linux-kernel - Re: updatedb

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Message-ID: <46A854C7.4060908@gmail.com>
Date:	Thu, 26 Jul 2007 10:01:11 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Bongani Hlope <bhlope@...b.co.za>
CC:	Robert Deaton <false.hopes@...il.com>,
	linux-kernel@...r.kernel.org, ck list <ck@....kolivas.org>,
	linux-mm@...ck.org
Subject: Re: updatedb

On 07/26/2007 09:08 AM, Bongani Hlope wrote:

> On Thursday 26 July 2007 08:56:59 Rene Herman wrote:

>> Great. Now concentrate on the "swpd" column, as it's the only thing 
>> relevant here. The fact that an updatedb run fills/replaces caches is 
>> completely and utterly unsurprising and not something swap-prefetch
>> helps with. The only thing it does is bring back stuff from _swap_.
> 
> ;)
> 
> I have 2Gb of RAM and I never ever touched swap on all my work loads. I
> was just showing the behavior of updatedb on my desktop. I have never
> even looked at the swap-prefetch patch (for obvious reasons).

I see... thanks for the report :)

> I think people should also look at their /proc/sys/vm/overcommit_ratio

In the sense that current stuff might be evicted earlier with no or little 
overcommit?

Rene.

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