linux/tools/cgroup/memcg_shrinker.py
Roman Gushchin d261ea2353 tools: add memcg_shrinker.py
Add a simple tool which prints a sorted list of shrinker lists in the
following format: (number of objects, shrinker name, cgroup).

Example:
  $ ./memcg_shrinker.py -n 10
  2090     sb-sysfs-26          /sys/fs/cgroup/system.slice
  1809     sb-sysfs-26          /sys/fs/cgroup/system.slice/systemd-udevd.service
  1044     sb-btrfs:vda2-24     /sys/fs/cgroup/system.slice/system-dbus\x2d:1.3\...
  861      sb-btrfs:vda2-24     /sys/fs/cgroup/system.slice/system-dbus\x2d:1.3\...
  804      sb-btrfs:vda2-24     /sys/fs/cgroup/system.slice
  643      sb-btrfs:vda2-24     /sys/fs/cgroup/system.slice/firewalld.service
  616      sb-cgroup2-30        /sys/fs/cgroup/init.scope
  275      sb-sysfs-26          /
  238      sb-proc-25           /sys/fs/cgroup/system.slice/systemd-journald.service
  225      sb-proc-25           /sys/fs/cgroup/system.slice/abrtd.service

Link: https://lkml.kernel.org/r/20220601032227.4076670-6-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-07-03 18:08:40 -07:00

72 lines
1.8 KiB
Python

#!/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()