linux-kernel - Re: [PATCH -next] block: update io

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Date:   Wed, 16 Feb 2022 19:48:17 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Zhang Wensheng <zhangwensheng5@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH -next] block: update io_ticks when io hang

On Tue, 25 Jan 2022 17:19:38 +0800, Zhang Wensheng wrote:
> When the inflight IOs are slow and no new IOs are issued, we expect
> iostat could manifest the IO hang problem. However after
> commit 5b18b5a73760 ("block: delete part_round_stats and switch to less
> precise counting"), io_tick and time_in_queue will not be updated until
> the end of IO, and the avgqu-sz and %util columns of iostat will be zero.
> 
> Because it has using stat.nsecs accumulation to express time_in_queue
> which is not suitable to change, and may %util will express the status
> better when io hang occur. To fix io_ticks, we use update_io_ticks and
> inflight to update io_ticks when diskstats_show and part_stat_show
> been called.
> 
> [...]

Applied, thanks!

[1/1] block: update io_ticks when io hang
      commit: 62847731488f59971413484005a7fb2772cb9249

Best regards,
-- 
Jens Axboe