perf test: Add a new shell test for perf ftrace

  $ sudo ./perf test ftrace -vv
   86: perf ftrace tests:
  --- start ---
  test child forked, pid 1772223
  perf ftrace list test
  syscalls for sleep:
  __x64_sys_nanosleep
  __ia32_sys_nanosleep
  __x64_sys_clock_nanosleep
  __ia32_sys_clock_nanosleep
  perf ftrace list test  [Success]
  perf ftrace trace test
  # tracer: function_graph
  #
  # CPU  DURATION                  FUNCTION CALLS
  # |     |   |                     |   |   |   |
   0)               |  __x64_sys_clock_nanosleep() {
   0)               |    common_nsleep() {
   0)               |      hrtimer_nanosleep() {
   0)               |        do_nanosleep() {
  perf ftrace trace test  [Success]
  perf ftrace latency test
  target function: __x64_sys_clock_nanosleep
  #   DURATION     |      COUNT | GRAPH                                          |
      32 - 64   ms |          1 | ############################################## |
  perf ftrace latency test  [Success]
  perf ftrace profile test
  # Total (us)   Avg (us)   Max (us)      Count   Function
    100136.400 100136.400 100136.400          1   __x64_sys_clock_nanosleep
    100135.200 100135.200 100135.200          1   common_nsleep
    100134.700 100134.700 100134.700          1   hrtimer_nanosleep
    100133.700 100133.700 100133.700          1   do_nanosleep
    100130.600 100130.600 100130.600          1   schedule
       166.868     55.623     80.299          3   scheduler_tick
         5.926      5.926      5.926          1   native_smp_send_reschedule
       301.941    301.941    301.941          1   __x64_sys_execve
       295.786    295.786    295.786          1   do_execveat_common.isra.0
        71.397     35.699     46.403          2   bprm_execve
         2.519      1.260      1.547          2   sched_mm_cid_before_execve
         1.098      0.549      0.686          2   sched_mm_cid_after_execve
  perf ftrace profile test  [Success]
  ---- end(0) ----
   86: perf ftrace tests                                               : Ok
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20240808044954.1775333-1-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/ftrace.sh

+#!/bin/sh
+# perf ftrace tests
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+# perf ftrace commands only works for root
+if [ "$(id -u)" != 0 ]; then
+    echo "perf ftrace test  [Skipped: no permission]"
+    exit 2
+fi
+
+output=$(mktemp /tmp/__perf_test.ftrace.XXXXXX)
+
+cleanup() {
+  rm -f "${output}"
+
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
+# this will be set in test_ftrace_trace()
+target_function=
+
+test_ftrace_list() {
+    echo "perf ftrace list test"
+    perf ftrace -F > "${output}"
+    # this will be used in test_ftrace_trace()
+    sleep_functions=$(grep 'sys_.*sleep$' "${output}")
+    echo "syscalls for sleep:"
+    echo "${sleep_functions}"
+    echo "perf ftrace list test  [Success]"
+}
+
+test_ftrace_trace() {
+    echo "perf ftrace trace test"
+    perf ftrace trace --graph-opts depth=5 sleep 0.1 > "${output}"
+    # it should have some function name contains 'sleep'
+    grep "^#" "${output}"
+    grep -F 'sleep()' "${output}"
+    # find actual syscall function name
+    for FN in ${sleep_functions}; do
+	if grep -q "${FN}" "${output}"; then
+	    target_function="${FN}"
+	    echo "perf ftrace trace test  [Success]"
+	    return
+	fi
+    done
+
+    echo "perf ftrace trace test  [Failure: sleep syscall not found]"
+    exit 1
+}
+
+test_ftrace_latency() {
+    echo "perf ftrace latency test"
+    echo "target function: ${target_function}"
+    perf ftrace latency -T "${target_function}" sleep 0.1 > "${output}"
+    grep "^#" "${output}"
+    grep "###" "${output}"
+    echo "perf ftrace latency test  [Success]"
+}
+
+test_ftrace_profile() {
+    echo "perf ftrace profile test"
+    perf ftrace profile sleep 0.1 > "${output}"
+    grep ^# "${output}"
+    grep sleep "${output}"
+    grep schedule "${output}"
+    grep execve "${output}"
+    echo "perf ftrace profile test  [Success]"
+}
+
+test_ftrace_list
+test_ftrace_trace
+test_ftrace_latency
+test_ftrace_profile
+
+cleanup
+exit 0