[Devel] Re: [Question] power management related with cgroup based resource management

[MinChan Kim]

Hi, Dong-Jae.


> In some aspect, your opinion is right.
> Existing controller(ex. disk IO controllers) can be run on new HW
> devices(ex. SSD), existing block layer and so on.
>
> but, what I mean is that such controllers can support more performance
> if the controllers are rewrited with reconsideration of the features
> of new HW devices. in other words, what I mean can be optimization of
> controllers for new devices
> For example,
> In case of SSD, current IO scheduler layer is needed ? although i can
> not sure about it ^^
> or process sleep is needed after throwing the IO requests to storage ?
> the role of page cache in SSD or NVRAM is less important than in
> normal HDD and ....

What you mention is already included in 2.6.28 merge window.
I think we can use this feature on NVRAM, too.

http://lwn.net/Articles/303270/


> I heard that many research centers in comanies and universities have
> studied about smiliar research
> of course, it can be OS itself, device drivers, block layer, file
> systems and memory management
>
> Under this trend,
> I just wonder whether the trend can be reflected to cgroup  based
> controllers or not.
> and whether it is meaningful or not?
> How do you think about this?
> My opinion may be some humble ^^

I think it's not cgroup controller's role but each subsystem's one.
As you can see above article, Many mainline guys try to improve
performance in each subsystems.

Do you have a scenario or idea how to use cgroup frame work to manage
devices like NVRAM, SSD ??

> Thank you
> --
> Best Regards,
> Dong-Jae Kang
> --
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-- 
Kinds regards,
MinChan Kim
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