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 | head -n 10
2092 sb-sysfs-26 /sys/fs/cgroup/system.slice
1809 sb-sysfs-26 /sys/fs/cgroup/system.slice/systemd-udevd.service
1350 sb-btrfs-24 /sys/fs/cgroup/system.slice
1016 sb-btrfs-24 /sys/fs/cgroup/system.slice/system-dbus\x2d:1.3\x2dorg.fedoraproject.Setroubleshootd.slice
861 sb-btrfs-24 /sys/fs/cgroup/system.slice/system-dbus\x2d:1.3\x2dorg.fedoraproject.SetroubleshootPrivileged.slice
672 sb-btrfs-24 /sys/fs/cgroup/system.slice/firewalld.service
655 sb-cgroup2-30 /sys/fs/cgroup/init.scope
275 sb-sysfs-26 /
232 sb-btrfs-24 /
221 sb-proc-25 /sys/fs/cgroup/system.slice/systemd-journald.service
Signed-off-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
---
tools/cgroup/memcg_shrinker.py | 70 ++++++++++++++++++++++++++++++++++
1 file changed, 70 insertions(+)
create mode 100755 tools/cgroup/memcg_shrinker.py
diff --git a/tools/cgroup/memcg_shrinker.py b/tools/cgroup/memcg_shrinker.py
new file mode 100755
index 000000000000..9c32bf0247b2
--- /dev/null
+++ b/tools/cgroup/memcg_shrinker.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2022 Roman Gushchin <roman.gushchin@xxxxxxxxx>
+# 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_memcg_path = os.path.join(root, shrinker, "count_memcg")
+ try:
+ with open(count_memcg_path) as f:
+ for line in f.readlines():
+ items = line.split(' ')
+ ino = int(items[0])
+ shrinkers.append((int(items[1]), shrinker, ino))
+ except FileNotFoundError:
+ count_path = os.path.join(root, shrinker, "count")
+ with open(count_path) as f:
+ shrinkers.append((int(f.readline()), shrinker, 0))
+
+ # (count, shrinker, memcg ino)
+ return shrinkers
+
+
+def main():
+ cgroups = scan_cgroups("/sys/fs/cgroup/")
+ shrinkers = scan_shrinkers("/sys/kernel/debug/shrinker/")
+ shrinkers = sorted(shrinkers, reverse = True, key = lambda x: x[0])
+
+ for s in shrinkers:
+ count = s[0]
+ name = s[1]
+ ino = 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))
+
+
+if __name__ == '__main__':
+ main()
--
2.35.1
