linux-kernel - [RFC PATCH 4/6] selftests/damon/sysfs.py: test monitoring attribute parameters

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Message-Id: <20250622210330.40490-5-sj@kernel.org>
Date: Sun, 22 Jun 2025 14:03:28 -0700
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuah@...nel.org>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 4/6] selftests/damon/sysfs.py: test monitoring attribute parameters

Add DAMON sysfs interface functionality tests for DAMON monitoring
attribute parameters, including intervals, intervals tuning goals, and
min/max number of regions.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 tools/testing/selftests/damon/sysfs.py | 34 ++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/damon/sysfs.py b/tools/testing/selftests/damon/sysfs.py
index 4ff99db0d247..a721901a880d 100755
--- a/tools/testing/selftests/damon/sysfs.py
+++ b/tools/testing/selftests/damon/sysfs.py
@@ -20,6 +20,11 @@ def dump_damon_status_dict(pid):
     except Exception as e:
         return None, 'json.load fail (%s)' % e
 
+def fail(expectation, status):
+    print('unexpected %s' % expectation)
+    print(json.dumps(status, indent=4))
+    exit(1)
+
 def main():
     kdamonds = _damon_sysfs.Kdamonds(
             [_damon_sysfs.Kdamond(contexts=[_damon_sysfs.DamonCtx()])])
@@ -34,8 +39,33 @@ def main():
         exit(1)
 
     if len(status['contexts']) != 1:
-        print('number of contexts: %d' % len(status['contexts']))
-        exit(1)
+        fail('number of contexts', status)
+
+    ctx = status['contexts'][0]
+    attrs = ctx['attrs']
+    if attrs['sample_interval'] != 5000:
+        fail('sample interval', status)
+    if attrs['aggr_interval'] != 100000:
+        fail('aggr interval', status)
+    if attrs['ops_update_interval'] != 1000000:
+        fail('ops updte interval', status)
+
+    if attrs['intervals_goal'] != {
+            'access_bp': 0, 'aggrs': 0,
+            'min_sample_us': 0, 'max_sample_us': 0}:
+        fail('intervals goal')
+
+    if attrs['min_nr_regions'] != 10:
+        fail('min_nr_regions')
+    if attrs['max_nr_regions'] != 1000:
+        fail('max_nr_regions')
+
+    if ctx['adaptive_targets'] != []:
+        fail('adaptive_targets')
+
+    if ctx['schemes'] != []:
+        fail('schemes')
+
     kdamonds.stop()
 
 if __name__ == '__main__':
-- 
2.39.5