linux-kernel - Re: [QUICKLIST 1/5] Quicklists for page table pages V4

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Message-Id: <20070323222133.f17090cf.akpm@linux-foundation.org>
Date:	Fri, 23 Mar 2007 22:21:33 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 1/5] Quicklists for page table pages V4

On Fri, 23 Mar 2007 10:54:12 -0700 (PDT) Christoph Lameter <clameter@....com> wrote:

> Here are the results of aim9 tests on x86_64. There are some minor performance 
> improvements and some fluctuations.

There are a lot of numbers there - what do they tell us?

> 2.6.21-rc4 bare
> 2.6.21-rc4 x86_64 quicklist

So what has changed here?  From a quick look it appears that x86_64 is
using get_zeroed_page() for ptes, puds and pmds and is using a custom
quicklist for pgds.

After your patches, x86_64 is using a common quicklist allocator for puds,
pmds and pgds and continues to use get_zeroed_page() for ptes.

Or something totally different, dunno.  I tire.

My question is pretty simple: how do we justify the retention of this
custom allocator?

Because simply removing it is the preferable way of fixing the SLUB
problem.
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