linux-kernel - Re: [PATCH 29/35] Do not store the PCP high and batch watermarks in the per-cpu structure

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Date:	Mon, 16 Mar 2009 12:30:02 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 29/35] Do not store the PCP high and batch watermarks in
 the per-cpu structure

On Mon, 16 Mar 2009, Mel Gorman wrote:

> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -166,8 +166,6 @@ static inline int is_unevictable_lru(enum lru_list l)
>
>  struct per_cpu_pages {
>  	int count;		/* number of pages in the list */
> -	int high;		/* high watermark, emptying needed */
> -	int batch;		/* chunk size for buddy add/remove */


There is a hole here on 64 bit systems.

>
>  	/* Lists of pages, one per migrate type stored on the pcp-lists */
>  	struct list_head lists[MIGRATE_PCPTYPES];
> @@ -285,6 +283,12 @@ struct zone {
>  		unsigned long pages_mark[3];
>  	};
>
> +	/* high watermark for per-cpu lists, emptying needed */
> +	u16 pcp_high;
> +
> +	/* chunk size for buddy add/remove to per-cpu lists*/
> +	u16 pcp_batch;
> +

Move this up to fill the hole?

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