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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-12-12 16:42:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 18:55:07 -0800
commit07e326610e5634e5038fce32fff370949eb42101 (patch)
treee5e1e1a421de8302a9de8865663ce1e8923035b0 /mm/hugetlb.c
parentb528e4b6405b9fd656a6a308a7e2aa6afa50e77d (diff)
downloadop-kernel-dev-07e326610e5634e5038fce32fff370949eb42101.zip
op-kernel-dev-07e326610e5634e5038fce32fff370949eb42101.tar.gz
mm: add tlb_remove_check_page_size_change to track page size change
With commit e77b0852b551 ("mm/mmu_gather: track page size with mmu gather and force flush if page size change") we added the ability to force a tlb flush when the page size change in a mmu_gather loop. We did that by checking for a page size change every time we added a page to mmu_gather for lazy flush/remove. We can improve that by moving the page size change check early and not doing it every time we add a page. This also helps us to do tlb flush when invalidating a range covering dax mapping. Wrt dax mapping we don't have a backing struct page and hence we don't call tlb_remove_page, which earlier forced the tlb flush on page size change. Moving the page size change check earlier means we will do the same even for dax mapping. We also avoid doing this check on architecture other than powerpc. In a later patch we will remove page size check from tlb_remove_page(). Link: http://lkml.kernel.org/r/20161026084839.27299-5-aneesh.kumar@linux.vnet.ibm.com Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 8e519da..3edb759 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3286,6 +3286,11 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
BUG_ON(start & ~huge_page_mask(h));
BUG_ON(end & ~huge_page_mask(h));
+ /*
+ * This is a hugetlb vma, all the pte entries should point
+ * to huge page.
+ */
+ tlb_remove_check_page_size_change(tlb, sz);
tlb_start_vma(tlb, vma);
mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
address = start;
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