Re: [PATCH v6 0/4] Add MMC software queue support

[Martin K. Petersen]

Christoph,

> equivalent to SCSI logical units and nvme namespace, just with a
> pretty idiotic design decision that only allows I/O to one of them at
> a time.  The block layer way to deal with them is to use a shared
> tagset for multiple request queues, which doesn't use up a whole lot
> of resources.  The only hard part is the draining when switching
> between partitions, and there is no really nice way to deal with that.
> If requests are batched enough we could just drain and switch every
> time an other partition access comes in.

This mirrors single_lun in SCSI closely. I was hoping we could
eventually get rid of that travesty but if MMC needs something similar,
maybe it would be good to move that plumbing to block?

-- 
Martin K. Petersen	Oracle Linux Engineering