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Message-ID: <20150525150827.GA27012@lst.de>
Date: Mon, 25 May 2015 17:08:27 +0200
From: Christoph Hellwig <hch@....de>
To: Ilya Dryomov <idryomov@...il.com>
Cc: Ming Lin <mlin@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Kent Overstreet <kent.overstreet@...il.com>,
Jens Axboe <axboe@...nel.dk>, Dongsu Park <dpark@...teo.net>,
Lars Ellenberg <drbd-dev@...ts.linbit.com>,
drbd-user@...ts.linbit.com, Jiri Kosina <jkosina@...e.cz>,
Yehuda Sadeh <yehuda@...tank.com>,
Sage Weil <sage@...tank.com>, Alex Elder <elder@...nel.org>,
Ceph Development <ceph-devel@...r.kernel.org>,
Alasdair Kergon <agk@...hat.com>,
Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
Neil Brown <neilb@...e.de>, linux-raid@...r.kernel.org,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Alex Elder <elder@...aro.org>
Subject: Re: [PATCH v4 08/11] block: kill merge_bvec_fn() completely
On Mon, May 25, 2015 at 06:02:30PM +0300, Ilya Dryomov wrote:
> I'm not Alex, but yeah, we have all the clone/split machinery and so we
> can handle a spanning case just fine. I think rbd_merge_bvec() exists
> to make sure we don't have to do that unless it's really necessary -
> like when a single page gets submitted at an inconvenient offset.
>
> I have a patch that adds a blk_queue_chunk_sectors(object_size) call to
> rbd_init_disk() but I haven't had a chance to play with it yet. In any
> case, we should be fine with getting rid of rbd_merge_bvec(). If this
> ends up a per-driver patchset, I can make rbd_merge_bvec() ->
> blk_queue_chunk_sectors() a single patch and push it through
> ceph-client.git.
Hmm, looks like the new blk_queue_split_bio ignore the chunk_sectors
value, another thing that needs updating. I forgot how many weird
merging hacks we had to add for nvme..
While I'd like to see per-driver patches we'd still need to merge
them together through the block tree. Note that with this series
there won't be any benefit of using blk_queue_chunk_sectors over just
doing the split in rbd. Maybe we can even remove it again and do
that work in the drivers in the future.
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