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sched: allow the immediate migration of cache-cold tasks 

allow the immediate migration of cache-cold tasks.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2007-10-15 17:00:18 +02:00
parent cc367732ff
commit 6bc1665ba7
1 changed files with 7 additions and 1 deletions
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8
kernel/sched.c
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@ -1016,6 +1016,11 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
if (p->sched_class != &fair_sched_class) if (p->sched_class != &fair_sched_class)
return 0; return 0;
if (sysctl_sched_migration_cost == -1)
return 1;
if (sysctl_sched_migration_cost == 0)
return 0;
delta = now - p->se.exec_start; delta = now - p->se.exec_start;
return delta < (s64)sysctl_sched_migration_cost; return delta < (s64)sysctl_sched_migration_cost;
@ -2189,7 +2194,8 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
* 2) too many balance attempts have failed. * 2) too many balance attempts have failed.
*/ */
if (sd->nr_balance_failed > sd->cache_nice_tries) { if (!task_hot(p, rq->clock, sd) ||
sd->nr_balance_failed > sd->cache_nice_tries) {
#ifdef CONFIG_SCHEDSTATS #ifdef CONFIG_SCHEDSTATS
if (task_hot(p, rq->clock, sd)) { if (task_hot(p, rq->clock, sd)) {
schedstat_inc(sd, lb_hot_gained[idle]); schedstat_inc(sd, lb_hot_gained[idle]);