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[Xen-devel] Re: Hugepages don't work on the Xen Linux git tree
| To: | Dave McCracken <dcm@xxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: Hugepages don't work on the Xen Linux git tree |
| From: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
| Date: | Tue, 20 Apr 2010 11:17:09 -0700 |
| Cc: | Xen Developers List <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 20 Apr 2010 11:18:03 -0700 |
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On 04/19/2010 07:27 PM, Dave McCracken wrote:
> The fix I have in older kernels is for set_huge_pte_at() to call set_pmd()
> instead. However, in this brave new world of paravirt vectors, should I
> instead set up a vector for it? What is the architecturally right thing to
> do? However we decide to do it, expect a patch for it shortly afterward.
>
Yeah, its a bit awkward. A huge pte is semantically a pte, but
structurally a pmd, so which should it be? The perhaps "cleanest" fix
might be to add a set of huge pte operators, but I don't think that's
really justified given that this is a fairly specific, narrow case.
I think on balance the best thing is to make set_huge_pte_at() call
set_pmd().
J
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