linux-kernel - Re: [RFC PATCH 1/5] mm/page_ext: resurrect struct page extending code for debugging

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Date:	Wed, 12 Nov 2014 08:33:40 -0800
From:	Dave Hansen <dave@...1.net>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Mel Gorman <mgorman@...e.de>, Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>,
	Alexander Nyberg <alexn@....su.se>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Jungsoo Son <jungsoo.son@....com>,
	Ingo Molnar <mingo@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/5] mm/page_ext: resurrect struct page extending
 code for debugging

On 11/12/2014 12:27 AM, Joonsoo Kim wrote:
> @@ -1092,6 +1096,14 @@ struct mem_section {
>  
>  	/* See declaration of similar field in struct zone */
>  	unsigned long *pageblock_flags;
> +#ifdef CONFIG_PAGE_EXTENSION
> +	/*
> +	 * If !SPARSEMEM, pgdat doesn't have page_ext pointer. We use
> +	 * section. (see page_ext.h about this.)
> +	 */
> +	struct page_ext *page_ext;
> +	unsigned long pad;
> +#endif

Will the distributions be amenable to enabling this?  If so, I'm all for
it if it gets us things like page_owner at runtime.

If not, this becomes of much more questionable utility.
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