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Date:	Tue, 7 Oct 2014 14:10:26 +0300
From:	"Kirill A. Shutemov" <>
To:	Andrea Arcangeli <>
Cc:,,,,, Robert Love <>,
	Dave Hansen <>, Jan Kara <>,
	Neil Brown <>,
	Stefan Hajnoczi <>,
	Andrew Jones <>,
	KOSAKI Motohiro <>,
	Michel Lespinasse <>,
	Taras Glek <>,
	Juan Quintela <>,
	Hugh Dickins <>,
	Isaku Yamahata <>,
	Mel Gorman <>,
	Sasha Levin <>,
	Android Kernel Team <>,
	"\\\"Dr. David Alan Gilbert\\\"" <>,
	"Huangpeng (Peter)" <>,
	Andres Lagar-Cavilla <>,
	Christopher Covington <>,
	Anthony Liguori <>,
	Paolo Bonzini <>,
	Keith Packard <>,
	Wenchao Xia <>,
	Andy Lutomirski <>,
	Minchan Kim <>,
	Dmitry Adamushko <>,
	Johannes Weiner <>,
	Mike Hommey <>,
	Andrew Morton <>,
	Linus Torvalds <>,
	Peter Feiner <>
Subject: Re: [Qemu-devel] [PATCH 10/17] mm: rmap preparation for

On Fri, Oct 03, 2014 at 07:08:00PM +0200, Andrea Arcangeli wrote:
> There's one constraint enforced to allow this simplification: the
> source pages passed to remap_anon_pages must be mapped only in one
> vma, but this is not a limitation when used to handle userland page
> faults with MADV_USERFAULT. The source addresses passed to
> remap_anon_pages should be set as VM_DONTCOPY with MADV_DONTFORK to
> avoid any risk of the mapcount of the pages increasing, if fork runs
> in parallel in another thread, before or while remap_anon_pages runs.

Have you considered triggering COW instead of adding limitation on
pages' mapcount? The limitation looks artificial from interface POV.

 Kirill A. Shutemov
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