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sched/core: Keep rq online after cpu isolation

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To move tasks off a cpu when offlining the rq needs to be offlined to
un-throttle tasks.  However, tasks might still run on the CPU even after
the CPU has been isolated (per-CPU threads). Thus we should leave the rq
in online state after tasks have been moved.

Change-Id: I61486e8648af0dbb82595fe699e1bc158e837362
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
This commit is contained in:
Olav Haugan 2016-11-03 13:39:23 -07:00
parent 411a978bce
commit 34a3cdf14e
1 changed files with 7 additions and 5 deletions
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12
kernel/sched/core.c
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@ -5581,15 +5581,21 @@ int do_isolation_work_cpu_stop(void *data)
sched_ttwu_pending();
/* Update our root-domain */
raw_spin_lock(&rq->lock);
/*
* Temporarily mark the rq as offline. This will allow us to
* move tasks off the CPU.
*/
if (rq->rd) {
BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span));
set_rq_offline(rq);
}
migrate_tasks(rq, false);
if (rq->rd)
set_rq_online(rq);
raw_spin_unlock(&rq->lock);
/*
@ -5749,10 +5755,6 @@ int sched_unisolate_cpu_unlocked(int cpu)
raw_spin_lock_irqsave(&rq->lock, flags);
rq->age_stamp = sched_clock_cpu(cpu);
if (rq->rd) {
BUG_ON(!cpumask_test_cpu(cpu, rq->rd->span));
set_rq_online(rq);
}
raw_spin_unlock_irqrestore(&rq->lock, flags);
}