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SubjectRe: [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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