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Date: Thu, 26 Nov 2015 17:44:28 -0300 From: Arnaldo Carvalho de Melo <acme@...nel.org> To: Jiri Olsa <jolsa@...hat.com> Cc: Jiri Olsa <jolsa@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, lkml <linux-kernel@...r.kernel.org>, David Ahern <dsahern@...il.com>, Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [PATCH 2/3] perf: Move exclude_kernel tracepoint check to init event Em Thu, Nov 26, 2015 at 08:49:10PM +0100, Jiri Olsa escreveu: > 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 ;-) Thanks! > > 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 ;-) Up to peterz ;-) - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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