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    SubjectRe: [PATCH, v10 3/3] cgroups: introduce timer slack controller
    On Tue, 11 Oct 2011 19:15:29 +0300
    "Kirill A. Shutemov" <kirill@shutemov.name> wrote:

    > Every task_struct has timer_slack_ns value. This value uses to round up
    > poll() and select() timeout values. This feature can be useful in
    > mobile environment where combined wakeups are desired.
    >
    > Originally, prctl() was the only way to change timer slack value of
    > a process. So you was not able change timer slack value of another
    > process.
    >
    > cgroup subsys "timer_slack" implements timer slack controller. It
    > provides a way to set minimal timer slack value for a group of tasks.
    > If a task belongs to a cgroup with minimal timer slack value higher than
    > task's value, cgroup's value will be applied.
    >
    > Timer slack controller allows to implement setting timer slack value of
    > a process based on a policy. For example, you can create foreground and
    > background cgroups and move tasks between them based on system state.

    I'm having trouble understanding the value of this feature. Users can
    presently control the timer-slack of a group of processes via
    inherit-over-fork.

    Perhaps there's a case for providing a way for process A to set process
    B's slack. And perhaps B's children. That would be a simpler patch
    and would have the considerable advantage that it doesn't require
    cgroups.

    So.... why should we merge this?

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