I was thinking of tracking locks and above all interrupt disable through debugfs. Something along the lines of a buffer with the top offenders in it, and thus getting a list of the longest latency introducing sections. Or would it be 'better' to instrument with something like kprobes and have a utility for this functionality ? Any further idea of stuff to trace ? or has this already been done and I am unaware of it ? I basicly want a list of the sections in the kernel that disables preemption for the longest time. / regards, Lars Segerlund. -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html