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

[Balbir Singh <balbir@in.ibm.com>]

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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