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

From	Waiman Long <longman@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics
Date	2017-06-01 23:20 +0200
Message-ID	<tNFFE-84v-17@gated-at.bofh.it> (permalink)
References	(6 earlier) <tNDku-6hn-29@gated-at.bofh.it> <tNDXb-6PE-13@gated-at.bofh.it> <tNF2V-7C0-17@gated-at.bofh.it> <tNFcB-7FC-13@gated-at.bofh.it> <tNFmj-7IJ-21@gated-at.bofh.it>
Organization	Red Hat

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On 06/01/2017 04:52 PM, Tejun Heo wrote:
> 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.
>
Are you referring to keeping the no internal process restriction and
document how to work around that instead? I would like to hear what
workarounds are currently being used.

Anyway, you currently allow internal process in thread mode, but not in
non-thread mode. I would prefer no such restriction in both thread and
non-thread mode.

Cheers,
Longman

Thread

Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 17:00 +0200
  Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Peter Zijlstra <peterz@infradead.org> - 2017-06-01 17:20 +0200
    Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 17:40 +0200
    Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 20:50 +0200
      Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 20:50 +0200
        Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 21:30 +0200
          Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 22:40 +0200
            Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 22:50 +0200
              Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 23:00 +0200
                Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-01 23:20 +0200
                Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-02 22:40 +0200
                Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Tejun Heo <tj@kernel.org> - 2017-06-03 12:40 +0200
                Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 23:20 +0200
      Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 22:00 +0200
    Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 22:20 +0200
  Re: [RFC PATCH v2 11/17] cgroup: Implement new thread mode semantics Waiman Long <longman@redhat.com> - 2017-06-01 20:50 +0200

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