* Oestman, Fredrik ([email protected]) wrote: > Hi, > > I've noticed the following somewhat puzzling effect on both Intel and > ARM architecture computers: > > If all trace events are enabled in one domain only, either kernel or > user space, and there are lots of static tracepoints instrumented in > the other, then these inactive tracepoints start causing overhead of > about the same magnitude as if they were active, as if trace events > were enabled in this domain. > > Is there any obvious explanation to this behaviour?
No, this would be really surprising. Can you provide your test script, and more details about the way you perform your benchmarks ? How is the overhead calculated ? From how many tracepoints hit ? How many processes spawned/exec() done ? How many tracepoints hit per process ? Thanks, Mathieu > > Cheers, > > Fredrik Östman > > http://go.mentor.com/sourceryanalyzer/ > > > _______________________________________________ > lttng-dev mailing list > [email protected] > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
