1 #!/usr/bin/env python3
2 # SPDX-License-Identifier: GPL-2.0
3
4 import subprocess
5 import time
6
7 import _damon_sysfs
8
9 def main():
10 # access two 10 MiB memory regions, 2 second per each
11 sz_region = 10 * 1024 * 1024
12 proc = subprocess.Popen(['./access_memory', '2', '%d' % sz_region, '2000'])
13
14 # Set quota up to 1 MiB per 100 ms
15 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 age
23 nr_accesses=[5, 20], age=[2, 2**64 - 1]),
24 # aggregation interval (100 ms) is used
25 apply_interval_us=0),
26 # use 10ms apply interval
27 _damon_sysfs.Damos(
28 access_pattern=_damon_sysfs.DamosAccessPattern(
29 # >= 25% access rate, >= 200ms age
30 nr_accesses=[5, 20], age=[2, 2**64 - 1]),
31 # explicitly set 10 ms apply interval
32 apply_interval_us=10 * 1000)
33 ] # schemes
34 )] # contexts
35 )]) # kdamonds
36
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 = 0
44 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].schemes
51 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 times
57 # lower than that of the first scheme, the second scheme should be tried
58 # about ten times more frequently than the first scheme. For possible
59 # 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
66 if __name__ == '__main__':
67 main()
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