linux-kernel - Re: [update 2] Re: [RFC][PATCH] PM: Avoid losing wakeup events during suspend

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Date:	Fri, 25 Jun 2010 16:57:57 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Florian Mickler <florian@...kler.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Neil Brown <neilb@...e.de>, mark gross <640e9920@...il.com>
Subject: Re: [update 2] Re: [RFC][PATCH] PM: Avoid losing wakeup events during
 suspend

On Fri, 25 Jun 2010, Rafael J. Wysocki wrote:

> > > You seem to be referring to the PM workqueue specifically.  Perhaps it would be
> > > better to special-case it and stop it by adding a barrier work during suspend
> > > instead of just freezing?  Then, it wouldn't need to be singlethread any more.
> > 
> > The barrier work would have to be queued to each CPU's thread.  That
> > would be okay.
> 
> I guess we should stop the PM workqueue after the freezing of tasks, shouldn't we?

Yes.  The exact spot probably doesn't matter; that's as good as any.

> > Hmm, it looks like wait_event_freezable() and
> > wait_event_freezable_timeout() could use similar changes: If the
> > condition is true then they shouldn't try to freeze the caller.
> 
> Yes, but that should be a separate patch IMHO.

Agreed.

Alan Stern

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