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

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Message-ID: <453CCE75.20302@yahoo.com.au>
Date:	Tue, 24 Oct 2006 00:15:17 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Nigel Cunningham <ncunningham@...uxmail.org>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] Freeze bdevs when freezing processes.

Rafael J. Wysocki wrote:

> This case is a bit special.  I don't think it would be right to require every
> device driver writer to avoid modifying RCU pages from the interrupt
> context, because that would break the suspend to disk ...
> 
> Besides, if there is an RCU page that we _know_ we can use to store the image
> in it, we can just include this page in the image without copying.  This
> already gives us one extra free page for the rest of the image and we can
> _avoid_ creating two images which suspend2 does and which adds a _lot_ of
> complexity to the code.

If you don't mind me asking... what are these RCU pages you speak of?
I couldn't work it out by grepping kernel/power/*

-- 
SUSE Labs, Novell Inc.
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