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Date: Mon, 7 Jul 2014 17:31:43 +0200
From: Gerald Schaefer <gerald.schaefer@...ibm.com>
To: Minchan Kim <minchan@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Michael Kerrisk <mtk.manpages@...il.com>,
Linux API <linux-api@...r.kernel.org>,
Hugh Dickins <hughd@...gle.com>,
Johannes Weiner <hannes@...xchg.org>,
Rik van Riel <riel@...hat.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Mel Gorman <mgorman@...e.de>, Jason Evans <je@...com>,
Zhang Yanfei <zhangyanfei@...fujitsu.com>,
"Kirill A. Shutemov" <kirill@...temov.name>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Dominik Dingel <dingel@...ux.vnet.ibm.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
linux-s390@...r.kernel.org
Subject: Re: [PATCH v10 5/7] s390: add pmd_[dirty|mkclean] for THP
On Mon, 7 Jul 2014 09:53:56 +0900
Minchan Kim <minchan@...nel.org> wrote:
> MADV_FREE needs pmd_dirty and pmd_mkclean for detecting recent
> overwrite of the contents since MADV_FREE syscall is called for
> THP page but for s390 pmds only referenced bit is available
> because there is no free bit left in the pmd entry for the
> software dirty bit so this patch adds dumb pmd_dirty which
> returns always true by suggesting by Martin.
>
> They finally find a solution in future.
> http://marc.info/?l=linux-api&m=140440328820808&w=2
>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: Gerald Schaefer <gerald.schaefer@...ibm.com>
> Cc: Dominik Dingel <dingel@...ux.vnet.ibm.com>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> Cc: linux-s390@...r.kernel.org
> Signed-off-by: Minchan Kim <minchan@...nel.org>
> ---
> arch/s390/include/asm/pgtable.h | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
Acked-by: Gerald Schaefer <gerald.schaefer@...ibm.com>
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