Re: [patch 3/5] sched: multilevel sbe and sbf

[Nick Piggin]

Ingo Molnar wrote:

> Acked-by: Ingo Molnar <mingo@xxxxxxx>
>
> note that no matter how much scheduler logic, in the end 
> cross-scheduling of tasks between nodes on NUMA will always have a 
> permanent penalty (i.e. the 'migration cost' is 'infinity' in the long 
> run), so the primary focus _hast to be_ on 'get it right initially' When 
> tasks must spill over to other nodes will always remain a special case.  
> So balance-on-fork/exec/[clone] definitely needs to be aware of the full 
> domain tree picture.

Yes, well put. I imagine this will only become more important as
there becomes more push towards multiprocessing machines, and the
need for higher memory bandwidth and lower latency to CPUs.


--
SUSE Labs, Novell Inc.

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