linux-kernel - Re: [PATCH -mm 0/2] Use freezeable workqueues to avoid suspend-related XFS corruptions

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Message-Id: <1164062390.15714.5.camel@nigel.suspend2.net>
Date:	Tue, 21 Nov 2006 09:39:50 +1100
From:	Nigel Cunningham <nigelc@....st>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	David Chinner <dgc@....com>, Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH -mm 0/2] Use freezeable workqueues to avoid
	suspend-related XFS corruptions

(Sorry to reply again)

On Tue, 2006-11-21 at 09:26 +1100, Nigel Cunningham wrote:
> Hi.
> 
> On Mon, 2006-11-20 at 23:18 +0100, Rafael J. Wysocki wrote:
> > I think I/O can only be submitted from the process context.  Thus if we freeze
> > all (and I mean _all_) threads that are used by filesystems, including worker
> > threads, we should effectively prevent fs-related I/O from being submitted
> > after tasks have been frozen.
> 
> I know that will work. It's what I used to do before the switch to bdev
> freezing. I guess I need to look again at why I made the switch. Perhaps
> it was just because you guys gave freezing kthreads a bad wrap as too
> invasive or something. Bdev freezing is certainly fewer lines of code.

No, it looks like I wrongly believed that XFS was submitting I/O off a
timer, so that freezing kthreads wasn't enough. In that case, it looks
like freezing kthreads should be a good solution.

Regards,

Nigel

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