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36cedcdc6f
Add simple example to traverse cgroup v2 hierarchy. It can be run w/o arguments and in this case root cgroup will be used: # python36 -m drgn examples/linux/cgroup.py | wc -l 1081 # python36 -m drgn examples/linux/cgroup.py | shuf -n 3 /system.slice/nfs-idmapd.service /user.slice/user-0.slice/user@0.service/dev-hugepages.mount /system.slice/crond.service Or a path in cgroup v2 filesystem can be specified to limit the traversal by this path: # python36 -m drgn examples/linux/cgroup.py /sys/fs/cgroup/www.slice /www.slice /www.slice/hack.service /www.slice/flow.service Signed-off-by: Andrey Ignatov <rdna@fb.com>
41 lines
925 B
Python
Executable File
41 lines
925 B
Python
Executable File
"""List the paths of all descendants of a cgroup v2"""
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import os
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import sys
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from contextlib import contextmanager
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from drgn import cast
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from drgn.helpers.linux import (
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cgroup_path,
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css_for_each_descendant_pre,
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fget,
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find_task,
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)
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@contextmanager
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def open_dir(*args, **kwds):
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# Built-in open() context manager can't deal with directories.
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fd = os.open(*args, **kwds)
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try:
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yield fd
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finally:
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os.close(fd)
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def get_cgroup():
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if len(sys.argv) == 1:
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return prog["cgrp_dfl_root"].cgrp
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task = find_task(prog, os.getpid())
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with open_dir(sys.argv[1], os.O_RDONLY) as fd:
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file_ = fget(task, fd)
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kn = cast("struct kernfs_node *", file_.f_path.dentry.d_inode.i_private)
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return cast("struct cgroup *", kn.priv)
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css = get_cgroup().self.address_of_()
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for pos in css_for_each_descendant_pre(css):
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print(cgroup_path(pos.cgroup).decode())
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