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SubjectRe: [RFC PATCH v2 12/17] cgroup: Remove cgroup v2 no internal process constraint
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On Fri, 2017-05-19 at 16:38 -0400, Tejun Heo wrote:
> Hello, Waiman.
>
> On Mon, May 15, 2017 at 09:34:11AM -0400, Waiman Long wrote:
> > The rationale behind the cgroup v2 no internal process constraint is
> > to avoid resouorce competition between internal processes and child
> > cgroups. However, not all controllers have problem with internal
> > process competiton. Enforcing this rule may lead to unnatural process
> > hierarchy and unneeded levels for those controllers.
>
> This isn't necessarily something we can determine by looking at the
> current state of controllers. It's true that some controllers - pid
> and perf - inherently only care about membership of each task but at
> the same time neither really suffers from the constraint either. CPU
> which is the problematic one here...

(+ cpuacct + cpuset)

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