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 <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Steven Rostedt (VMware) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

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