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cgroups.7: Add a detail on delegation of cgroup.threads 

Some notes from a conversation with Tejun Heo:

    Subject: Re: cgroups(7): documenting cgroups v2 delegation
    Date: Wed, 10 Jan 2018 14:27:26 -0800
    From: Tejun Heo <tj@kernel.org>

    > > 1. When delegating, cgroup.threads should be delegated.  Doing that
    > >    selectively doesn't achieve anything meaningful.
    >
    > Understood. But surely delegating cgroup.threads is effectively
    > meaningless when delegating a "domain" cgroup tree? (Obviously it's
    > not harmful to delegate the the cgroup.threads file in this case;
    > it's just not useful to do so.)

    Yeap, unless we can somehow support non-root mixed domains.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2018-01-11 00:52:26 +01:00
parent 6dc513cd38
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@ -915,6 +915,12 @@ the delegater might instead add selected controllers to this file.)
Changing the ownership of this file is necessary if a threaded subtree
is being delegated (see the description of "thread mode", below).
This permits the delegatee to write thread IDs to the file.
(The ownership of this file can also be changed when delegating
a domain subtree, but currently this serves no purpose,
since, as described below, it is not possible to move a thread between
domain cgroups by writing its thread ID to the
.IR cgroup.tasks
file.)
.PP
The delegater should
.I not