Re: [PATCH] Take anonymous pages off the LRU if we have no swap

Balbir Singh
2007-02-22T15:51:58Z

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