perf tests task_analyzer: Check perf build options for libtraceevent support

Currently we depend on output of 'perf record -e "sched:sched_switch"', to
check whether perf was built with libtraceevent support.

Instead, a more straightforward approach can be to check the build options,
using 'perf version --build-options', to check for libtraceevent support.

When perf is compiled WITHOUT libtraceevent ('make NO_LIBTRACEEVENT=1'),
'perf version --build-options' outputs (output trimmed):

	 ...
         libtraceevent: [ OFF ]  # HAVE_LIBTRACEEVENT
	 ...

While, when perf is compiled WITH libtraceevent,

'perf version --build-options' outputs:

...
         libtraceevent: [ on ]  # HAVE_LIBTRACEEVENT
	 ...

Committer notes:

Removed one grep in the pipleline by combining the two into just one
expression that covers the OFF + HAVE_LIBTRACEEVENT.

Suggested-by: Ian Rogers <irogers@google.com>
Signed-off-by: Aditya Gupta <adityag@linux.ibm.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Disha Goel <disgoel@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20230725061649.34937-1-adityag@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/tests/shell/test_task_analyzer.sh b/tools/perf/tests/shell/test_task_analyzer.sh
index 0095abb..92d1515 100755 (executable)
--- a/tools/perf/tests/shell/test_task_analyzer.sh
+++ b/tools/perf/tests/shell/test_task_analyzer.sh
@@ -52,7 +52,7 @@ find_str_or_fail() {
 
 # check if perf is compiled with libtraceevent support
 skip_no_probe_record_support() {
-       perf record -e "sched:sched_switch" -a -- sleep 1 2>&1 | grep "libtraceevent is necessary for tracepoint support" && return 2
+       perf version --build-options | grep -q " OFF .* HAVE_LIBTRACEEVENT" && return 2
        return 0
 }