linux-kernel - Re: [RFC PATCH 0/3] Reduce searching in the page allocator fast-path

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Message-ID: <20090818165340.GB13435@csn.ul.ie>
Date:	Tue, 18 Aug 2009 17:53:41 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/3] Reduce searching in the page allocator
	fast-path

On Tue, Aug 18, 2009 at 10:22:01AM -0400, Christoph Lameter wrote:
> 
> This could be combined with the per cpu ops patch that makes the page
> allocator use alloc_percpu for its per cpu data needs. That in turn would
> allow the use of per cpu atomics in the hot paths, maybe we can
> get to a point where we can drop the irq disable there.
> 

It would appear that getting rid of IRQ disabling and using per-cpu-atomics
would be a problem independent of searching the free lists. Either would
be good, both would be better or am I missing something that makes them
mutually exclusive?

Can you point me to which patchset you are talking about specifically that
uses per-cpu atomics in the hot path? There are a lot of per-cpu patches
related to you that have been posted in the last few months and I'm not sure
what any of their merge status' is.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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