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

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Date:	Thu, 13 Nov 2014 15:40:35 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Dave Hansen <dave@...1.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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 Wed, Nov 12, 2014 at 08:33:40AM -0800, Dave Hansen wrote:
> 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.

Yes, I hope so.
At least, I can make it default to our product. But, how distributions
will do is beyond my power. :)

Thanks.
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