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blkcg: add tools/cgroup/iocost_monitor.py
Instead of mucking with debugfs and ->pd_stat(), add drgn based monitoring script. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
Jens Axboe
parent
7caa47151a
commit
6954ff185e
@ -149,6 +149,27 @@
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* donate and should take back how much requires hweight propagations
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* anyway making it easier to implement and understand as a separate
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* mechanism.
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*
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* 3. Monitoring
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*
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* Instead of debugfs or other clumsy monitoring mechanisms, this
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* controller uses a drgn based monitoring script -
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* tools/cgroup/iocost_monitor.py. For details on drgn, please see
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* https://github.com/osandov/drgn. The ouput looks like the following.
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*
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* sdb RUN per=300ms cur_per=234.218:v203.695 busy= +1 vrate= 62.12%
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* active weight hweight% inflt% del_ms usages%
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* test/a * 50/ 50 33.33/ 33.33 27.65 0*041 033:033:033
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* test/b * 100/ 100 66.67/ 66.67 17.56 0*000 066:079:077
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*
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* - per : Timer period
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* - cur_per : Internal wall and device vtime clock
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* - vrate : Device virtual time rate against wall clock
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* - weight : Surplus-adjusted and configured weights
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* - hweight : Surplus-adjusted and configured hierarchical weights
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* - inflt : The percentage of in-flight IO cost at the end of last period
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* - del_ms : Deferred issuer delay induction level and duration
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* - usages : Usage history
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*/
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#include <linux/kernel.h>
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270
tools/cgroup/iocost_monitor.py
Normal file
270
tools/cgroup/iocost_monitor.py
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@ -0,0 +1,270 @@
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#!/usr/bin/env drgn
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#
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# Copyright (C) 2019 Tejun Heo <tj@kernel.org>
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# Copyright (C) 2019 Facebook
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desc = """
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This is a drgn script to monitor the blk-iocost cgroup controller.
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See the comment at the top of block/blk-iocost.c for more details.
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For drgn, visit https://github.com/osandov/drgn.
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"""
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import sys
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import re
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import time
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import json
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import drgn
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from drgn import container_of
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from drgn.helpers.linux.list import list_for_each_entry,list_empty
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from drgn.helpers.linux.radixtree import radix_tree_for_each,radix_tree_lookup
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import argparse
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parser = argparse.ArgumentParser(description=desc,
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formatter_class=argparse.RawTextHelpFormatter)
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parser.add_argument('devname', metavar='DEV',
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help='Target block device name (e.g. sda)')
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parser.add_argument('--cgroup', action='append', metavar='REGEX',
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help='Regex for target cgroups, ')
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parser.add_argument('--interval', '-i', metavar='SECONDS', type=float, default=1,
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help='Monitoring interval in seconds')
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parser.add_argument('--json', action='store_true',
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help='Output in json')
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args = parser.parse_args()
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def err(s):
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print(s, file=sys.stderr, flush=True)
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sys.exit(1)
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try:
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blkcg_root = prog['blkcg_root']
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plid = prog['blkcg_policy_iocost'].plid.value_()
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except:
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err('The kernel does not have iocost enabled')
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IOC_RUNNING = prog['IOC_RUNNING'].value_()
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NR_USAGE_SLOTS = prog['NR_USAGE_SLOTS'].value_()
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HWEIGHT_WHOLE = prog['HWEIGHT_WHOLE'].value_()
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VTIME_PER_SEC = prog['VTIME_PER_SEC'].value_()
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VTIME_PER_USEC = prog['VTIME_PER_USEC'].value_()
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AUTOP_SSD_FAST = prog['AUTOP_SSD_FAST'].value_()
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AUTOP_SSD_DFL = prog['AUTOP_SSD_DFL'].value_()
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AUTOP_SSD_QD1 = prog['AUTOP_SSD_QD1'].value_()
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AUTOP_HDD = prog['AUTOP_HDD'].value_()
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autop_names = {
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AUTOP_SSD_FAST: 'ssd_fast',
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AUTOP_SSD_DFL: 'ssd_dfl',
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AUTOP_SSD_QD1: 'ssd_qd1',
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AUTOP_HDD: 'hdd',
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}
