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Wed, 20 Mar 2024 10:06:06 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org, tj@kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: willy@infradead.org, bfoster@redhat.com, jack@suse.cz, dsterba@suse.com, mjguzik@gmail.com, dhowells@redhat.com, peterz@infradead.org Subject: [PATCH 4/6] writeback: add wb_monitor.py script to monitor writeback info on bdi Date: Wed, 20 Mar 2024 19:02:20 +0800 Message-Id: <20240320110222.6564-5-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20240320110222.6564-1-shikemeng@huaweicloud.com> References: <20240320110222.6564-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: _Ch0CgAHFZ2KRPplVj2CHQ--.18626S6 X-Coremail-Antispam: 1UD129KBjvJXoW3Gw4Dur4rGF1fZFWxZw1rtFb_yoW7AFyDpF sYywnxAr1xZa4xJrn5ua40yryrCFs5Cr17XrZrArWaka15Wa4SyryrCFyUAry3GryDA39x XrWj93y0gayjgFJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPmb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAv FVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3w A2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE 3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr2 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv 67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7 CjxVA2Y2ka0xkIwI1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2Iq xVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r 1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY 6xkF7I0E14v26F4j6r4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aV AFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZE Xa7IU0TqcUUUUUU== X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Rspamd-Queue-Id: 8AAB940007 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: pr6e6yb5fbrreixd4ewuw9cwxza3mnox X-HE-Tag: 1710900370-143888 X-HE-Meta: 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 dKSTaQpT fYnb3sg8bctuEUzkbcVVBmHWfION8RG0vkCCtHLhZAiAk/e7KoqXbLuonIQKxptx5OGj4PGV1VNOlQNLT5GmfeE1jB4XC+ntn0/kYd/u4EdTxbt6IEwxa9Gr2BUe/6XI4eQ1lGjHtmQVLwJVDJwUvLsHhROMHpoeAmFst8ckn/jbKfWzRyKNQY9erLKleu1moxrAYNvvFklHr3VPoCrhdtjK1C6NgrqkZ5tey7RGMLJAYVMB3mxqTSwRjh2vlSXIyVhvehq9iRZ//VMGEZb3NDVC8I2wvcGfW+Ymf3nNebib72ZiO+v9ZWAtVSjoQBjaruWrVrtQlMsyu4O/SwTnVnjXKJ7gs3unkI+NW2fbq9aJfzkkqlvNpf/9qAZm2Gg3Lipfh X-Bogosity: Ham, tests=bogofilter, spamicity=0.000320, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add wb_monitor.py script to monitor writeback information on backing dev which makes it easier and more convenient to observe writeback behaviors of running system. This script is based on copy of wq_monitor.py. Signed-off-by: Kemeng Shi Suggested-by: Tejun Heo --- tools/writeback/wb_monitor.py | 172 ++++++++++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) create mode 100644 tools/writeback/wb_monitor.py diff --git a/tools/writeback/wb_monitor.py b/tools/writeback/wb_monitor.py new file mode 100644 index 000000000000..5e3591f1f9a9 --- /dev/null +++ b/tools/writeback/wb_monitor.py @@ -0,0 +1,172 @@ +#!/usr/bin/env drgn +# +# Copyright (C) 2024 Kemeng Shi +# Copyright (C) 2024 Huawei Inc + +desc = """ +This is a drgn script based on wq_monitor.py to monitor writeback info on +backing 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 signal +import re +import time +import json + +import drgn +from drgn.helpers.linux.list import list_for_each_entry + +import argparse +parser = 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()