From: Bart Van Assche <bvanassche@acm.org>
To: Kanchan Joshi <joshi.k@samsung.com>,
axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, hare@suse.de,
sagi@grimberg.me, martin.petersen@oracle.com, brauner@kernel.org,
viro@zeniv.linux.org.uk, jack@suse.cz, jaegeuk@kernel.org,
bcrl@kvack.org, dhowells@redhat.com, asml.silence@gmail.com
Cc: linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org,
io-uring@vger.kernel.org, linux-block@vger.kernel.org,
linux-aio@kvack.org, gost.dev@samsung.com, vishak.g@samsung.com,
javier.gonz@samsung.com, Hui Qi <hui81.qi@samsung.com>,
Nitesh Shetty <nj.shetty@samsung.com>
Subject: Re: [PATCH v7 1/3] nvme: enable FDP support
Date: Wed, 2 Oct 2024 11:37:11 -0700 [thread overview]
Message-ID: <38daf18f-7637-4c27-9a43-67ad39dc15c0@acm.org> (raw)
In-Reply-To: <20240930181305.17286-2-joshi.k@samsung.com>
On 9/30/24 11:13 AM, Kanchan Joshi wrote:
> Flexible Data Placement (FDP), as ratified in TP 4146a, allows the host
> to control the placement of logical blocks so as to reduce the SSD WAF.
>
> Userspace can send the data lifetime information using the write hints.
> The SCSI driver (sd) can already pass this information to the SCSI
> devices. This patch does the same for NVMe.
>
> Fetch the placement-identifiers if the device supports FDP.
> The incoming write-hint is mapped to a placement-identifier, which in
> turn is set in the DSPEC field of the write command.
Is the description of this patch correct? The above description suggests
that FDP information is similar in nature to SCSI data lifetime
information. I don't think that's correct.
Thanks,
Bart.
next prev parent reply other threads:[~2024-10-02 18:37 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20240930182052epcas5p37edefa7556b87c3fbb543275756ac736@epcas5p3.samsung.com>
2024-09-30 18:13 ` [PATCH v7 0/3] FDP and per-io hints Kanchan Joshi
[not found] ` <CGME20240930182056epcas5p33f823c00caadf9388b509bafcad86f3d@epcas5p3.samsung.com>
2024-09-30 18:13 ` [PATCH v7 1/3] nvme: enable FDP support Kanchan Joshi
2024-10-02 18:37 ` Bart Van Assche [this message]
2024-10-03 12:55 ` Christoph Hellwig
[not found] ` <CGME20240930182100epcas5p31a010c225f3c76aa4dc54fced32abd2a@epcas5p3.samsung.com>
2024-09-30 18:13 ` [PATCH v7 2/3] block, fs: restore kiocb based write hint processing Kanchan Joshi
[not found] ` <CGME20240930182103epcas5p4c9e91ca3cdf20e900b1425ae45fef81d@epcas5p4.samsung.com>
2024-09-30 18:13 ` [PATCH v7 3/3] io_uring: enable per-io hinting capability Kanchan Joshi
2024-10-02 14:26 ` Pavel Begunkov
2024-10-17 14:58 ` Kanchan Joshi
2024-10-02 18:29 ` Bart Van Assche
2024-10-01 9:20 ` [PATCH v7 0/3] FDP and per-io hints Christoph Hellwig
2024-10-01 15:58 ` James R. Bergsten
2024-10-01 16:18 ` Jens Axboe
