From: Jens Axboe <axboe@kernel.dk>
To: Dylan Yudaken <dylany@fb.com>, io-uring@vger.kernel.org
Cc: asml.silence@gmail.com
Subject: Re: [PATCH] io_uring: fix bug in slow unregistering of nodes
Date: Sun, 23 Jan 2022 09:36:23 -0700 [thread overview]
Message-ID: <164295578348.5567.14720982094932596207.b4-ty@kernel.dk> (raw)
In-Reply-To: <20220121123856.3557884-1-dylany@fb.com>
On Fri, 21 Jan 2022 04:38:56 -0800, Dylan Yudaken wrote:
> In some cases io_rsrc_ref_quiesce will call io_rsrc_node_switch_start,
> and then immediately flush the delayed work queue &ctx->rsrc_put_work.
>
> However the percpu_ref_put does not immediately destroy the node, it
> will be called asynchronously via RCU. That ends up with
> io_rsrc_node_ref_zero only being called after rsrc_put_work has been
> flushed, and so the process ends up sleeping for 1 second unnecessarily.
>
> [...]
Applied, thanks!
[1/1] io_uring: fix bug in slow unregistering of nodes
(no commit info)
Best regards,
--
Jens Axboe
prev parent reply other threads:[~2022-01-23 16:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-21 12:38 [PATCH] io_uring: fix bug in slow unregistering of nodes Dylan Yudaken
2022-01-21 20:23 ` Jens Axboe
2022-01-23 16:36 ` Jens Axboe [this message]
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