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class BlkgIterator:
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def blkcg_name(blkcg):
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return blkcg.css.cgroup.kn.name.string_().decode('utf-8')
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def walk(self, blkcg, q_id, parent_path):
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if not self.include_dying and \
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not (blkcg.css.flags.value_() & prog['CSS_ONLINE'].value_()):
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return
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name = BlkgIterator.blkcg_name(blkcg)
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path = parent_path + '/' + name if parent_path else name
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blkg = drgn.Object(prog, 'struct blkcg_gq',
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address=radix_tree_lookup(blkcg.blkg_tree, q_id))
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if not blkg.address_:
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return
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self.blkgs.append((path if path else '/', blkg))
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for c in list_for_each_entry('struct blkcg',
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blkcg.css.children.address_of_(), 'css.sibling'):
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self.walk(c, q_id, path)
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def __init__(self, root_blkcg, q_id, include_dying=False):
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self.include_dying = include_dying
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self.blkgs = []
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self.walk(root_blkcg, q_id, '')
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def __iter__(self):
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return iter(self.blkgs)
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class IocStat:
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def __init__(self, ioc):
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global autop_names
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self.enabled = ioc.enabled.value_()
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self.running = ioc.running.value_() == IOC_RUNNING
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self.period_ms = round(ioc.period_us.value_() / 1_000)
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self.period_at = ioc.period_at.value_() / 1_000_000
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self.vperiod_at = ioc.period_at_vtime.value_() / VTIME_PER_SEC
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self.vrate_pct = ioc.vtime_rate.counter.value_() * 100 / VTIME_PER_USEC
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self.busy_level = ioc.busy_level.value_()
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self.autop_idx = ioc.autop_idx.value_()
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self.user_cost_model = ioc.user_cost_model.value_()
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self.user_qos_params = ioc.user_qos_params.value_()
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if self.autop_idx in autop_names:
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self.autop_name = autop_names[self.autop_idx]
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else:
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self.autop_name = '?'
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def dict(self, now):
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return { 'device' : devname,
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'timestamp' : now,
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'enabled' : self.enabled,
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'running' : self.running,
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'period_ms' : self.period_ms,
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'period_at' : self.period_at,
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'period_vtime_at' : self.vperiod_at,
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'busy_level' : self.busy_level,
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'vrate_pct' : self.vrate_pct, }
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def table_preamble_str(self):
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state = ('RUN' if self.running else 'IDLE') if self.enabled else 'OFF'
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output = f'{devname} {state:4} ' \
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f'per={self.period_ms}ms ' \
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f'cur_per={self.period_at:.3f}:v{self.vperiod_at:.3f} ' \
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f'busy={self.busy_level:+3} ' \
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f'vrate={self.vrate_pct:6.2f}% ' \
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f'params={self.autop_name}'
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if self.user_cost_model or self.user_qos_params:
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output += f'({"C" if self.user_cost_model else ""}{"Q" if self.user_qos_params else ""})'
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return output
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def table_header_str(self):
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return f'{"":25} active {"weight":>9} {"hweight%":>13} {"inflt%":>6} ' \
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f'{"del_ms":>6} {"usages%"}'
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class IocgStat:
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def __init__(self, iocg):
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ioc = iocg.ioc
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blkg = iocg.pd.blkg
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self.is_active = not list_empty(iocg.active_list.address_of_())
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self.weight = iocg.weight.value_()
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self.active = iocg.active.value_()
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self.inuse = iocg.inuse.value_()
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self.hwa_pct = iocg.hweight_active.value_() * 100 / HWEIGHT_WHOLE
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self.hwi_pct = iocg.hweight_inuse.value_() * 100 / HWEIGHT_WHOLE
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vdone = iocg.done_vtime.counter.value_()
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vtime = iocg.vtime.counter.value_()
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vrate = ioc.vtime_rate.counter.value_()
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period_vtime = ioc.period_us.value_() * vrate
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if period_vtime:
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self.inflight_pct = (vtime - vdone) * 100 / period_vtime
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else:
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self.inflight_pct = 0
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self.use_delay = min(blkg.use_delay.counter.value_(), 99)
