linux-kernel - Re: [PATCH 2/4] slqb: Record what node is local to a kmem_cache

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Message-ID: <alpine.DEB.1.10.0910011101390.3911@gentwo.org>
Date:	Thu, 1 Oct 2009 11:03:16 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <npiggin@...e.de>, heiko.carstens@...ibm.com,
	sachinp@...ibm.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Tejun Heo <tj@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 2/4] slqb: Record what node is local to a
 kmem_cache_cpu

On Thu, 1 Oct 2009, Mel Gorman wrote:

> True, it might have been improved more if SLUB knew what local hugepage it
> resided within as the kernel portion of the address space is backed by huge
> TLB entries. Note that SLQB could have an advantage here early in boot as
> the page allocator will tend to give it back pages within a single huge TLB
> entry. It loses the advantage when the system has been running for a very long
> time but it might be enough to skew benchmark results on cold-booted systems.

The page allocator serves pages aligned to huge page boundaries as far as
I can remember. You can actually use huge pages in slub if you set the max
order to 9. So a page obtained from the page allocator is always aligned
properly.


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