perf test: Allow skip for all metrics test

Some Intel TMA metrics compute a ratio that may divide by 0, which
causes the metric not to print. This happens for metrics with FP_ARITH
events. If we see these events in the result and would otherwise fail,
then switch to a skip.

Also, don't early exit when processing metrics.

Reviewed-by: John Garry <john.garry@huawei.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20220201015858.1226914-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/stat_all_metrics.sh

@@ -4,6 +4,7 @@
 
 set -e
 
+err=0
 for m in $(perf list --raw-dump metrics); do
   echo "Testing $m"
   result=$(perf stat -M "$m" true 2>&1)
@@ -14,9 +15,14 @@ for m in $(perf list --raw-dump metrics); do
     if [[ ! "$result" =~ "$m" ]]; then
       echo "Metric '$m' not printed in:"
       echo "$result"
-      exit 1
+      if [[ "$result" =~ "FP_ARITH" && "$err" != "1" ]]; then
+        echo "Skip, not fail, for FP issues"
+        err=2
+      else
+        err=1
+      fi
     fi
   fi
 done
 
-exit 0
+exit "$err"