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

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
...@@ -1016,6 +1016,11 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd) ...@@ -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, ...@@ -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]);
......
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