Re: Priority Inheritance Test (Real-Time Preemption)

[Ingo Molnar]

* Esben Nielsen <simlo@xxxxxxxxxx> wrote:

> Hi,
>  From realfeel I wrote a small, simple test to test how well priority
> inheritance mechanism works. 

cool - this is a really useful testsuite.

> I tested it on V0.7.26-0 and my own U9.2-priom. Both implementations
> fails when the mutex is congested by more than 1 non-real-time task.
> [...]

i can confirm your measurements.

I have fixed all the PI bugs that your suite uncovered (there were quite
a number of them!), the fixes are included in the V0.7.30-0 patch
available at the usual place:

   http://redhat.com/~mingo/realtime-preempt/

with this patch i get the expected histogram with entries only in the
0-1 msec buckets.

	Ingo
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