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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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