linux-kernel - Re: [PATCH] mm: hugetlb: avoid bogus counter of surplus huge page

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Date:	Tue, 27 Dec 2011 13:57:01 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Hillf Danton <dhillf@...il.com>
Cc:	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] mm: hugetlb: avoid bogus counter of surplus huge page

On Fri 23-12-11 21:38:38, Hillf Danton wrote:
> From: Hillf Danton <dhillf@...il.com>
> Subject: [PATCH] mm: hugetlb: avoid bogus counter of surplus huge page
> 
> If we have to hand back the newly allocated huge page to page allocator,
> for any reason, the changed counter should be recovered.
> 
> Cc: Michal Hocko <mhocko@...e.cz>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Hillf Danton <dhillf@...il.com>

Broken since 2.6.27 (caff3a2c: hugetlb: call arch_prepare_hugepage() for
surplus pages) so a stable material

Reviewed-by: Michal Hocko <mhocko@...e.cz>

Thanks
> ---
> 
> --- a/mm/hugetlb.c	Tue Dec 20 21:26:30 2011
> +++ b/mm/hugetlb.c	Fri Dec 23 21:18:06 2011
> @@ -800,7 +800,7 @@ static struct page *alloc_buddy_huge_pag
> 
>  	if (page && arch_prepare_hugepage(page)) {
>  		__free_pages(page, huge_page_order(h));
> -		return NULL;
> +		page = NULL;
>  	}
> 
>  	spin_lock(&hugetlb_lock);
> --
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-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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