linux-kernel - Re: [QUICKLIST 1/4] Quicklists for page table pages V5

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Message-ID: <17948.29982.857777.776522@cargo.ozlabs.ibm.com>
Date:	Wed, 11 Apr 2007 15:41:50 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Christoph Lameter <clameter@....com>, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, ak@...e.de
Subject: Re: [QUICKLIST 1/4] Quicklists for page table pages V5

Benjamin Herrenschmidt writes:

> > > For a 64K page size kernel, we have 3 level page tables and we use 3
> > > caches: a PGD pages are 128 bytes (yeah, not big heh...), our pmd
> > > pages are 32K (half a page) and PTE pages are PAGE_SIZE (64K).
> > 
> > Ok so use quicklists for the PTEs and slab for the rest? A PGD of only 128 
> > bytes? Stuff one at the end of the mm_struct or the task struct? That way 
> > you can avoid allocation overhead.
> 
> Yeah, maybe... I need to think about it a bit more. I might be able to
> make the PMD a full page too.

There was a reason for making the PMD level map 256MB.  I'd have to
remember what that was and make sure it didn't apply any more first...

Paul.
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