linux-kernel - Re: [PATCHv9 02/36] rmap: add argument to charge compound page

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Message-ID: <55BB8A00.4070509@redhat.com>
Date:	Fri, 31 Jul 2015 16:45:20 +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 02/36] rmap: add argument to charge compound page

On 07/20/2015 04:20 PM, Kirill A. Shutemov wrote:
> We're going to allow mapping of individual 4k pages of THP compound
> page. It means we cannot rely on PageTransHuge() check to decide if
> map/unmap small page or THP.
> 
> The patch adds new argument to rmap functions to indicate whether we want
> to operate on whole compound page or only the small page.
> 
> 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: Vlastimil Babka <vbabka@...e.cz>

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

> ---
>  include/linux/rmap.h    | 12 +++++++++---
>  kernel/events/uprobes.c |  4 ++--
>  mm/huge_memory.c        | 16 ++++++++--------
>  mm/hugetlb.c            |  4 ++--
>  mm/ksm.c                |  4 ++--
>  mm/memory.c             | 14 +++++++-------
>  mm/migrate.c            |  8 ++++----
>  mm/rmap.c               | 48 +++++++++++++++++++++++++++++++-----------------
>  mm/swapfile.c           |  4 ++--
>  mm/userfaultfd.c        |  2 +-
>  10 files changed, 68 insertions(+), 48 deletions(-)



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