Re: question on sched-rt group allocation cap: sched_rt_runtime_us

[Peter Zijlstra]

On Tue, 2009-09-08 at 00:08 -0700, Anirban Sinha wrote:

> > Actually there is, use cpusets to carve the system into partitions.
> 
> hmm. ok. I looked at the code a little bit. It seems to me that the  
> 'borrowing' of RT runtimes occurs only from rt runqueues belonging to  
> the same root domain. And partition_sched_domains() is the only  
> external interface that can be used to create root domain out of a CPU  
> set. But then I think it needs to have CGROUPS/USER groups enabled?  
> Right?

No you need cpusets, you create a partition by disabling load-balancing
on the top set, thereby only allowing load-balancing withing the
children.

The runtime sharing is a form of load-balancing.

CONFIG_CPUSETS=y

Documentation/cgroups/cpusets.txt

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/