[Devel] Re: [PATCH 2/2] CFS CGroup: Report usage

[Paul Menage]

On 10/23/07, Balbir Singh <balbir at linux.vnet.ibm.com> wrote:
>
> Well, without notify_on_release you can never be sure if a new task
> got added to the control group or if someone acquired a reference
> to it. I can't think of a safe way of removing control groups/cpusets
> without using notify_on_release.
>

Using notify_on_release doesn't make any guarantees that the
notification, or the action based on that notification, will occur
before the cgroup becomes busy again.

An rmdir() on a busy cgroup is perfectly safe, it just fails with
-EBUSY. I'd just like to avoid making active control file fds trigger
than failure mode.

Paul
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