* David Ahern <dsahern@xxxxxxxxx> wrote:
>
>
> On 04/29/11 08:27, tip-bot for Ingo Molnar wrote:
> > Commit-ID: 370faf1dd0461ad811852c8abbbcd3d73b1e4fc4
> > Gitweb: http://git.kernel.org/tip/370faf1dd0461ad811852c8abbbcd3d73b1e4fc4
> > Author: Ingo Molnar <mingo@xxxxxxx>
> > AuthorDate: Fri, 29 Apr 2011 16:11:03 +0200
> > Committer: Ingo Molnar <mingo@xxxxxxx>
> > CommitDate: Fri, 29 Apr 2011 16:22:33 +0200
> >
> > perf stat: Fail softly on unsupported events
> >
> > David Ahern reported this perf stat failure:
> >
> >> # /tmp/build-perf/perf stat -- sleep 1
> >> Error: stalled-cycles-frontend event is not supported.
> >> Fatal: Not all events could be opened.
> >>
> >> This is a Dell R410 with an E5620 processor.
> >
> > Fail in a softer fashion on unknown/unsupported events.
> >
> > Reported-by: David Ahern <dsahern@xxxxxxxxx>
> > Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> > Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> > Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> > Link: http://lkml.kernel.org/n/tip-7y40wib8n006io7hjpn1dsrm@xxxxxxxxxxxxxx
> > Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
> > ---
> > tools/perf/builtin-stat.c | 4 +---
> > 1 files changed, 1 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> > index 9e596ab..c8b535b 100644
> > --- a/tools/perf/builtin-stat.c
> > +++ b/tools/perf/builtin-stat.c
> > @@ -377,7 +377,7 @@ static int run_perf_stat(int argc __used, const char **argv)
> >
> > list_for_each_entry(counter, &evsel_list->entries, node) {
> > if (create_perf_stat_counter(counter) < 0) {
> > - if (errno == EINVAL || errno == ENOSYS)
> > + if (errno == EINVAL || errno == ENOSYS || errno == ENOENT)
> > continue;
> >
> > if (errno == EPERM || errno == EACCES) {
> > @@ -385,8 +385,6 @@ static int run_perf_stat(int argc __used, const char **argv)
> > "\t Consider tweaking"
> > " /proc/sys/kernel/perf_event_paranoid or running as root.",
> > system_wide ? "system-wide " : "");
> > - } else if (errno == ENOENT) {
> > - error("%s event is not supported. ", event_name(counter));
>
> This silently ignores events -- including ones that a user requested. I
> think a better option is a continue here.
>
> /tmp/build-perf/perf stat -- sleep 1
> Error: stalled-cycles-frontend event is not supported.
> Error: stalled-cycles-backend event is not supported.
Ok. Got time to send a patch for that, which prints whichever message you find
the most intuitive? Perhaps word it as:
Info: stalled-cycles-frontend event is not supported by the kernel
to not yell 'error!' at users all the time?
Thanks,
Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|