linux-kernel - Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer

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Date:	Thu, 9 Aug 2007 14:37:09 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@....ul.ie>
cc:	Lee.Schermerhorn@...com, ak@...e.de, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones
 pointer

On Thu, 9 Aug 2007, Mel Gorman wrote:

>  }
>  
> +#if defined(CONFIG_SMP) && INTERNODE_CACHE_SHIFT > ZONES_SHIFT

Is this necessary? ZONES_SHIFT is always <= 2 so it will work with 
any pointer. Why disable this for UP?

> --- linux-2.6.23-rc1-mm2-010_use_zonelist/mm/vmstat.c	2007-08-07 14:45:11.000000000 +0100
> +++ linux-2.6.23-rc1-mm2-015_zoneid_zonelist/mm/vmstat.c	2007-08-09 15:52:12.000000000 +0100
> @@ -365,11 +365,11 @@ void refresh_cpu_vm_stats(int cpu)
>   */
>  void zone_statistics(struct zonelist *zonelist, struct zone *z)
>  {
> -	if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) {
> +	if (z->zone_pgdat == zonelist_zone(zonelist->_zones[0])->zone_pgdat) {
>  		__inc_zone_state(z, NUMA_HIT);
>  	} else {
>  		__inc_zone_state(z, NUMA_MISS);
> -		__inc_zone_state(zonelist->zones[0], NUMA_FOREIGN);
> +		__inc_zone_state(zonelist_zone(zonelist->_zones[0]), NUMA_FOREIGN);
>  	}
>  	if (z->node == numa_node_id())
>  		__inc_zone_state(z, NUMA_LOCAL);

Hmmmm. I hope the compiler does subexpression optimization on 

	zonelist_zone(zonelist->_zones[0]) 

Acked-by: Christoph Lameter <clameter@....com>

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