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Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status

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On Fri, Aug 21, 2015 at 08:32:33AM +0200, Michal Hocko wrote:
> 
> Both mmotm and linus tree have
>         REG("smaps",      S_IRUGO, proc_pid_smaps_operations),
> 
> and opening the file requires PTRACE_MODE_READ. So I do not see any
> requirement for root here. Or did you mean that you need root to examine
> all processes? That would be true but I am wondering why would be a regular
> user interested in this break out numbers. Hugetlb management sounds
> pretty much like an administrative or very specialized thing.
> 
> From my understanding of the discussion there is no usecase to have this
> information world readable. Is this correct?

Well, tools like top currently display rss.  Once we have some
interface, I would like a version of top that displays the true rss
including hugepages (hrss maybe?).

If we make such a tool impossible today, someone will complain about it
in the future and we created a new mess for ourselves.  I think it is
trouble enough to deal with the old one.

Jörn

--
Denying any reality for any laudable political goal is a bad strategy.
When the facts come out, the discovery of the facts will undermine the
laudable political goals.
-- Jared Diamond
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[PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2015-08-20 10:50 +0200
  Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Michal Hocko <mhocko@kernel.org> - 2015-08-20 13:10 +0200
    Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status David Rientjes <rientjes@google.com> - 2015-08-20 22:00 +0200
      Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Michal Hocko <mhocko@kernel.org> - 2015-08-21 08:40 +0200
        Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Jörn Engel <joern@purestorage.com> - 2015-08-21 18:40 +0200
    Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2015-08-21 01:40 +0200
      Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Michal Hocko <mhocko@kernel.org> - 2015-08-21 09:00 +0200
        Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Jörn Engel <joern@purestorage.com> - 2015-08-21 18:40 +0200
          Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Michal Hocko <mhocko@kernel.org> - 2015-08-24 11:00 +0200
            Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status David Rientjes <rientjes@google.com> - 2015-08-26 01:30 +0200
              Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Michal Hocko <mhocko@kernel.org> - 2015-08-26 08:40 +0200
                Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status David Rientjes <rientjes@google.com> - 2015-08-27 00:10 +0200
                Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Michal Hocko <mhocko@kernel.org> - 2015-08-27 08:50 +0200
                Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Jörn Engel <joern@purestorage.com> - 2015-08-27 19:30 +0200
                Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status David Rientjes <rientjes@google.com> - 2015-08-27 22:50 +0200
                Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to  /proc/PID/status Michal Hocko <mhocko@kernel.org> - 2015-08-31 11:20 +0200

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