Messages in this thread | | | Date | Fri, 06 Dec 2013 22:14:00 -0500 | From | Rik van Riel <> | Subject | Re: [PATCH 14/15] mm: fix TLB flush race between migration, and change_protection_range |
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On 12/06/2013 07:25 PM, Christoph Lameter wrote: > On Fri, 6 Dec 2013, Rik van Riel wrote: > >>> When you start migrating a page a special page migration entry is >>> created that will trap all accesses to the page. You can safely flush when >>> the migration entry is there. Only allow a new PTE/PMD to be put there >>> *after* the tlb flush. >> >> A PROT_NONE or NUMA pte is just as effective as a migration pte. >> The only problem is, the TLB flush was not always done... > > Ok then what are you trying to fix?
It would help if you had actually read the patch.
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