Re: [PATCH 0/5] SUBCPUSETS: a resource control functionality using CPUSETS

[Hirokazu Takahashi <taka@valinux.co.jp>]

Hi,

> > What do you think if you make cpusets for sched domain be able to
> > have their siblings, which have the same attribute and share
> > their resources between them.
> 
> I do not understand this question.  I guess "cpusets for sched
> domains" means "cpusets whose 'cpu_exclusive' attribute is
> marked true, but which have no child cpusets so marked."

Yes.

> But even that guess I am unsure of, and the rest of the sentence
> "which have the same ..." I don't even have a guess what means.

Sorry for the poor explanation.
I just thought that it wouldn't be bad to allow "each cpuset whose
cpu_exclusive attribute is mark true" to have its clones like the
figure below. In this case, cpu-2 and cpu-3 will be used exclusively
for the clones --- CPUSET 1, 2, and 3 ---.

I guess it seems very similar to one of your ideas except for reusing
cpu_exclusive flag. Do you think reusing the flag is good idea?


     +-------------------+----------------+----------------+
     |                   |                |                |
  CPUSET 0            CPUSET 1         CPUSET 2         CPUSET 3
  sched domain A      sched domain B   sched domain B   sched domain B
  cpus: 0, 1          cpus: 2, 3       cpus: 2, 3       cpus: 2, 3
  cpu_exclusive       cpu_exclusive    cpu_exclusive    cpu_exclusive 
                      meter_cpu        meter_cpu        meter_cpu
                      <------should we call it resouce domain?------>


Thanks,
Hirokazu Takahashi.