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

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Message-ID: <alpine.DEB.2.00.0904271340320.11972@chino.kir.corp.google.com>
Date:	Mon, 27 Apr 2009 13:48:47 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Mel Gorman <mel@....ul.ie>
cc:	Linux Memory Management List <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Replace the watermark-related union in struct zone with
 a watermark[] array

On Mon, 27 Apr 2009, Mel Gorman wrote:

> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index c1fa208..1ff59fd 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -163,6 +163,13 @@ static inline int is_unevictable_lru(enum lru_list l)
>  #endif
>  }
>  
> +enum zone_watermarks {
> +	WMARK_MIN,
> +	WMARK_LOW,
> +	WMARK_HIGH,
> +	NR_WMARK
> +};
> +
>  struct per_cpu_pages {
>  	int count;		/* number of pages in the list */
>  	int high;		/* high watermark, emptying needed */
> @@ -275,12 +282,9 @@ struct zone_reclaim_stat {
>  
>  struct zone {
>  	/* Fields commonly accessed by the page allocator */
> -	union {
> -		struct {
> -			unsigned long	pages_min, pages_low, pages_high;
> -		};
> -		unsigned long pages_mark[3];
> -	};
> +
> +	/* zone watermarks, indexed with WMARK_LOW, WMARK_MIN and WMARK_HIGH */
> +	unsigned long watermark[NR_WMARK];
>  
>  	/*
>  	 * We don't know if the memory that we're going to allocate will be freeable

I thought the suggestion was for something like

	#define zone_wmark_min(z)	(z->pages_mark[WMARK_MIN])
	...
--
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