linux-kernel - Re: [RFC PATCH] Add /proc/<pid>/numa

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Date:   Thu, 3 May 2018 13:03:51 -0500 (CDT)
From:   Christopher Lameter <cl@...ux.com>
To:     Prakash Sangappa <prakash.sangappa@...cle.com>
cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-api@...r.kernel.org, akpm@...ux-foundation.org,
        mhocko@...e.com, kirill.shutemov@...ux.intel.com,
        n-horiguchi@...jp.nec.com, drepper@...il.com, rientjes@...gle.com
Subject: Re: [RFC PATCH] Add /proc/<pid>/numa_vamaps for numa node
 information

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?

> 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?