linux-kernel - Re: Hibernating To Swap Considered Harmful

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Message-ID: <20070716053751.GA13707@nineveh.local>
Date:	Mon, 16 Jul 2007 01:37:52 -0400
From:	jfannin@...il.com (Joseph Fannin)
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Joseph Fannin <jfannin@...il.com>, david@...g.hm,
	"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 Sat, Jul 14, 2007 at 11:48:17AM +0200, Rafael J. Wysocki wrote:
> On Saturday, 14 July 2007 02:45, Joseph Fannin wrote:
> > On Fri, Jul 13, 2007 at 11:30:50AM +0200, Rafael J. Wysocki wrote:
> > > On Friday, 13 July 2007 07:42, Joseph Fannin wrote:
> > > > On Thu, Jul 12, 2007 at 08:06:43PM -0700, david@...g.hm wrote:
> > >
> > > If you're afraid of that, use a dedicated swap file.
> >
> >     I don't understand what you mean.  A dedicated swap file for what?
>
> Sorry, I should have been more precise.
>
> For hibernation (ie. a swap file that you activate right befor the
> hibernation).
>
> Also tuxonice (formerly known as suspend2) allows you to use regular files
> hibernation.

     How is that different from what I proposed, other than the
requirement to pass the swap data stuctures between the two kernels?

     Even if you only expect hibernation to work only _most of the
time_, suspending to swap means allocating a bunch of swap space that
you intend to never be used as swap.  The two functions don't really
belong together.

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

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