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mm: Move change_prot_numa outside CONFIG_ARCH_USES_NUMA_PROT_NONE
change_prot_numa should work even if _PAGE_NUMA != _PAGE_PROTNONE. On archs like ppc64 that don't use _PAGE_PROTNONE and also have a separate page table outside linux pagetable, we just need to make sure that when calling change_prot_numa we flush the hardware page table entry so that next page access result in a numa fault. We still need to make sure we use the numa faulting logic only when CONFIG_NUMA_BALANCING is set. This implies the migrate-on-fault (Lazy migration) via mbind will only work if CONFIG_NUMA_BALANCING is set. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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2c49195b6a
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2 changed files with 3 additions and 4 deletions
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@ -1842,7 +1842,7 @@ static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
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}
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#endif
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#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
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#ifdef CONFIG_NUMA_BALANCING
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unsigned long change_prot_numa(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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#endif
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@ -613,7 +613,7 @@ static inline int queue_pages_pgd_range(struct vm_area_struct *vma,
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return 0;
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}
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#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
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#ifdef CONFIG_NUMA_BALANCING
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/*
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* This is used to mark a range of virtual addresses to be inaccessible.
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* These are later cleared by a NUMA hinting fault. Depending on these
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@ -627,7 +627,6 @@ unsigned long change_prot_numa(struct vm_area_struct *vma,
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unsigned long addr, unsigned long end)
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{
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int nr_updated;
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BUILD_BUG_ON(_PAGE_NUMA != _PAGE_PROTNONE);
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nr_updated = change_protection(vma, addr, end, vma->vm_page_prot, 0, 1);
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if (nr_updated)
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@ -641,7 +640,7 @@ static unsigned long change_prot_numa(struct vm_area_struct *vma,
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{
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return 0;
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}
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#endif /* CONFIG_ARCH_USES_NUMA_PROT_NONE */
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#endif /* CONFIG_NUMA_BALANCING */
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/*
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* Walk through page tables and collect pages to be migrated.
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