Messages in this thread | | | Date | Thu, 11 Jul 2013 13:21:02 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 04/16] mm: numa: Do not migrate or account for hinting faults on the zero page |
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On Thu, Jul 11, 2013 at 10:46:48AM +0100, Mel Gorman wrote: > +++ b/mm/memory.c > @@ -3560,8 +3560,13 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, > set_pte_at(mm, addr, ptep, pte); > update_mmu_cache(vma, addr, ptep); > > + /* > + * Do not account for faults against the huge zero page. The read-only
s/huge //
> + * data is likely to be read-cached on the local CPUs and it is less > + * useful to know about local versus remote hits on the zero page. > + */ > page = vm_normal_page(vma, addr, pte); > - if (!page) { > + if (!page || is_zero_pfn(page_to_pfn(page))) { > pte_unmap_unlock(ptep, ptl); > return 0; > } > -- > 1.8.1.4 >
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