[PATCH 1/1, v6] cgroup/freezer: add per freezer duty ratio control
lizf at cn.fujitsu.com
Wed Feb 9 17:26:08 PST 2011
jacob pan wrote:
> On Wed, 09 Feb 2011 11:07:59 +0800
> Li Zefan <lizf at cn.fujitsu.com> wrote:
>> jacob.jun.pan at linux.intel.com wrote:
>>> From: Jacob Pan <jacob.jun.pan at 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 at localhost aoa]# echo 90 > freezer.duty_ratio_pct
>>> [root at localhost aoa]# echo 5000 > freezer.period_ms
>> So after:
>> # echo FROZEN > freezer.state
>> # echo 90 > freezer.duty_ratio_pct
>> # echo 5000 > freezer.period_ms
>> # echo 0 > freezer.duty_ratio_pct
>> All the tasks in this cgroup are in THAWED state, but the cgroup is
>> in FROZEN state. This should be fixed.
> I don't know how could this ever happen. Is it based on your testing?
> Whenever tasks in a cgroup are thawed/frozen, its freezer state would
> change accordingly.
> After your example, freezer.state should have THAWED. It matches
> user's intention, i.e. if a user do
> echo 0 > freezer.duty_ratio_pct
> It must want 0% to be frozen, which is THAWED.
> Am I missing anything?
You're right. I made a mistake when looking into the patch.
btw, I made a few other comments in your code, that you may have
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