Preemption question (4xx related)

Josh Boyer jwboyer at linux.vnet.ibm.com
Thu Jul 2 10:14:50 EST 2009


On Thu, Jul 02, 2009 at 08:13:13AM +1000, Benjamin Herrenschmidt wrote:
>On Tue, 2009-06-30 at 05:55 -0700, Felix Radensky wrote:
>> Hi,
>> 
>> Preemption is disabled on the vast majority of powerpc
>> targets. Are there any known problems in this area ?
>> I'd like to enable CONFIG_PREEMPT_VOLUNTARY on
>> AMCC 405EX target, to increase application responsiveness.
>> Is it a bad idea ?
>
>In theory it should work, but as you may have noticed, it's generally
>disabled and thus not very well tested.
>
>It would be a good idea for us, some of the core devs, to turn that on
>in our usual test configs in fact.

I've toyed with that idea myself.  I keep coming back to the fact that you need
a workload that would really leverage it, and I don't have one at the moment.

josh


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