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 16:07:40 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	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>,
	Ray Lee <ray-lk@...rabbit.org>,
	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 07/29/2007 03:12 PM, Alan Cox wrote:

>> What are the tradeoffs here? What wants small chunks? Also, as far as
>> I'm aware Linux does not do things like up the granularity when it
>> notices it's swapping in heavily? That sounds sort of promising...
> 
> Small chunks means you get better efficiency of memory use - large chunks
> mean you may well page in a lot more than you needed to each time (and 
> cause more paging in turn). Your disk would prefer you fed it big linear
> I/O's - 512KB would probably be my first guess at tuning a large box 
> under load for paging chunk size.

That probably kills my momentary hope that I was looking at yet another good 
use of large soft-pages seeing as how 512K would be going overboard a bit 
right? :-/

> More radically if anyone wants to do real researchy type work - how about
> log structured swap with a cleaner  ?

Right over my head. Why does log-structure help anything?

Rene.

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