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Add DEQUEUE_MIGRATING with DEQUEUE_SLEEP when blocking proxy donors and add ENQUEUE_MIGRATING on the activation path if the task woke up for reason other than proxy chain-wakeup. Signed-off-by: K Prateek Nayak --- include/linux/sched.h | 1 + kernel/sched/core.c | 9 ++++++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 76de348fb88b..a05240b52806 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1003,6 +1003,7 @@ struct task_struct { unsigned sched_contributes_to_load:1; unsigned sched_migrated:1; unsigned sched_task_hot:1; + unsigned sched_migrated_on_blocking:1; /* Force alignment to the next boundary: */ unsigned :0; diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 957f30632b82..ff499d4532ad 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2285,6 +2285,10 @@ static void block_task(struct rq *rq, struct task_struct *p, unsigned long task_ !(task_state & TASK_NOLOAD) && !(task_state & TASK_FROZEN); + p->sched_migrated_on_blocking = !!p->is_linked; + if (p->is_linked) + flags |= DEQUEUE_MIGRATING; + if (unlikely(is_special_task_state(task_state))) flags |= DEQUEUE_SPECIAL; @@ -3415,7 +3419,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) trace_sched_migrate_task(p, new_cpu); if (task_cpu(p) != new_cpu) { - if (p->sched_class->migrate_task_rq) + if (!p->sched_migrated_on_blocking && p->sched_class->migrate_task_rq) p->sched_class->migrate_task_rq(p, new_cpu); p->se.nr_migrations++; perf_event_task_migrate(p); @@ -3863,6 +3867,9 @@ ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags, if (p->sched_contributes_to_load) rq->nr_uninterruptible--; + if (p->sched_migrated_on_blocking) + en_flags |= ENQUEUE_MIGRATING; + if (wake_flags & WF_RQ_SELECTED) en_flags |= ENQUEUE_RQ_SELECTED; if (wake_flags & WF_MIGRATED) -- 2.34.1