On 2021/10/27 9:45, Jens Axboe wrote: > 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. OK. Thanks. Sending a rebased version very soon (today most likely). -- Damien Le Moal Western Digital Research
