linux-kernel - Re: [PATCH 4/6] Have zonelist contains structs with both a zone pointer and zone

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Message-ID: <alpine.DEB.0.9999.0710162022220.2326@chino.kir.corp.google.com>
Date:	Tue, 16 Oct 2007 20:22:55 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Mel Gorman <mel@....ul.ie>
cc:	akpm@...ux-foundation.org, Lee.Schermerhorn@...com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kamezawa.hiroyu@...fujitsu.com, clameter@....com
Subject: Re: [PATCH 4/6] Have zonelist contains structs with both a zone
 pointer and zone_idx

On Fri, 28 Sep 2007, Mel Gorman wrote:

> 
> Filtering zonelists requires very frequent use of zone_idx(). This is costly
> as it involves a lookup of another structure and a substraction operation. As
> the zone_idx is often required, it should be quickly accessible.  The node
> idx could also be stored here if it was found that accessing zone->node is
> significant which may be the case on workloads where nodemasks are heavily
> used.
> 
> This patch introduces a struct zoneref to store a zone pointer and a zone
> index.  The zonelist then consists of an array of this struct zonerefs which
> are looked up as necessary. Helpers are given for accessing the zone index
> as well as the node index.
> 
> [kamezawa.hiroyu@...fujitsu.com: Suggested struct zoneref instead of embedding information in pointers]
> Signed-off-by: Mel Gorman <mel@....ul.ie>
> Acked-by: Christoph Lameter <clameter@....com>

OOM locking looks good, thanks.

Acked-by: David Rientjes <rientjes@...gle.com>
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