Peter Williams wrote:
<snip>
But you don't need something as complex as CKRM either. This capping
All CKRM^W Resource Groups does is to group unrelated/related tasks to a
group and apply resource limits.
functionality coupled with (the lamented) PAGG patches (should have been
called TAGG for "task aggregation" instead of PAGG for "process
aggregation") would allow you to implement a kernel module that could
apply caps to arbitrary groups of tasks.
I do not follow how PAGG + this cap feature can be used to put cap of
related/unrelated tasks. Can you provide little more explanation,
please.
I would have thought it was fairly obvious. PAGG supplies the task
aggregation mechanism, these patches provide per task caps and all
that's needed is the code that marries the two.
The problem is that with per-task caps, if I have a resource group A
and I want to limit it to 10%, I need to limit each task in resource
group A to 10% (which makes resource groups not so useful). Is my
understanding correct? Is there a way to distribute the group limit
across tasks in the resource group?
Also, i do not think it can provide guarantees to that group of tasks.
can it ?
It could do that by manipulating nice which is already available in the
kernel.
I.e. these patches plus improved statistics (which are coming, I hope)
together with the existing policy controls provide all that is necessary
to do comprehensive CPU resource control. If there is an efficient way
to get the statistics out to user space (also coming, I hope) this
control could be exercised from user space.
Could you please provide me with a link to the new improved statistics.
What do the new statistics contain - any heads up on them?
Peter
--
Balbir Singh,
Linux Technology Center,
IBM Software Labs
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