Messages in this thread | | | Date | Thu, 16 Jun 2016 19:30:42 +0800 | From | zhong jiang <> | Subject | Re: [PATCH] mm: fix account pmd page to the process |
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On 2016/6/16 19:22, zhongjiang wrote: > 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);
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