Re: [PATCH v9 0/5] Initial support for multi-actuator HDDs

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On 2021/10/27 12:03, Jens Axboe wrote:
> On 10/26/21 8:49 PM, Damien Le Moal wrote:
>> On 2021/10/27 11:38, Jens Axboe wrote:
>>> On 10/26/21 8:22 PM, Damien Le Moal wrote:
>>>> From: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
>>>>
>>>> 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.
>>>
>>> I've applied 1/9 for now, as that clearly belongs in the block tree.
>>> Might be the cleanest if SCSI does a post tree that depends on
>>> for-5.16/block. Or I can apply it all as they are reviewed. Let me
>>> know.
>>
>> Forgot: They are all reviewed, including Martin who sent a Reviewed-by for the
>> series, but not an Acked-by for patch 2. As for libata patch 3, obviously, this
>> is Acked-by me.
> 
> Queued up 2-5 in the for-5.16/scsi-ma branch.
> 

Thanks !

-- 
Damien Le Moal
Western Digital Research



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