linux-kernel - Re: [RFC PATCH] blk-mq: change bio_set

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Message-ID: <9e093f5d-f9fb-1ed6-3598-5d4c46838a09@kernel.dk>
Date:   Tue, 30 Aug 2022 18:59:12 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Liu Song <liusong@...ux.alibaba.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] blk-mq: change bio_set_ioprio to inline

On 8/30/22 6:42 PM, Liu Song wrote:
> 
> On 2022/8/30 21:59, Jens Axboe wrote:
>> On 8/30/22 3:45 AM, Liu Song wrote:
>>> From: Liu Song <liusong@...ux.alibaba.com>
>>>
>>> Change "bio_set_ioprio" to inline to avoid calling overhead.
>> Let's not try to 2nd guess the compiler here. Most things that are
>> marked inline should not be.
> Agree, I think there is something wrong with the commit log written here,
> it should be expected to reduce the call overhead, bio_set_ioprio seems
> to be appropriate to use inline.

I'm sure it's worth inlining, but did you check if it isn't already?
If it's small I'd fully expect the compiler to inline it already,
without needing to add things to do so.

-- 
Jens Axboe