Re: [RFC] cpuset: remove sched domain hooks from cpusets

[Paul Jackson <pj@sgi.com>]

Martin wrote:
> We (Google) are planning to use it to do some partitioning, albeit on
> much smaller machines. I'd really like to NOT use cpus_allowed from
> previous experience - if we can get it to to partition using separated
> sched domains, that would be much better.

Why not use cpus_allowed for this, via cpusets and/or sched_setaffinity?

In the followup to this between Paul M. and myself, I wrote:
> As best as I can tell, the two motivations for explicity setting
> sched domain partitions are:
>  1) isolating cpus for real time uses very sensitive to any interference,
>  2) handling load balancing on huge CPU counts, where the worse than linear
>     algorithms start to hurt.
> ...
> How many CPUs are you juggling?

And Paul M. replied:
> Not many by your standards - less than eight in general.

So ... it would seem you have neither huge CPU counts nor real time
sensitivities.

So why not use cpus_allowed?

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                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401