perf tests task_analyzer: Skip tests if no libtraceevent support

Test "perf script task-analyzer tests" fails in environment with missing
libtraceevent support, as perf record fails to create the perf.data
file, which further tests depend on.

Instead, when perf is not compiled with libtraceevent support, skip
those tests instead of failing them, by checking the output of `perf
record --dry-run` to see if it prints the error "libtraceevent is
necessary for tracepoint support"

For the following output, perf compiled with: `make NO_LIBTRACEEVENT=1`

Before the patch:

108: perf script task-analyzer tests                                 :
test child forked, pid 24105
failed to open perf.data: No such file or directory  (try 'perf record' first)
FAIL: "invokation of perf script report task-analyzer command failed" Error message: ""
FAIL: "test_basic" Error message: "Failed to find required string:'Comm'."
failed to open perf.data: No such file or directory  (try 'perf record' first)
FAIL: "invokation of perf script report task-analyzer --ns --rename-comms-by-tids 0:random command failed" Error message: ""
FAIL: "test_ns_rename" Error message: "Failed to find required string:'Comm'."
failed to open perf.data: No such file or directory  (try 'perf record' first)
<...>
perf script task-analyzer tests: FAILED!

With this patch, the script instead returns 2 signifying SKIP, and after
the patch:

108: perf script task-analyzer tests                                 :
test child forked, pid 26010
libtraceevent is necessary for tracepoint support
WARN: Skipping tests. No libtraceevent support
test child finished with -2
perf script task-analyzer tests: Skip

Fixes: e8478b84d6ba9ccf ("perf test: Add new task-analyzer tests")
Signed-off-by: Aditya Gupta <[email protected]>
Cc: Disha Goel <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Petar Gligoric <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Athira Rajeev <[email protected]>
Signed-off-by: Kajol Jain <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

1 files changed, 18 insertions, 0 deletions

diff --git a/tools/perf/tests/shell/test_task_analyzer.sh b/tools/perf/tests/shell/test_task_analyzer.sh
index b094eeb3bf66..59785dfc11f8 100755
--- a/tools/perf/tests/shell/test_task_analyzer.sh
+++ b/tools/perf/tests/shell/test_task_analyzer.sh
@@ -44,9 +44,20 @@ find_str_or_fail() {
 	fi
 }
 
+# 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
+	return 0
+}
+
 prepare_perf_data() {
 	# 1s should be sufficient to catch at least some switches
 	perf record -e sched:sched_switch -a -- sleep 1 > /dev/null 2>&1
+	# check if perf data file got created in above step.
+	if [ ! -e "perf.data" ]; then
+		printf "FAIL: perf record failed to create \"perf.data\" \n"
+		return 1
+	fi
 }
 
 # check standard inkvokation with no arguments
@@ -134,6 +145,13 @@ test_csvsummary_extended() {
 	find_str_or_fail "Out-Out;" csvsummary "${FUNCNAME[0]}"
 }
 
+skip_no_probe_record_support
+err=$?
+if [ $err -ne 0 ]; then
+	echo "WARN: Skipping tests. No libtraceevent support"
+	cleanup
+	exit $err
+fi
 prepare_perf_data
 test_basic
 test_ns_rename