From: Niklas Cassel <Niklas.Cassel@wdc.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Bart Van Assche <bvanassche@acm.org>,
Jens Axboe <axboe@kernel.dk>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>,
Damien Le Moal <dlemoal@kernel.org>
Subject: Re: [PATCH 00/13] Pass data temperature information to zoned UFS devices
Date: Mon, 2 Oct 2023 11:53:15 +0000 [thread overview]
Message-ID: <ZRqvJsF6s5OrFlC4@x1-carbon> (raw)
In-Reply-To: <ZRqrl7+oopXnn8r5@x1-carbon>
On Mon, Oct 02, 2023 at 01:37:59PM +0200, Niklas Cassel wrote:
> On Wed, Sep 27, 2023 at 03:14:10PM -0400, Martin K. Petersen wrote:
> >
> > Hi Bart!
> >
> > > Zoned UFS vendors need the data temperature information. Hence this
> > > patch series that restores write hint information in F2FS and in the
> > > block layer. The SCSI disk (sd) driver is modified such that it passes
> > > write hint information to SCSI devices via the GROUP NUMBER field.
> >
> > I don't have any particular problems with your implementation, although
> > I'm still trying to wrap my head around how to make this coexist with my
> > I/O hinting series. But I guess there's probably not going to be a big
> > overlap between devices that support both features.
>
> Hello Bart, Martin,
>
> I don't know which user facing API Martin's I/O hinting series is intending
> to use.
>
> However, while discussing this series at ALPSS, we did ask ourselves why this
> series is not reusing the already existing block layer API for providing I/O
> hints:
> https://github.com/torvalds/linux/blob/v6.6-rc4/include/uapi/linux/ioprio.h#L83-L103
>
> We can have 1023 possible I/O hints, and so far we are only using 7, which
> means that there are 1016 possible hints left.
> This also enables you to define more than the 4 previous temperature hints
> (extreme, long, medium, short), if so desired.
>
> There is also support in fio for these I/O hints:
> https://github.com/axboe/fio/blob/master/HOWTO.rst?plain=1#L2294-L2302
>
> When this new I/O hint API has added, there was no other I/O hint API
> in the kernel (since the old fcntl() F_GET_FILE_RW_HINT / F_SET_FILE_RW_HINT
> API had already been removed when this new API was added).
>
> So there should probably be a good argument why we would want to introduce
> yet another API for providing I/O hints, instead of extending the I/O hint
> API that we already have in the kernel right now.
> (Especially since it seems fairly easy to modify your patches to reuse the
> existing API.)
One argument might be that the current I/O hints API does not allow hints to
be stacked. So one would not e.g. be able to combine a command duration limit
with a temperature hint...
Kind regards,
Niklas
next prev parent reply other threads:[~2023-10-02 11:53 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-20 19:14 [PATCH 00/13] Pass data temperature information to zoned UFS devices Bart Van Assche
2023-09-20 19:14 ` [PATCH 01/13] fs/f2fs: Restore the whint_mode mount option Bart Van Assche
2023-10-02 10:32 ` Avri Altman
2023-10-03 19:33 ` Bean Huo
2023-09-20 19:14 ` [PATCH 02/13] fs: Restore support for F_GET_FILE_RW_HINT and F_SET_FILE_RW_HINT Bart Van Assche
2023-10-02 10:35 ` Avri Altman
2023-10-03 19:42 ` Bean Huo
2023-09-20 19:14 ` [PATCH 03/13] fs: Restore kiocb.ki_hint Bart Van Assche
