Messages in this thread | | | Date | Tue, 8 Apr 2014 19:30:31 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH 0/5] Use an alternative to _PAGE_PROTNONE for _PAGE_NUMA v2 |
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On Tue, Apr 08, 2014 at 05:46:52PM +0100, Mel Gorman wrote: > Someone will ask why automatic NUMA balancing hints do not use "real" > PROT_NONE but as it would need VMA information to do that on all > architectures it would mean that VMA-fixups would be required when marking > PTEs for NUMA hinting faults so would be expensive.
Like this:
https://lkml.org/lkml/2012/11/13/431
That used the generic PROT_NONE infrastructure and compared, on fault, the page protection bits against the vma->vm_page_prot bits?
So the objection to that approach was the vma-> dereference in pte_numa() ?
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