Add a python-written DAMON sysfs functionality selftest. It sets DAMON
parameters using Python module _damon_sysfs, reads updated kernel
internal DAMON status and parameters using a 'drgn' script, namely
drgn_dump_damon_status.py, and compare if the resulted DAMON internal
status is as expected. The test is very minimum at the moment.
Signed-off-by: SeongJae Park <s...@kernel.org>
---
tools/testing/selftests/damon/Makefile | 1 +
tools/testing/selftests/damon/sysfs.py | 42 ++++++++++++++++++++++++++
2 files changed, 43 insertions(+)
create mode 100755 tools/testing/selftests/damon/sysfs.py
diff --git a/tools/testing/selftests/damon/Makefile
b/tools/testing/selftests/damon/Makefile
index e888455e3cf8..5b230deb19e8 100644
--- a/tools/testing/selftests/damon/Makefile
+++ b/tools/testing/selftests/damon/Makefile
@@ -7,6 +7,7 @@ TEST_FILES = _damon_sysfs.py
# functionality tests
TEST_PROGS += sysfs.sh
+TEST_PROGS += sysfs.py
TEST_PROGS += sysfs_update_schemes_tried_regions_wss_estimation.py
TEST_PROGS += damos_quota.py damos_quota_goal.py damos_apply_interval.py
TEST_PROGS += damos_tried_regions.py damon_nr_regions.py
diff --git a/tools/testing/selftests/damon/sysfs.py
b/tools/testing/selftests/damon/sysfs.py
new file mode 100755
index 000000000000..4ff99db0d247
--- /dev/null
+++ b/tools/testing/selftests/damon/sysfs.py
@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+import json
+import os
+import subprocess
+
+import _damon_sysfs
+
+def dump_damon_status_dict(pid):
+ file_dir = os.path.dirname(os.path.abspath(__file__))
+ dump_script = os.path.join(file_dir, 'drgn_dump_damon_status.py')
+ rc = subprocess.call(['drgn', dump_script, pid, 'damon_dump_output'],
+ stderr=subprocess.DEVNULL)
+ if rc != 0:
+ return None, 'drgn fail'
+ try:
+ with open('damon_dump_output', 'r') as f:
+ return json.load(f), None
+ except Exception as e:
+ return None, 'json.load fail (%s)' % e
+
+def main():
+ kdamonds = _damon_sysfs.Kdamonds(
+ [_damon_sysfs.Kdamond(contexts=[_damon_sysfs.DamonCtx()])])
+ err = kdamonds.start()
+ if err is not None:
+ print('kdamond start failed: %s' % err)
+ exit(1)
+
+ status, err = dump_damon_status_dict(kdamonds.kdamonds[0].pid)
+ if err is not None:
+ print(err)
+ exit(1)
+
+ if len(status['contexts']) != 1:
+ print('number of contexts: %d' % len(status['contexts']))
+ exit(1)
+ kdamonds.stop()
+
+if __name__ == '__main__':
+ main()
--
2.39.5
