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Date: Mon, 18 Aug 2014 09:06:30 +0900
From: Minchan Kim <minchan@kernel.org>
Subject: Re: [PATCH v14 5/8] s390: add pmd_[dirty|mkclean] for THP
Message-ID: <20140818000630.GA32075@bbox>
References: <1407981212-17818-1-git-send-email-minchan@kernel.org>
 <1407981212-17818-6-git-send-email-minchan@kernel.org>
 <20140814091614.4a0d5178@mschwide>
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To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Michael Kerrisk <mtk.manpages@gmail.com>, Linux API <linux-api@vger.kernel.org>, Hugh Dickins <hughd@google.com>, Johannes Weiner <hannes@cmpxchg.org>, Rik van Riel <riel@redhat.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Mel Gorman <mgorman@suse.de>, Jason Evans <je@fb.com>, Zhang Yanfei <zhangyanfei@cn.fujitsu.com>, "Kirill A. Shutemov" <kirill@shutemov.name>, Heiko Carstens <heiko.carstens@de.ibm.com>, Dominik Dingel <dingel@linux.vnet.ibm.com>, Christian Borntraeger <borntraeger@de.ibm.com>, linux-s390@vger.kernel.org, Gerald Schaefer <gerald.schaefer@de.ibm.com>

Hello,

On Thu, Aug 14, 2014 at 09:16:14AM +0200, Martin Schwidefsky wrote:
> On Thu, 14 Aug 2014 10:53:29 +0900
> Minchan Kim <minchan@kernel.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
> 
> The solution is already there, see git commit 152125b7a882df36.
> You can drop this patch.

Thanks for the heads up. I will drop it in next spin.
> 
> -- 
> blue skies,
>    Martin.
> 
> "Reality continues to ruin my life." - Calvin.
> 
> --
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-- 
Kind regards,
Minchan Kim

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