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sched/fair: Do not try to migrate delayed dequeue task

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Migrating a delayed dequeued task doesn't help in balancing the number
of runnable tasks in the system.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Link: https://lore.kernel.org/r/20241202174606.4074512-11-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2024-12-02 18:46:05 +01:00 committed by Peter Zijlstra
parent 736c55a02c
commit 61b82dfb6b
1 changed files with 8 additions and 4 deletions
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12
kernel/sched/fair.c
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@ -9391,11 +9391,15 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
/*
* We do not migrate tasks that are:
* 1) throttled_lb_pair, or
* 2) cannot be migrated to this CPU due to cpus_ptr, or
* 3) running (obviously), or
* 4) are cache-hot on their current CPU.
* 1) delayed dequeued unless we migrate load, or
* 2) throttled_lb_pair, or
* 3) cannot be migrated to this CPU due to cpus_ptr, or
* 4) running (obviously), or
* 5) are cache-hot on their current CPU.
*/
if ((p->se.sched_delayed) && (env->migration_type != migrate_load))
return 0;
if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu))
return 0;