Messages in this thread | | | Date | Fri, 01 May 2009 16:05:55 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH] vmscan: evict use-once pages first (v2) |
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Andrew Morton wrote: > On Fri, 01 May 2009 10:05:53 -0400 > Rik van Riel <riel@redhat.com> wrote:
>> This means we need to provide our working set protection >> on a per-list basis, by tweaking the scan rate or avoiding >> scanning of the active file list alltogether under certain >> conditions. >> >> As a side effect, this will help protect frequently accessed >> file pages (good for ftp and nfs servers), indirect blocks, >> inode buffers and other frequently used metadata. > > Yeah, but that's all internal-implementation-of-the-day details. It > just doesn't matter how the sausages are made. What we have learned is > that the policy of retaining mapped pages over unmapped pages, *all > other things being equal* leads to a more pleasing system.
Well, retaining mapped pages is one of the implementations that lead to a more pleasing system.
I suspect that a fully scan resistant active file list will show the same behaviour, as well as a few other desired behaviours that come in very handy in various server loads.
Are you open to evaluating other methods that could lead, on desktop systems, to a behaviour similar to the one achieved by the preserve-mapped-pages mechanism?
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