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