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

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Message-ID: <20150821163858.GB4600@Sligo.logfs.org>
Date:	Fri, 21 Aug 2015 09:38:58 -0700
From:	Jörn Engel <joern@...estorage.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to
 /proc/PID/status

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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