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SubjectRe: [PATCH 3/3] Provide control over unmapped pages (v4)
* MinChan Kim <minchan.kim@gmail.com> [2011-01-28 16:24:19]:

> >
> > But the assumption for LRU order to change happens only if the page
> > cannot be successfully freed, which means it is in some way active..
> > and needs to be moved no?
>
> 1. holded page by someone
> 2. mapped pages
> 3. active pages
>
> 1 is rare so it isn't the problem.
> Of course, in case of 3, we have to activate it so no problem.
> The problem is 2.
>

2 is a problem, but due to the size aspects not a big one. Like you
said even lumpy reclaim affects it. May be the reclaim code could
honour may_unmap much earlier.

--
Three Cheers,
Balbir


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