[PATCH 1/2] tools/perf/tests: perf all metrics test fails when perf_event access is restricted

[Namhyung Kim]

On Mon, Jul 3, 2023 at 10:04 PM Athira Rajeev
<atrajeev at linux.vnet.ibm.com> wrote:
>
>
>
> > On 15-Jun-2023, at 1:08 PM, Athira Rajeev <atrajeev at linux.vnet.ibm.com> wrote:
> >
> > Perf all metrics test fails as below when perf_event access
> > is restricted.
> >
> >    ./perf test -v "perf all metrics test"
> >    Metric 'Memory_RD_BW_Chip' not printed in:
> >    Error:
> >    Access to performance monitoring and observability operations is limited.
> >    Enforced MAC policy settings (SELinux) can limit access to performance
> >    —
> >    access to performance monitoring and observability operations for processes
> >    without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.
> >    —
> >    test child finished with -1
> >    ---- end ----
> >    perf all metrics test: FAILED!

In my system, it fails like below:

  $ ./perf test -v 101
  101: perf all metrics test                                           :
  --- start ---
  test child forked, pid 398458
  Testing branch_misprediction_ratio
  Testing all_remote_links_outbound
  Metric 'all_remote_links_outbound' not printed in:
  Error:
  Invalid event (remote_outbound_data_controller_3:u) in per-thread
mode, enable system wide with '-a'.
  Testing nps1_die_to_dram
  ...

Thanks,
Namhyung

>
>
> Hi,
>
> Looking for review comments on this patch.
>
> Thanks
> >
> > The perf all metrics test picks the input events from
> > "perf list --raw-dump metrics" and runs "perf stat -M "$m""
> > for each of the metrics in the list. It fails here for some
> > of the metrics which needs access, since it collects system
> > wide resource details/statistics. Fix the testcase to skip
> > those metric events.
> >
> > Signed-off-by: Athira Rajeev <atrajeev at linux.vnet.ibm.com>
> > ---
> > tools/perf/tests/shell/stat_all_metrics.sh | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/perf/tests/shell/stat_all_metrics.sh b/tools/perf/tests/shell/stat_all_metrics.sh
> > index 54774525e18a..14b96484a359 100755
> > --- a/tools/perf/tests/shell/stat_all_metrics.sh
> > +++ b/tools/perf/tests/shell/stat_all_metrics.sh
> > @@ -6,7 +6,9 @@ err=0
> > for m in $(perf list --raw-dump metrics); do
> >   echo "Testing $m"
> >   result=$(perf stat -M "$m" true 2>&1)
> > -  if [[ "$result" =~ ${m:0:50} ]] || [[ "$result" =~ "<not supported>" ]]
> > +  # Skip if there is no access to perf_events monitoring
> > +  # and observability operations
> > +  if [[ "$result" =~ ${m:0:50} ]] || [[ "$result" =~ "<not supported>" ]] || [[ "$result" =~ "Access to performance monitoring and observability operations is limited" ]]
> >   then
> >     continue
> >   fi
> > --
> > 2.31.1
> >
>