Messages in this thread Patch in this message | | | Subject | [PATCH] mm: disable numa migration faults for dax vmas | From | Dan Williams <> | Date | Fri, 11 Nov 2016 20:21:41 -0800 |
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Mark dax vmas as not migratable to exclude them from task_numa_work(). This is especially relevant for device-dax which wants to ensure predictable access latency and not incur periodic faults.
Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- include/linux/mempolicy.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h index 5e5b2969d931..d72c691afaa6 100644 --- a/include/linux/mempolicy.h +++ b/include/linux/mempolicy.h @@ -7,6 +7,7 @@ #include <linux/mmzone.h> +#include <linux/dax.h> #include <linux/slab.h> #include <linux/rbtree.h> #include <linux/spinlock.h> @@ -177,6 +178,9 @@ static inline bool vma_migratable(struct vm_area_struct *vma) if (vma->vm_flags & (VM_IO | VM_PFNMAP)) return false; + if (vma_is_dax(vma)) + return false; + #ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION if (vma->vm_flags & VM_HUGETLB) return false;
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