linux-kernel - Re: [PATCH] block: Fix default IO priority if there is no IO context

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Message-ID: <a97c3d4d-4b69-ed64-154b-4329e94a703a@huaweicloud.com>
Date: Thu, 31 Jul 2025 15:05:15 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Guenter Roeck <linux@...ck-us.net>, Jens Axboe <axboe@...nel.dk>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 Bart Van Assche <bvanassche@....org>, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] block: Fix default IO priority if there is no IO context

在 2025/07/31 12:49, Guenter Roeck 写道:
> Upstream commit 53889bcaf536 ("block: make __get_task_ioprio() easier to
> read") changes the IO priority returned to the caller if no IO context
> is defined for the task. Prior to this commit, the returned IO priority
> was determined by task_nice_ioclass() and task_nice_ioprio(). Now it is
> always IOPRIO_DEFAULT, which translates to IOPRIO_CLASS_NONE with priority
> 0. However, task_nice_ioclass() returns IOPRIO_CLASS_IDLE, IOPRIO_CLASS_RT,
> or IOPRIO_CLASS_BE depending on the task scheduling policy, and
> task_nice_ioprio() returns a value determined by task_nice(). This causes
> regressions in test code checking the IO priority and class of IO
> operations on tasks with no IO context.
> 
> Fix the problem by returning the IO priority calculated from
> task_nice_ioclass() and task_nice_ioprio() if no IO context is defined
> to match earlier behavior.
> 
> Fixes: 53889bcaf536 ("block: make __get_task_ioprio() easier to read")
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Bart Van Assche <bvanassche@....org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>   include/linux/ioprio.h | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
LGTM
Reviewed-by: Yu Kuai <yukuai3@...wei.com>

Thanks