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

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Message-ID: <20170601205203.GB13390@htj.duckdns.org>
Date:   Thu, 1 Jun 2017 16:52:03 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.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 Thu, Jun 01, 2017 at 04:48:48PM -0400, Waiman Long wrote:
> I think we are on agreement here. I should we should just document how
> userland can work around the internal process competition issue by
> setting up the cgroup hierarchy properly. Then we can remove the no
> internal process constraint.

Heh, we agree on the immediate solution but not the final direction.
This requirement affects how controllers implement resource control in
significant ways.  It is a restriction which can be worked around in
userland relatively easily.  I'd much prefer to keep the invariant
intact.

Thanks.

-- 
tejun