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Commit 6bc1665b authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: allow the immediate migration of cache-cold tasks 



allow the immediate migration of cache-cold tasks.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent cc367732

kernel/sched.c

+7 −1
Original line number Diff line number Diff line
@@ -1016,6 +1016,11 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd) 
	if (p->sched_class != &fair_sched_class)

		return 0;



	if (sysctl_sched_migration_cost == -1)

		return 1;

	if (sysctl_sched_migration_cost == 0)

		return 0;



	delta = now - p->se.exec_start;



	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.

	 */



	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

		if (task_hot(p, rq->clock, sd)) {

			schedstat_inc(sd, lb_hot_gained[idle]);