linux-kernel - Re: [PATCH 3.11 54/66] mm: migration: do not lose soft dirty bit if page is in migration state

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Message-ID: <20131127115052.GX29824@moon>
Date:	Wed, 27 Nov 2013 15:50:52 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	William Dauchy <wdauchy@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org, Pavel Emelyanov <xemul@...allels.com>,
	Andy Lutomirski <luto@...capital.net>,
	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>,
	Peter Zijlstra <peterz@...radead.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3.11 54/66] mm: migration: do not lose soft dirty bit if
 page is in migration state

On Wed, Nov 27, 2013 at 12:38:10PM +0100, William Dauchy wrote:
> Hi Greg,
> 
> I was wondering if v3.10.x stable branch was also concerned by this
> patch since I did not found it in this later branch.
> Maybe too hard to backport? (I saw that it requires new functions like
> pte_swp_soft_dirty which is not present in v3.10.x)
> Maybe it was planned in the future?

"Soft dirty bit" feature introduced in 3.11 kernel and as far as I know
we've no plans to backport it on 3.10 series.
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