perf test: Add basic stat and topdown group test

Add a basic stat test.

Add two tests of grouping behavior for topdown events. Topdown events
are special as they must be grouped with the slots event first.

Reviewed-by: Kan Liang <[e-mail]>
Signed-off-by: Ian Rogers <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Florian Fischer <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: John Garry <[e-mail]>
Cc: Kim Phillips <[e-mail]>
Cc: Madhavan Srinivasan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Riccardo Mancini <[e-mail]>
Cc: Shunsuke Nakamura <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Cc: Xing Zhengjun <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/stat.sh

···
+#!/bin/sh
+# perf stat tests
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+err=0
+test_default_stat() {
+  echo "Basic stat command test"
+  if ! perf stat true 2>&1 | egrep -q "Performance counter stats for 'true':"
+  then
+    echo "Basic stat command test [Failed]"
+    err=1
+    return
+  fi
+  echo "Basic stat command test [Success]"
+}
+
+test_topdown_groups() {
+  # Topdown events must be grouped with the slots event first. Test that
+  # parse-events reorders this.
+  echo "Topdown event group test"
+  if ! perf stat -e '{slots,topdown-retiring}' true > /dev/null 2>&1
+  then
+    echo "Topdown event group test [Skipped event parsing failed]"
+    return
+  fi
+  if perf stat -e '{slots,topdown-retiring}' true 2>&1 | egrep -q "<not supported>"
+  then
+    echo "Topdown event group test [Failed events not supported]"
+    err=1
+    return
+  fi
+  if perf stat -e '{topdown-retiring,slots}' true 2>&1 | egrep -q "<not supported>"
+  then
+    echo "Topdown event group test [Failed slots not reordered first]"
+    err=1
+    return
+  fi
+  echo "Topdown event group test [Success]"
+}
+
+test_topdown_weak_groups() {
+  # Weak groups break if the perf_event_open of multiple grouped events
+  # fails. Breaking a topdown group causes the events to fail. Test a very large
+  # grouping to see that the topdown events aren't broken out.
+  echo "Topdown weak groups test"
+  ok_grouping="{slots,topdown-bad-spec,topdown-be-bound,topdown-fe-bound,topdown-retiring},branch-instructions,branch-misses,bus-cycles,cache-misses,cache-references,cpu-cycles,instructions,mem-loads,mem-stores,ref-cycles,cache-misses,cache-references"
+  if ! perf stat --no-merge -e "$ok_grouping" true > /dev/null 2>&1
+  then
+    echo "Topdown weak groups test [Skipped event parsing failed]"
+    return
+  fi
+  group_needs_break="{slots,topdown-bad-spec,topdown-be-bound,topdown-fe-bound,topdown-retiring,branch-instructions,branch-misses,bus-cycles,cache-misses,cache-references,cpu-cycles,instructions,mem-loads,mem-stores,ref-cycles,cache-misses,cache-references}:W"
+  if perf stat --no-merge -e "$group_needs_break" true 2>&1 | egrep -q "<not supported>"
+  then
+    echo "Topdown weak groups test [Failed events not supported]"
+    err=1
+    return
+  fi
+  echo "Topdown weak groups test [Success]"
+}
+
+test_default_stat
+test_topdown_groups
+test_topdown_weak_groups
+exit $err