On Thu, Nov 26, 2015 at 04:41:06PM -0300, Arnaldo Carvalho de Melo wrote: > Em Thu, Nov 26, 2015 at 08:34:48PM +0100, Jiri Olsa escreveu: > > We suppress events with attr::exclude_kernel set when > > the event is generated, so following capture will > > give no warning and produce no data: > > > > $ sudo perf record -e sched:sched_switch:u ls > > $ sudo /perf script | wc -l > > 0 > > > > Checking the attr::exclude_kernel at the event init > > time and failing right away: > > We can as well provide a better warning in the tooling side and don't > even ask this nonsensical combo to the kernel, right?
yep.. I'll update my todo ;-) > > Arguably the kernel was doing what was asked for, its just that no > sched:sched_switch took place while in user space... ;-) I think it's better to fail like that.. rather than spending time on figuring why my test did not give me any data ;-) jirka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
