linux-kernel - Re: [PATCH v2 5/5] md: fast clone bio in bio_clone

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Date:   Tue, 14 Feb 2017 08:01:09 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <tom.leiming@...il.com>
Cc:     Shaohua Li <shli@...nel.org>, Jens Axboe <axboe@...com>,
        linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
        NeilBrown <neilb@...e.com>
Subject: Re: [PATCH v2 5/5] md: fast clone bio in bio_clone_mddev()

On Tue, Feb 14, 2017 at 11:29:03PM +0800, Ming Lei wrote:
> Firstly bio_clone_mddev() is used in raid normal I/O and isn't
> in resync I/O path.
> 
> Secondly all the direct access to bvec table in raid happens on
> resync I/O except for write behind of raid1, in which we still
> use bio_clone() for allocating new bvec table.
> 
> So this patch replaces bio_clone() with bio_clone_fast()
> in bio_clone_mddev().
> 
> Also kill bio_clone_mddev() and call bio_clone_fast() directly, as
> suggested by Christoph Hellwig.
> 
> Signed-off-by: Ming Lei <tom.leiming@...il.com>

Looks fine,

Reviewed-by: Christoph Hellwig <hch@....de>

Btw, can you also tack on another patch to kill bio_alloc_mddev
to be consistent?