linux-kernel - Re: [PATCH v14 5/8] s390: add pmd

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Message-ID: <20140818000630.GA32075@bbox>
Date:	Mon, 18 Aug 2014 09:06:30 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.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>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Dominik Dingel <dingel@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-s390@...r.kernel.org,
	Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: Re: [PATCH v14 5/8] s390: add pmd_[dirty|mkclean] for THP

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@...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
> 
> 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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