linux-kernel - Re: [linux-pm] Re: hibernation/snapshot design [was Re: [PATCH] Remove process freezer from suspend to RAM pathway]

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Message-ID: <18066.59225.533802.387340@cargo.ozlabs.ibm.com>
Date:	Tue, 10 Jul 2007 11:56:41 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	nigel@...pend2.net
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	linux-kernel@...r.kernel.org, Kyle Moffett <mrmacman_g4@....com>,
	Pavel Machek <pavel@....cz>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [linux-pm] Re: hibernation/snapshot design [was Re: [PATCH] Remove
	process freezer from suspend to RAM pathway]

Nigel Cunningham writes:

> (Finally catching up on emails since Saturday!)

Yes, I know what you mean; I was occupied with other work stuff on
Friday and not well on Saturday, and by that stage there was a backlog
of about 500 emails for me to wade through... :/

> The freezer is also essential for doing a full image of memory - you
> have to be able to guarantee that some of the image won't change in
> order to be able to write it out before the atomic copy. Of course the
> freezer alone isn't enough, but it solves 95% of the issue.

Sure.  As I pointed out in another email, it's unrealistic to expect
the freezer to be able to stop everything in a state where any
arbitrary mutex is free.  But as long as you don't need to do anything
that depends on getting a mutex while the system is frozen, there
should be no problem.

Paul.
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