2023-05-18 11:02:08 +08:00
|
|
|
#!/usr/bin/env drgn
|
|
|
|
#
|
|
|
|
# Copyright (C) 2023 Tejun Heo <tj@kernel.org>
|
|
|
|
# Copyright (C) 2023 Meta Platforms, Inc. and affiliates.
|
|
|
|
|
|
|
|
desc = """
|
|
|
|
This is a drgn script to monitor workqueues. For more info on drgn, visit
|
|
|
|
https://github.com/osandov/drgn.
|
|
|
|
|
|
|
|
total Total number of work items executed by the workqueue.
|
|
|
|
|
|
|
|
infl The number of currently in-flight work items.
|
|
|
|
|
2023-05-18 11:02:08 +08:00
|
|
|
CPUitsv The number of times a concurrency-managed work item hogged CPU
|
|
|
|
longer than the threshold (workqueue.cpu_intensive_thresh_us)
|
|
|
|
and got excluded from concurrency management to avoid stalling
|
|
|
|
other work items.
|
|
|
|
|
2023-05-18 11:02:08 +08:00
|
|
|
CMwake The number of concurrency-management wake-ups while executing a
|
|
|
|
work item of the workqueue.
|
|
|
|
|
|
|
|
mayday The number of times the rescuer was requested while waiting for
|
|
|
|
new worker creation.
|
|
|
|
|
|
|
|
rescued The number of work items executed by the rescuer.
|
|
|
|
"""
|
|
|
|
|
|
|
|
import sys
|
|
|
|
import signal
|
|
|
|
import os
|
|
|
|
import re
|
|
|
|
import time
|
|
|
|
import json
|
|
|
|
|
|
|
|
import drgn
|
|
|
|
from drgn.helpers.linux.list import list_for_each_entry,list_empty
|
|
|
|
from drgn.helpers.linux.cpumask import for_each_possible_cpu
|
|
|
|
|
|
|
|
import argparse
|
|
|
|
parser = argparse.ArgumentParser(description=desc,
|
|
|
|
formatter_class=argparse.RawTextHelpFormatter)
|
|
|
|
parser.add_argument('workqueue', metavar='REGEX', nargs='*',
|
|
|
|
help='Target workqueue name patterns (all if empty)')
|
|
|
|
parser.add_argument('-i', '--interval', metavar='SECS', type=float, default=1,
|
|
|
|
help='Monitoring interval (0 to print once and exit)')
|
|
|
|
parser.add_argument('-j', '--json', action='store_true',
|
|
|
|
help='Output in json')
|
|
|
|
args = parser.parse_args()
|
|
|
|
|
|
|
|
def err(s):
|
|
|
|
print(s, file=sys.stderr, flush=True)
|
|
|
|
sys.exit(1)
|
|
|
|
|
|
|
|
workqueues = prog['workqueues']
|
|
|
|
|
|
|
|
WQ_UNBOUND = prog['WQ_UNBOUND']
|
|
|
|
WQ_MEM_RECLAIM = prog['WQ_MEM_RECLAIM']
|
|
|
|
|
|
|
|
PWQ_STAT_STARTED = prog['PWQ_STAT_STARTED'] # work items started execution
|
|
|
|
PWQ_STAT_COMPLETED = prog['PWQ_STAT_COMPLETED'] # work items completed execution
|
2023-05-18 11:02:08 +08:00
|
|
|
PWQ_STAT_CPU_INTENSIVE = prog['PWQ_STAT_CPU_INTENSIVE'] # wq_cpu_intensive_thresh_us violations
|
2023-05-18 11:02:08 +08:00
|
|
|
PWQ_STAT_CM_WAKEUP = prog['PWQ_STAT_CM_WAKEUP'] # concurrency-management worker wakeups
|
|
|
|
PWQ_STAT_MAYDAY = prog['PWQ_STAT_MAYDAY'] # maydays to rescuer
|
|
|
|
PWQ_STAT_RESCUED = prog['PWQ_STAT_RESCUED'] # linked work items executed by rescuer
|
|
|
|
PWQ_NR_STATS = prog['PWQ_NR_STATS']
|
|
|
|
|
|
|
|
class WqStats:
|
|
|
|
def __init__(self, wq):
|
|
|
|
self.name = wq.name.string_().decode()
|
|
|
|
self.unbound = wq.flags & WQ_UNBOUND != 0
|
|
|
|
self.mem_reclaim = wq.flags & WQ_MEM_RECLAIM != 0
|
|
|
|
