The patch titled
Subject: mm/THP: withdraw the pgtable after pmdp related operations
has been added to the -mm tree. Its filename is
mm-thp-withdraw-the-pgtable-after-pmdp-related-operations.patch
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From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Subject: mm/THP: withdraw the pgtable after pmdp related operations
For architectures like ppc64 we look at deposited pgtable when calling
pmdp_get_and_clear. So do the pgtable_trans_huge_withdraw after finishing
pmdp related operations.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff -puN mm/huge_memory.c~mm-thp-withdraw-the-pgtable-after-pmdp-related-operations mm/huge_memory.c
--- a/mm/huge_memory.c~mm-thp-withdraw-the-pgtable-after-pmdp-related-operations
+++ a/mm/huge_memory.c
@@ -1360,9 +1360,15 @@ int zap_huge_pmd(struct mmu_gather *tlb,
struct page *page;
pgtable_t pgtable;
pmd_t orig_pmd;
- pgtable = pgtable_trans_huge_withdraw(tlb->mm, pmd);
+ /*
+ * For architectures like ppc64 we look at deposited pgtable
+ * when calling pmdp_get_and_clear. So do the
+ * pgtable_trans_huge_withdraw after finishing pmdp related
+ * operations.
+ */
orig_pmd = pmdp_get_and_clear(tlb->mm, addr, pmd);
tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
+ pgtable = pgtable_trans_huge_withdraw(tlb->mm, pmd);
if (is_huge_zero_pmd(orig_pmd)) {
tlb->mm->nr_ptes--;
spin_unlock(&tlb->mm->page_table_lock);
_
Patches currently in -mm which might be from aneesh.kumar@xxxxxxxxxxxxxxxxxx are
mm-thp-use-pmd_populate-to-update-the-pmd-with-pgtable_t-pointer.patch
mm-thp-use-the-right-function-when-updating-access-flags.patch
mm-thp-add-pmd-args-to-pgtable-deposit-and-withdraw-apis.patch
mm-thp-withdraw-the-pgtable-after-pmdp-related-operations.patch
mm-thp-dont-use-hpage_shift-in-transparent-hugepage-code.patch
mm-thp-deposit-the-transpare-huge-pgtable-before-set_pmd.patch
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