LTTng 0.10.0-pre22 supports multiple probes

Hi,

I just released lttng 0.10.0-pre22 for Linux 2.6.24-rc2, which adds
support for multiple callbacks connected to a single marker. I make
extensive use the kernel RCU mechanism so batch connexion of probes to
different markers can be done as quickly as possible, requiring to wait
for quiescent state only when necessary. It proves to be important when
connecting probes on busy systems, where waiting for ~50
synchronize_sched() could take about 1-2 minutes.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68