perf test: Fix perf record test for precise_max

On s390 the event instructions can not be used for recording.
This event is only supported by perf stat.

Test that each event cycles and instructions supports sampling.
If the event can not be sampled, skip it.

Signed-off-by: Thomas Richter <[email protected]>
Suggested-by: James Clark <[email protected]>
Reviewed-by: James Clark <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: Thomas Richter

tools/perf/tests/shell/record.sh

@@ -273,27 +273,42 @@ test_topdown_leader_sampling() {
 }
 
 test_precise_max() {
+  local -i skipped=0
+
   echo "precise_max attribute test"
-  if ! perf stat -e "cycles,instructions" true 2> /dev/null
+  # Just to make sure event cycles is supported for sampling
+  if perf record -o "${perfdata}" -e "cycles" true 2> /dev/null
   then
-    echo "precise_max attribute [Skipped no hardware events]"
-    return
+    if ! perf record -o "${perfdata}" -e "cycles:P" true 2> /dev/null
+    then
+      echo "precise_max attribute [Failed cycles:P event]"
+      err=1
+      return
+    fi
+  else
+    echo "precise_max attribute [Skipped no cycles:P event]"
+    ((skipped+=1))
   fi
-  # Just to make sure it doesn't fail
-  if ! perf record -o "${perfdata}" -e "cycles:P" true 2> /dev/null
+  # On s390 event instructions is not supported for perf record
+  if perf record -o "${perfdata}" -e "instructions" true 2> /dev/null
   then
-    echo "precise_max attribute [Failed cycles:P event]"
-    err=1
-    return
+    # On AMD, cycles and instructions events are treated differently
+    if ! perf record -o "${perfdata}" -e "instructions:P" true 2> /dev/null
+    then
+      echo "precise_max attribute [Failed instructions:P event]"
+      err=1
+      return
+    fi
+  else
+    echo "precise_max attribute [Skipped no instructions:P event]"
+    ((skipped+=1))
   fi
-  # On AMD, cycles and instructions events are treated differently
-  if ! perf record -o "${perfdata}" -e "instructions:P" true 2> /dev/null
+  if [ $skipped -eq 2 ]
   then
-    echo "precise_max attribute [Failed instructions:P event]"
-    err=1
-    return
+    echo "precise_max attribute [Skipped no hardware events]"
+  else
+    echo "precise_max attribute test [Success]"
   fi
-  echo "precise_max attribute test [Success]"
 }
 
 # raise the limit of file descriptors to minimum