Messages in this thread | | | Date | Wed, 09 Feb 2011 19:06:15 -0800 | From | Arjan van de Ven <> | Subject | Re: [PATCH 1/1, v6] cgroup/freezer: add per freezer duty ratio control |
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On 2/9/2011 7:04 PM, Matt Helsley wrote: > On Tue, Feb 08, 2011 at 05:05:41PM -0800, jacob.jun.pan@linux.intel.com wrote: >> From: Jacob Pan<jacob.jun.pan@linux.intel.com> >> >> 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)
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