[LITMUS^RT] rebasing on top of Linux 4.1

[Björn Brandenburg]

> On 28 Jul 2015, at 19:38, Björn Brandenburg <bbb at mpi-sws.org> wrote:
> 
>> 
>> On 27 Jul 2015, at 18:00, Björn Brandenburg <bbb at mpi-sws.org> wrote:
>> 
>> On 21 Jul 2015, at 19:08, Björn Brandenburg <bbb at mpi-sws.org> wrote:
>>> 
>>> 
>>>> On 20 Jul 2015, at 19:16, Björn Brandenburg <bbb at mpi-sws.org> wrote:
>>>> 
>>>> However, there are also some known problem:
>>>> 
>>>> 1) When switching to the PFAIR plugin, there’s sometimes a deadlock (+ report from lockdep). Probably some minor fix to adjust to code churn, but this needs to be investigated. 
>>>> 
>>>> 2) Budget enforcement is broken: self-suspending tasks + strict budget enforcement causes BUG_ON violations. This also needs further investigation.
>>> 
>>> These should both be fixed now. At the moment, the next branch seems to be quite stable in Qemu. Please test with your setups.
>> 
>> I’ve pushed a couple more fixes today. The liblitmus test suite has also seen a couple of improvements.
> 
> Another bunch of patches. One of them fixes the preemption state machine, which in turn has uncovered a bug in the SRP implementation due to the Linux scheduler changes. The corresponding SRP tests are currently failing.

Last update for now: I’ve pushed a few more patches that fix the SRP test failure and another race in PFAIR that happened rarely if a task resumed just before the end of a quantum in which it exhausted its current budget. The current version passes all tests and seems to run ok in both Qemu and on my 4-core x86 test machine. Further testing is very welcome, of course.

Thanks,
Björn

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