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

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Message-ID: <Pine.LNX.4.64.0709121415350.3130@schroedinger.engr.sgi.com>
Date:	Wed, 12 Sep 2007 14:17:32 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@....ul.ie>
cc:	Lee.Schermerhorn@...com, kamezawa.hiroyu@...fujitsu.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 4/6] Have zonelist contains structs with both a zone
 pointer and zone_idx

On Wed, 12 Sep 2007, Mel Gorman wrote:

>  /*
> + * This struct contains information about a zone in a zonelist. It is stored
> + * here to avoid dereferences into large structures and lookups of tables
> + */
> +struct zoneref {
> +	struct zone *zone;	/* Pointer to actual zone */
> +	int zone_idx;		/* zone_idx(zoneref->zone) */
> +};

Well the structure is going to be 12 bytes wide. Since pointers have to be 
aligned to 8 bytes we will effectively have to use 16 bytes anyways. There 
is no additional memory use if we would be adding another 4 bytes.

But lets get this merged. We can sort this out later. Too many 
oscillations already.
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