perf tests ftrace: Add pattern check for time, count

In 'perf ftrace profile sleep 0.1' we know that we'll have an specific
kernel function that will take a bit more than 0.1 seconds and will take
place just one time, so we can add a check for that so that we validate
more than just the presence of some functions in the profile.

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: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Steven Rostedt (VMware) <[e-mail]>
Link: https://lore.kernel.org/lkml/ZrTBo7KACZeuCyLj@x1
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/ftrace.sh

···
     grep sleep "${output}"
     grep schedule "${output}"
     grep execve "${output}"
+    time_re="[[:space:]]+10[[:digit:]]{4}\.[[:digit:]]{3}"
+    # 100283.000 100283.000 100283.000          1   __x64_sys_clock_nanosleep
+    # Check for one *clock_nanosleep line with a Count of just 1 that takes a bit more than 0.1 seconds
+    # Strip the _x64_sys part to work with other architectures
+    grep -E "^${time_re}${time_re}${time_re}[[:space:]]+1[[:space:]]+.*clock_nanosleep" "${output}"
     echo "perf ftrace profile test  [Success]"
 }