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

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Message-ID: <20150820233450.GB10807@hori1.linux.bs1.fc.nec.co.jp>
Date:	Thu, 20 Aug 2015 23:34:51 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Michal Hocko <mhocko@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Jörn Engel <joern@...estorage.com>,
	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 Thu, Aug 20, 2015 at 01:00:05PM +0200, Michal Hocko wrote:
> On Thu 20-08-15 08:26:27, Naoya Horiguchi wrote:
> > Currently there's no easy way to get per-process usage of hugetlb pages,
> 
> Is this really the case after your previous patch? You have both 
> HugetlbPages and KernelPageSize which should be sufficient no?

We can calcurate it from these info, so saying "no easy way" was incorrect :(

> Reading a single file is, of course, easier but is it really worth the
> additional code? I haven't really looked at the patch so I might be
> missing something but what would be an advantage over reading
> /proc/<pid>/smaps and extracting the information from there?

My first idea was just "users should feel it useful", but permission as David
commented sounds a good technical reason to me.

Thanks,
Naoya Horiguchi