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sched/walt: prevent main walt_irq_work execution for no notif

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If there are no notifications pending for performing migration
work, there is no migration work to be done because the work
must have already been handled.

Optimize the walt_irq_work execution for migrations. If no
cpus got locked, then no notifications were handled, and
the irq work function should exit.

Change-Id: I57730503ebb8f440a288666c79c4cb4f31ed1023
Signed-off-by: Stephen Dickey <quic_dickey@quicinc.com>
This commit is contained in:
Stephen Dickey 2022-04-29 11:23:13 -07:00 committed by Rishabh Bhatnagar
parent 38d3a1c4e7
commit dca8a7b03c
1 changed files with 10 additions and 1 deletions
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11
kernel/sched/walt/walt.c
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@ -3674,9 +3674,18 @@ static void walt_irq_work(struct irq_work *irq_work)
cpumask_copy(&lock_cpus, cpu_possible_mask);
if (is_migration)
if (is_migration) {
irq_work_restrict_to_mig_clusters(&lock_cpus);
/*
* if the notif_pending was handled by a previous
* walt_irq_work invocation, there is no migration
* work.
*/
if (cpumask_empty(&lock_cpus))
return;
}
for_each_cpu(cpu, &lock_cpus) {
if (level == 0)
raw_spin_lock(&cpu_rq(cpu)->__lock);