linux-kernel - Re: [PATCH] thp: fix huge zero page logic for page with pfn == 0

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Message-ID: <20130417151041.GA25659@redhat.com>
Date:	Wed, 17 Apr 2013 17:10:42 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH] thp: fix huge zero page logic for page with pfn == 0

On Wed, Apr 17, 2013 at 06:07:33PM +0300, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> 
> Current implementation of huge zero page uses pfn value 0 to indicate
> that the page hasn't allocated yet. It assumes that buddy page allocator
> can't return page with pfn == 0.
> 
> Let's rework the code to store 'struct page *' of huge zero page, not
> its pfn. This way we can avoid the weak assumption.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Reported-by: Minchan Kim <minchan@...nel.org>
> Acked-by: Minchan Kim <minchan@...nel.org>
> ---
>  mm/huge_memory.c |   43 +++++++++++++++++++++----------------------
>  1 file changed, 21 insertions(+), 22 deletions(-)

Reviewed-by: Andrea Arcangeli <aarcange@...hat.com>
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