linux-kernel - Re: [PATCHv9 27/36] mm: differentiate page_mapped() from page

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Message-ID: <55BB8E97.4040005@redhat.com>
Date:	Fri, 31 Jul 2015 17:04:55 +0200
From:	Jerome Marchand <jmarchan@...hat.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
CC:	Dave Hansen <dave.hansen@...el.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv9 27/36] mm: differentiate page_mapped() from page_mapcount()
 for compound pages

On 07/20/2015 04:21 PM, Kirill A. Shutemov wrote:
> Let's define page_mapped() to be true for compound pages if any
> sub-pages of the compound page is mapped (with PMD or PTE).
> 
> On other hand page_mapcount() return mapcount for this particular small
> page.
> 
> This will make cases like page_get_anon_vma() behave correctly once we
> allow huge pages to be mapped with PTE.
> 
> Most users outside core-mm should use page_mapcount() instead of
> page_mapped().
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Tested-by: Sasha Levin <sasha.levin@...cle.com>
> Tested-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Acked-by: Jerome Marchand <jmarchan@...hat.com>

> ---
>  arch/arc/mm/cache_arc700.c |  4 ++--
>  arch/arm/mm/flush.c        |  2 +-
>  arch/mips/mm/c-r4k.c       |  3 ++-
>  arch/mips/mm/cache.c       |  2 +-
>  arch/mips/mm/init.c        |  6 +++---
>  arch/sh/mm/cache-sh4.c     |  2 +-
>  arch/sh/mm/cache.c         |  8 ++++----
>  arch/xtensa/mm/tlb.c       |  2 +-
>  fs/proc/page.c             |  4 ++--
>  include/linux/mm.h         | 15 +++++++++++++--
>  mm/filemap.c               |  2 +-
>  11 files changed, 31 insertions(+), 19 deletions(-)
> 



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