* Peter Zijlstra (peterz@xxxxxxxxxxxxx) wrote: > On Thu, 2011-12-01 at 17:04 -0500, Mathieu Desnoyers wrote: > > * Peter Zijlstra (peterz@xxxxxxxxxxxxx) wrote: > > > On Thu, 2011-12-01 at 16:41 -0500, Mathieu Desnoyers wrote: > > > > LTTng needs this symbol to prepend the current task dynamic priority > > > > value to events (optional context information). > > > > > > I absolutely detest exporting such stuff. It propagates the idea that > > > task prio actually means something. Also, modules really shouldn't care. > > > > People debugging their SCHED_FIFO/SCHED_RR applications, as well as > > users of priority-inheritance futexes, may happen to find this > > information extremely useful. > > > > Just saying... > > Right until the moment we go do deadlines.. Anyway, it still doesn't > make sense, your sched_switch() tracepoint handler gets this > information, why do you need this export at all? If you don't want to trace sched_switch, but just conveniently prepend this information to all your events, then lttng lets you dynamically target this extra bit of information. Note that it's not a mandatory event field: I call those "context" fields that the tracer prepends to events, as requested by the user. Thanks, Mathieu -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
