Re: [PATCH 1/1, v6] cgroup/freezer: add per freezer duty ratio control

[Arjan van de Ven]

On 2/9/2011 7:04 PM, Matt Helsley wrote:
> On Tue, Feb 08, 2011 at 05:05:41PM -0800, jacob.jun.pan@xxxxxxxxxxxxxxx wrote:
> > From: Jacob Pan<jacob.jun.pan@xxxxxxxxxxxxxxx>
> >
> > 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
> >
> > Usage example: set period to be 5 seconds and frozen duty ratio 90%
> > [root@localhost aoa]# echo 90>  freezer.duty_ratio_pct
> > [root@localhost aoa]# echo 5000>  freezer.period_ms
> I kept wondering how this was useful when we've got the "cpu" subsystem
> because for some reason "duty cycle" made me think this was a scheduling
> policy knob. In fact, I'm pretty sure it is -- it just happens to
> sometimes reduce power consumption.
>
> Have you tried using the cpu cgroup subsystem's share to see if it can
> have a similar effect?

does the cpu cgroup system work on a 20 to 30 second time window?
the objective is to have the CPU idle, without wakeups, for that long...
(to save power)


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/