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sched: activate task_hot() only on fair-scheduled tasks

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activate task_hot() only for fair-scheduled tasks (i.e. disable it
for RT tasks).

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2007-10-15 17:00:18 +02:00
committed by Ingo Molnar
parent da84d96176
commit ff56b2f015
1 changed files with 8 additions and 3 deletions
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11
kernel/sched.c
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@@ -2122,11 +2122,16 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
* Is this task likely cache-hot: * Is this task likely cache-hot:
*/ */
static inline int static inline int
task_hot(struct task_struct *p, unsigned long long now, struct sched_domain *sd) task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
{ {
s64 delta = now - p->se.exec_start; s64 delta;
return delta < (long long)sysctl_sched_migration_cost; if (p->sched_class != &fair_sched_class)
return 0;
delta = now - p->se.exec_start;
return delta < (s64)sysctl_sched_migration_cost;
} }
/* /*