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self.delay_ms = min(round(blkg.delay_nsec.counter.value_() / 1_000_000), 999)
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usage_idx = iocg.usage_idx.value_()
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self.usages = []
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self.usage = 0
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for i in range(NR_USAGE_SLOTS):
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usage = iocg.usages[(usage_idx + i) % NR_USAGE_SLOTS].value_()
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upct = min(usage * 100 / HWEIGHT_WHOLE, 999)
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self.usages.append(upct)
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self.usage = max(self.usage, upct)
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def dict(self, now, path):
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out = { 'cgroup' : path,
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'timestamp' : now,
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'is_active' : self.is_active,
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'weight' : self.weight,
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'weight_active' : self.active,
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'weight_inuse' : self.inuse,
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'hweight_active_pct' : self.hwa_pct,
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'hweight_inuse_pct' : self.hwi_pct,
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'inflight_pct' : self.inflight_pct,
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'use_delay' : self.use_delay,
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'delay_ms' : self.delay_ms,
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'usage_pct' : self.usage }
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for i in range(len(self.usages)):
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out[f'usage_pct_{i}'] = f'{self.usages[i]}'
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return out
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def table_row_str(self, path):
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out = f'{path[-28:]:28} ' \
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f'{"*" if self.is_active else " "} ' \
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f'{self.inuse:5}/{self.active:5} ' \
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f'{self.hwi_pct:6.2f}/{self.hwa_pct:6.2f} ' \
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f'{self.inflight_pct:6.2f} ' \
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f'{self.use_delay:2}*{self.delay_ms:03} '
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for u in self.usages:
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out += f'{round(u):03d}:'
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out = out.rstrip(':')
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return out
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# handle args
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table_fmt = not args.json
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interval = args.interval
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devname = args.devname
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if args.json:
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table_fmt = False
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re_str = None
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if args.cgroup:
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for r in args.cgroup:
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if re_str is None:
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re_str = r
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else:
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re_str += '|' + r
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filter_re = re.compile(re_str) if re_str else None
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# Locate the roots
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q_id = None
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root_iocg = None
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ioc = None
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for i, ptr in radix_tree_for_each(blkcg_root.blkg_tree):
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blkg = drgn.Object(prog, 'struct blkcg_gq', address=ptr)
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try:
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if devname == blkg.q.kobj.parent.name.string_().decode('utf-8'):
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q_id = blkg.q.id.value_()
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if blkg.pd[plid]:
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root_iocg = container_of(blkg.pd[plid], 'struct ioc_gq', 'pd')
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ioc = root_iocg.ioc
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break
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except:
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pass
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if ioc is None:
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err(f'Could not find ioc for {devname}');
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# Keep printing
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while True:
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now = time.time()
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iocstat = IocStat(ioc)
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output = ''
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if table_fmt:
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output += '\n' + iocstat.table_preamble_str()
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output += '\n' + iocstat.table_header_str()
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else:
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output += json.dumps(iocstat.dict(now))
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for path, blkg in BlkgIterator(blkcg_root, q_id):
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if filter_re and not filter_re.match(path):
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continue
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if not blkg.pd[plid]:
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continue
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iocg = container_of(blkg.pd[plid], 'struct ioc_gq', 'pd')
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iocg_stat = IocgStat(iocg)
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if not filter_re and not iocg_stat.is_active:
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continue
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if table_fmt:
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output += '\n' + iocg_stat.table_row_str(path)
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else:
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output += '\n' + json.dumps(iocg_stat.dict(now, path))
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print(output)
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sys.stdout.flush()
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time.sleep(interval)
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