Re: [RFC PATCH(Experimental) 2/4] Revert changes to workqueue.c

From: Srivatsa Vaddagiri
Date: Wed Feb 21 2007 - 01:30:31 EST

On Tue, Feb 20, 2007 at 11:09:36PM +0300, Oleg Nesterov wrote:
> > Which caller are you referring to here? Maybe we can decide on the
> > option after we see the users of flush_workqueue() in DOWN_PREPARE.
> mm/slab.c:cpuup_callback()

The cancel_rearming_delayed_work, if used as it is in cpuup_callback,
will require that we send DOWN_PREPARE before freeze_processes().

But ..I am wondering if we can avoid doing cancel_rearming_delayed_work
(and thus flush_workqueue) in CPU_DOWN_PREPARE of slab.c. Basically,


CPU_DOWN_PREPARE: /* All processes frozen now */
cancel_delayed_work(&per_cpu(reap_work, cpu).timer);
del_work(&per_cpu(reap_work, cpu).work);

At the point of CPU_DOWN_PREPARE, keventd should be frozen and hence
del_work() is a matter of just deleting the work from cwq->worklist.

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