On Tue, Oct 15, 2019 at 01:38:27PM +0900, Naohiro Aota wrote: > A zoned block device consists of a number of zones. Zones are > eitherconventional and accepting random writes or sequential and > requiringthat writes be issued in LBA order from each zone write > pointerposition. For the write restriction, zoned block devices are > notsuitable for a swap device. Disallow swapon on them.
That's unfortunate. I wonder what it would take to make the swap code be suitable for zoned devices. It might even perform better on conventional drives since swapout would be a large linear write. Swapin would be a fragmented, seeky set of reads, but this would seem like an excellent university project.
