1 #!/usr/bin/env python3
2 #
3 # Copyright (C) 2022 Roman Gushchin <roman.gushchin@linux.dev>
4 # Copyright (C) 2022 Meta
5
6 import os
7 import argparse
8
9
10 def scan_cgroups(cgroup_root):
11 cgroups = {}
12
13 for root, subdirs, _ in os.walk(cgroup_root):
14 for cgroup in subdirs:
15 path = os.path.join(root, cgroup)
16 ino = os.stat(path).st_ino
17 cgroups[ino] = path
18
19 # (memcg ino, path)
20 return cgroups
21
22
23 def scan_shrinkers(shrinker_debugfs):
24 shrinkers = []
25
26 for root, subdirs, _ in os.walk(shrinker_debugfs):
27 for shrinker in subdirs:
28 count_path = os.path.join(root, shrinker, "count")
29 with open(count_path) as f:
30 for line in f.readlines():
31 items = line.split(' ')
32 ino = int(items[0])
33 # (count, shrinker, memcg ino)
34 shrinkers.append((int(items[1]), shrinker, ino))
35 return shrinkers
36
37
38 def main():
39 parser = argparse.ArgumentParser(description='Display biggest shrinkers')
40 parser.add_argument('-n', '--lines', type=int, help='Number of lines to print')
41
42 args = parser.parse_args()
43
44 cgroups = scan_cgroups("/sys/fs/cgroup/")
45 shrinkers = scan_shrinkers("/sys/kernel/debug/shrinker/")
46 shrinkers.sort(reverse = True, key = lambda x: x[0])
47
48 n = 0
49 for s in shrinkers:
50 count, name, ino = (s[0], s[1], s[2])
51 if count == 0:
52 break
53
54 if ino == 0 or ino == 1:
55 cg = "/"
56 else:
57 try:
58 cg = cgroups[ino]
59 except KeyError:
60 cg = "unknown (%d)" % ino
61
62 print("%-8s %-20s %s" % (count, name, cg))
63
64 n += 1
65 if args.lines and n >= args.lines:
66 break
67
68
69 if __name__ == '__main__':
70 main()
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