Re: [ckrm-tech] [RFC 3/5] sched: Add CPU rate hard caps

[Chandra Seetharaman <sekharan@us.ibm.com>]

On Fri, 2006-06-02 at 09:26 +1000, Peter Williams wrote:
> Chandra Seetharaman wrote:
> > On Thu, 2006-06-01 at 14:04 +0530, Balbir Singh wrote:
> >> Hi, Kirill,
> >>
> >> Kirill Korotaev wrote:
> >>>> Do you have any documented requirements for container resource 
> >>>> management?
> >>>> Is there a minimum list of features and nice to have features for 
> >>>> containers
> >>>> as far as resource management is concerned?
> >>> Sure! You can check OpenVZ project (http://openvz.org) for example of 
> >>> required resource management. BTW, I must agree with other people here 
> >>> who noticed that per-process resource management is really useless and 
> >>> hard to use :(
> > 
> > I totally agree.
> >> I'll take a look at the references. I agree with you that it will be useful
> >> to have resource management for a group of tasks.
> 
> But you don't need something as complex as CKRM either.  This capping

All CKRM^W Resource Groups does is to group unrelated/related tasks to a
group and apply resource limits. 

>  
> functionality coupled with (the lamented) PAGG patches (should have been 
> called TAGG for "task aggregation" instead of PAGG for "process 
> aggregation") would allow you to implement a kernel module that could 
> apply caps to arbitrary groups of tasks.

I do not follow how PAGG + this cap feature can be used to put cap of
related/unrelated tasks. Can you provide little more explanation,
please.

Also, i do not think it can provide guarantees to that group of tasks.
can it ?

> 
> Peter
-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@us.ibm.com   |      .......you may get it.
----------------------------------------------------------------------


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