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    SubjectRe: [PATCH v5 1/2] mm: hugetlb: proc: add HugetlbPages field to /proc/PID/smaps
    On Wed, 9 Sep 2015, Vlastimil Babka wrote:

    > On 08/20/2015 10:26 AM, Naoya Horiguchi wrote:
    > > Currently /proc/PID/smaps provides no usage info for vma(VM_HUGETLB), which
    > > is inconvenient when we want to know per-task or per-vma base hugetlb usage.
    > > To solve this, this patch adds a new line for hugetlb usage like below:
    > >
    > > Size: 20480 kB
    > > Rss: 0 kB
    > > Pss: 0 kB
    > > Shared_Clean: 0 kB
    > > Shared_Dirty: 0 kB
    > > Private_Clean: 0 kB
    > > Private_Dirty: 0 kB
    > > Referenced: 0 kB
    > > Anonymous: 0 kB
    > > AnonHugePages: 0 kB
    > > HugetlbPages: 18432 kB
    > > Swap: 0 kB
    > > KernelPageSize: 2048 kB
    > > MMUPageSize: 2048 kB
    > > Locked: 0 kB
    > > VmFlags: rd wr mr mw me de ht
    > >
    > > Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
    > > Acked-by: Joern Engel <joern@logfs.org>
    > > Acked-by: David Rientjes <rientjes@google.com>
    >
    > Sorry for coming late to this thread. It's a nice improvement, but I find it
    > somewhat illogical that the per-process stats (status) are more detailed than
    > the per-mapping stats (smaps) with respect to the size breakdown. I would
    > expect it to be the other way around. That would simplify the per-process
    > accounting (I realize this has been a hot topic already), and allow those who
    > really care to look at smaps.
    >

    Smaps shows the pagesize for the hugepage of the vma and the rss, I
    believe you have all the information needed. Some distributions also
    change smaps to only be readable by the owner or root for security
    reasons.


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