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634c24068a
dl_rq bandwidth accounting information is crucial for the correct functioning of SCHED_DEADLINE. Add a drgn script for accessing that information at runtime, so that it's easier to check and debug issues related to it. Signed-off-by: Juri Lelli <juri.lelli@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Marcel Ziswiler <marcel.ziswiler@codethink.co.uk> # nuc & rock5b Link: https://lore.kernel.org/r/20250627115118.438797-6-juri.lelli@redhat.com
57 lines
1.7 KiB
Python
57 lines
1.7 KiB
Python
#!/usr/bin/env drgn
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2025 Juri Lelli <juri.lelli@redhat.com>
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# Copyright (C) 2025 Red Hat, Inc.
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desc = """
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This is a drgn script to show dl_rq bandwidth accounting information. For more
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info on drgn, visit https://github.com/osandov/drgn.
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Only online CPUs are reported.
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"""
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import os
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import argparse
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import drgn
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from drgn import FaultError
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from drgn.helpers.common import *
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from drgn.helpers.linux import *
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def print_dl_bws_info():
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print("Retrieving dl_rq bandwidth accounting information:")
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runqueues = prog['runqueues']
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for cpu_id in for_each_possible_cpu(prog):
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try:
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rq = per_cpu(runqueues, cpu_id)
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if rq.online == 0:
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continue
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dl_rq = rq.dl
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print(f" From CPU: {cpu_id}")
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# Access and print relevant fields from struct dl_rq
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print(f" running_bw : {dl_rq.running_bw}")
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print(f" this_bw : {dl_rq.this_bw}")
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print(f" extra_bw : {dl_rq.extra_bw}")
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print(f" max_bw : {dl_rq.max_bw}")
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print(f" bw_ratio : {dl_rq.bw_ratio}")
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except drgn.FaultError as fe:
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print(f" (CPU {cpu_id}: Fault accessing kernel memory: {fe})")
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except AttributeError as ae:
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print(f" (CPU {cpu_id}: Missing attribute for root_domain (kernel struct change?): {ae})")
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except Exception as e:
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print(f" (CPU {cpu_id}: An unexpected error occurred: {e})")
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description=desc,
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formatter_class=argparse.RawTextHelpFormatter)
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args = parser.parse_args()
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print_dl_bws_info()
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