Re: [rfc][patch 2/2] mm: mlocked pages off LRU

[Rik van Riel <riel@redhat.com>]

Christoph Lameter wrote:
> On Tue, 6 Mar 2007, Nick Piggin wrote:
> 
>>> The above is a bit contradictory. Assuming they are taken off the LRU:
>>> How will they be returned to the LRU?
>> In what way is it contradictory? If they are mlocked, we put them on the
>> LRU when they get munlocked. If they are off the LRU due to a !swap condition,
>> then we put them back on the LRU by whatever mechanism that uses (eg. a
>> 3rd LRU list that we go through much more slowly...).
> 
> Ok how are we going to implement the 3rd LRU for non mlocked anonymous 
> pages if you use the lru for the refcounter field? Another page flags bit? 

I'm working on it, in-between my other duties.  A separate set
of LRU lists for file backed pages vs swap backed/anon pages.

I think I'm about halfway done with the patch now - I'm amazed
how much stuff changed in the VM since I got abducted to work
on Xen...

http://linux-mm.org/PageReplacementDesign

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