linux-kernel - Re: [PATCH 3/3] page-allocator: Move pcp static fields for high and batch off-pcp and onto the zone

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Message-ID: <alpine.DEB.1.10.0908181355490.3840@gentwo.org>
Date:	Tue, 18 Aug 2009 13:56:22 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
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: [PATCH 3/3] page-allocator: Move pcp static fields for high and
 batch off-pcp and onto the zone

On Tue, 18 Aug 2009, Mel Gorman wrote:

> On Tue, Aug 18, 2009 at 10:18:48AM -0400, Christoph Lameter wrote:
> >
> > This will increase the cache footprint for the hot code path. Could these
> > new variable be moved next to zone fields that are already in use there?
> > The pageset array is used f.e.
> >
>
> pageset is ____cacheline_aligned_in_smp so putting pcp->high/batch near
> it won't help in terms of cache footprint. This is why I located it near
> watermarks because it's known they'll be needed at roughly the same time
> pcp->high/batch would be normally accessed.

watermarks are not accessed from the hot code path in free_hot_cold page.
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