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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [PATCH 08 of 66] fix bad_page to show the real reason the page is bad
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References: <patchbomb.1288798055@v2.random> <412c4bbbe7738978ce73.1288798063@v2.random>
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Date: Tue,  9 Nov 2010 12:03:43 +0900 (JST)
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To: Andrea Arcangeli <aarcange@redhat.com>
Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm@kvack.org, Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org, Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, Dave Hansen <dave@linux.vnet.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@elte.hu>, Mike Travis <travis@sgi.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Christoph Lameter <cl@linux-foundation.org>, Chris Wright <chrisw@sous-sol.org>, bpicco@redhat.com, Balbir Singh <balbir@linux.vnet.ibm.com>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Johannes Weiner <hannes@cmpxchg.org>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>, Chris Mason <chris.mason@oracle.com>, Borislav Petkov <bp@alien8.de>
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> From: Andrea Arcangeli <aarcange@redhat.com>
> 
> page_count shows the count of the head page, but the actual check is done on
> the tail page, so show what is really being checked.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
> Acked-by: Rik van Riel <riel@redhat.com>
> Acked-by: Mel Gorman <mel@csn.ul.ie>
> ---
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5564,7 +5564,7 @@ void dump_page(struct page *page)
>  {
>  	printk(KERN_ALERT
>  	       "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
> -		page, page_count(page), page_mapcount(page),
> +		page, atomic_read(&page->_count), page_mapcount(page),
>  		page->mapping, page->index);
>  	dump_page_flags(page->flags);
>  }

Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>




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