linux-kernel - Re: [patch 2/2] [PATCH] mm: Save soft-dirty bits on file pages

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Message-ID: <51F8C7F4.9020504@parallels.com>
Date:	Wed, 31 Jul 2013 12:16:52 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>, <akpm@...ux-foundation.org>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<luto@...capital.net>, <gorcunov@...nvz.org>, <mpm@...enic.com>,
	<xiaoguangrong@...ux.vnet.ibm.com>, <mtosatti@...hat.com>,
	<kosaki.motohiro@...il.com>, <sfr@...b.auug.org.au>,
	<peterz@...radead.org>, <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [patch 2/2] [PATCH] mm: Save soft-dirty bits on file pages

On 07/31/2013 12:41 AM, Cyrill Gorcunov wrote:

> Andy reported that if file page get reclaimed we loose soft-dirty bit
> if it was there, so save _PAGE_BIT_SOFT_DIRTY bit when page address
> get encoded into pte entry. Thus when #pf happens on such non-present
> pte we can restore it back.
> 
> Reported-by: Andy Lutomirski <luto@...capital.net>
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>

Acked-by: Pavel Emelyanov <xemul@...allels.com>
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