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psi: Use deferrable psi_avgs_work

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The logic for psi_avgs_work to not reschedule itself does not appear
to work properly.

1) psi_avgs_work detects itself as a running task due to accounting for
current states in get_recent_times().

2) Drivers with self-rescheduling deferrable work with a period
less than that of psi_avgs_work will always run when psi_avgs_work runs.
This causes psi_avgs_work to retrigger.

Make psi_avgs_work deferrable to avoid this loop.

Change-Id: I90edc5d3cce87ada803f549f417cd0108ef2017f
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
This commit is contained in:
Patrick Daly 2019-06-17 15:40:01 -07:00 • committed by Isaac J. Manjarres
commit b81d7fab27
1 changed files with 1 additions and 1 deletions
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2
kernel/sched/psi.c
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@ -189,7 +189,7 @@ static void group_init(struct psi_group *group)
for_each_possible_cpu(cpu)
seqcount_init(&per_cpu_ptr(group->pcpu, cpu)->seq);
group->avg_next_update = sched_clock() + psi_period;
INIT_DELAYED_WORK(&group->avgs_work, psi_avgs_work);
INIT_DEFERRABLE_WORK(&group->avgs_work, psi_avgs_work);
mutex_init(&group->avgs_lock);
/* Init trigger-related members */
atomic_set(&group->poll_scheduled, 0);