2023-10-02 10:45 ` Avri Altman
2023-10-02 16:39 ` Bart Van Assche
2023-09-20 19:14 ` [PATCH 04/13] block: Restore write hint support Bart Van Assche
2023-10-02 11:23 ` Avri Altman
2023-10-02 17:02 ` Bart Van Assche
2023-10-02 18:08 ` Avri Altman
2023-10-03 19:52 ` Bean Huo
2023-09-20 19:14 ` [PATCH 05/13] scsi: core: Query the Block Limits Extension VPD page Bart Van Assche
2023-10-02 11:29 ` Avri Altman
2023-09-20 19:14 ` [PATCH 06/13] scsi_proto: Add struct io_group_descriptor Bart Van Assche
2023-10-02 11:41 ` Avri Altman
2023-10-02 17:16 ` Bart Van Assche
2023-10-02 18:16 ` Avri Altman
2023-09-20 19:14 ` [PATCH 07/13] sd: Translate data lifetime information Bart Van Assche
2023-10-02 13:11 ` Avri Altman
2023-10-02 17:42 ` Bart Van Assche
2023-10-03 5:48 ` Avri Altman
2023-10-03 16:58 ` Bart Van Assche
2023-10-03 16:59 ` Bart Van Assche
2023-09-20 19:14 ` [PATCH 08/13] scsi_debug: Reduce code duplication Bart Van Assche
2023-10-03 6:49 ` Avri Altman
2023-09-20 19:14 ` [PATCH 09/13] scsi_debug: Support the block limits extension VPD page Bart Van Assche
2023-09-20 19:14 ` [PATCH 10/13] scsi_debug: Rework page code error handling Bart Van Assche
2023-09-20 19:14 ` [PATCH 11/13] scsi_debug: Rework subpage " Bart Van Assche
2023-09-20 19:14 ` [PATCH 12/13] scsi_debug: Implement the IO Advice Hints Grouping mode page Bart Van Assche
2023-09-20 19:14 ` [PATCH 13/13] scsi_debug: Maintain write statistics per group number Bart Van Assche
2023-09-20 19:28 ` [PATCH 00/13] Pass data temperature information to zoned UFS devices Matthew Wilcox
2023-09-20 20:46 ` Bart Van Assche
2023-09-21 7:46 ` Niklas Cassel
2023-09-21 14:27 ` Bart Van Assche
2023-09-21 15:34 ` Niklas Cassel
2023-09-21 17:00 ` Bart Van Assche
2023-09-21 19:27 ` Matthew Wilcox
2023-09-21 19:39 ` Bart Van Assche
2023-09-21 19:46 ` Matthew Wilcox
2023-09-21 20:11 ` Bart Van Assche
2023-09-21 20:47 ` Jaegeuk Kim
2023-09-27 19:14 ` Martin K. Petersen
2023-09-27 20:49 ` Bart Van Assche
2023-10-02 11:38 ` Niklas Cassel
2023-10-02 11:53 ` Niklas Cassel [this message]
2023-10-02 16:33 ` Bart Van Assche
2023-10-02 19:19 ` Niklas Cassel
2023-10-02 17:20 ` Bart Van Assche
2023-10-03 1:40 ` Martin K. Petersen
2023-10-03 17:26 ` Bart Van Assche
2023-10-03 18:45 ` Niklas Cassel
2023-10-04 3:17 ` Martin K. Petersen
[not found] ` <CGME20230920191557epcas2p34a114957acf221c0d8f60acbb3107c77@epcms2p6>
2023-10-05 11:41 ` [PATCH 01/13] fs/f2fs: Restore the whint_mode mount option Daejun Park
[not found] ` <CGME20230920191549epcas2p35174687f1bebe87c42a658fa6aa57bff@epcms2p7>
2023-10-05 11:43 ` [PATCH 02/13] fs: Restore support for F_GET_FILE_RW_HINT and F_SET_FILE_RW_HINT Daejun Park
[not found] ` <CGME20230920191556epcas2p39b150e6715248b625588a50b333e82e2@epcms2p1>
2023-10-05 11:46 ` [PATCH 04/13] block: Restore write hint support Daejun Park
[not found] ` <CGME20230920191816epcas2p1b30d19aa41e51ffaf7c95f9100ee6311@epcms2p3>
2023-10-05 11:58 ` [PATCH 05/13] scsi: core: Query the Block Limits Extension VPD page Daejun Park
[not found] ` <CGME20230920191554epcas2p2280a25d6b2a7fa81563bd6cf1e75549d@epcms2p8>
2023-10-05 11:59 ` [PATCH 06/13] scsi_proto: Add struct io_group_descriptor Daejun Park
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