linux-kernel - Re: [PATCH V13 REBASED 0/8] block, bfq: extend bfq to support multi-actuator drives

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Date:   Wed, 04 Jan 2023 11:05:11 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Paolo Valente <paolo.valente@...aro.org>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        arie.vanderhoeven@...gate.com, rory.c.chen@...gate.com,
        glen.valante@...aro.org, damien.lemoal@...nsource.wdc.com
Subject: Re: [PATCH V13 REBASED 0/8] block, bfq: extend bfq to support
 multi-actuator drives


On Tue, 03 Jan 2023 15:54:55 +0100, Paolo Valente wrote:
> rebased V13 [2].
> 
> Here is the whole description of this patch series again.  This
> extension addresses the following issue. Single-LUN multi-actuator
> SCSI drives, as well as all multi-actuator SATA drives appear as a
> single device to the I/O subsystem [1].  Yet they address commands to
> different actuators internally, as a function of Logical Block
> Addressing (LBAs). A given sector is reachable by only one of the
> actuators. For example, Seagate’s Serial Advanced Technology
> Attachment (SATA) version contains two actuators and maps the lower
> half of the SATA LBA space to the lower actuator and the upper half to
> the upper actuator.
> 
> [...]

Applied, thanks!

[1/8] block, bfq: split sync bfq_queues on a per-actuator basis
      commit: abc653033297fb39c097f9e18cc4ab42a5c00a23
[2/8] block, bfq: forbid stable merging of queues associated with different actuators
      commit: d591f14a59ed700caff6db734ecf558387d38f35
[3/8] block, bfq: move io_cq-persistent bfqq data into a dedicated struct
      commit: d85fed150b4efadf01ea3d12ba78285f6720f583
[4/8] block, bfq: turn bfqq_data into an array in bfq_io_cq
      commit: 7cf744815a3cd94591b0227f3c63f533f3402a47
[5/8] block, bfq: split also async bfq_queues on a per-actuator basis
      commit: 8249909fe789d7dc50f6749bbdf440d69ac46ac1
[6/8] block, bfq: retrieve independent access ranges from request queue
      commit: b3d9aece342834ef3840b55a99a11dc82b1f96cc
[7/8] block, bfq: inject I/O to underutilized actuators
      commit: 3f40467eb5ec1e4f383daff7f93c7494e7881fee
[8/8] block, bfq: balance I/O injection among underutilized actuators
      commit: dd9b66eb9ed5c0e58098c336cb8e6329590564be

Best regards,
-- 
Jens Axboe