The patch titled
Subject: mm: mempolicy: skip non-migratable VMAs when setting MPOL_MF_LAZY
has been added to the -mm tree. Its filename is
mm-mempolicy-skip-non-migratable-vmas-when-setting-mpol_mf_lazy.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mempolicy-skip-non-migratable-vmas-when-setting-mpol_mf_lazy.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mempolicy-skip-non-migratable-vmas-when-setting-mpol_mf_lazy.patch
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------------------------------------------------------
From: Liang Chen <liangchen.linux@xxxxxxxxx>
Subject: 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@xxxxxxxxx>
Signed-off-by: Gavin Guo <gavin.guo@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN mm/mempolicy.c~mm-mempolicy-skip-non-migratable-vmas-when-setting-mpol_mf_lazy mm/mempolicy.c
--- a/mm/mempolicy.c~mm-mempolicy-skip-non-migratable-vmas-when-setting-mpol_mf_lazy
+++ a/mm/mempolicy.c
@@ -642,7 +642,8 @@ static int queue_pages_test_walk(unsigne
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;
}
_
Patches currently in -mm which might be from liangchen.linux@xxxxxxxxx are
mm-mempolicy-skip-non-migratable-vmas-when-setting-mpol_mf_lazy.patch
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