linux-kernel - Re: [PATCH] Freeze bdevs when freezing processes.

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Message-Id: <1161854338.17293.25.camel@nigel.suspend2.net>
Date:	Thu, 26 Oct 2006 19:18:57 +1000
From:	Nigel Cunningham <ncunningham@...uxmail.org>
To:	David Chinner <dgc@....com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>, xfs@....sgi.com
Subject: Re: [PATCH] Freeze bdevs when freezing processes.

Hi.

On Thu, 2006-10-26 at 18:57 +1000, David Chinner wrote:
> I didn't think we've ever done that - periodic or delayed operations
> are passed off to the kernel threads to execute. A stack trace
> (if you still have it) would be really help here.

I don't, but I know how to get it again. Will give it a go shortly.

> Hmmm - we have a couple of per-cpu work queues as well that are
> used on I/O completion and that can, in some circumstances,
> trigger new transactions. If we are only flush metadata, then
> I don't think that any more I/o will be issued, but I could be
> wrong (maze of twisty passages).

I can understand that. I'm trying to learn Xgl programming at the mo :)

Nigel

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