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

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Date:	Sun, 28 Jul 2013 01:01:43 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] mm: Save soft-dirty bits on file pages

On Sat, Jul 27, 2013 at 10:06:01AM -0700, Andy Lutomirski wrote:
> 
> That being said, a MAP_PRIVATE, un-cowed mapping must be clean -- if
> it had been (soft-)dirtied, it would also have been cowed.  So you
> might be okay.

Yas, as far as I know we are either cow'ed or in clean state, thus
either soft-bit set on #pf (and when reclaimed rest in file-pte)
or it remains clean and there is no change we need to track.
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