Re: [PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to init event

From	Jiri Olsa <jolsa@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to init event
Date	2016-03-11 09:40 +0100
Message-ID	<rbqM2-3qq-11@gated-at.bofh.it> (permalink)
References	<raTdn-4Ll-3@gated-at.bofh.it> <raTdo-4Ll-5@gated-at.bofh.it> <raWXF-7BC-21@gated-at.bofh.it>
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On Thu, Mar 10, 2016 at 09:39:55AM +0900, Namhyung Kim wrote:
> On Wed, Mar 09, 2016 at 09:46:42PM +0100, Jiri Olsa wrote:
> > We suppress events with attr::exclude_kernel set when
> > the event is generated, so following capture will
> > give no warning but won't produce any data:
> > 
> >   $ sudo perf record -e sched:sched_switch:u ls
> >   $ sudo /perf script | wc -l
> >   0
> > 
> > Checking the attr::exclude_(kernel|user) at the event
> > init time and failing right away for tracepoints from
> > uprobes/kprobes and native ones:
> > 
> >   $ sudo perf record -e sched:sched_switch:u ls
> >   Error:
> >   The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (sched:sched_switch).
> >   /bin/dmesg may provide additional information.
> >   No CONFIG_PERF_EVENTS=y kernel support configured?
> > 
> >   $ sudo perf record -e probe:sys_read:u ls
> >   Error:
> >   The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (probe:sys_read).
> >   /bin/dmesg may provide additional information.
> >   No CONFIG_PERF_EVENTS=y kernel support configured?
> > 
> >   $ ./perf record -e probe_ex:main:k ./ex
> >   Error:
> >   The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (probe_ex:main).
> >   /bin/dmesg may provide additional information.
> >   No CONFIG_PERF_EVENTS=y kernel support configured?
> > 
> > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> 
> Acked-by: Namhyung Kim <namhyung@kernel.org>
> 
> Maybe we need to improve the error message later.

yep, working on that ;-)

thanks,
jirka

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[PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to init event Jiri Olsa <jolsa@kernel.org> - 2016-03-09 21:50 +0100
  Re: [PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to  init event Namhyung Kim <namhyung@kernel.org> - 2016-03-10 01:50 +0100
    Re: [PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to  init event Jiri Olsa <jolsa@redhat.com> - 2016-03-11 09:40 +0100

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