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:

quoted

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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