Frank Ch. Eigler wrote:
quoted text
> Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> writes:
>
>   
>> [...]
>> The problem is also in _stp_print_flush, not *only* in relay code:
>> void _stp_print_flush (void)
>> ...
>>                 spin_lock(&_stp_print_lock);
>>                 ...
>>                 spin_unlock(&_stp_print_lock);
>>
>> Those will turn into mutexes with -rt.
>>     
>
> Indeed, plus systemtap-generated locking code uses rwlocks,
> local_irq_save/restore or preempt_disable, in various places.  Could
> someone point to a place that spells out what would be more
> appropriate way of ensuring atomicity while being compatible with -rt?
>   

https://ols2006.108.redhat.com/2007/Reprints/rostedt-Reprint.pdf

And his slides too, haven't checked if they are already only at the OLS 
site.

- Arnaldo
-
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