283 lines
9.8 KiB
Python
283 lines
9.8 KiB
Python
#!/usr/bin/env drgn
|
|
#
|
|
# Copyright (C) 2019 Tejun Heo <tj@kernel.org>
|
|
# Copyright (C) 2019 Facebook
|
|
|
|
desc = """
|
|
This is a drgn script to monitor the blk-iocost cgroup controller.
|
|
See the comment at the top of block/blk-iocost.c for more details.
|
|
For drgn, visit https://github.com/osandov/drgn.
|
|
"""
|
|
|
|
import sys
|
|
import re
|
|
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)
|
|
parser.add_argument('devname', metavar='DEV',
|
|
help='Target block device name (e.g. sda)')
|
|
parser.add_argument('--cgroup', action='append', metavar='REGEX',
|
|
help='Regex for target cgroups, ')
|
|
parser.add_argument('--interval', '-i', metavar='SECONDS', type=float, default=1,
|
|
help='Monitoring interval in seconds')
|
|
parser.add_argument('--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)
|
|
|
|
try:
|
|
blkcg_root = prog['blkcg_root']
|
|
plid = prog['blkcg_policy_iocost'].plid.value_()
|
|
except:
|
|
err('The kernel does not have iocost enabled')
|
|
|
|
IOC_RUNNING = prog['IOC_RUNNING'].value_()
|
|
NR_USAGE_SLOTS = prog['NR_USAGE_SLOTS'].value_()
|
|
HWEIGHT_WHOLE = prog['HWEIGHT_WHOLE'].value_()
|
|
VTIME_PER_SEC = prog['VTIME_PER_SEC'].value_()
|
|
VTIME_PER_USEC = prog['VTIME_PER_USEC'].value_()
|
|
AUTOP_SSD_FAST = prog['AUTOP_SSD_FAST'].value_()
|
|
AUTOP_SSD_DFL = prog['AUTOP_SSD_DFL'].value_()
|
|
AUTOP_SSD_QD1 = prog['AUTOP_SSD_QD1'].value_()
|
|
AUTOP_HDD = prog['AUTOP_HDD'].value_()
|
|
|
|
autop_names = {
|
|
AUTOP_SSD_FAST: 'ssd_fast',
|
|
AUTOP_SSD_DFL: 'ssd_dfl',
|
|
AUTOP_SSD_QD1: 'ssd_qd1',
|
|
AUTOP_HDD: 'hdd',
|
|
}
|
|
|
|
class BlkgIterator:
|
|
def blkcg_name(blkcg):
|
|
return blkcg.css.cgroup.kn.name.string_().decode('utf-8')
|
|
|
|
def walk(self, blkcg, q_id, parent_path):
|
|
if not self.include_dying and \
|
|
not (blkcg.css.flags.value_() & prog['CSS_ONLINE'].value_()):
|
|
return
|
|
|
|
name = BlkgIterator.blkcg_name(blkcg)
|
|
path = parent_path + '/' + name if parent_path else name
|
|
blkg = drgn.Object(prog, 'struct blkcg_gq',
|
|
address=radix_tree_lookup(blkcg.blkg_tree.address_of_(), q_id))
|
|
if not blkg.address_:
|
|
return
|
|
|
|
self.blkgs.append((path if path else '/', blkg))
|
|
|
|
for c in list_for_each_entry('struct blkcg',
|
|
blkcg.css.children.address_of_(), 'css.sibling'):
|
|
self.walk(c, q_id, path)
|
|
|
|
def __init__(self, root_blkcg, q_id, include_dying=False):
|
|
self.include_dying = include_dying
|
|
self.blkgs = []
|
|
self.walk(root_blkcg, q_id, '')
|
|
|
|
def __iter__(self):
|
|
return iter(self.blkgs)
|
|
|
|
class IocStat:
|
|
def __init__(self, ioc):
|
|
global autop_names
|
|
|
|
self.enabled = ioc.enabled.value_()
|
|
self.running = ioc.running.value_() == IOC_RUNNING
|
|
self.period_ms = ioc.period_us.value_() / 1_000
|
|
self.period_at = ioc.period_at.value_() / 1_000_000
|
|
self.vperiod_at = ioc.period_at_vtime.value_() / VTIME_PER_SEC
|
|
self.vrate_pct = ioc.vtime_rate.counter.value_() * 100 / VTIME_PER_USEC
|
|
self.busy_level = ioc.busy_level.value_()
|
|
self.autop_idx = ioc.autop_idx.value_()
|
|
self.user_cost_model = ioc.user_cost_model.value_()
|
|
self.user_qos_params = ioc.user_qos_params.value_()
|
|
|
|
if self.autop_idx in autop_names:
|
|
self.autop_name = autop_names[self.autop_idx]
|
|
else:
|
|
self.autop_name = '?'
