Frank Ch. Eigler wrote:
Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx> 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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