linux-kernel - Re: Back to the future.

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Message-ID: <alpine.LFD.0.98.0704281640480.9964@woody.linux-foundation.org>
Date:	Sat, 28 Apr 2007 16:45:01 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: Back to the future.

On Sun, 29 Apr 2007, Rafael J. Wysocki wrote:
> 
> OK, more precisely: fs-related threads should not try to process their queues,
> etc., after the snapshot is done, because that may cause some fs data to be
> written at that time and then the fs in question may be corrupted after the
> restore.  Not all of the I/O in general, fs data.

But that's not true _either_. That's only true because right now I think 
we cannot even suspend to a swapfile (I might be wrong). 

If you have a swapfile on a filesystem, you'd need those fs queues 
running!

> Well, I'm not sure whether or not that still would have been the case if we had
> stopped to freeze kernel threads for the hibernation/suspend.

Did you miss the email where Paul pointed out that Mac/PowerPC didn't use 
to do any of this? And apparently never had any issues with it? And 
probably worked more reliably several years ago than suspend/hibernation 
does _today_?

Ie we do have history of _not_ freezing things.  The freezing came later, 
and came with the subsystem that had more problems..

		Linus
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