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From: Jens Axboe <>
To: Damien Le Moal <>,,,
	"Martin K . Petersen" <>,
Subject: Re: [PATCH v8 0/5] Initial support for multi-actuator HDDs
Date: Tue, 26 Oct 2021 18:45:33 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 9/8/21 8:35 PM, Damien Le Moal wrote:
> Single LUN multi-actuator hard-disks are cappable to seek and execute
> multiple commands in parallel. This capability is exposed to the host
> using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA).
> Each positioning range describes the contiguous set of LBAs that an
> actuator serves.
> This series adds support to the scsi disk driver to retreive this
> information and advertize it to user space through sysfs. libata is
> also modified to handle ATA drives.
> The first patch adds the block layer plumbing to expose concurrent
> sector ranges of the device through sysfs as a sub-directory of the
> device sysfs queue directory. Patch 2 and 3 add support to sd and
> libata. Finally patch 4 documents the sysfs queue attributed changes.
> Patch 5 fixes a typo in the document file (strictly speaking, not
> related to this series).
> This series does not attempt in any way to optimize accesses to
> multi-actuator devices (e.g. block IO schedulers or filesystems). This
> initial support only exposes the independent access ranges information
> to user space through sysfs.

Let's get this queued up for 5.16. I forgot what we agreed upon, can go
either block or SCSI. We likely have a bunch more block changes this
round than usual, and hence a higher risk of conflict, so from that
perspective alone I think the block layer would be easier.

In any case, Damien, it needs a respin as it doesn't apply against
my for-5.16/block at this point.

Jens Axboe

  parent reply	other threads:[~2021-10-27  0:45 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-09  2:35 Damien Le Moal
2021-09-09  2:35 ` [PATCH v8 1/5] block: Add independent access ranges support Damien Le Moal
2021-09-09  5:59   ` Hannes Reinecke
2021-09-09  2:35 ` [PATCH v8 2/5] scsi: sd: add concurrent positioning " Damien Le Moal
2021-09-09  6:00   ` Hannes Reinecke
2021-09-09  2:35 ` [PATCH v8 3/5] libata: support concurrent positioning ranges log Damien Le Moal
2021-09-09  2:35 ` [PATCH v8 4/5] doc: document sysfs queue/independent_access_ranges attributes Damien Le Moal
2021-09-09  2:35 ` [PATCH v8 5/5] doc: Fix typo in request queue sysfs documentation Damien Le Moal
2021-09-14  0:38 ` [PATCH v8 0/5] Initial support for multi-actuator HDDs Damien Le Moal
2021-09-27  9:17 ` Damien Le Moal
2021-09-29  3:55 ` Martin K. Petersen
2021-10-11  7:50 ` Damien Le Moal
2021-10-11 11:28   ` Tim Walker
2021-10-15  8:20   ` Damien Le Moal
2021-10-27  0:34 ` Keith Busch
2021-10-27  0:45 ` Jens Axboe [this message]
2021-10-27  0:49   ` Damien Le Moal

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