linux-kernel - Re: [PATCH] block: fix false warning in bdev_count_inflight

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Message-ID: <bca70ea3-8f9c-b69e-0a39-0a0d91e7e353@huaweicloud.com>
Date: Thu, 26 Jun 2025 19:37:03 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: John Garry <john.g.garry@...cle.com>, Yu Kuai <yukuai1@...weicloud.com>,
 axboe@...nel.dk, hare@...e.de, hch@...radead.org
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 yi.zhang@...hat.com, calvin@...nvd.org, david@...morbit.com,
 yi.zhang@...wei.com, yangerkun@...wei.com, johnny.chenyi@...wei.com,
 "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] block: fix false warning in bdev_count_inflight_rw()

Hi,

在 2025/06/26 17:34, John Garry 写道:
> Is it even safe to even use this function when not used for just 
> informative purposes? I mean, for example, it is used by md code to 
> check for idle state - could that check return an invalid result (and 
> cause harm)?

For md code, I think it's ok, md still use completed IO for idle state.

More importantly, the io_ticks can be wrong due to inflight to be zero,
however, it's inaccurate for a long time and there is no much we can do
:(

Thanks,
Kuai