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#!/usr/bin/env python3
#
# Copyright (C) 2022 Roman Gushchin <roman.gushchin@linux.dev>
# Copyright (C) 2022 Meta
import os
import argparse
import sys
def scan_cgroups(cgroup_root):
cgroups = {}
for root, subdirs, _ in os.walk(cgroup_root):
for cgroup in subdirs:
path = os.path.join(root, cgroup)
ino = os.stat(path).st_ino
cgroups[ino] = path
# (memcg ino, path)
return cgroups
def scan_shrinkers(shrinker_debugfs):
shrinkers = []
for root, subdirs, _ in os.walk(shrinker_debugfs):
for shrinker in subdirs:
count_path = os.path.join(root, shrinker, "count")
with open(count_path) as f:
for line in f.readlines():
items = line.split(' ')
ino = int(items[0])
# (count, shrinker, memcg ino)
shrinkers.append((int(items[1]), shrinker, ino))
return shrinkers
def main():
parser = argparse.ArgumentParser(description='Display biggest shrinkers')
parser.add_argument('-n', '--lines', type=int, help='Number of lines to print')
args = parser.parse_args()
cgroups = scan_cgroups("/sys/fs/cgroup/")
shrinkers = scan_shrinkers("/sys/kernel/debug/shrinker/")
shrinkers = sorted(shrinkers, reverse = True, key = lambda x: x[0])
n = 0
for s in shrinkers:
count, name, ino = (s[0], s[1], s[2])
if count == 0:
break
if ino == 0 or ino == 1:
cg = "/"
else:
try:
cg = cgroups[ino]
except KeyError:
cg = "unknown (%d)" % ino
print("%-8s %-20s %s" % (count, name, cg))
n += 1
if args.lines and n >= args.lines:
break
if __name__ == '__main__':
main()
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