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

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Date:	Fri, 08 Sep 2006 23:56:56 +0530
From:	Balbir Singh <balbir@...ibm.com>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	Pavel Emelianov <xemul@...nvz.org>, Rik van Riel <riel@...hat.com>,
	Srivatsa <vatsa@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	sekharan@...ibm.com, CKRM-Tech <ckrm-tech@...ts.sourceforge.net>,
	Andi Kleen <ak@...e.de>, Kirill Korotaev <dev@...ru>,
	Christoph Hellwig <hch@...radead.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	Matt Helsley <matthltc@...ibm.com>,
	Hugh Dickins <hugh@...itas.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)

Dave Hansen wrote:
> On Fri, 2006-09-08 at 11:33 +0400, Pavel Emelianov wrote:
>> I'm afraid we have different understandings of what a "guarantee" is.
> 
> It appears so.
> 
>> Don't we?
>> Guarantee may be one of
>>
>>   1. container will be able to touch that number of pages
>>   2. container will be able to sys_mmap() that number of pages
>>   3. container will not be killed unless it touches that number of pages
> 
> A "death sentence" guarantee?  I like it. :)
> 
>>   4. anything else
>>
>> Let's decide what kind of a guarantee we want.

I think of guarantees w.r.t resources as the lower limit on the resource.
Guarantees and limits can be thought of as the range (guarantee, limit]
for the usage of the resource.

> 
> I think of it as: "I will be allowed to use this many total pages, and
> they are guaranteed not to fail."  (1), I think.  The sum of all of the
> system's guarantees must be less than or equal to the amount of free
> memory on the machine.  
> 

Yes, totally agree.

> If we knew to which NUMA node the memory was going to go, we might as
> well take the pages out of the allocator.
> 
> -- Dave
> 
-- 

	Balbir Singh,
	Linux Technology Center,
	IBM Software Labs
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