Re: [Xenomai] I-pipe on ARM platform.

[Jan Kiszka <jan.kiszka@web.de>]

On 2013-04-07 20:47, Gilles Chanteperdrix wrote:
> On 04/07/2013 06:55 PM, Gilles Chanteperdrix wrote:
> 
>> On 04/06/2013 11:48 AM, Jan Kiszka wrote:
>>
>>> On 2013-04-04 22:58, Gilles Chanteperdrix wrote:
>>>> - ftrace is broken, so I wonder if it would not be simpler to have a 
>>>> tracer not relying on ftrace, as we did at the beginning of the I-pipe 
>>>> tracer;
> 
>> (...)
> 
>>
>> Hi,
>>
>> I have just pushed a new version of the for-core-3.8.2 branch with all
>> the comments addressed.
>>
>> I also had tested a merge of the previous version with your next-x86
>> branch, and except a few merge conflicts and a build error without SMP,
>> adressed by this commit:
>> http://git.xenomai.org/ipipe-gch.git/?p=ipipe-gch.git;a=commitdiff;h=fae81444a0bfe12de514ac039f866c0f66abfb3c;hp=1198253580e0d5610ee886e1ff3771461a06f414

Thanks for the fix, will pick it up as well.

>>
>> It seemed to work fine on my x86 boxes.
> 
> 
> The fixes in the next-x86 branch seem to make the tracer working, 
> though it seems very slow (latencies doubled on ARM).

You mean the I-pipe tracer? That it works is likely due to e00888b4aa.
The slowness, is it compared to an older I-pipe version?

>  The changes in 
> timings seem to break some of the regression tests,

Timeouts fire?

> I also get a 
> reproducible bug on at91sam9263 while running the "cond-torture-native" 
> test:
> 
> [  202.650000] Xenomai: Switching main_task to secondary mode after exception #8 in kernel-space at 0xc0093418 (pid 986)
...
> [  203.470000] Unable to handle kernel paging request at virtual address 20c0041e

I suppose that address is totally off. Use after release issue?

Jan


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