Leonardo Bras aae17ebb53
workqueue: Avoid using isolated cpus' timers on queue_delayed_work ...
When __queue_delayed_work() is called, it chooses a cpu for handling the
timer interrupt. As of today, it will pick either the cpu passed as
parameter or the last cpu used for this.
This is not good if a system does use CPU isolation, because it can take
away some valuable cpu time to:
1 - deal with the timer interrupt,
2 - schedule-out the desired task,
3 - queue work on a random workqueue, and
4 - schedule the desired task back to the cpu.
So to fix this, during __queue_delayed_work(), if cpu isolation is in
place, pick a random non-isolated cpu to handle the timer interrupt.
As an optimization, if the current cpu is not isolated, use it instead
of looking for another candidate.
Signed-off-by: Leonardo Bras <leobras@redhat.com >
Signed-off-by: Tejun Heo <tj@kernel.org >
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