Messages in this thread | | | Date | Mon, 27 Feb 2012 14:21:57 +0800 | From | Michael Wang <> | Subject | Re: [PATCH v5] sched: Avoid unnecessary work in reweight_entity |
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On 02/27/2012 01:10 PM, Srivatsa Vaddagiri wrote:
> * Michael Wang <wangyun@linux.vnet.ibm.com> [2012-02-27 13:07:28]: > >>> Is that benchmark run in root (cpu) cgroup? If so, reweight_entity() should not >>> kick in at all. >> >> >> That's right, if no children group, 'reweight_entity' won't be called, so I have >> created a cpuset group under root group named 'rg1', and created a memory group >> under 'rg1' named 'sub', I attached the current shell to the 'sub' cgroup. > > 'cpu' and 'cpuset' cgroup resource controllers are separate. By above > steps, you would still be running kern-bench in root cgroup as far as cpu > cgroup controller is concerned ..
I think I really need some study on cgroup first...I've done some totally useless test :( , but still confused that why sys time reduced?
And I got a server with Redhat now, so I will do:
1. cgcreate -g cpu:/subcg1 2. echo $$ > /cgroup/cpu/subcg1/tasks 3. open another shell 4. do 1~3 multi times, plan to get 7 cpu cgroup with 7 shell attached to each one. 5. run kernbench in each shell
Please tell me if I missed some thing :)
Regards, Michael Wang
> > - vatsa
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