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SubjectRe: [Question] Hooks for scheduler tracing (CFS)
Frank Ch. Eigler wrote:
> 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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