Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752756AbbHUQjE (ORCPT ); Fri, 21 Aug 2015 12:39:04 -0400 Received: from mail-pa0-f47.google.com ([209.85.220.47]:35094 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751819AbbHUQjB (ORCPT ); Fri, 21 Aug 2015 12:39:01 -0400 Date: Fri, 21 Aug 2015 09:38:58 -0700 From: =?iso-8859-1?Q?J=F6rn?= Engel To: Michal Hocko Cc: David Rientjes , Naoya Horiguchi , Andrew Morton , Mike Kravetz , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Naoya Horiguchi Subject: Re: [PATCH v5 2/2] mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status Message-ID: <20150821163858.GB4600@Sligo.logfs.org> References: <20150812000336.GB32192@hori1.linux.bs1.fc.nec.co.jp> <1440059182-19798-1-git-send-email-n-horiguchi@ah.jp.nec.com> <1440059182-19798-3-git-send-email-n-horiguchi@ah.jp.nec.com> <20150820110004.GB4632@dhcp22.suse.cz> <20150821063233.GB23723@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20150821063233.GB23723@dhcp22.suse.cz> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1440 Lines: 34 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. J?rn -- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/