linux-kernel - Re: [PATCH 3/3] mm: adjust rss counters for migration entiries

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Date:	Wed, 25 Jan 2012 16:20:35 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mm: adjust rss counters for migration entiries

On Wed, 25 Jan 2012 15:01:38 -0800 (PST)
Hugh Dickins <hughd@...gle.com> wrote:

> > > > : From: Konstantin Khlebnikov<khlebnikov@...nvz.org>
> > > > : Subject: mm: postpone migrated page mapping reset
> > > > :
> > > > : Postpone resetting page->mapping until the final
> > > > remove_migration_ptes().
> > > > : Otherwise the expression PageAnon(migration_entry_to_page(entry)) does
> > > > not
> > > > : work.
> > > > :
> > > > : Signed-off-by: Konstantin Khlebnikov<khlebnikov@...nvz.org>
> > > > : Cc: Hugh Dickins<hughd@...gle.com>
> > > > : Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
> > > 
> > > Isn't this one actually an essential part of the fix?  It should have
> > > been part of the same patch, but you split them apart, now Andrew has
> > > reordered them and pushed one part to 3.3, but this needs to go in too?
> > > 
> > 
> > Oops. I missed that. Yes. race-fix does not work for anon-memory without that
> > patch.
> > But this is non-fatal, there are no new bugs.
> 
> Non-fatal and no new bug, yes, but it makes the fix which has already
> gone in rather less of a fix than was intended (it'll get the total right,
> but misreport anon as file).  Andrew, please add this one to your next
> push to Linus - thanks.

Shall do.
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