perf test: Add a basic offcpu profiling test

  $ sudo ./perf test -v offcpu
   88: perf record offcpu profiling tests                              :
  --- start ---
  test child forked, pid 685966
  Basic off-cpu test
  Basic off-cpu test [Success]
  test child finished with 0
  ---- end ----
  perf record offcpu profiling tests: Ok
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Blake Jones <blakejones@google.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20220518224725.742882-7-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/record_offcpu.sh

+#!/bin/sh
+# perf record offcpu profiling tests
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+err=0
+perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
+
+cleanup() {
+  rm -f ${perfdata}
+  rm -f ${perfdata}.old
+  trap - exit term int
+}
+
+trap_cleanup() {
+  cleanup
+  exit 1
+}
+trap trap_cleanup exit term int
+
+test_offcpu() {
+  echo "Basic off-cpu test"
+  if [ `id -u` != 0 ]
+  then
+    echo "Basic off-cpu test [Skipped permission]"
+    err=2
+    return
+  fi
+  if perf record --off-cpu -o ${perfdata} --quiet true 2>&1 | grep BUILD_BPF_SKEL
+  then
+    echo "Basic off-cpu test [Skipped missing BPF support]"
+    err=2
+    return
+  fi
+  if ! perf record --off-cpu -e dummy -o ${perfdata} sleep 1 2> /dev/null
+  then
+    echo "Basic off-cpu test [Failed record]"
+    err=1
+    return
+  fi
+  if ! perf evlist -i ${perfdata} | grep -q "offcpu-time"
+  then
+    echo "Basic off-cpu test [Failed record]"
+    err=1
+    return
+  fi
+  if ! perf report -i ${perfdata} -q --percent-limit=90 | egrep -q sleep
+  then
+    echo "Basic off-cpu test [Failed missing output]"
+    err=1
+    return
+  fi
+  echo "Basic off-cpu test [Success]"
+}
+
+test_offcpu
+
+cleanup
+exit $err