linux-kernel - Re: [RFC][PATCH 3/6] mm: VMA sequence count

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Message-ID: <20141023123616.GA8809@node.dhcp.inet.fi>
Date:	Thu, 23 Oct 2014 15:36:16 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	tglx@...utronix.de, akpm@...ux-foundation.org, riel@...hat.com,
	mgorman@...e.de, oleg@...hat.com, mingo@...hat.com,
	minchan@...nel.org, kamezawa.hiroyu@...fujitsu.com,
	viro@...iv.linux.org.uk, laijs@...fujitsu.com, dave@...olabs.net,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
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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