On an idle embedded system, run-stackprof-system*.sh will fail due to
lack of background activity yielding 0 samples. Fix this by imitating
existing run-native-test.sh and launching a sh 'while true' loop in
the background to guarantee that some samples are collected.
(No time limit; we use trap+kill+wait to clean up the sh process when
the testcase exits.)
* tests/stackprof_subr.sh (testjob): New var, tracks job PID.
(testjob_launch): Launch a sh loop and assign to testjob.
(kill_testjob): On exit, kill+wait $testjob to clean up.
(testjob_cleanup): New helper, runs on abnormal exit (1,2,15).
(testjob_exit): New helper, runs on normal exit (0).
* tests/run-stackprof-system.sh: Invoke testjob_launch to guarantee
some samples are collected.
* tests/run-stackprof-system-gprof.sh: Invoke testjob_launch to
guarantee some samples are collected.
---
tests/run-stackprof-system-gprof.sh | 3 +++
tests/run-stackprof-system.sh | 3 +++
tests/stackprof-subr.sh | 32 +++++++++++++++++++++++++++++
3 files changed, 38 insertions(+)
diff --git a/tests/run-stackprof-system-gprof.sh
b/tests/run-stackprof-system-gprof.sh
index c281167c..980a35be 100755
--- a/tests/run-stackprof-system-gprof.sh
+++ b/tests/run-stackprof-system-gprof.sh
@@ -29,6 +29,9 @@ expr `whoami` = "root" || (echo "not running as root"; exit
77)
tempfiles test.out
+# guarantee background load on idle systems (cleaned up on exit)
+testjob_launch
+
# run systemwide scan, no gprof output
testrun timeout -p --kill-after=5 10 ${abs_top_builddir}/src/stackprof -v 2>&1
| tee test.out
grep "^perf_event_attr configuration" test.out
diff --git a/tests/run-stackprof-system.sh b/tests/run-stackprof-system.sh
index cb796a71..af64e7f1 100755
--- a/tests/run-stackprof-system.sh
+++ b/tests/run-stackprof-system.sh
@@ -28,6 +28,9 @@ expr `whoami` = "root" || (echo "not running as root"; exit
77)
tempfiles test.out
+# guarantee background load on idle systems (cleaned up on exit)
+testjob_launch
+
# run systemwide scan, no gprof output
testrun timeout -p --kill-after=5 10 ${abs_top_builddir}/src/stackprof -v 2>&1
| tee test.out
grep "^perf_event_attr configuration" test.out
diff --git a/tests/stackprof-subr.sh b/tests/stackprof-subr.sh
index 67c30d47..896c2fe8 100644
--- a/tests/stackprof-subr.sh
+++ b/tests/stackprof-subr.sh
@@ -18,6 +18,38 @@
. $srcdir/test-subr.sh
+# to launch and cleanup a background process
+testjob=0
+
+testjob_launch()
+{
+ trap testjob_cleanup 1 2 15
+ trap testjob_exit 0
+ { /bin/sh -c 'while true; do true; done' >/dev/null 2>&1 & testjob=$! ; } &&
+ sleep 0.1
+}
+
+kill_testjob()
+{
+ test $testjob -eq 0 || {
+ kill -9 $testjob 2> /dev/null || :
+ wait $testjob 2> /dev/null || :
+ }
+ testjob=0
+}
+
+testjob_cleanup()
+{
+ kill_testjob
+ test_cleanup
+}
+
+testjob_exit()
+{
+ testjob_cleanup
+ exit_cleanup
+}
+
check_perf_event_open() {
tempfiles perf-test.out
if ! testrun timeout 2 ${abs_top_builddir}/src/stackprof -v -- /bin/true >
perf-test.out 2>&1; then
--
2.54.0
