The quilt patch titled
Subject: selftests/damon: add a test for DAMOS quota
has been removed from the -mm tree. Its filename was
selftests-damon-add-a-test-for-damos-quota.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: selftests/damon: add a test for DAMOS quota
Date: Wed, 7 Feb 2024 12:31:30 -0800
Add a selftest for verifying the DAMOS quota feature. The test is very
similar to sysfs_update_schemes_tried_regions_wss_estimation.py. It
starts an artificial workload of 20 MiB working set, run DAMON to find the
working set size, but with 1 MiB/100 ms size quota. Then, it collect the
DAMON-found working set size every 100 ms and check if the quota was
always applied as expected. For the confirmation, the tests shows the
stat-applied region size and the qt_exceeds stat.
Link: https://lkml.kernel.org/r/20240207203134.69976-5-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_quota.py | 67 +++++++++++++++++
2 files changed, 68 insertions(+)
--- /dev/null
+++ a/tools/testing/selftests/damon/damos_quota.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+import subprocess
+import time
+
+import _damon_sysfs
+
+def main():
+ # access two 10 MiB memory regions, 2 second per each
+ sz_region = 10 * 1024 * 1024
+ proc = subprocess.Popen(['./access_memory', '2', '%d' % sz_region, '2000'])
+
+ # Set quota up to 1 MiB per 100 ms
+ sz_quota = 1024 * 1024 # 1 MiB
+ quota_reset_interval = 100 # 100 ms
+ 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(
+ # >= 25% access rate, >= 200ms age
+ nr_accesses=[5, 20], age=[2, 2**64 - 1]),
+ quota=_damon_sysfs.DamosQuota(
+ sz=sz_quota, reset_interval_ms=quota_reset_interval)
+ )] # schemes
+ )] # contexts
+ )]) # kdamonds
+
+ err = kdamonds.start()
+ if err != None:
+ print('kdamond start failed: %s' % err)
+ exit(1)
+
+ wss_collected = []
+ nr_quota_exceeds = 0
+ while proc.poll() == None:
+ time.sleep(0.1)
+ err = kdamonds.kdamonds[0].update_schemes_tried_bytes()
+ if err != None:
+ print('tried bytes update failed: %s' % err)
+ exit(1)
+ err = kdamonds.kdamonds[0].update_schemes_stats()
+ if err != None:
+ print('stats update failed: %s' % err)
+ exit(1)
+
+ scheme = kdamonds.kdamonds[0].contexts[0].schemes[0]
+ wss_collected.append(scheme.tried_bytes)
+ nr_quota_exceeds = scheme.stats.qt_exceeds
+
+ wss_collected.sort()
+ for wss in wss_collected:
+ if wss > sz_quota:
+ print('quota is not kept: %s > %s' % (wss, sz_quota))
+ print('collected samples are as below')
+ print('\n'.join(['%d' % wss for wss in wss_collected]))
+ exit(1)
+
+ if nr_quota_exceeds < len(wss_collected):
+ print('quota is not always exceeded: %d > %d' %
+ (len(wss_collected), nr_quota_exceeds))
+ exit(1)
+
+if __name__ == '__main__':
+ main()
--- a/tools/testing/selftests/damon/Makefile~selftests-damon-add-a-test-for-damos-quota
+++ a/tools/testing/selftests/damon/Makefile
@@ -12,6 +12,7 @@ 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 += damos_quota.py
TEST_PROGS += reclaim.sh lru_sort.sh
include ../lib.mk
_
Patches currently in -mm which might be from sj@xxxxxxxxxx are
docs-mm-damon-maintainer-profile-fix-reference-links-for-mm-stable-tree.patch
docs-mm-damon-move-the-list-of-damos-actions-to-design-doc.patch
docs-mm-damon-move-damon-operation-sets-list-from-the-usage-to-the-design-document.patch
docs-mm-damon-move-damon-operation-sets-list-from-the-usage-to-the-design-document-fix.patch
docs-mm-damon-move-monitoring-target-regions-setup-detail-from-the-usage-to-the-design-document.patch
docs-admin-guide-mm-damon-usage-fix-wrong-quotas-diabling-condition.patch
mm-damon-core-set-damos_quota-esz-as-public-field-and-document.patch
mm-damon-sysfs-schemes-implement-quota-effective_bytes-file.patch
mm-damon-sysfs-implement-a-kdamond-command-for-updating-schemes-effective-quotas.patch
docs-abi-damon-document-effective_bytes-sysfs-file.patch
docs-admin-guide-mm-damon-usage-document-effective_bytes-file.patch
mm-damon-move-comments-and-fields-for-damos-quota-prioritization-to-the-end.patch
mm-damon-core-split-out-quota-goal-related-fields-to-a-struct.patch
mm-damon-core-add-multiple-goals-per-damos_quota-and-helpers-for-those.patch
mm-damon-sysfs-use-only-quota-goals.patch
mm-damon-core-remove-goal-field-of-damos_quota.patch
mm-damon-core-let-goal-specified-with-only-target-and-current-values.patch
mm-damon-core-support-multiple-metrics-for-quota-goal.patch
mm-damon-core-implement-psi-metric-damos-quota-goal.patch
mm-damon-sysfs-schemes-support-psi-based-quota-auto-tune.patch
docs-mm-damon-design-document-quota-goal-self-tuning.patch
docs-abi-damon-document-quota-goal-metric-file.patch
docs-admin-guide-mm-damon-usage-document-quota-goal-metric-file.patch
docs-admin-guide-mm-damon-usage-document-quota-goal-metric-file-fix.patch
mm-damon-reclaim-implement-user-feedback-driven-quota-auto-tuning.patch
mm-damon-reclaim-implement-memory-psi-driven-quota-self-tuning.patch
docs-admin-guide-mm-damon-reclaim-document-auto-tuning-parameters.patch