|
|
|
|
def dict(self, now):
|
|
return { 'device' : devname,
|
|
'timestamp' : now,
|
|
'enabled' : self.enabled,
|
|
'running' : self.running,
|
|
'period_ms' : self.period_ms,
|
|
'period_at' : self.period_at,
|
|
'period_vtime_at' : self.vperiod_at,
|
|
'busy_level' : self.busy_level,
|
|
'vrate_pct' : self.vrate_pct, }
|
|
|
|
def table_preamble_str(self):
|
|
state = ('RUN' if self.running else 'IDLE') if self.enabled else 'OFF'
|
|
output = f'{devname} {state:4} ' \
|
|
f'per={self.period_ms}ms ' \
|
|
f'cur_per={self.period_at:.3f}:v{self.vperiod_at:.3f} ' \
|
|
f'busy={self.busy_level:+3} ' \
|
|
f'vrate={self.vrate_pct:6.2f}% ' \
|
|
f'params={self.autop_name}'
|
|
if self.user_cost_model or self.user_qos_params:
|
|
output += f'({"C" if self.user_cost_model else ""}{"Q" if self.user_qos_params else ""})'
|
|
return output
|
|
|
|
def table_header_str(self):
|
|
return f'{"":25} active {"weight":>9} {"hweight%":>13} {"inflt%":>6} ' \
|
|
f'{"dbt":>3} {"delay":>6} {"usages%"}'
|
|
|
|
class IocgStat:
|
|
def __init__(self, iocg):
|
|
ioc = iocg.ioc
|
|
blkg = iocg.pd.blkg
|
|
|
|
self.is_active = not list_empty(iocg.active_list.address_of_())
|
|
self.weight = iocg.weight.value_()
|
|
self.active = iocg.active.value_()
|
|
self.inuse = iocg.inuse.value_()
|
|
self.hwa_pct = iocg.hweight_active.value_() * 100 / HWEIGHT_WHOLE
|
|
self.hwi_pct = iocg.hweight_inuse.value_() * 100 / HWEIGHT_WHOLE
|
|
self.address = iocg.value_()
|
|
|
|
vdone = iocg.done_vtime.counter.value_()
|
|
vtime = iocg.vtime.counter.value_()
|
|
vrate = ioc.vtime_rate.counter.value_()
|
|
period_vtime = ioc.period_us.value_() * vrate
|
|
if period_vtime:
|
|
self.inflight_pct = (vtime - vdone) * 100 / period_vtime
|
|
else:
|
|
self.inflight_pct = 0
|
|
|
|
# vdebt used to be an atomic64_t and is now u64, support both
|
|
try:
|
|
self.debt_ms = iocg.abs_vdebt.counter.value_() / VTIME_PER_USEC / 1000
|
|
except:
|
|
self.debt_ms = iocg.abs_vdebt.value_() / VTIME_PER_USEC / 1000
|
|
|
|
self.use_delay = blkg.use_delay.counter.value_()
|
|
self.delay_ms = blkg.delay_nsec.counter.value_() / 1_000_000
|
|
|
|
usage_idx = iocg.usage_idx.value_()
|
|
self.usages = []
|
|
self.usage = 0
|
|
for i in range(NR_USAGE_SLOTS):
|
|
usage = iocg.usages[(usage_idx + i) % NR_USAGE_SLOTS].value_()
|
|
upct = usage * 100 / HWEIGHT_WHOLE
|
|
self.usages.append(upct)
|
|
self.usage = max(self.usage, upct)
|
|
|
|
def dict(self, now, path):
|
|
out = { 'cgroup' : path,
|
|
'timestamp' : now,
|
|
'is_active' : self.is_active,
|
|
'weight' : self.weight,
|
|
'weight_active' : self.active,
|
