The patch titled
Subject: selftests/damon: implement DAMOS tried regions test
has been added to the -mm mm-unstable branch. Its filename is
selftests-damon-implement-damos-tried-regions-test.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-damon-implement-damos-tried-regions-test.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: implement DAMOS tried regions test
Date: Tue, 25 Jun 2024 11:05:34 -0700
Implement a test for DAMOS tried regions command of DAMON sysfs interface.
It ensures the expected number of monitoring regions are created using an
artificial memory access pattern generator program.
Link: https://lkml.kernel.org/r/20240625180538.73134-5-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/damos_tried_regions.py | 65 ++++++++++
2 files changed, 66 insertions(+)
--- /dev/null
+++ a/tools/testing/selftests/damon/damos_tried_regions.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+import subprocess
+import time
+
+import _damon_sysfs
+
+def main():
+ # repeatedly access even-numbered ones in 14 regions of 10 MiB size
+ sz_region = 10 * 1024 * 1024
+ proc = subprocess.Popen(['./access_memory_even', '14', '%d' % sz_region])
+
+ # stat every monitored regions
+ kdamonds = _damon_sysfs.Kdamonds([_damon_sysfs.Kdamond(
+ contexts=[_damon_sysfs.DamonCtx(
+ ops='vaddr',
+ targets=[_damon_sysfs.DamonTarget(pid=proc.pid)],
+ schemes=[_damon_sysfs.Damos(action='stat',
+ )] # schemes
+ )] # contexts
+ )]) # kdamonds
+
+ err = kdamonds.start()
+ if err is not None:
+ proc.terminate()
+ print('kdamond start failed: %s' % err)
+ exit(1)
+
+ collected_nr_regions = []
+ while proc.poll() is None:
+ time.sleep(0.1)
+ err = kdamonds.kdamonds[0].update_schemes_tried_regions()
+ if err is not None:
+ proc.terminate()
+ print('tried regions update failed: %s' % err)
+ exit(1)
+
+ scheme = kdamonds.kdamonds[0].contexts[0].schemes[0]
+ if scheme.tried_regions is None:
+ proc.terminate()
+ print('tried regions is not collected')
+ exit(1)
+
+ nr_tried_regions = len(scheme.tried_regions)
+ if nr_tried_regions <= 0:
+ proc.terminate()
+ print('tried regions is not created')
+ exit(1)
+ collected_nr_regions.append(nr_tried_regions)
+ if len(collected_nr_regions) > 10:
+ break
+ proc.terminate()
+
+ collected_nr_regions.sort()
+ sample = collected_nr_regions[4]
+ print('50-th percentile nr_regions: %d' % sample)
+ print('expectation (>= 14) is %s' % 'met' if sample >= 14 else 'not met')
+ if collected_nr_regions[4] < 14:
+ print('full nr_regions:')
+ print('\n'.join(collected_nr_regions))
+ exit(1)
+
+if __name__ == '__main__':
+ main()
--- a/tools/testing/selftests/damon/Makefile~selftests-damon-implement-damos-tried-regions-test
+++ a/tools/testing/selftests/damon/Makefile
@@ -13,6 +13,7 @@ TEST_PROGS = debugfs_attrs.sh debugfs_sc
TEST_PROGS += sysfs.sh
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
TEST_PROGS += reclaim.sh lru_sort.sh
# regression tests (reproducers of previously found bugs)
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
mm-damon-core-merge-regions-aggressively-when-max_nr_regions-is-unmet.patch
docs-mm-damon-maintainer-profile-introduce-hackermail.patch
docs-mm-damon-maintainer-profile-document-damon-community-meetups.patch
selftests-damon-access_memory-use-user-defined-region-size.patch
selftests-damon-_damon_sysfs-support-schemes_update_tried_regions.patch
selftests-damon-implement-a-program-for-even-numbered-memory-regions-access.patch
selftests-damon-implement-damos-tried-regions-test.patch
selftests-damon-_damon_sysfs-implement-kdamonds-stop-function.patch
selftests-damon-implement-test-for-min-max_nr_regions.patch
_damon_sysfs-implement-commit-for-online-parameters-update.patch
selftests-damon-damon_nr_regions-test-online-tuned-max_nr_regions.patch
