Re: [RFC PATCH 0/3] Series short description

Gregory Haskins
2008-11-11T19:46:24Z

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Chris Friesen wrote:
> Gregory Haskins wrote:
>> Hi Ingo, Steven, Peter,
>> This series applies roughly to mainline as an enhancement to the
>> sched_rt
>> logic. Peter and I were discussing some of the unecessary overhead in
>> pull_rt_tasks() via IRC, and this is my RFC attempt to address the
>> problem.
>>
>> I have built/booted this on a 4-way C2D Xeon box and it passes
>> preempt-test.
>
> At first blush it looks reasonable, but do you have any performance
> numbers?

Hi Chris,
That is a perfectly reasonable request, but unfortunately I do not
have any at this time. Its currently all based on the observation that
pull_rt_tasks() can cause excessive rq->lock contention and the theory
that this should reduce the cases where that happens. It still needs to
be proven and quantified, outside of the basic litmus test I gave it
before posting.

I will try to get to this ASAP.

Regards,
-Greg

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