From: Christoph Hellwig <hch@lst.de>
To: Damien Le Moal <dlemoal@kernel.org>
Cc: Bart Van Assche <bvanassche@acm.org>,
Nitesh Shetty <nj.shetty@samsung.com>,
Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Jonathan Corbet <corbet@lwn.net>,
Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@kernel.org>,
Mikulas Patocka <mpatocka@redhat.com>,
Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>,
Chaitanya Kulkarni <kch@nvidia.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
martin.petersen@oracle.com, david@fromorbit.com, hare@suse.de,
damien.lemoal@opensource.wdc.com, anuj20.g@samsung.com,
joshi.k@samsung.com, nitheshshetty@gmail.com,
gost.dev@samsung.com, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
dm-devel@lists.linux.dev, linux-nvme@lists.infradead.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v20 02/12] Add infrastructure for copy offload in block and request layer.
Date: Wed, 26 Jun 2024 07:22:38 +0200 [thread overview]
Message-ID: <20240626052238.GC21996@lst.de> (raw)
In-Reply-To: <05c7c08d-f512-4727-ae3c-aba6e8f2973f@kernel.org>
On Wed, Jun 26, 2024 at 06:18:18AM +0900, Damien Le Moal wrote:
>
> DM can deal with "abnormal" BIOs on its own. There is code for that.
> See is_abnormal_io() and __process_abnormal_io(). Sure, that will need more code
> compared to a bio sector+size based simple split, but I do not think it is a big
> deal given the potential benefits of the offloading.
It's not just dm. You also need it in the partition remapping code
(mandatory), md (nice to have), etc.
And then we have the whole mess of what is in the payload for the I/O
stack vs what is in the payload for the on the wire protocol, which
will have different formatting and potentially also different sizes.
next prev parent reply other threads:[~2024-06-26 5:22 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20240520102747epcas5p33497a911ca70c991e5da8e22c5d1336b@epcas5p3.samsung.com>
2024-05-20 10:20 ` [PATCH v20 00/12] Implement copy offload support Nitesh Shetty
[not found] ` <CGME20240520102830epcas5p27274901f3d0c2738c515709890b1dec4@epcas5p2.samsung.com>
2024-05-20 10:20 ` [PATCH v20 01/12] block: Introduce queue limits and sysfs for copy-offload support Nitesh Shetty
2024-05-20 14:33 ` Damien Le Moal
2024-05-21 8:15 ` Nitesh Shetty
2024-05-20 22:42 ` Bart Van Assche
2024-05-21 14:25 ` Nitesh Shetty
2024-05-22 17:49 ` Bart Van Assche
2024-05-23 7:05 ` Nitesh Shetty
2024-05-21 6:57 ` Hannes Reinecke
2024-06-01 5:53 ` Christoph Hellwig
2024-06-03 6:43 ` Nitesh Shetty
[not found] ` <CGME20240520102842epcas5p4949334c2587a15b8adab2c913daa622f@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 02/12] Add infrastructure for copy offload in block and request layer Nitesh Shetty
2024-05-20 15:00 ` Damien Le Moal
2024-05-21 10:50 ` Nitesh Shetty
2024-05-20 23:00 ` Bart Van Assche
2024-05-21 11:17 ` Nitesh Shetty
2024-05-22 17:58 ` Bart Van Assche
2024-05-21 7:01 ` Hannes Reinecke
2024-05-24 6:54 ` Nitesh Shetty
[not found] ` <66503bc7.630a0220.56c85.8b9dSMTPIN_ADDED_BROKEN@mx.google.com>
2024-05-24 13:52 ` Bart Van Assche
2024-05-27 8:27 ` Nitesh Shetty
2024-05-28 14:07 ` Bart Van Assche
2024-05-22 18:05 ` Bart Van Assche
2024-05-23 11:34 ` Nitesh Shetty
2024-05-24 20:33 ` Bart Van Assche
2024-05-29 6:17 ` Nitesh Shetty
2024-05-29 7:48 ` Damien Le Moal
2024-05-29 22:41 ` Bart Van Assche
2024-05-30 7:16 ` Nitesh Shetty
[not found] ` <665850bd.050a0220.a5e6b.5b72SMTPIN_ADDED_BROKEN@mx.google.com>
2024-05-30 17:11 ` Bart Van Assche
2024-05-31 10:17 ` Nitesh Shetty
[not found] ` <6659b691.630a0220.90195.d0ebSMTPIN_ADDED_BROKEN@mx.google.com>
2024-05-31 23:45 ` Bart Van Assche
2024-06-01 5:59 ` Christoph Hellwig
2024-06-03 17:12 ` Bart Van Assche
2024-06-04 4:40 ` Christoph Hellwig
2024-06-04 11:44 ` Bart Van Assche
