linux-kernel - Re: [PATCH] loop: inherit the ioprio in loop woker thread

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Message-ID: <5166bc31-1fd9-4f7f-bc51-f1f50d9d5483@acm.org>
Date: Wed, 22 May 2024 10:38:26 -0700
From: Bart Van Assche <bvanassche@....org>
To: Yunlong Xing <yunlong.xing@...soc.com>, axboe@...nel.dk,
 yunlongxing23@...il.com, niuzhiguo84@...il.com, Hao_hao.Wang@...soc.com
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] loop: inherit the ioprio in loop woker thread

On 5/22/24 00:48, Yunlong Xing wrote:
> @@ -1913,6 +1921,10 @@ static void loop_handle_cmd(struct loop_cmd *cmd)
>   		set_active_memcg(old_memcg);
>   		css_put(cmd_memcg_css);
>   	}
> +
> +	if (ori_ioprio != cmd_ioprio)
> +		set_task_ioprio(current, ori_ioprio);
> +
>    failed:
>   	/* complete non-aio request */
>   	if (!use_aio || ret) {

Does adding this call in the hot path have a measurable performance impact?

Thanks,

Bart.