Commit 488603b8 authored by Scott Wood's avatar Scott Wood Committed by Ingo Molnar

sched/core: Don't skip remote tick for idle CPUs

This will be used in the next patch to get a loadavg update from
nohz cpus.  The delta check is skipped because idle_sched_class
doesn't update se.exec_start.
Signed-off-by: default avatarScott Wood <swood@redhat.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/1578736419-14628-2-git-send-email-swood@redhat.com
parent afa70d94
...@@ -3669,22 +3669,24 @@ static void sched_tick_remote(struct work_struct *work) ...@@ -3669,22 +3669,24 @@ static void sched_tick_remote(struct work_struct *work)
* statistics and checks timeslices in a time-independent way, regardless * statistics and checks timeslices in a time-independent way, regardless
* of when exactly it is running. * of when exactly it is running.
*/ */
if (idle_cpu(cpu) || !tick_nohz_tick_stopped_cpu(cpu)) if (!tick_nohz_tick_stopped_cpu(cpu))
goto out_requeue; goto out_requeue;
rq_lock_irq(rq, &rf); rq_lock_irq(rq, &rf);
curr = rq->curr; curr = rq->curr;
if (is_idle_task(curr) || cpu_is_offline(cpu)) if (cpu_is_offline(cpu))
goto out_unlock; goto out_unlock;
update_rq_clock(rq); update_rq_clock(rq);
delta = rq_clock_task(rq) - curr->se.exec_start;
if (!is_idle_task(curr)) {
/* /*
* Make sure the next tick runs within a reasonable * Make sure the next tick runs within a reasonable
* amount of time. * amount of time.
*/ */
delta = rq_clock_task(rq) - curr->se.exec_start;
WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3); WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3);
}
curr->sched_class->task_tick(rq, curr, 0); curr->sched_class->task_tick(rq, curr, 0);
out_unlock: out_unlock:
......
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