On Tue, 16 Oct 2012, Lars Segerlund wrote: > 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. Hi Lars - Have a look at ftrace, I think it does what you are looking for. In the kernel source read, Documentation/trace/ftrace.txt Look at "preemptoff" to see how to record the amount of time preemption is disabled. John -- 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
