linux-kernel - Re: quicklists confuse meminfo

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Message-ID: <Pine.LNX.4.64.0803100851560.23575@schroedinger.engr.sgi.com>
Date:	Mon, 10 Mar 2008 08:54:48 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Ingo Molnar <mingo@...e.hu>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bart Van Assche <bart.vanassche@...il.com>
Subject: Re: quicklists confuse meminfo

On Sun, 9 Mar 2008, Andrew Morton wrote:

> - They are pretty marginal from a performance POV (iirc)

Pretty significant in our experience.

>   Making __GFP_ZERO smarter/more efficient would be a preferable way of
>   addressing any performance problems we have in there.

Looking at the page allocator "fastpath": The basic reaons that this was 
such a good optimization was that the page allocator is expensive to call. 
The hotpath gets more and more clogged with logic. Fixing the page 
allocator to be more efficient may be the right approach here. That could 
also include having a list of zeroed pages.

Zeroed pages however will not address the issue of having initialized pgd 
(which seems to be what i386 needs).

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