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#!/usr/bin/env drgn
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2025 Juri Lelli <juri.lelli@redhat.com>
# Copyright (C) 2025 Red Hat, Inc.
desc = """
This is a drgn script to show dl_rq bandwidth accounting information. For more
info on drgn, visit https://github.com/osandov/drgn.
Only online CPUs are reported.
"""
import os
import argparse
import drgn
from drgn import FaultError
from drgn.helpers.common import *
from drgn.helpers.linux import *
def print_dl_bws_info():
print("Retrieving dl_rq bandwidth accounting information:")
runqueues = prog['runqueues']
for cpu_id in for_each_possible_cpu(prog):
try:
rq = per_cpu(runqueues, cpu_id)
if rq.online == 0:
continue
dl_rq = rq.dl
print(f" From CPU: {cpu_id}")
# Access and print relevant fields from struct dl_rq
print(f" running_bw : {dl_rq.running_bw}")
print(f" this_bw : {dl_rq.this_bw}")
print(f" extra_bw : {dl_rq.extra_bw}")
print(f" max_bw : {dl_rq.max_bw}")
print(f" bw_ratio : {dl_rq.bw_ratio}")
except drgn.FaultError as fe:
print(f" (CPU {cpu_id}: Fault accessing kernel memory: {fe})")
except AttributeError as ae:
print(f" (CPU {cpu_id}: Missing attribute for root_domain (kernel struct change?): {ae})")
except Exception as e:
print(f" (CPU {cpu_id}: An unexpected error occurred: {e})")
if __name__ == "__main__":
parser = argparse.ArgumentParser(description=desc,
formatter_class=argparse.RawTextHelpFormatter)
args = parser.parse_args()
print_dl_bws_info()
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