linux-kernel - Re: cgroups(7): documenting /sys/kernel/cgroup files

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Date:   Wed, 10 Jan 2018 05:23:32 +0100
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Roman Gushchin <guro@...com>
Cc:     Michael Kerrisk <mtk.manpages@...il.com>,
        "Serge E. Hallyn" <serge@...lyn.com>, Tejun Heo <tj@...nel.org>,
        linux-man <linux-man@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>
Subject: Re: cgroups(7): documenting /sys/kernel/cgroup files

Hello Roman,

On 8 January 2018 at 22:11, Michael Kerrisk (man-pages)
<mtk.manpages@...il.com> wrote:
> Hello Roman,
>
> I wrote cgroups(7) text below to document the files added by you in
> Linux 4.15. Could you let me know if the following text is okay please:
>
>    /sys/kernel/cgroup files
>        /sys/kernel/cgroup/delegate (since Linux 4.15)
>               This file exports a list of the cgroups v2 files  (one  per
>               line) that are delegatable (i.e., whose ownership should be
>               changed to the user ID of the delegatee).  In  the  future,
>               the  set  of delegatable files may change or grow, and this
>               file provides a way for the  kernel  to  inform  user-space
>               applications of which files must be delegated.  As at Linux
>               4.15, one sees the following when inspecting this file:
>
>                   $ cat /sys/kernel/cgroup/delegate
>                   cgroup.procs
>                   cgroup.subtree_control

I have a question about /sys/kernel/cgroup/delegate: why does this
file not list cgroup.threads, since that is also a file that
(potentially) should be delegated?

Cheers,

Michael