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tools/cgroup: iocost_monitor: parse help before importing drgn

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iocost_monitor.py imports drgn before argparse can handle "-h" or report
argument errors. That makes basic usage help fail on systems where drgn is
not installed.

Parse arguments before importing drgn so the help and argument-error paths
work without the runtime debugging dependency. Normal execution still
imports drgn before reading kernel state.

Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Yousef Alhouseen 2026-06-24 14:36:52 +02:00 committed by Tejun Heo
parent f0e6f20cb5
commit a2ba161d17
1 changed files with 5 additions and 5 deletions
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tools/cgroup/iocost_monitor.py
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@ -15,11 +15,6 @@ import time
import json
import math
import drgn
from drgn import container_of
from drgn.helpers.linux.list import list_for_each_entry,list_empty
from drgn.helpers.linux.radixtree import radix_tree_for_each,radix_tree_lookup
import argparse
parser = argparse.ArgumentParser(description=desc,
formatter_class=argparse.RawTextHelpFormatter)
@ -34,6 +29,11 @@ parser.add_argument('--json', action='store_true',
help='Output in json')
args = parser.parse_args()
import drgn
from drgn import container_of
from drgn.helpers.linux.list import list_for_each_entry,list_empty
from drgn.helpers.linux.radixtree import radix_tree_for_each,radix_tree_lookup
def err(s):
print(s, file=sys.stderr, flush=True)
sys.exit(1)