linux-kernel - Re: RFC: documentation of the autogroup feature

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Date:   Mon, 28 Nov 2016 02:46:14 +0100
From:   Mike Galbraith <efault@....de>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        linux-man <linux-man@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFC: documentation of the autogroup feature

On Sun, 2016-11-27 at 22:13 +0100, Michael Kerrisk (man-pages) wrote:

> Here's my attempt to define the root task group:
> 
>        *  If autogrouping is disabled, then all processes in the root CPU
>           cgroup form a scheduling group (sometimes called the "root task
>           group").
> 
> Can you improve on this?

A task group is a set of percpu runqueues.  The root task group is the
top level set in a hierarchy of such sets when group scheduling is
enabled, or the only set when group scheduling is not enabled.  The
autogroup hierarchy has a depth of one, ie all autogroups are peers
who's common parent is the root task group.

	-Mike