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