The patch titled
Subject: selftests/damon: add a test for update_schemes_tried_regions hang bug
has been added to the -mm mm-unstable branch. Its filename is
selftests-damon-add-a-test-for-update_schemes_tried_regions-hang-bug.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-damon-add-a-test-for-update_schemes_tried_regions-hang-bug.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: selftests/damon: add a test for update_schemes_tried_regions hang bug
Date: Tue, 12 Dec 2023 19:48:10 +0000
Add a test for reproducing the update_schemes_tried_{regions,bytes}
command-causing indefinite hang bug that fixed by commit 7d6fa31a2fd7
("mm/damon/sysfs-schemes: add timeout for update_schemes_tried_regions"),
to avoid mistakenly re-introducing the bug. Refer to the fix commit for
more details of the bug.
Link: https://lkml.kernel.org/r/20231212194810.54457-6-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/damon/Makefile | 1
tools/testing/selftests/damon/sysfs_update_schemes_tried_regions_hang.py | 33 ++++++++++
2 files changed, 34 insertions(+)
--- a/tools/testing/selftests/damon/Makefile~selftests-damon-add-a-test-for-update_schemes_tried_regions-hang-bug
+++ a/tools/testing/selftests/damon/Makefile
@@ -10,6 +10,7 @@ TEST_PROGS += debugfs_empty_targets.sh d
TEST_PROGS += debugfs_duplicate_context_creation.sh
TEST_PROGS += debugfs_rm_non_contexts.sh
TEST_PROGS += sysfs.sh sysfs_update_removed_scheme_dir.sh
+TEST_PROGS += sysfs_update_schemes_tried_regions_hang.py
TEST_PROGS += sysfs_update_schemes_tried_regions_wss_estimation.py
TEST_PROGS += reclaim.sh lru_sort.sh
--- /dev/null
+++ a/tools/testing/selftests/damon/sysfs_update_schemes_tried_regions_hang.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+import subprocess
+import time
+
+import _damon_sysfs
+
+def main():
+ proc = subprocess.Popen(['sleep', '2'])
+ kdamonds = _damon_sysfs.Kdamonds([_damon_sysfs.Kdamond(
+ contexts=[_damon_sysfs.DamonCtx(
+ ops='vaddr',
+ targets=[_damon_sysfs.DamonTarget(pid=proc.pid)],
+ schemes=[_damon_sysfs.Damos(
+ access_pattern=_damon_sysfs.DamosAccessPattern(
+ nr_accesses=[200, 200]))] # schemes
+ )] # contexts
+ )]) # kdamonds
+
+ err = kdamonds.start()
+ if err != None:
+ print('kdmaond start failed: %s' % err)
+ exit(1)
+
+ while proc.poll() == None:
+ err = kdamonds.kdamonds[0].update_schemes_tried_bytes()
+ if err != None:
+ print('tried bytes update failed: %s' % err)
+ exit(1)
+
+if __name__ == '__main__':
+ main()
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
mm-damon-core-make-damon_start-waits-until-kdamond_fn-starts.patch
selftests-damon-implement-a-python-module-for-test-purpose-damon-sysfs-controls.patch
selftests-damon-_damon_sysfs-implement-kdamonds-start-function.patch
selftests-damon-_damon_sysfs-implement-updat_schemes_tried_bytes-command.patch
selftests-damon-add-a-test-for-update_schemes_tried_regions-sysfs-command.patch
selftests-damon-add-a-test-for-update_schemes_tried_regions-hang-bug.patch
