The following commit has been merged into the sched/core branch of tip: Commit-ID: 61b82dfb6b7e1f951fd1e95198a2aee2ccf6a167 Gitweb: https://git.kernel.org/tip/61b82dfb6b7e1f951fd1e95198a2aee2ccf6a167 Author: Vincent Guittot <vincent.guittot@xxxxxxxxxx> AuthorDate: Mon, 02 Dec 2024 18:46:05 +01:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Mon, 09 Dec 2024 11:48:13 +01:00 sched/fair: Do not try to migrate delayed dequeue task 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@xxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@xxxxxxx> Link: https://lore.kernel.org/r/20241202174606.4074512-11-vincent.guittot@xxxxxxxxxx --- kernel/sched/fair.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 84c0191..2aa1d0c 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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;
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