[LITMUS^RT] rebasing on top of Linux 4.1

[Namhoon Kim]

I've run Herman's experiment-scripts works with the latest
branch(93ff7fd26181f2e9544613fa7658ef75b693f681) over 6 hours. It works
fine now. I'll start compiling this branch on ARM tomorrow.

Thanks,

Namhoon

On Tue, Aug 4, 2015 at 2:51 AM, Björn Brandenburg <bbb at mpi-sws.org> wrote:

>
> On 28 Jul 2015, at 22:51, Björn Brandenburg <bbb at mpi-sws.org> wrote:
>
>
> 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.
>
>
> I’ve pushed another significant update. This bunch includes a number of
> crash fixes, a fix for the trace infrastructure, and a simplification of
> the cache-topology relevant parts of LITMUS^RT.
>
> This version seems to be quite stable on my test platforms. I’ll let it
> run stress tests for a few days, and if nothing else crops up, this will
> become the next release. I’d appreciate additional test reports, especially
> on ARM, which I can’t test at the moment.
>
> Thanks,
> Björn
>
>
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>
>
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