self.stats = [0] * PWQ_NR_STATS
|
|
|
|
for pwq in list_for_each_entry('struct pool_workqueue', wq.pwqs.address_of_(), 'pwqs_node'):
|
|
|
|
for i in range(PWQ_NR_STATS):
|
|
|
|
self.stats[i] += int(pwq.stats[i])
|
|
|
|
|
|
|
|
def dict(self, now):
|
|
|
|
return { 'timestamp' : now,
|
|
|
|
'name' : self.name,
|
|
|
|
'unbound' : self.unbound,
|
|
|
|
'mem_reclaim' : self.mem_reclaim,
|
|
|
|
'started' : self.stats[PWQ_STAT_STARTED],
|
|
|
|
'completed' : self.stats[PWQ_STAT_COMPLETED],
|
2023-05-18 11:02:08 +08:00
|
|
|
'cpu_intensive' : self.stats[PWQ_STAT_CPU_INTENSIVE],
|
2023-05-18 11:02:08 +08:00
|
|
|
'cm_wakeup' : self.stats[PWQ_STAT_CM_WAKEUP],
|
|
|
|
'mayday' : self.stats[PWQ_STAT_MAYDAY],
|
|
|
|
'rescued' : self.stats[PWQ_STAT_RESCUED], }
|
|
|
|
|
|
|
|
def table_header_str():
|
2023-05-18 11:02:08 +08:00
|
|
|
return f'{"":>24} {"total":>8} {"infl":>5} '\
|
|
|
|
f'{"CPUitsv":>7} {"CMwake":>7} {"mayday":>7} {"rescued":>7}'
|
2023-05-18 11:02:08 +08:00
|
|
|
|
|
|
|
def table_row_str(self):
|
2023-05-18 11:02:08 +08:00
|
|
|
cpu_intensive = '-'
|
2023-05-18 11:02:08 +08:00
|
|
|
cm_wakeup = '-'
|
|
|
|
mayday = '-'
|
|
|
|
rescued = '-'
|
|
|
|
|
|
|
|
if not self.unbound:
|
2023-05-18 11:02:08 +08:00
|
|
|
cpu_intensive = str(self.stats[PWQ_STAT_CPU_INTENSIVE])
|
2023-05-18 11:02:08 +08:00
|
|
|
cm_wakeup = str(self.stats[PWQ_STAT_CM_WAKEUP])
|
|
|
|
|
|
|
|
if self.mem_reclaim:
|
|
|
|
mayday = str(self.stats[PWQ_STAT_MAYDAY])
|
|
|
|
rescued = str(self.stats[PWQ_STAT_RESCUED])
|
|
|
|
|
|
|
|
out = f'{self.name[-24:]:24} ' \
|
|
|
|
f'{self.stats[PWQ_STAT_STARTED]:8} ' \
|
|
|
|
f'{max(self.stats[PWQ_STAT_STARTED] - self.stats[PWQ_STAT_COMPLETED], 0):5} ' \
|
2023-05-18 11:02:08 +08:00
|
|
|
f'{cpu_intensive:>7} ' \
|
2023-05-18 11:02:08 +08:00
|
|
|
f'{cm_wakeup:>7} ' \
|
|
|
|
f'{mayday:>7} ' \
|
|
|
|
f'{rescued:>7} '
|
|
|
|
return out.rstrip(':')
|
|
|
|
|
|
|
|
exit_req = False
|
|
|
|
|
|
|
|
def sigint_handler(signr, frame):
|
|
|
|
global exit_req
|
|
|
|
exit_req = True
|
|
|
|
|
|
|
|
def main():
|
|
|
|
# handle args
|
|
|
|
table_fmt = not args.json
|
|
|
|
interval = args.interval
|
|
|
|
|
|
|
|
re_str = None
|
|
|
|
if args.workqueue:
|
|
|
|
for r in args.workqueue:
|
|
|
|
if re_str is None:
|
|
|
|
re_str = r
|
|
|
|
else:
|
|
|
|
re_str += '|' + r
|
|
|
|
|
|
|
|
filter_re = re.compile(re_str) if re_str else None
|
|
|
|
|
|
|
|
# monitoring loop
|
|
|
|
signal.signal(signal.SIGINT, sigint_handler)
|
|
|
|
|
|
|
|
while not exit_req:
|
|
|
|
now = time.time()
|
|
|
|
|
|
|
|
if table_fmt:
|
|
|
|
print()
|
|
|
|
print(WqStats.table_header_str())
|
|
|
|
|
|
|
|
for wq in list_for_each_entry('struct workqueue_struct', workqueues.address_of_(), 'list'):
|
|
|
|
stats = WqStats(wq)
|
|
|
|
if filter_re and not filter_re.search(stats.name):
|
|
|
|
continue
|
|
|
|
if table_fmt:
|
|
|
|
print(stats.table_row_str())
|
|
|
|
else:
|
|
|
|
print(stats.dict(now))
|
|
|
|
|
|
|
|
if interval == 0:
|
|
|
|
break
|
|
|
|
time.sleep(interval)
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
main()
|