linux-kernel - Re: [RFC][PATCH -mm][Experimental] suspend: Do not freeze md

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Message-ID: <17742.26007.249504.79631@cse.unsw.edu.au>
Date:	Mon, 6 Nov 2006 09:28:39 +1100
From:	Neil Brown <neilb@...e.de>
To:	Pavel Machek <pavel@....cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>, linux-raid@...r.kernel.org
Subject: Re: [RFC][PATCH -mm][Experimental] suspend: Do not freeze md_threads

On Sunday November 5, pavel@....cz wrote:
> Hi!
> 
> > If there's a swap file on a software RAID, it should be possible to use this
> > file for saving the swsusp's suspend image.  Also, this file should be
> > available to the memory management subsystem when memory is being freed before
> > the suspend image is created.
> > 
> > For the above reasons it seems that md_threads should not be frozen during
> > the suspend and the appended patch makes this happen, but then there is the
> > question if they don't cause any data to be written to disks after the
> > suspend image has been created, provided that all filesystems are frozen
> > at that time.
> 
> Looks okay to me. It would be nice to have someone (Ingo? Neil?) try
> to suspend to swap on md......

Yes... suspending to swap-on-md would probably be fairly easy.
Resuming from that same swap might be a bit more of a challenge.
If only I had more time...

but the patch looks good to me.  I'll see that it gets applied.
Thanks,

NeilBrown

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