linux-kernel - Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory)

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Date:	Fri, 08 Sep 2006 11:26:34 +0400
From:	Pavel Emelianov <xemul@...nvz.org>
To:	sekharan@...ibm.com
CC:	Kirill Korotaev <dev@...ru>, Dave Hansen <haveblue@...ibm.com>,
	Rik van Riel <riel@...hat.com>,
	CKRM-Tech <ckrm-tech@...ts.sourceforge.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	Hugh Dickins <hugh@...itas.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Alexey Dobriyan <adobriyan@...l.ru>,
	Oleg Nesterov <oleg@...sign.ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user
 memory)

Chandra Seetharaman wrote:
> On Thu, 2006-09-07 at 11:29 +0400, Pavel Emelianov wrote:
> <snip>
>
>   
>>>> BUT: I remind you the talks at OKS/OLS and in previous UBC discussions.
>>>> It was noted that having a separate interfaces for CPU, I/O bandwidth
>>>>     
>>>>         
>>> But, it will be lot simpler for the user to configure/use if they are
>>> together. We should discuss this also.
>>>   
>>>       
>> IMHO such unification may only imply that one syscall is used to pass
>> configuration info into kernel.
>> Each controller has specific configurating parameters different from the
>> other ones. E.g. CPU controller must assign a "weight" to each group to
>> share CPU time accordingly, but what is a "weight" for memory controller?
>> IO may operate on "bandwidth" and it's not clear what is a "bandwidth" in
>> Kb/sec for CPU controller and so on.
>>     
>
> CKRM/RG handles this by eliminating the units from the interface and
> abstracting them to be "shares". Each resource controller converts the
> shares to its own units and handles properly. 
>   
That's what I'm talking about - common syscall/ioct/etc and each controller
parses its input itself. That's OK for us.

[snip]
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