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From: Christoph Lameter <cl@linux.com>
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Subject: [Qemu-devel] Re: [RFC][PATCH 1/3] Linux/Guest unmapped page cache
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To: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: linux-mm@kvack.org, qemu-devel@nongnu.org, kvm@vger.kernel.org

On Wed, 3 Nov 2010, Balbir Singh wrote:

> > > +#define UNMAPPED_PAGE_RATIO 16
> >
> > Maybe come up with a scheme that allows better configuration of the
> > mininum? I think in some setting we may want an absolute limit and in
> > other a fraction of something (total zone size or working set?)
> >
>
> Are you suggesting a sysctl or computation based on zone size and
> limit, etc? I understand it to be the latter.

Do a computation based on zone size on startup and then allow the
user to modify the absolute size of the page cache?


Hmmm.. That would have to be per zone/node or somehow distributed over all
zones/nodes.