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Date:	Thu, 23 Oct 2014 15:36:16 +0300
From:	"Kirill A. Shutemov" <>
To:	Peter Zijlstra <>
Subject: Re: [RFC][PATCH 3/6] mm: VMA sequence count

On Wed, Oct 22, 2014 at 03:44:16PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 22, 2014 at 02:15:54PM +0200, Peter Zijlstra wrote:
> > On Wed, Oct 22, 2014 at 02:53:04PM +0300, Kirill A. Shutemov wrote:
> > > Em, no. In this case change_protection() will not touch the pte, since
> > > it's pte_none() and the pte_same() check will pass just fine.
> > 
> > Oh, that's what you meant. Yes that's a problem, yes vm_page_prot
> > needs wrapping too.
> Maybe also vm_policy, is there anything else that can change while a vma
> lives?

 - vm_flags, obviously;
 - shared, anon_vma and anon_vma_chain (at least on the first write fault
   to private mapping);
 - vm_pgoff (mremap(2) ?);
 - vm_private_data -- it's all over drivers. Potential nightmare, but
   seems not in use for anon mappings.

 Kirill A. Shutemov
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