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    SubjectRe: [RFC/RFT PATCH v3] sched: automated per tty task groups
    On Tue, Nov 16, 2010 at 11:45 AM, Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    >
    > In a system daemon? Good luck with that. It's a nightmare. Maybe you
    > could just poll all the cgroups, and try to remove them once a minute,
    > and if they are empty it works. Or something like that. But what a
    > hacky thing it would be.

    There's an existing cgroups API - release_agent and notify_on_release
    - whereby the kernel will spawn a userspace command once a given
    cgroup is completely empty. It's intended for pretty much exactly this
    purpose.

    Paul


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