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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173#!/usr/bin/env drgn## Copyright (C) 2024 Kemeng Shi <shikemeng@huaweicloud.com># Copyright (C) 2024 Huawei Inc
desc = """This is a drgn script based on wq_monitor.py to monitor writeback info onbacking dev. For more info on drgn, visit https://github.com/osandov/drgn.
writeback(kB) Amount of dirty pages are currently being written back to disk.
reclaimable(kB) Amount of pages are currently reclaimable.
dirtied(kB) Amount of pages have been dirtied.
wrttien(kB) Amount of dirty pages have been written back to disk.
avg_wb(kBps) Smoothly estimated write bandwidth of writing dirty pages back to disk."""
import signalimport reimport timeimport json
import drgnfrom drgn.helpers.linux.list import list_for_each_entry
import argparseparser = argparse.ArgumentParser(description=desc, formatter_class=argparse.RawTextHelpFormatter)parser.add_argument('bdi', metavar='REGEX', nargs='*', help='Target backing device 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')parser.add_argument('-c', '--cgroup', action='store_true', help='show writeback of bdi in cgroup')args = parser.parse_args()
bdi_list = prog['bdi_list']
WB_RECLAIMABLE = prog['WB_RECLAIMABLE']WB_WRITEBACK = prog['WB_WRITEBACK']WB_DIRTIED = prog['WB_DIRTIED']WB_WRITTEN = prog['WB_WRITTEN']NR_WB_STAT_ITEMS = prog['NR_WB_STAT_ITEMS']
PAGE_SHIFT = prog['PAGE_SHIFT']
def K(x): return x << (PAGE_SHIFT - 10)
class Stats: def dict(self, now): return { 'timestamp' : now, 'name' : self.name, 'writeback' : self.stats[WB_WRITEBACK], 'reclaimable' : self.stats[WB_RECLAIMABLE], 'dirtied' : self.stats[WB_DIRTIED], 'written' : self.stats[WB_WRITTEN], 'avg_wb' : self.avg_bw, }
def table_header_str(): return f'{"":>16} {"writeback":>10} {"reclaimable":>12} ' \ f'{"dirtied":>9} {"written":>9} {"avg_bw":>9}'
def table_row_str(self): out = f'{self.name[-16:]:16} ' \ f'{self.stats[WB_WRITEBACK]:10} ' \ f'{self.stats[WB_RECLAIMABLE]:12} ' \ f'{self.stats[WB_DIRTIED]:9} ' \ f'{self.stats[WB_WRITTEN]:9} ' \ f'{self.avg_bw:9} ' return out
def show_header(): if Stats.table_fmt: print() print(Stats.table_header_str())
def show_stats(self): if Stats.table_fmt: print(self.table_row_str()) else: print(self.dict(Stats.now))
class WbStats(Stats): def __init__(self, wb): bdi_name = wb.bdi.dev_name.string_().decode() # avoid to use bdi.wb.memcg_css which is only defined when # CONFIG_CGROUP_WRITEBACK is enabled if wb == wb.bdi.wb.address_of_(): ino = "1" else: ino = str(wb.memcg_css.cgroup.kn.id.value_()) self.name = bdi_name + '_' + ino
self.stats = [0] * NR_WB_STAT_ITEMS for i in range(NR_WB_STAT_ITEMS): if wb.stat[i].count >= 0: self.stats[i] = int(K(wb.stat[i].count)) else: self.stats[i] = 0
self.avg_bw = int(K(wb.avg_write_bandwidth))
class BdiStats(Stats): def __init__(self, bdi): self.name = bdi.dev_name.string_().decode() self.stats = [0] * NR_WB_STAT_ITEMS self.avg_bw = 0
def collectStats(self, wb_stats): for i in range(NR_WB_STAT_ITEMS): self.stats[i] += wb_stats.stats[i]
self.avg_bw += wb_stats.avg_bw
exit_req = False
def sigint_handler(signr, frame): global exit_req exit_req = True
def main(): # handle args Stats.table_fmt = not args.json interval = args.interval cgroup = args.cgroup
re_str = None if args.bdi: for r in args.bdi: 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: Stats.now = time.time()
Stats.show_header() for bdi in list_for_each_entry('struct backing_dev_info', bdi_list.address_of_(), 'bdi_list'): bdi_stats = BdiStats(bdi) if filter_re and not filter_re.search(bdi_stats.name): continue
for wb in list_for_each_entry('struct bdi_writeback', bdi.wb_list.address_of_(), 'bdi_node'): wb_stats = WbStats(wb) bdi_stats.collectStats(wb_stats) if cgroup: wb_stats.show_stats()
bdi_stats.show_stats() if cgroup and Stats.table_fmt: print()
if interval == 0: break time.sleep(interval)
if __name__ == "__main__": main()