68 lines · python
1#!/usr/bin/env python32# SPDX-License-Identifier: GPL-2.03 4import subprocess5import time6 7import _damon_sysfs8 9def main():10 # access two 10 MiB memory regions, 2 second per each11 sz_region = 10 * 1024 * 102412 proc = subprocess.Popen(['./access_memory', '2', '%d' % sz_region, '2000'])13 14 # Set quota up to 1 MiB per 100 ms15 kdamonds = _damon_sysfs.Kdamonds([_damon_sysfs.Kdamond(16 contexts=[_damon_sysfs.DamonCtx(17 ops='vaddr',18 targets=[_damon_sysfs.DamonTarget(pid=proc.pid)],19 schemes=[20 _damon_sysfs.Damos(21 access_pattern=_damon_sysfs.DamosAccessPattern(22 # >= 25% access rate, >= 200ms age23 nr_accesses=[5, 20], age=[2, 2**64 - 1]),24 # aggregation interval (100 ms) is used25 apply_interval_us=0),26 # use 10ms apply interval27 _damon_sysfs.Damos(28 access_pattern=_damon_sysfs.DamosAccessPattern(29 # >= 25% access rate, >= 200ms age30 nr_accesses=[5, 20], age=[2, 2**64 - 1]),31 # explicitly set 10 ms apply interval32 apply_interval_us=10 * 1000)33 ] # schemes34 )] # contexts35 )]) # kdamonds36 37 err = kdamonds.start()38 if err != None:39 print('kdamond start failed: %s' % err)40 exit(1)41 42 wss_collected = []43 nr_quota_exceeds = 044 while proc.poll() == None:45 time.sleep(0.1)46 err = kdamonds.kdamonds[0].update_schemes_stats()47 if err != None:48 print('stats update failed: %s' % err)49 exit(1)50 schemes = kdamonds.kdamonds[0].contexts[0].schemes51 nr_tried_stats = [s.stats.nr_tried for s in schemes]52 if nr_tried_stats[0] == 0 or nr_tried_stats[1] == 0:53 print('scheme(s) are not tried')54 exit(1)55 56 # Because the second scheme was having the apply interval that is ten times57 # lower than that of the first scheme, the second scheme should be tried58 # about ten times more frequently than the first scheme. For possible59 # timing errors, check if it was at least nine times more freuqnetly tried.60 ratio = nr_tried_stats[1] / nr_tried_stats[0]61 if ratio < 9:62 print('%d / %d = %f (< 9)' %63 (nr_tried_stats[1], nr_tried_stats[0], ratio))64 exit(1)65 66if __name__ == '__main__':67 main()68