2024-10-02 7:51 ` Christoph Hellwig
2024-10-02 15:03 ` Jens Axboe
2024-10-02 15:13 ` Christoph Hellwig
2024-10-02 15:17 ` Keith Busch
2024-10-02 15:19 ` Christoph Hellwig
2024-10-02 15:33 ` Keith Busch
2024-10-03 12:51 ` Christoph Hellwig
2024-10-02 15:47 ` Martin K. Petersen
2024-10-02 18:34 ` Bart Van Assche
2024-10-03 12:55 ` Christoph Hellwig
2024-10-03 21:48 ` Keith Busch
2024-10-03 22:00 ` Bart Van Assche
2024-10-03 22:12 ` Jens Axboe
2024-10-03 22:17 ` Keith Busch
2024-10-04 6:21 ` Javier González
2024-10-04 6:24 ` Christoph Hellwig
2024-10-04 6:59 ` Javier González
2024-10-04 12:32 ` Christoph Hellwig
2024-10-07 11:29 ` Javier González
2024-10-08 12:27 ` Christoph Hellwig
2024-10-03 12:54 ` Christoph Hellwig
2024-10-03 22:14 ` Jens Axboe
2024-10-04 5:31 ` Christoph Hellwig
2024-10-04 6:18 ` Javier González
2024-10-04 6:27 ` Christoph Hellwig
2024-10-04 6:52 ` Javier González
2024-10-04 12:30 ` Christoph Hellwig
2024-10-07 10:10 ` Javier González
2024-10-08 10:06 ` Hans Holmberg
2024-10-09 14:36 ` Javier Gonzalez
2024-10-10 6:40 ` Hans Holmberg
2024-10-10 7:13 ` Javier Gonzalez
2024-10-10 9:20 ` Christoph Hellwig
2024-10-10 12:22 ` Javier Gonzalez
2024-10-11 8:56 ` Christoph Hellwig
2024-10-11 12:21 ` Javier Gonzalez
2024-10-11 16:59 ` Keith Busch
2024-10-10 10:46 ` Hans Holmberg
[not found] ` <CGME20241010122734eucas1p1e20a5263a4d69db81b50b8b03608fad1@eucas1p1.samsung.com>
2024-10-10 12:27 ` Javier Gonzalez
2024-10-11 8:59 ` Christoph Hellwig
2024-10-08 12:25 ` Christoph Hellwig
2024-10-08 14:44 ` Keith Busch
2024-10-09 9:28 ` Christoph Hellwig
2024-10-09 15:06 ` Keith Busch
[not found] ` <CGME20241010070738eucas1p2057209e5f669f37ca586ad4a619289ed@eucas1p2.samsung.com>
2024-10-10 7:07 ` Javier González
2024-10-10 9:13 ` Christoph Hellwig
2024-10-10 11:59 ` Javier González
2024-10-11 9:02 ` Christoph Hellwig
2024-10-11 17:08 ` Jens Axboe
2024-10-14 6:21 ` Christoph Hellwig
2024-10-14 7:02 ` Javier Gonzalez
2024-10-14 7:47 ` Christoph Hellwig
2024-10-14 9:08 ` Javier Gonzalez
2024-10-14 11:50 ` Christoph Hellwig
2024-10-15 3:07 ` Javier Gonzalez
2024-10-15 5:30 ` Christoph Hellwig
2024-10-10 9:10 ` Christoph Hellwig
2024-10-09 16:28 ` Nitesh Shetty
2024-10-02 15:22 ` Jens Axboe
2024-10-01 16:23 ` Keith Busch
2024-10-02 7:49 ` Christoph Hellwig
2024-10-02 14:56 ` Keith Busch
2024-10-02 15:00 ` Jens Axboe
2024-10-03 0:20 ` Bart Van Assche
2024-10-15 5:50 ` Christoph Hellwig
2024-10-15 15:09 ` Keith Busch
2024-10-15 15:22 ` Christoph Hellwig
2024-10-17 14:35 ` Kanchan Joshi
2024-10-17 15:23 ` Christoph Hellwig
2024-10-17 15:44 ` Keith Busch
2024-10-17 15:46 ` Christoph Hellwig
2024-10-17 16:06 ` Keith Busch
2024-10-17 16:15 ` Bart Van Assche
2024-10-17 16:23 ` Keith Busch
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