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    SubjectRe: [PATCH 1/1, v7] cgroup/freezer: add per freezer duty ratio control
    On 2/13/2011 4:44 PM, KAMEZAWA Hiroyuki wrote:
    > On Sat, 12 Feb 2011 15:29:07 -0800
    > Matt Helsley<> wrote:
    >> On Fri, Feb 11, 2011 at 11:10:44AM -0800, wrote:
    >>> From: Jacob Pan<>
    >>> Freezer subsystem is used to manage batch jobs which can start
    >>> stop at the same time. However, sometime it is desirable to let
    >>> the kernel manage the freezer state automatically with a given
    >>> duty ratio.
    >>> For example, if we want to reduce the time that backgroup apps
    >>> are allowed to run we can put them into a freezer subsystem and
    >>> set the kernel to turn them THAWED/FROZEN at given duty ratio.
    >>> This patch introduces two file nodes under cgroup
    >>> freezer.duty_ratio_pct and freezer.period_sec
    >> Again: I don't think this is the right approach in the long term.
    >> It would be better not to add this interface and instead enable the
    >> cpu cgroup subsystem for non-rt tasks using a similar duty ratio
    >> concept..
    >> Nevertheless, I've added some feedback on the code for you here :).
    > AFAIK, there was a work for bandwidth control in CFS.
    > I tested this and worked fine. This schduler approach seems better for
    > my purpose to limit bandwidth of apprications rather than freezer.

    for our purpose, it's not about bandwidth.
    it's about making sure the class of apps don't run for a long period
    (30-second range) of time.

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