|
'weight_inuse' : self.inuse,
|
|
'hweight_active_pct' : self.hwa_pct,
|
|
'hweight_inuse_pct' : self.hwi_pct,
|
|
'inflight_pct' : self.inflight_pct,
|
|
'debt_ms' : self.debt_ms,
|
|
'use_delay' : self.use_delay,
|
|
'delay_ms' : self.delay_ms,
|
|
'usage_pct' : self.usage,
|
|
'address' : self.address }
|
|
for i in range(len(self.usages)):
|
|
out[f'usage_pct_{i}'] = str(self.usages[i])
|
|
return out
|
|
|
|
def table_row_str(self, path):
|
|
out = f'{path[-28:]:28} ' \
|
|
f'{"*" if self.is_active else " "} ' \
|
|
f'{self.inuse:5}/{self.active:5} ' \
|
|
f'{self.hwi_pct:6.2f}/{self.hwa_pct:6.2f} ' \
|
|
f'{self.inflight_pct:6.2f} ' \
|
|
f'{min(math.ceil(self.debt_ms), 999):3} ' \
|
|
f'{min(self.use_delay, 99):2}*'\
|
|
f'{min(math.ceil(self.delay_ms), 999):03} '
|
|
for u in self.usages:
|
|
out += f'{min(round(u), 999):03d}:'
|
|
out = out.rstrip(':')
|
|
return out
|
|
|
|
# handle args
|
|
table_fmt = not args.json
|
|
interval = args.interval
|
|
devname = args.devname
|
|
|
|
if args.json:
|
|
table_fmt = False
|
|
|
|
re_str = None
|
|
if args.cgroup:
|
|
for r in args.cgroup:
|
|
if re_str is None:
|
|
re_str = r
|
|
else:
|
|
re_str += '|' + r
|
|
|
|
filter_re = re.compile(re_str) if re_str else None
|
|
|
|
# Locate the roots
|
|
q_id = None
|
|
root_iocg = None
|
|
ioc = None
|
|
|
|
for i, ptr in radix_tree_for_each(blkcg_root.blkg_tree.address_of_()):
|
|
blkg = drgn.Object(prog, 'struct blkcg_gq', address=ptr)
|
|
try:
|
|
if devname == blkg.q.kobj.parent.name.string_().decode('utf-8'):
|
|
q_id = blkg.q.id.value_()
|
|
if blkg.pd[plid]:
|
|
root_iocg = container_of(blkg.pd[plid], 'struct ioc_gq', 'pd')
|
|
ioc = root_iocg.ioc
|
|
break
|
|
except:
|
|
pass
|
|
|
|
if ioc is None:
|
|
err(f'Could not find ioc for {devname}');
|
|
|
|
# Keep printing
|
|
while True:
|
|
now = time.time()
|
|
iocstat = IocStat(ioc)
|
|
output = ''
|
|
|
|
if table_fmt:
|
|
output += '\n' + iocstat.table_preamble_str()
|
|
output += '\n' + iocstat.table_header_str()
|
|
else:
|
|
output += json.dumps(iocstat.dict(now))
|
|
|
|
for path, blkg in BlkgIterator(blkcg_root, q_id):
|
|
if filter_re and not filter_re.match(path):
|
|
continue
|
|
if not blkg.pd[plid]:
|
|
continue
|
|
|
|
iocg = container_of(blkg.pd[plid], 'struct ioc_gq', 'pd')
|
|
iocg_stat = IocgStat(iocg)
|
|
|
|
if not filter_re and not iocg_stat.is_active:
|
|
continue
|
|
|
|
if table_fmt:
|
|
output += '\n' + iocg_stat.table_row_str(path)
|
|
else:
|
|
output += '\n' + json.dumps(iocg_stat.dict(now, path))
|
|
|
|
print(output)
|
|
sys.stdout.flush()
|
|
time.sleep(interval)
|