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selftests/damon: add a test for DAMOS quota goal

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Add a selftest for DAMOS quota goal.  It tests the feature by setting a
user_input metric based goal, change the current feedback, and check if
the effective quota size is increased and decreased as expected.

Link: https://lkml.kernel.org/r/20240502172718.74166-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2024-05-02 10:27:18 -07:00 committed by Andrew Morton
parent d14d6b0e7d
commit f1c07c0a16
2 changed files with 78 additions and 1 deletions
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2
tools/testing/selftests/damon/Makefile
View file

@ -16,7 +16,7 @@ TEST_PROGS += debugfs_target_ids_pid_leak.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 damos_apply_interval.py
TEST_PROGS += damos_quota.py damos_quota_goal.py damos_apply_interval.py
TEST_PROGS += reclaim.sh lru_sort.sh
include ../lib.mk

77
tools/testing/selftests/damon/damos_quota_goal.py Normal file
View file

@ -0,0 +1,77 @@
#!/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'])
goal = _damon_sysfs.DamosQuotaGoal(
metric=_damon_sysfs.qgoal_metric_user_input, target_value=10000)
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',
quota=_damon_sysfs.DamosQuota(
goals=[goal], reset_interval_ms=100),
)] # schemes
)] # contexts
)]) # kdamonds
err = kdamonds.start()
if err != None:
print('kdamond start failed: %s' % err)
exit(1)
score_values_to_test = [0, 15000, 5000, 18000]
while proc.poll() == None:
if len(score_values_to_test) == 0:
time.sleep(0.1)
continue
goal.current_value = score_values_to_test.pop(0)
expect_increase = goal.current_value < goal.target_value
err = kdamonds.kdamonds[0].commit_schemes_quota_goals()
if err is not None:
print('commit_schemes_quota_goals failed: %s' % err)
exit(1)
err = kdamonds.kdamonds[0].update_schemes_effective_quotas()
if err is not None:
print('before-update_schemes_effective_quotas failed: %s' % err)
exit(1)
last_effective_bytes = goal.effective_bytes
time.sleep(0.5)
err = kdamonds.kdamonds[0].update_schemes_effective_quotas()
if err is not None:
print('after-update_schemes_effective_quotas failed: %s' % err)
exit(1)
print('score: %s, effective quota: %d -> %d (%.3fx)' % (
goal.current_value, last_effective_bytes, goal.effective_bytes,
goal.effective_bytes / last_effective_bytes
if last_effective_bytes != 0 else -1.0))
if last_effective_bytes == goal.effective_bytes:
print('efective bytes not changed: %d' % goal.effective_bytes)
exit(1)
increased = last_effective_bytes < goal.effective_bytes
if expect_increase != increased:
print('expectation of increase (%s) != increased (%s)' %
(expect_increase, increased))
exit(1)
last_effective_bytes = goal.effective_bytes
if __name__ == '__main__':
main()