[LITMUS^RT] call for testing 3.10

[Björn Brandenburg]

On Jul 18, 2013, at 1:51 PM, Björn Brandenburg <bbb at mpi-sws.org> wrote:

> 
> On Jul 18, 2013, at 11:49 AM, Björn Brandenburg <bbb at mpi-sws.org> wrote:
> 
>> the branch on top of 3.10 now runs fine in QEMU. I've given all plugins a cursory run, and they seem to work fine. (PFAIR still has the issue reported by Hiro, but this is unrelated to the kernel version).
>> 
>> The kernel can be found here:
>> 
>> 	https://github.com/LITMUS-RT/litmus-rt/commits/rebased-3.10
> 
> Under the (somewhat optimistic) assumption that the 3.10 branch works, I've back-ported rebased-3.10 on top of Linux 3.8.13, which is the version on top of which the latest PREEMPT_RT version is based. Some minor tweaks were required, but it compiles and boots in KVM. For the curious, the branch can be found here:
> 
> 	https://github.com/LITMUS-RT/litmus-rt/tree/rebased-3.8.13
> 
> The next step towards low latencies will be to actually squeeze in the PREEMPT_RT patch between 3.8.13 and the LITMUS^RT patch series… volunteers welcome. :-)

Well, turns out there were only few merge conflicts. The branch now compiles *with* PREEMPT_RT:

	https://github.com/LITMUS-RT/litmus-rt/commits/rebased-3.8.13-rt14

However, it definitely does not work. I'm seeing a recursive lock acquisition of a run queue lock via hrtimer_cancel(). Sorting this out will take more time than I have now. I think for now my priority will be to get the 3.10 tree tested and released; I'll revisit PREEMPT_RT afterwards. Anyway, the code is in the repo if anyone wants to take a look.

Thanks,
Björn

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