linux-kernel - Re: [PATCH 07/22] Calculate the preferred zone for allocation only once

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Message-Id: <20090423154834.bde33a72.akpm@linux-foundation.org>
Date:	Thu, 23 Apr 2009 15:48:34 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	mel@....ul.ie, linux-mm@...ck.org, kosaki.motohiro@...fujitsu.com,
	cl@...ux-foundation.org, npiggin@...e.de,
	linux-kernel@...r.kernel.org, ming.m.lin@...el.com,
	yanmin_zhang@...ux.intel.com, peterz@...radead.org,
	penberg@...helsinki.fi
Subject: Re: [PATCH 07/22] Calculate the preferred zone for allocation only
 once

On Wed, 22 Apr 2009 14:53:12 +0100
Mel Gorman <mel@....ul.ie> wrote:

> get_page_from_freelist() can be called multiple times for an allocation.
> Part of this calculates the preferred_zone which is the first usable zone
> in the zonelist but the zone depends on the GFP flags specified at the
> beginning of the allocation call. This patch calculates preferred_zone
> once. It's safe to do this because if preferred_zone is NULL at the start
> of the call, no amount of direct reclaim or other actions will change the
> fact the allocation will fail.
> 
>
> ...
>
> -	(void)first_zones_zonelist(zonelist, high_zoneidx, nodemask,
> -
>							&preferred_zone);
> ...  
>
> +	/* The preferred zone is used for statistics later */
> +	(void)first_zones_zonelist(zonelist, high_zoneidx, nodemask,

Let's quietly zap that dopey cast.

--- a/mm/page_alloc.c~page-allocator-calculate-the-preferred-zone-for-allocation-only-once-fix
+++ a/mm/page_alloc.c
@@ -1775,8 +1775,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, u
 		return NULL;
 
 	/* The preferred zone is used for statistics later */
-	(void)first_zones_zonelist(zonelist, high_zoneidx, nodemask,
-							&preferred_zone);
+	first_zones_zonelist(zonelist, high_zoneidx, nodemask, &preferred_zone);
 	if (!preferred_zone)
 		return NULL;
 
_

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