linux-kernel - Re: [RFC] Replace the watermark-related union in struct zone with a watermark[] array V2

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Date:	Wed, 13 May 2009 17:31:55 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Replace the watermark-related union in struct zone with a watermark[] array V2

> Changelog since V1
>   o Use N_wmark_pages accessors instead of array accesses
> 
> Patch page-allocator-use-allocation-flags-as-an-index-to-the-zone-watermark
> from -mm added a union to struct zone where the watermarks could be accessed
> with either zone->pages_* or a pages_mark array. The concern was that this
> aliasing caused more confusion that it helped.
> 
> This patch replaces the union with a watermark array that is indexed with
> WMARK_* defines accessed via helpers. All call sites that use zone->pages_*
> are updated to use the helpers for accessing the values and the array
> offsets for setting.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>

looks good to me :)




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