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mm: disable numa migration faults for dax vmas

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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.

[akpm@linux-foundation.org: add comment]
Link: http://lkml.kernel.org/r/147892450132.22062.16875659431109209179.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Williams 2016-12-12 16:43:12 -08:00 committed by Linus Torvalds
parent c7142aead8
commit c1ef8e2c02
1 changed files with 8 additions and 0 deletions
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8
include/linux/mempolicy.h
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@ -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 +178,13 @@ static inline bool vma_migratable(struct vm_area_struct *vma)
if (vma->vm_flags & (VM_IO | VM_PFNMAP))
return false;
/*
* DAX device mappings require predictable access latency, so avoid
* incurring periodic faults.
*/
if (vma_is_dax(vma))
return false;
#ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
if (vma->vm_flags & VM_HUGETLB)
return false;