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

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[ Upstream commit 488603b815 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Scott Wood
2020-01-11 04:53:38 -05:00
committed by Greg Kroah-Hartman
parent b855c6399c
commit 5a309e3bf1
1 changed files with 10 additions and 8 deletions
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kernel/sched/core.c
+10 -8
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@@ -3668,22 +3668,24 @@ static void sched_tick_remote(struct work_struct *work)
* statistics and checks timeslices in a time-independent way, regardless
* 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;
rq_lock_irq(rq, &rf);
curr = rq->curr;
if (is_idle_task(curr) || cpu_is_offline(cpu))
if (cpu_is_offline(cpu))
goto out_unlock;
update_rq_clock(rq);
delta = rq_clock_task(rq) - curr->se.exec_start;
/*
* Make sure the next tick runs within a reasonable
* amount of time.
*/
WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3);
if (!is_idle_task(curr)) {
/*
* Make sure the next tick runs within a reasonable
* amount of time.
*/
delta = rq_clock_task(rq) - curr->se.exec_start;
WARN_ON_ONCE(delta > (u64)NSEC_PER_SEC * 3);
}
curr->sched_class->task_tick(rq, curr, 0);
out_unlock: