_feat(NEW_FAIR_SLEEPERS) && entity_is_task(se) &&
task_of(se)->policy != SCHED_BATCH)
vruntime -= sysctl_sched_latency;
vruntime = max_t(s64, vruntime, se->vruntime);