Messages in this thread Patch in this message | | | From | zhongjiang <> | Subject | [PATCH] mm: fix account pmd page to the process | Date | Thu, 16 Jun 2016 19:16:53 +0800 |
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From: zhong jiang <zhongjiang@huawei.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@huawei.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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