linux-kernel - Re: larger default page sizes...

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Message-ID: <ed5aea430803251734u70f199w10951bc4f0db6262@mail.gmail.com>
Date:	Tue, 25 Mar 2008 18:34:13 -0600
From:	"David Mosberger-Tang" <dmosberger@...il.com>
To:	"Peter Chubb" <peterc@...ato.unsw.edu.au>
Cc:	"David Miller" <davem@...emloft.net>, clameter@....com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, torvalds@...ux-foundation.org,
	ianw@...ato.unsw.edu.au
Subject: Re: larger default page sizes...

On Tue, Mar 25, 2008 at 5:41 PM, Peter Chubb <peterc@...ato.unsw.edu.au> wrote:
>  The main issue is that, at least on Itanium, you have to turn off the hardware
>  page table walker for hugepages if you want to mix superpages and
>  standard pages in the same region. (The long format VHPT isn't the
>  panacea we'd like it to be because the hash function it uses depends
>  on the page size).

Why not just repeat the PTEs for super-pages?  That won't work for
huge pages, but for superpages that are a reasonable multiple (e.g.,
16-times) the base-page size, it should work nicely.

  --david
-- 
Mosberger Consulting LLC, http://www.mosberger-consulting.com/
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