linux-kernel - Re: [patch 1/2] [PATCH] mm: Save soft-dirty bits on swapped pages

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Date:	Thu, 1 Aug 2013 15:37:06 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	luto@...capital.net, xemul@...allels.com,
	akpm@...ux-foundation.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 1/2] [PATCH] mm: Save soft-dirty bits on swapped pages

On Thu, Aug 01, 2013 at 10:28:14AM +0400, Cyrill Gorcunov wrote:
> On Thu, Aug 01, 2013 at 03:16:32PM +0900, Minchan Kim wrote:
> > 
> > I don't get it. Could you correct me with below example?
> > 
> > Process A context
> >         try_to_unmap
> >                 swp_pte = swp_entry_to_pte /* change generic swp into arch swap */
> >                 swp_pte = pte_swp_mksoft_dirty(swp_pte);
> >                 set_pte_at(, swp_pte);
> > 
> > Process A context
> >         ..
> >         mincore_pte_range
> 		pte_t pte = *ptep;	<-- local copy of the pte value, in memory it remains the same
> 						with swap softdirty bit set

Argh, I missed that. Thank you!

Reviewed-by: Minchan Kim <minchan@...nel.org>
-- 
Kind regards,
Minchan Kim
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