linux-kernel - Re: [PATCH v3 21/49] blk-merge: compute bio->bi_seg_front

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Message-ID: <20170810121139.GD14607@infradead.org>
Date:   Thu, 10 Aug 2017 05:11:39 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
        Huang Ying <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 21/49] blk-merge: compute bio->bi_seg_front_size
 efficiently

On Tue, Aug 08, 2017 at 04:45:20PM +0800, Ming Lei wrote:
> It is enough to check and compute bio->bi_seg_front_size just
> after the 1st segment is found, but current code checks that
> for each bvec, which is inefficient.
> 
> This patch follows the way in  __blk_recalc_rq_segments()
> for computing bio->bi_seg_front_size, and it is more efficient
> and code becomes more readable too.

As far as I can tell this doesn't depend on anything else in the
series and could be sent standalone?