From: "prakash.sangappa" <prakash.sangappa@oracle.com>
To: Christopher Lameter <cl@linux.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-api@vger.kernel.org, akpm@linux-foundation.org,
mhocko@suse.com, kirill.shutemov@linux.intel.com,
n-horiguchi@ah.jp.nec.com, drepper@gmail.com,
rientjes@google.com
Subject: Re: [RFC PATCH] Add /proc/<pid>/numa_vamaps for numa node information
Date: Thu, 3 May 2018 15:39:49 -0700 [thread overview]
Message-ID: <c80ee329-084b-367f-1937-3175c178e978@oracle.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1805031259210.7831@nuc-kabylake>
On 05/03/2018 11:03 AM, Christopher Lameter wrote:
> On Tue, 1 May 2018, Prakash Sangappa wrote:
>
>> For analysis purpose it is useful to have numa node information
>> corresponding mapped address ranges of the process. Currently
>> /proc/<pid>/numa_maps provides list of numa nodes from where pages are
>> allocated per VMA of the process. This is not useful if an user needs to
>> determine which numa node the mapped pages are allocated from for a
>> particular address range. It would have helped if the numa node information
>> presented in /proc/<pid>/numa_maps was broken down by VA ranges showing the
>> exact numa node from where the pages have been allocated.
> Cant you write a small script that scans the information in numa_maps and
> then displays the total pages per NUMA node and then a list of which
> ranges have how many pages on a particular node?
Don't think we can determine which numa node a given user process
address range has pages from, based on the existing 'numa_maps' file.
>> reading this file will not be restricted(i.e requiring CAP_SYS_ADMIN).
> So a prime motivator here is security restricted access to numa_maps?
No it is the opposite. A regular user should be able to determine
numa node information.
next prev parent reply other threads:[~2018-05-03 22:39 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-02 5:58 [RFC PATCH] Add /proc/<pid>/numa_vamaps for numa node information Prakash Sangappa
2018-05-02 21:33 ` Andrew Morton
2018-05-02 22:28 ` Dave Hansen
2018-05-02 23:17 ` prakash.sangappa
2018-05-03 8:46 ` Anshuman Khandual
2018-05-03 22:27 ` prakash.sangappa
2018-05-03 22:26 ` Dave Hansen
2018-05-07 23:22 ` prakash.sangappa
2018-05-08 0:05 ` Dave Hansen
2018-05-08 1:16 ` prakash.sangappa
2018-05-09 23:31 ` Dave Hansen
2018-09-12 20:42 ` prakash.sangappa
2018-09-12 20:57 ` prakash.sangappa
2018-09-14 1:33 ` Jann Horn
2018-09-14 6:21 ` Michal Hocko
2018-09-14 12:49 ` Jann Horn
2018-09-14 13:49 ` Michal Hocko
2018-09-14 18:07 ` Prakash Sangappa
2018-09-14 18:14 ` Jann Horn
2018-05-02 23:43 ` prakash.sangappa
2018-05-03 8:57 ` Michal Hocko
2018-05-03 22:37 ` prakash.sangappa
2018-05-04 11:10 ` Michal Hocko
2018-05-03 18:03 ` Christopher Lameter
2018-05-03 22:39 ` prakash.sangappa [this message]
2018-05-04 11:12 ` Michal Hocko
2018-05-04 16:18 ` Prakash Sangappa
2018-05-10 7:42 ` Michal Hocko
2018-05-10 16:00 ` Prakash Sangappa
2018-05-11 6:39 ` Michal Hocko
2018-05-04 14:57 ` Christopher Lameter
2018-05-04 16:27 ` Prakash Sangappa
2018-05-07 14:47 ` Christopher Lameter
2018-05-07 22:50 ` prakash.sangappa
2018-05-08 12:53 ` Christopher Lameter
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