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

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Message-ID: <CALCETrXYnkonpBANnUuX+aJ=B=EYFwecZO27yrqcEU8WErz9DA@mail.gmail.com>
Date:	Wed, 24 Jul 2013 09:23:14 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Cyrill Gorcunov <gorcunov@...il.com>
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 swapped pages

On Wed, Jul 24, 2013 at 9:08 AM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> Andy Lutomirski reported that in case if a page with _PAGE_SOFT_DIRTY
> bit set get swapped out, the bit is getting lost and no longer
> available when pte read back.

Potentially silly question (due to my completely lack of understanding
of how swapping works in Linux): what about file-backed pages?
(Arguably these would be best supported by filesystems instead of by
the core vm, in which case it might make sense to drop soft-dirty
support for these pages entirely.)

--Andy
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