perf test stat: Avoid hybrid assumption when virtualized

The cycles event will fallback to task-clock in the hybrid test when
running virtualized. Change the test to not fail for this.

Fixes: 65d1182 ("perf test: Add a test for default perf stat command")
Reviewed-by: James Clark <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: captain5050

tools/perf/tests/shell/stat.sh

@@ -187,7 +187,11 @@ test_hybrid() {
   # Run default Perf stat
   cycles_events=$(perf stat -- true 2>&1 | grep -E "/cycles/[uH]*|  cycles[:uH]*  " -c)
 
-  if [ "$pmus" -ne "$cycles_events" ]
+  # The expectation is that default output will have a cycles events on each
+  # hybrid PMU. In situations with no cycles PMU events, like virtualized, this
+  # can fall back to task-clock and so the end count may be 0. Fail if neither
+  # condition holds.
+  if [ "$pmus" -ne "$cycles_events" ] && [ "0" -ne "$cycles_events" ]
   then
     echo "hybrid test [Found $pmus PMUs but $cycles_events cycles events. Failed]"
     err=1