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

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Message-Id: <1161644719.7033.25.camel@nigel.suspend2.net>
Date:	Tue, 24 Oct 2006 09:05:19 +1000
From:	Nigel Cunningham <ncunningham@...uxmail.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] Freeze bdevs when freezing processes.

Hi.

On Mon, 2006-10-23 at 16:20 +0200, Rafael J. Wysocki wrote:
> On Monday, 23 October 2006 16:15, Nick Piggin wrote:
> > 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/*
> 
> Oops, s/RCU/LRU/g (shame, shame).
> 
> Sorry for the confusion.

Ah. I wondered where RCU came into the picture, but was willing to go
with the theory that you knew something I didn't :)

Nigel

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