2024-06-05 8:20 ` Christoph Hellwig
[not found] ` <CGME20240624105121epcas5p3a5a8c73bd5ef19c02e922e5829a4dff0@epcas5p3.samsung.com>
2024-06-24 10:44 ` Nitesh Shetty
[not found] ` <6679526f.170a0220.9ffd.aefaSMTPIN_ADDED_BROKEN@mx.google.com>
2024-06-24 16:25 ` Bart Van Assche
2024-06-24 21:55 ` Damien Le Moal
2024-06-25 18:18 ` Bart Van Assche
2024-06-25 21:18 ` Damien Le Moal
2024-06-26 5:22 ` Christoph Hellwig [this message]
2024-06-28 13:53 ` Bart Van Assche
[not found] ` <66795280.630a0220.f3ccd.b80cSMTPIN_ADDED_BROKEN@mx.google.com>
2024-06-24 22:58 ` Keith Busch
[not found] ` <CGME20240606072827epcas5p285de8d4f3b0f6d3a87f8341414336b42@epcas5p2.samsung.com>
2024-06-06 7:28 ` Nitesh Shetty
[not found] ` <66618886.630a0220.4d4fc.1c9cSMTPIN_ADDED_BROKEN@mx.google.com>
2024-06-06 16:44 ` Bart Van Assche
2024-06-01 5:57 ` Christoph Hellwig
[not found] ` <CGME20240520102853epcas5p42d635d6712b8876ea22a45d730cb1378@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 03/12] block: add copy offload support Nitesh Shetty
2024-06-01 6:16 ` Christoph Hellwig
2024-06-04 10:50 ` Nitesh Shetty
[not found] ` <CGME20240520102906epcas5p15b5a0b3c8edd0bf3073030a792a328bb@epcas5p1.samsung.com>
2024-05-20 10:20 ` [PATCH v20 04/12] block: add emulation for copy Nitesh Shetty
2024-05-21 7:06 ` Hannes Reinecke
2024-05-21 11:29 ` Nitesh Shetty
2024-06-01 6:18 ` Christoph Hellwig
[not found] ` <CGME20240520102917epcas5p1bda532309b9174bf2702081f6f58daf7@epcas5p1.samsung.com>
2024-05-20 10:20 ` [PATCH v20 05/12] fs/read_write: Enable copy_file_range for block device Nitesh Shetty
2024-05-21 7:07 ` Hannes Reinecke
2024-05-25 23:02 ` Dave Chinner
2024-05-28 5:57 ` Nitesh Shetty
[not found] ` <CGME20240520102929epcas5p2f4456f6fa0005d90769615eb2c2bf273@epcas5p2.samsung.com>
2024-05-20 10:20 ` [PATCH v20 06/12] fs, block: copy_file_range for def_blk_ops for direct " Nitesh Shetty
2024-05-25 23:09 ` Dave Chinner
2024-05-27 8:43 ` Nitesh Shetty
[not found] ` <CGME20240520102940epcas5p2b5f38ceabe94bed3905fb386a0d65ec7@epcas5p2.samsung.com>
2024-05-20 10:20 ` [PATCH v20 07/12] nvme: add copy offload support Nitesh Shetty
2024-06-01 6:22 ` Christoph Hellwig
2024-06-03 11:43 ` Nitesh Shetty
[not found] ` <CGME20240520102952epcas5p18716d203d1810c38397e7fcc9a26922a@epcas5p1.samsung.com>
2024-05-20 10:20 ` [PATCH v20 08/12] nvmet: add copy command support for bdev and file ns Nitesh Shetty
[not found] ` <CGME20240520103004epcas5p4a18f3f6ba0f218d57b0ab4bb84c6ff18@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 09/12] dm: Add support for copy offload Nitesh Shetty
2024-05-21 7:11 ` Hannes Reinecke
2024-05-21 14:08 ` Nitesh Shetty
2024-05-22 6:22 ` Hannes Reinecke
2024-05-22 7:10 ` Nitesh Shetty
[not found] ` <CGME20240520103016epcas5p31b9a0f3637959626d49763609ebda6ef@epcas5p3.samsung.com>
2024-05-20 10:20 ` [PATCH v20 10/12] dm: Enable copy offload for dm-linear target Nitesh Shetty
2024-05-20 23:25 ` Bart Van Assche
2024-05-21 14:48 ` Nitesh Shetty
[not found] ` <CGME20240520103027epcas5p4789defe8ab3bff23bd2abcf019689fa2@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 11/12] null: Enable trace capability for null block Nitesh Shetty
2024-05-20 23:27 ` Bart Van Assche
2024-06-01 6:23 ` Christoph Hellwig
2024-06-03 11:04 ` Nitesh Shetty
[not found] ` <CGME20240520103039epcas5p4373f7234162a32222ac225b976ae30ce@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 12/12] null_blk: add support for copy offload Nitesh Shetty
2024-05-20 23:42 ` Bart Van Assche
2024-05-21 14:46 ` Nitesh Shetty
2024-05-22 17:52 ` Bart Van Assche
2024-05-23 6:55 ` Nitesh Shetty
2024-05-20 22:54 ` [PATCH v20 00/12] Implement copy offload support Bart Van Assche
2024-06-01 5:47 ` Christoph Hellwig
2024-06-03 10:53 ` Nitesh Shetty
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