From: Keith Busch <kbusch@kernel.org>
To: Yu Kuai <yukuai3@huawei.com>
Cc: axboe@kernel.dk, ming.lei@redhat.com, jack@suse.cz,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
yi.zhang@huawei.com
Subject: Re: [PATCH RFC -next] sbitmap: fix possible io hung due to lost wakeups
Date: Fri, 17 Jun 2022 08:04:29 -0600 [thread overview]
Message-ID: <YqyJ7dwUB0z0puNc@kbusch-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20220617141125.3024491-1-yukuai3@huawei.com>
On Fri, Jun 17, 2022 at 10:11:25PM +0800, Yu Kuai wrote:
>
> What's worse, io hung is possible in theory because wakeups might be
> missed. For example, 2 * wake_batch tags are put, while only wake_batch
> threads are worken:
Not just in theory, io hanging sounds like the problem reported here:
https://bugzilla.kernel.org/show_bug.cgi?id=215679
I only knew that it had nothing to do with the nvme driver, though, but they
closed the bug after it stopped happening with different hardware.
next prev parent reply other threads:[~2022-06-17 14:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-17 14:11 [PATCH RFC -next] sbitmap: fix possible io hung due to lost wakeups Yu Kuai
2022-06-17 14:04 ` Keith Busch [this message]
2022-06-20 12:24 ` Jan Kara
2022-06-20 12:48 ` Jan Kara
2022-06-20 13:44 ` Yu Kuai
2022-06-20 17:02 ` Jan Kara
2022-06-22 3:58 ` Yu Kuai
2022-06-22 6:41 ` Yu Kuai
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