On Thu, 29 Oct 2015 17:52:16 +0000 (UTC) Mathieu Desnoyers <mathieu.desnoy...@efficios.com> wrote:
> ----- On Oct 29, 2015, at 3:07 AM, rostedt rost...@goodmis.org wrote: > > > From: "Steven Rostedt (Red Hat)" <rost...@goodmis.org> > > > > In order to guarantee that a probe will be called before other probes that > > are attached to a tracepoint, there needs to be a mechanism to provide > > priority of one probe over the others. > > > > Adding a prio field to the struct tracepoint_func, which lets the probes be > > sorted by the priority set in the structure. If no priority is specified, > > then a priority of 10 is given (this is a macro, and perhaps may be changed > > in the future). > > > > Now probes may be added to affect other probes that are attached to a > > tracepoint with a guaranteed order. > > > > One use case would be to allow tracing of tracepoints be able to filter by > > pid. A special (higher priority probe) may be added to the sched_switch > > tracepoint and set the necessary flags of the other tracepoints to notify > > them if they should be traced or not. In case a tracepoint is enabled at the > > sched_switch tracepoint too, the order of the two are not random. > > > > Cc: Mathieu Desnoyers <mathieu.desnoy...@efficios.com> > > Signed-off-by: Steven Rostedt <rost...@goodmis.org> > > Sounds good to me, > > Acked-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com> > Thanks. Unfortunately I already pushed it out to linux-next (had a deadline), otherwise I could have added your ack. I'm guessing you missed the RFC version I posted a week ago. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
