linux-kernel - Re: [QUICKLIST 1/5] Quicklists for page table pages V3

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Message-Id: <20070319170741.5a24af4c.akpm@linux-foundation.org>
Date:	Mon, 19 Mar 2007 17:07:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-mm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 1/5] Quicklists for page table pages V3

On Mon, 19 Mar 2007 16:57:55 -0700 (PDT)
Christoph Lameter <clameter@....com> wrote:

> On Mon, 19 Mar 2007, Andrew Morton wrote:
> 
> > Has it been proven that quicklists are superior to simply going direct to the
> > page allocator for these pages?
> 
> Yes.

Sigh.

Please provide proof that quicklists are superior to simply going direct to
the page allocator for these pages.

> > Would it provide a superior solution if we were to a) stop zeroing out the
> > pte's when doing a fullmm==1 teardown and b) go direct to the page allocator
> > for these pages?
> 
> I doubt it. The zeroing is a by product of our way of serializing pte 
> handling. Its going to be difficult to change that.

Nick didn't think so, and I don't see the problem either.

We'll save on some bus traffic by avoiding the writeback, but how much
effect that will have we don't know.  Presumably little.

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