linux-kernel - Re: [PATCH v7 7/8] selftests: ublk: add test for per io daemons

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Message-ID: <aDgtTqj-s_SN7wCK@fedora>
Date: Thu, 29 May 2025 17:47:58 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Uday Shankar <ushankar@...estorage.com>
Cc: Jens Axboe <axboe@...nel.dk>,
	Caleb Sander Mateos <csander@...estorage.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuah@...nel.org>, Jonathan Corbet <corbet@....net>,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v7 7/8] selftests: ublk: add test for per io daemons

On Tue, May 27, 2025 at 05:01:30PM -0600, Uday Shankar wrote:
> Add a new test test_generic_12 which:
> 
> - sets up a ublk server with per_io_tasks and a different number of ublk
>   server threads and ublk_queues. This is possible now that these
>   objects are decoupled
> - runs some I/O load from a single CPU
> - verifies that all the ublk server threads handle some I/O
> 
> Before this changeset, this test fails, since I/O issued from one CPU is
> always handled by the one ublk server thread. After this changeset, the
> test passes.
> 
> In the future, the last check above may be strengthened to "verify that
> all ublk server threads handle the same amount of I/O." However, this
> requires some adjustments/bugfixes to tag allocation, so this work is
> postponed to a followup.
> 
> Signed-off-by: Uday Shankar <ushankar@...estorage.com>

Reviewed-by: Ming Lei <ming.lei@...hat.com>

Thanks,
Ming