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Message-ID: <1466075861-22943-1-git-send-email-zhongjiang@huawei.com>
Date: Thu, 16 Jun 2016 19:17:41 +0800
From: zhongjiang <zhongjiang@...wei.com>
To: <kirill.shutemov@...ux.intel.com>, <akpm@...ux-foundation.org>
CC: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm: fix account pmd page to the process
From: zhong jiang <zhongjiang@...wei.com>
when 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@...wei.com>
---
mm/hugetlb.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 19d0d08..3b025c5 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4189,10 +4189,9 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
if (pud_none(*pud)) {
pud_populate(mm, pud,
(pmd_t *)((unsigned long)spte & PAGE_MASK));
- } else {
+ } else
put_page(virt_to_page(spte));
- mm_inc_nr_pmds(mm);
- }
+
spin_unlock(ptl);
out:
pte = (pte_t *)pmd_alloc(mm, pud, addr);
--
1.8.3.1
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