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Mon, 22 Apr 2024 15:10:14 +0800 (CST) From: Kemeng Shi To: akpm@linux-foundation.org, willy@infradead.org, jack@suse.cz, bfoster@redhat.com, tj@kernel.org Cc: dsterba@suse.com, mjguzik@gmail.com, dhowells@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [ATCH v3 3/4] writeback: add wb_monitor.py script to monitor writeback info on bdi Date: Tue, 23 Apr 2024 00:05:38 +0800 Message-Id: <20240422160539.3340-4-shikemeng@huaweicloud.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20240422160539.3340-1-shikemeng@huaweicloud.com> References: <20240422160539.3340-1-shikemeng@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: Syh0CgAHdwpTDSZmt5eIKw--.7343S5 X-Coremail-Antispam: 1UD129KBjvJXoW3Xr1UCrWrWFWxXw1DJFy7Jrb_yoWxJr1fpF s8Aw13Ar1xZa4xJrnY9a40vry5Cws5Cr17XrW7ArWakan8Wa4FyryrCFyUAry3Cr9rJ39x X3ya93y8KFWjgFJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPab4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M280x2IEY4vEnII2IxkI6r1a6r45M2 8IrcIa0xkI8VA2jI8067AKxVWUWwA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK 0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4 x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l 84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I 8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AK xVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxV A2Y2ka0xkIwI1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r 43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF 7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV WUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU Iq2MUUUUU X-CM-SenderInfo: 5vklyvpphqwq5kxd4v5lfo033gof0z/ X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 615D7180018 X-Stat-Signature: yyk4cx5kwafgrsdo3f3ndut6h79ihjyd X-Rspam-User: X-HE-Tag: 1713769819-547714 X-HE-Meta: U2FsdGVkX1+DGQxAmDsaUfkCUDDaUlaAFocPa+Sdys6C2d0JUSTn5r0vf/EBKDd8KDYfuNVZG20foBMvNNZISOmNQ/lK7ID6y4eHpLP1AGMSbQNacp2/McC43m573REZAPX/O6A4mEI31WrmBS955mjaCnzX8I5Z7bRSzvt7ShDvVEIknZZZAVEHoryoR9SzQl5pzxEqTUXNmi136z0I6dS26T8LXmoyopDyNpsFSayinOnnf26GcWQ46+G+G0zYZEquvnRMZkJE7qfGsg9FmHXBgKArguPdDlBaKLU8m/hpQjK7oN+WrlxDeNB74bi+Bzm7x5HO2UTspLFs2fu6KAit+VU1tlf2maoWCMrOXpsU9QqXyTfVSKhSSJT2GMlqSdrnLzsBAI4KgWG90o6VkhKo2y9uRpmLjsh8b8gzJFYQLJ72BBTWZMeuXvf+pAh0fVIhjYErDBZvdUNsVuvbKwCZP5Xl9Pa1Y57ZVvdtQwCXC9+bU0uvbc04asU1QZE8dXG25nKNQu1XVmsSWioL8Rd2f7KdfiuO4BZ+nU5s9zKpSwoiTjfNwemMVMv36FbAs6JqhxGo3cNdlNBZwcLZvfYPccQiD2SyvP4jW62IkcnImxwBt66uAZj6ZQqsHmMJBy2df5GYpb4cC7aWYGCdA2Z4Tmd/idb2eYXZNI8ZHS53AMND2YkGhCLwCXh93zCkUQzm0rCiwloHkKD32WQq8RhjGGavRKqXrhQoRmKmlo19uNm5ZyrjKlUWnM0fkBwD2b7XqktJKzSb7JJxR7rSBTkSs5dkjC3wKDfE0LVa7l7rUYsBAZnMwa6aMH1JBADIGcwnNT/GlMPF58eJjxbVvfbi5GDlVK2nJs44Wj6lYyORBFNouILXoy+DSdRfgf8o5wNeXGs2v/Bs4e/sedLdlxgqk+OzbVsN/7iN4cgl7dEAnCZkjbbiGMSP5lfdLR3MMeLIgeUfXU6XP++19Hq xsCxGox5 KLaHKAQ1UUeaZBxLOXK9uSG19c4Kqzojab7eEj+vu7F3/ReuDXsrLREQV7UI8Tw578ltrJoKPEACZbUbSIBIBlrxKDTCTvWPadyd56Tl/wSmZ1WN4/SzsMhC0AibOtkzUu9L4co2Tu/oIcxaL8Y9497FDpUszOFov/nHWuPPQ2kc5aY5GeSK3QBGFxxm4uCPz+KZhdaZmoRc8aH50EXCXXJyXkP8roh1Bq57LTgIfkWHYJSVAHbCBP6A1wWwWG+UeJat+mgSmRaEWEaWoRbpZHLPmdkE2/DJnyeuZaGFJ4KGgPYJZlLXgLxLm7lWSYf0CnpvOad0wZr216ylfPIcOG7LzUZMjiqfIuDT8Nqjs3rLfcZAtrb+DYORt0C4KhoEHoZZ3 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000146, 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. The wb_monitor.py script is written based on wq_monitor.py. Following domain hierarchy is tested: global domain (320G) / \ cgroup domain1(10G) cgroup domain2(10G) | | bdi wb1 wb2 The wb_monitor.py script output is as following: ./wb_monitor.py 252:16 -c writeback reclaimable dirtied written avg_bw 252:16_1 0 0 0 0 102400 252:16_4284 672 820064 9230368 8410304 685612 252:16_4325 896 819840 10491264 9671648 652348 252:16 1568 1639904 19721632 18081952 1440360 writeback reclaimable dirtied written avg_bw 252:16_1 0 0 0 0 102400 252:16_4284 672 820064 9230368 8410304 685612 252:16_4325 896 819840 10491264 9671648 652348 252:16 1568 1639904 19721632 18081952 1440360 ... 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()