linux-kernel - Re: [PATCH RESEND 5/5] block: Remove __blk_mq_sched_bio

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Message-ID: <20200817122608.GB2213@lst.de>
Date:   Mon, 17 Aug 2020 14:26:08 +0200
From:   Christoph Hellwig <hch@....de>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc:     Christoph Hellwig <hch@....de>, axboe@...nel.dk,
        ming.lei@...hat.com, baolin.wang7@...il.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 5/5] block: Remove __blk_mq_sched_bio_merge()
 helper

On Mon, Aug 17, 2020 at 08:14:08PM +0800, Baolin Wang wrote:
> On Mon, Aug 17, 2020 at 08:32:41AM +0200, Christoph Hellwig wrote:
> > On Mon, Aug 17, 2020 at 12:09:19PM +0800, Baolin Wang wrote:
> > > The blk_mq_sched_bio_merge() just wrap the __blk_mq_sched_bio_merge(), and
> > > no other places will use __blk_mq_sched_bio_merge(). Thus we can combine
> > > these 2 similar functions into one function.
> > 
> > I think the idea was to avoid the function call for the nomerges fast
> > path.  Not sure if that is really worth it.
> 
> Um, no places will use __blk_mq_sched_bio_merge(), not sure if it is a
> good choice we still keep an unused and similar function?

Well, blk_mq_sched_bio_merge calls __blk_mq_sched_bio_merge, after
performing two fast path checks.