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Groups > linux.kernel > #1424976

[PATCH] mm: fix account pmd page to the process

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From: zhong jiang <zhongjiang@huawei.com>

hen a process acquire a pmd table shared by other process, we
increase the account to current process. otherwise, a race result
in other tasks have set the pud entry. so it no need to increase it.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 mm/hugetlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 19d0d08..3072857 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4191,7 +4191,7 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
 				(pmd_t *)((unsigned long)spte & PAGE_MASK));
 	} else {
 		put_page(virt_to_page(spte));
-		mm_inc_nr_pmds(mm);
+		mm_dec_nr_pmds(mm);
 	}
 	spin_unlock(ptl);
 out:
-- 
1.8.3.1

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[PATCH] mm: fix account pmd page to the process zhongjiang <zhongjiang@huawei.com> - 2016-06-17 14:00 +0200
  Re: [PATCH] mm: fix account pmd page to the process Michal Hocko <mhocko@kernel.org> - 2016-06-17 14:30 +0200
    Re: [PATCH] mm: fix account pmd page to the process zhong jiang <zhongjiang@huawei.com> - 2016-06-17 15:10 +0200

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