The patch titled
Subject: mm/mempolicy: skip walking HUGETLB vma if MPOL_MF_STRICT is specified alone
has been added to the -mm tree. Its filename is
mm-mempolicy-skip-walking-hugetlb-vma-if-mpol_mf_strict-is-specified-alone.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mempolicy-skip-walking-hugetlb-vma-if-mpol_mf_strict-is-specified-alone.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mempolicy-skip-walking-hugetlb-vma-if-mpol_mf_strict-is-specified-alone.patch
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------------------------------------------------------
From: Li Xinhai <lixinhai.lxh@xxxxxxxxx>
Subject: mm/mempolicy: skip walking HUGETLB vma if MPOL_MF_STRICT is specified alone
Checking MPOL_MF_STRICT is ignored for HUGETLB vma according to mbind man
page:
Notes
MPOL_MF_STRICT is ignored on huge page mappings.
If MPOL_MF_STRICT is specified alone without any MOVE flag, we should
indicate, from test_walk, that walking this vma should be skipped even if
there are misplaced pages.
Link: http://lkml.kernel.org/r/1578993378-10860-2-git-send-email-lixinhai.lxh@xxxxxxxxx
Signed-off-by: Li Xinhai <lixinhai.lxh@xxxxxxxxx>
Reviewed-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/mm/mempolicy.c~mm-mempolicy-skip-walking-hugetlb-vma-if-mpol_mf_strict-is-specified-alone
+++ a/mm/mempolicy.c
@@ -656,6 +656,13 @@ static int queue_pages_test_walk(unsigne
return 1;
}
+ /* MPOL_MF_STRICT is ignored for huge page, skip checking
+ * misplaced pages
+ */
+ if ((flags & MPOL_MF_VALID) == MPOL_MF_STRICT &&
+ is_vm_hugetlb_page(vma))
+ return 1;
+
/* queue pages from current vma */
if (flags & MPOL_MF_VALID)
return 0;
_
Patches currently in -mm which might be from lixinhai.lxh@xxxxxxxxx are
mm-page_vma_mappedc-explicitly-compare-pfn-for-normal-hugetlbfs-and-thp-page.patch
mm-mempolicy-checking-hstate-for-hugetlbfs-page-in-vma_migratable.patch
mm-mempolicy-skip-walking-hugetlb-vma-if-mpol_mf_strict-is-specified-alone.patch
