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From: zhong jiang <zhongjiang@huawei.com>
To: aneesh.kumar@linux.vnet.ibm.com
Cc: Linux Memory Management List <linux-mm@kvack.org>
Subject: A question about the patch(commit :c777e2a8b654 powerpc/mm: Fix Multi hit ERAT cause by recent THP update)
Date: Wed, 22 Jun 2016 23:05:24 +0800	[thread overview]
Message-ID: <576AA934.4090504@huawei.com> (raw)

Hi  Aneesh

                CPU0                            CPU1
    shrink_page_list()
      add_to_swap()
        split_huge_page_to_list()
          __split_huge_pmd_locked()
            pmdp_huge_clear_flush_notify()
        // pmd_none() == true
                                        exit_mmap()
                                          unmap_vmas()
                                            zap_pmd_range()
                                              // no action on pmd since pmd_none() == true
        pmd_populate()


the mm should be the last user  when CPU1 process is exiting,  CPU0 must be a own mm .
two different process  should not be influenced each other.  in a words , they should not
have race.

I want to know if I missing the point.

Thanks
zhongjiang

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             reply	other threads:[~2016-06-22 15:05 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-22 15:05 zhong jiang [this message]
2016-06-23  9:29 ` Michal Hocko
2016-06-23  9:34   ` Michal Hocko
2016-06-28  2:35     ` zhong jiang

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