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    SubjectRe: [PATCH 1/1, v7] cgroup/freezer: add per freezer duty ratio control
    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.

    BTW, isn't period_sec too large ?


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