Re: [RFC] sched: CPU topology try

[Preeti U Murthy]

On 01/07/2014 03:20 PM, Peter Zijlstra wrote:
> On Tue, Jan 07, 2014 at 03:10:21PM +0530, Preeti U Murthy wrote:
>> What if we want to add arch specific flags to the NUMA domain? Currently
>> with Peter's patch:https://lkml.org/lkml/2013/11/5/239 and this patch,
>> the arch can modify the sd flags of the topology levels till just before
>> the NUMA domain. In sd_init_numa(), the flags for the NUMA domain get
>> initialized. We need to perhaps call into arch here to probe for
>> additional flags?
> 
> What are you thinking of? I was hoping all NUMA details were captured in
> the distance table.
> 
> Its far easier to talk of specifics in this case.
> 
If the processor can be core gated, then there is very little power
savings that we could yield from consolidating all the load onto a
single node in a NUMA domain. 6 cores on one node or 3 cores each on two
nodes, the power is drawn by 6 cores in all. So I was thinking under
this circumstance we might want to set the SD_SHARE_POWERDOMAIN flag at
the NUMA domain and spread the load if it favours the workload.

Regards
Preeti U Murthy

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