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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: Scott Wood <swood@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/1578736419-14628-2-git-send-email-swood@redhat.com
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@ -3669,22 +3669,24 @@ static void sched_tick_remote(struct work_struct *work)
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* statistics and checks timeslices in a time-independent way, regardless
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* of when exactly it is running.
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*/
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if (idle_cpu(cpu) || !tick_nohz_tick_stopped_cpu(cpu))
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if (!tick_nohz_tick_stopped_cpu(cpu))
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goto out_requeue;
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rq_lock_irq(rq, &rf);
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curr = rq->curr;
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if (is_idle_task(curr) || cpu_is_offline(cpu))
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if (cpu_is_offline(cpu))
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goto out_unlock;
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update_rq_clock(rq);
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delta = rq_clock_task(rq) - curr->se.exec_start;
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/*
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* Make sure the next tick runs within a reasonable
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* amount of time.
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*/
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WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3);
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if (!is_idle_task(curr)) {
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/*
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* Make sure the next tick runs within a reasonable
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* amount of time.
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*/
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delta = rq_clock_task(rq) - curr->se.exec_start;
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WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3);
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}
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curr->sched_class->task_tick(rq, curr, 0);
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out_unlock:
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