linux-kernel - Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics

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Message-ID: <20170524212745.GP24798@htj.duckdns.org>
Date:   Wed, 24 May 2017 17:27:45 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, kernel-team@...com, pjt@...gle.com,
        luto@...capital.net, efault@....de
Subject: Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics

Hello,

On Wed, May 24, 2017 at 05:17:13PM -0400, Waiman Long wrote:
> An alternative is to have separate enabling for thread root. For example,
> 
> # echo root > cgroup.threads
> # echo enable > child/cgroup.threads
> 
> The first statement make the current cgroup the thread root. However,
> setting it to a thread root doesn't make its child to be threaded. This
> have to be explicitly done on each of the children. Once a child cgroup
> is made to be threaded, all its descendants will be threaded. That will
> have the same effect as the current patch.

Yeah, I'm toying with different ideas.  I'll get back to you once
things get more concrete.

> With delegation, do you mean the relationship between a container and
> its host?

It can be but doesn't have to be.  For example, it can be delegations
to users without namespace / container being involved.

Thanks.

-- 
tejun