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

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Message-ID: <46AAEDEB.7040003@gmail.com>
Date:	Sat, 28 Jul 2007 09:19:07 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	david@...g.hm
CC:	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 07/27/2007 09:43 PM, david@...g.hm wrote:

> On Fri, 27 Jul 2007, Rene Herman wrote:
> 
>> On 07/27/2007 07:45 PM, Daniel Hazelton wrote:
>>
>>>  Questions about it:
>>>  Q) Does swap-prefetch help with this?
>>>  A) [From all reports I've seen (*)]
>>>  Yes, it does. 
>>
>> No it does not. If updatedb filled memory to the point of causing 
>> swapping (which noone is reproducing anyway) it HAS FILLED MEMORY and 
>> swap-prefetch hasn't any memory to prefetch into -- updatedb itself 
>> doesn't use any significant memory.
> 
> however there are other programs which are known to take up significant 
> amounts of memory and will cause the issue being described (openoffice 
> for example)
> 
> please don't get hung up on the text 'updatedb' and accept that there 
> are programs that do run intermittently and do use a significant amount 
> of ram and then free it.

Different issue. One that's worth pursueing perhaps, but a different issue 
from the VFS caches issue that people have been trying to track down.

Rene.
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