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

Jörn Engel
2015-08-21T16:39:04Z

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