linux-kernel - Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23]

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Date:	Sun, 29 Jul 2007 10:52:12 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Rene Herman" <rene.herman@...il.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>, david@...g.hm,
	"Daniel Hazelton" <dhazelton@...er.net>,
	"Mike Galbraith" <efault@....de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Frank Kingswood" <frank@...gswood-consulting.co.uk>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Jesper Juhl" <jesper.juhl@...il.com>,
	"ck list" <ck@....kolivas.org>, "Paul Jackson" <pj@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23]

On 7/29/07, Rene Herman <rene.herman@...il.com> wrote:
> On 07/29/2007 07:19 PM, Ray Lee wrote:
> For me, it is generally the case yes. We are still discussing this in the
> context of desktop machines and their problems with being slow as things
> have been swapped out and generally I expect a desktop to have plenty of
> swap which it's not regularly going to fillup significantly since then the
> machine's unworkably slow as a desktop anyway.

<Shrug> Well, that doesn't match my systems. My laptop has 400MB in swap:

ray@...enix:~$ free
             total       used       free     shared    buffers     cached
Mem:        894208     883920      10288          0       3044     163224
-/+ buffers/cache:     717652     176556
Swap:      1116476     393132     723344

> > And once there's something already in swap, you now have a packing
> > problem when you want to swap something else out.
>
> Once we're crammed, it gets to be a different situation yes. As far as I'm
> concerned that's for another thread though. I'm spending too much time on
> LKML as it is...

No, it's not even when crammed. It's just when there are holes.
mm/swapfile.c does try to cluster things, but doesn't work too hard at
it as we don't want to spend all our time looking for a perfect fit
that may not exist.

Ray
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