Messages in this thread |  | | | Date | Wed, 30 Aug 2006 18:13:16 +0200 | | From | Martin Ohlin <> | | Subject | Re: A nice CPU resource controller |
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Balbir Singh wrote:
> The CKRM e-series is a PID based CPU Controller. It did a good job of > controlling and smoothing out the load (and variations) and even > worked with groups. But it achieved all this through some amount of > complexity. How do you plan to extend the idea to groups? Do you have > any code that we can look at?
I would say that my controller so far is very simple, probably too simple. I have no detailed plan yet about how to incorporate groups of tasks, only small ideas that I would like to think a little more on before I say something embarrasing. The important code-parts are in the thesis, and I must say that the code is in no way finished, but most of it can be found at: http://www.control.lth.se/user/martin.ohlin/linux/sampler.c
> I do not understand controlling the nice value? Most cpu control the > bandwidth/time - are there any advantages to controlling the nice > value? How does this interplay with dynamic priorities that the > scheduler currently maintains?
There is a relationship between the nice value and the achieved bandwidth/time. Therefore it was possible that the nice value could be used to control the bandwidth/time. I wanted to know if it was possible to use it, and it was. As to the dynamic priorities, I do not change them, but as I do change the nice value and the dynamic priorities are relative to that, then you may say that I do change them... Anyway, it seems to work.
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