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

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Dave Hansen wrote:
On Tue, 2006-09-05 at 19:02 +0400, Kirill Korotaev wrote:
Core Resource Beancounters (BC) + kernel/user memory control.

BC allows to account and control consumption
of kernel resources used by group of processes.

Hi Kirill,
I've honestly lost track of these discussions along the way, so I hope
you don't mind summarizing a bit.

Do these patches help with accounting for anything other than memory?
Will we need new user/kernel interfaces for cpu, i/o bandwidth, etc...?

Have you given any thought to the possibility that a task might need to
move between accounting contexts?  That has certainly been a
"requirement" pushed on to CKRM for a long time, and the need goes
something like this:

1. A system runs a web server, which services several virtual domains
2. that web server receives a request for foo.com
3. the web server switches into foo.com's accounting context
4. the web server reads things from disk, allocates some memory, and
   makes a database request.
5. the database receives the request, and switches into foo.com's
   accounting context, and charges foo.com for its resource use
etc...

So, the goal is to run _one_ copy of an application on a system, but
account for its resources in a much more fine-grained way than at the
application level.

I think we can probably use beancounters for this, if we do not worry
about migrating _existing_ charges when we change accounting context.
Does that make sense?

-- Dave

This is much better stated than I did. Thanks!

--

	Balbir Singh,
	Linux Technology Center,
	IBM Software Labs
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