From: Balbir Singh <balbir@in.ibm.com>
To: Rik van Riel <riel@redhat.com>
Cc: Christoph Lameter <clameter@sgi.com>,
akpm@linux-foundation.org, linux-mm@kvack.org,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Subject: Re: [PATCH] Take anonymous pages off the LRU if we have no swap
Date: Thu, 22 Feb 2007 21:05:57 +0530 [thread overview]
Message-ID: <45DDB85D.209@in.ibm.com> (raw)
In-Reply-To: <45DD88E3.2@redhat.com>
Rik van Riel wrote:
> Christoph Lameter wrote:
>> On Wed, 21 Feb 2007, Rik van Riel wrote:
>>
> Absolutely. I am convinced that the whole "swappiness" thing
> of scanning past the anonymous pages in order to find the page
> cache pages will fall apart on 256GB systems even with somewhat
> friendly workloads.
>
That should probably make a good case for splitting the LRU
into unmapped and mapped page LRU's :-) I hope to get to it,
implement it and get some results.
A big global LRU is like a big piece of software that is requesting
to be broken up. Scanning through uninteresting pages (in my case
searching for pages belonging to particular container for my
memory controller) is a big overhead.
--
Warm Regards,
Balbir Singh
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next prev parent reply other threads:[~2007-02-22 15:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-21 22:12 [PATCH] Take anonymous pages off the LRU if we have no swap Christoph Lameter
2007-02-21 23:17 ` Rik van Riel
2007-02-22 0:06 ` Christoph Lameter
2007-02-22 2:17 ` Rik van Riel
2007-02-22 3:09 ` Christoph Lameter
2007-02-22 12:13 ` Rik van Riel
2007-02-22 15:35 ` Balbir Singh [this message]
2007-02-22 17:04 ` Rik van Riel
2007-02-22 17:21 ` Paul Menage
2007-02-22 18:45 ` Christoph Lameter
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