linux-kernel - Re: [linux-pm] Proposal for a new algorithm for reading & writing a hibernation image.

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Message-ID: <20100530052546.GA25287@ucw.cz>
Date:	Sun, 30 May 2010 07:25:46 +0200
From:	Pavel Machek <pavel@....cz>
To:	Nigel Cunningham <ncunningham@...a.org.au>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	TuxOnIce-devel <tuxonice-devel@...onice.net>
Subject: Re: [linux-pm] Proposal for a new algorithm for reading & writing
 a hibernation image.

Hi!

> 2. Prior to writing any of the image, also set up new 4k page tables 
> such that an attempt to make a change to any of the pages we're about to 
> write to disk will result in a page fault, giving us an opportunity to 
> flag the page as needing an atomic copy later. Once this is done, write 
> protection for the page can be disabled and the write that caused the 
> fault allowed to proceed.

Tricky.

page faulting code touches memory, too...

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