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| author | Liang Chen <liangchen.linux@gmail.com> | 2016-01-15 16:57:28 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-15 17:56:32 -0800 |
| commit | d645fc0eabbe783d34a14fbb31768ad8571f0ad4 (patch) | |
| tree | f85a130c9cde66b724ee6774b23fb5c782a85572 /mm/mempolicy.c | |
| parent | f16f091b5916857de2aa36724a15d4bd5e16e9d8 (diff) | |
| download | lwn-d645fc0eabbe783d34a14fbb31768ad8571f0ad4.tar.gz lwn-d645fc0eabbe783d34a14fbb31768ad8571f0ad4.zip | |
mm: mempolicy: skip non-migratable VMAs when setting MPOL_MF_LAZY
MPOL_MF_LAZY is not visible from userspace since a720094ded8c ("mm:
mempolicy: Hide MPOL_NOOP and MPOL_MF_LAZY from userspace for now"), but
it should still skip non-migratable VMAs such as VM_IO, VM_PFNMAP, and
VM_HUGETLB VMAs, and avoid useless overhead of minor faults.
Signed-off-by: Liang Chen <liangchen.linux@gmail.com>
Signed-off-by: Gavin Guo <gavin.guo@canonical.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 973434eff9dc..27d135408a22 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -644,7 +644,8 @@ static int queue_pages_test_walk(unsigned long start, unsigned long end, if (flags & MPOL_MF_LAZY) { /* Similar to task_numa_work, skip inaccessible VMAs */ - if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) + if (vma_migratable(vma) && + vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) change_prot_numa(vma, start, endvma); return 1; } |