linux-kernel - Re: [PATCH 02/10] Introduce mm_has_pending

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Message-ID: <1298995464.461.9.camel@tp-t61>
Date:	Tue, 01 Mar 2011 10:04:24 -0600
From:	Nathan Lynch <ntl@...ox.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Oren Laadan <orenl@...columbia.edu>, linux-aio@...ck.org
Subject: Re: [PATCH 02/10] Introduce mm_has_pending_aio() helper

On Tue, 2011-03-01 at 10:40 -0500, Jeff Moyer wrote:
> 
> ntl@...ox.com writes:
> 
> > From: Nathan Lynch <ntl@...ox.com>
> >
> > Support for AIO is on the to-do list, but until that is implemented,
> > checkpoint will have to fail if a mm_struct has outstanding AIO
> > contexts.  Add a mm_has_pending_aio() helper function for this
> > purpose.
> 
> Just because a process has an io context, doesn't mean that the process
> has active outstanding requests.  So, is this really what you wanted to
> test?

As a temporary measure, yeah.  We haven't settled on code to
record/restore the io context objects themselves, so we do want to bail
if we encounter any.  I realize now the name of the function doesn't
actually express this well.  Will try to come up with something better
for the next round.

Thanks!


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