Re: [ckrm-tech] [RFC][PATCH] UBC: user resource beancounters

Alan Cox
2006-08-25T22:52:55Z

Ar Gwe, 2006-08-25 am 15:23 -0700, ysgrifennodd Chandra Seetharaman:
> > Bean counters can exist with no tasks, and the CKRM people have been
> > corrected repeatedly on this point.
>
> Hmm... from what I understand from the code, when the last resource in
> the beancounter is dropped, the beancounter is destroyed. Which to me
> means that when there are no tasks in a beancounter it will be
> destroyed. (I just tested the code and verified that the beancounter is
> destroyed when the task dies).

If a task created resource remains then the beancounter remains until
the resources are destroyed, so it may exit well after the last task (eg
an object handed to another process with a different luid is stil
charged to us)

> Let me reword the requirement: beancounter/resource group should _not_
> be destroyed implicitly. It should be destroyed only when requested by
> the user/sysadmin. In other words, we need a create_luid() and
> destroy_luid().

So that you can preserve the limits on the resource group ? That also
makes sense if you are trying to do long term resource management.

Alan