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#!/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
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]),
# aggregation interval (100 ms) is used
apply_interval_us=0),
# use 10ms apply interval
_damon_sysfs.Damos(
access_pattern=_damon_sysfs.DamosAccessPattern(
# >= 25% access rate, >= 200ms age
nr_accesses=[5, 20], age=[2, 2**64 - 1]),
# explicitly set 10 ms apply interval
apply_interval_us=10 * 1000)
] # 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_stats()
if err != None:
print('stats update failed: %s' % err)
exit(1)
schemes = kdamonds.kdamonds[0].contexts[0].schemes
nr_tried_stats = [s.stats.nr_tried for s in schemes]
if nr_tried_stats[0] == 0 or nr_tried_stats[1] == 0:
print('scheme(s) are not tried')
exit(1)
# Because the second scheme was having the apply interval that is ten times
# lower than that of the first scheme, the second scheme should be tried
# about ten times more frequently than the first scheme. For possible
# timing errors, check if it was at least nine times more freuqnetly tried.
ratio = nr_tried_stats[1] / nr_tried_stats[0]
if ratio < 9:
print('%d / %d = %f (< 9)' %
(nr_tried_stats[1], nr_tried_stats[0], ratio))
exit(1)
if __name__ == '__main__':
main()
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