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Message-ID: <4501B5F0.9050802@in.ibm.com>
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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