[Xen-devel] Re: [RFC][PATCH]Large Page Support for HAP

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 15/11/07 16:26, "Huang2, Wei" <Wei.Huang2@xxxxxxx> wrote:

> I implemented a preliminary version of HAP large page support. My testings showed that 32bit PAE and 64bit worked well. Also I saw decent performance improvement for certain benchmarks.
>  
> So before I go too far, I send this patch to community for reviews/comments. This patch goes with xen-unstable changeset 16281. I will redo it after collecting all ideas.

Looks pretty good to me.

To get round the 2M/4M distinction I’d write code in terms of ‘normal page’ and ‘super page’, where the former is order 0 and the latter is order L2_SUPERPAGE_ORDER (or somesuch name). I would try to avoid referencing 2M or 4M explicitly as much as possible.

Having to shatter the 0-2MB region for the VGA RAM hole is a shame, but I suppose there’s no way round that really.

 -- Keir



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