linux-kernel - Re: Hibernating To Swap Considered Harmful

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Date:	Fri, 13 Jul 2007 02:20:39 -0400
From:	jfannin@...il.com (Joseph Fannin)
To:	david@...g.hm
Cc:	Joseph Fannin <jfannin@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Huang, Ying" <ying.huang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>, nigel@...el.suspend2.net,
	Jeremy Maitin-Shepard <jbms@....edu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: Hibernating To Swap Considered Harmful

On Thu, Jul 12, 2007 at 10:57:04PM -0700, david@...g.hm wrote:
> On Fri, 13 Jul 2007, Joseph Fannin wrote:
>
> the only justification I have heard for why the hibernate image must be
> written to the swap partition is backwards compatibility (i.e., we've
> always done it that way)
>
> if you are going to reserve disk space for hibernation, what is so bad
> about useing a normal partition?
>
    You have to either repartition when you upgrade your memory, or
waste a bunch of disk space with a partition as large as you think
your RAM might ever expand to.

    Swap/hibernate files can be created, deleted, and resized without
partitioning.

    Also: not all platforms support a large number of partitions.
It's not academic -- Intel Macintoshes are limited to four, with two
taken by Mac OS.  Add Windows and a Linux /, and you're out --
there's no room for a swap file.

--
Joseph Fannin
jfannin@...il.com

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