linux-kernel - Re: [PATCH 13/23] Hibernation: Partial page I/O support.

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Message-Id: <201010132228.22604.rjw@sisk.pl>
Date:	Wed, 13 Oct 2010 22:28:22 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Nigel Cunningham <nigel@...onice.net>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"TuxOnIce-devel" <tuxonice-devel@...onice.net>
Subject: Re: [PATCH 13/23] Hibernation: Partial page I/O support.

On Wednesday, October 13, 2010, Pavel Machek wrote:
> Hi!
> 
> > Add functions that can be used for coalescing and splitting buffers
> > that are smaller than PAGE_SIZE. These functions provide no method
> > of determining where the boundaries of the smaller buffers are to
> > be found - that is the caller's problem.
> 
> I don't get it; why do we need that support?

This is related to compression.  This way we can put data from two or more
compressed pages into one page frame.

Thanks,
Rafael
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