lkml.org 
[lkml]   [2015]   [Nov]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/3] perf: Move exclude_kernel tracepoint check to init event
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


\
 
 \ /
  Last update: 2015-11-26 21:01    [W:0.046 / U:0.336 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site