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

[Aubrey Li]

On 1/19/07, Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxxxxxxx> wrote:
> Hi Aubrey,
>
> The idea of creating separate flag for pagecache in page_alloc is
> interesting.  The good part is that you flag watermark low and the
> zone reclaimer will do the rest of the job.
>
> 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.
>
> One possible solution to this reclaim is to use scan control fields
> and ask the shrink_page_list() and shrink_active_list() routines to
> target only pagecache pages.  Pagecache pages are not mapped and
> they are easy to find on the LRU list.
>
> Please review my patch at http://lkml.org/lkml/2007/01/17/96

So you mean the existing reclaimer has the same issue, doesn't it?
In your and Roy's patch, balance_pagecache() routine is called on file
backed access.
So you still want to add this checking? or change the current
reclaimer completely?

-Aubrey
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