Re: [RPC][PATCH 2.6.20-rc5] limit total vfs page cache

[Christoph Lameter]

On Sat, 20 Jan 2007, Vaidyanathan Srinivasan wrote:

> >> However when the zone reclaimer starts to reclaim pages, it will
> >> remove all cold pages and not specifically pagecache pages.  This
> >> may affect performance of applications.

The reclaimer is passed a control structure that can be used to disable
write to swap (if that is the concern).

> I am open to suggestions on reclaim logic.  My view is that we need
> to selectively reclaim pagecache pages and not just call the
> traditional reclaimer to freeup arbitrary type of pages.

The traditional reclaim works fine if told what to do. Introducing another 
LRU list to do reclaim is a significant change to the VM, creates lots of
overhead etc.
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