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sched_ext: Don't trigger ops.quiescent/runnable() on migrations

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A task moving across CPUs should not trigger quiescent/runnable task state
events as the task is staying runnable the whole time and just stopping and
then starting on different CPUs. Suppress quiescent/runnable task state
events if task_on_rq_migrating().

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: David Vernet <void@manifault.com>
Cc: Daniel Hodges <hodges.daniel.scott@gmail.com>
Cc: Changwoo Min <multics69@gmail.com>
Cc: Andrea Righi <andrea.righi@linux.dev>
Cc: Dan Schatzberg <schatzberg.dan@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2024-09-09 13:40:44 -10:00
parent 750a40d816
commit 513ed0c7cc
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/ext.c
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@ -2066,7 +2066,7 @@ static void enqueue_task_scx(struct rq *rq, struct task_struct *p, int enq_flags
rq->scx.nr_running++;
add_nr_running(rq, 1);
if (SCX_HAS_OP(runnable))
if (SCX_HAS_OP(runnable) && !task_on_rq_migrating(p))
SCX_CALL_OP_TASK(SCX_KF_REST, runnable, p, enq_flags);
if (enq_flags & SCX_ENQ_WAKEUP)
@ -2150,7 +2150,7 @@ static bool dequeue_task_scx(struct rq *rq, struct task_struct *p, int deq_flags
SCX_CALL_OP_TASK(SCX_KF_REST, stopping, p, false);
}
if (SCX_HAS_OP(quiescent))
if (SCX_HAS_OP(quiescent) && !task_on_rq_migrating(p))
SCX_CALL_OP_TASK(SCX_KF_REST, quiescent, p, deq_flags);
if (deq_flags & SCX_DEQ_SLEEP)