From: Keith Busch <kbusch@kernel.org>
To: Javier Gonzalez <javier.gonz@samsung.com>
Cc: Christoph Hellwig <hch@lst.de>,
Hans Holmberg <hans@owltronix.com>, Jens Axboe <axboe@kernel.dk>,
Christian Brauner <brauner@kernel.org>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Kanchan Joshi <joshi.k@samsung.com>,
"hare@suse.de" <hare@suse.de>,
"sagi@grimberg.me" <sagi@grimberg.me>,
"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
"jack@suse.cz" <jack@suse.cz>,
"jaegeuk@kernel.org" <jaegeuk@kernel.org>,
"bcrl@kvack.org" <bcrl@kvack.org>,
"dhowells@redhat.com" <dhowells@redhat.com>,
"bvanassche@acm.org" <bvanassche@acm.org>,
"asml.silence@gmail.com" <asml.silence@gmail.com>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"io-uring@vger.kernel.org" <io-uring@vger.kernel.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-aio@kvack.org" <linux-aio@kvack.org>,
"gost.dev@samsung.com" <gost.dev@samsung.com>,
"vishak.g@samsung.com" <vishak.g@samsung.com>
Subject: Re: [PATCH v7 0/3] FDP and per-io hints
Date: Fri, 11 Oct 2024 10:59:05 -0600 [thread overview]
Message-ID: <ZwlZWWiPXT4NGErp@kbusch-mbp.mynextlight.net> (raw)
In-Reply-To: <20241011122102.znguf6kpmbbsa42t@ArmHalley.local>
On Fri, Oct 11, 2024 at 02:21:02PM +0200, Javier Gonzalez wrote:
> > That's a lot of marketing babble :) What exact thing is missing
> > from the passthrough interface when using say spdx over io_uring?
>
> The block layer provides a lot of functionality that passthru cannot
> provide. A simple example would be splits. You know this :)
>
> I am sure Jens and Keith can give you more specifics on their particular
> reasons.
Splitting, merging, cgroups, iostats, error retries, failover.
We have a recent change staged in 6.13 to try to count iostats on
passthrough, but it doesn't do discards.
Passthrough to partitions requires root access and the slow CAP_SYSADMIN
check on every IO.
Page cache. Though that may not readily work with this io_uring proposal
as-is either.
The generic IO path is safe to changing formats; passthrough isn't.
And it's just generally more work to port existing applications to use
the passthrough interface. It causes duplicating solutions to scenarios
the kernel already handles.
next prev parent reply other threads:[~2024-10-11 16:59 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
2024-09-30 18:13 ` [PATCH v7 1/3] nvme: enable FDP support Kanchan Joshi
2024-10-02 18:37 ` Bart Van Assche
2024-10-03 12:55 ` Christoph Hellwig
2024-09-30 18:13 ` [PATCH v7 2/3] block, fs: restore kiocb based write hint processing Kanchan Joshi
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 [this message]
2024-10-10 10:46 ` Hans Holmberg
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
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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