diff options
author | Roman Gushchin | 2022-05-31 20:22:26 -0700 |
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committer | akpm | 2022-07-03 18:08:40 -0700 |
commit | d261ea23533b5da113b0779f32d39c3803dddb02 (patch) | |
tree | f00c5c2e56ffe60d535c91dc69149f17d009e2ae | |
parent | 7507f0991d59169b75a09aa21ffa8ffeda58116f (diff) |
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>
-rw-r--r-- | tools/cgroup/memcg_shrinker.py | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/tools/cgroup/memcg_shrinker.py b/tools/cgroup/memcg_shrinker.py new file mode 100644 index 000000000000..706ab27666a4 --- /dev/null +++ b/tools/cgroup/memcg_shrinker.py @@ -0,0 +1,71 @@ +#!/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() |