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

[Waiman Long]

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