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From: Matthew Wilcox <>
To: Naohiro Aota <>
	Andrew Morton <>
Subject: Project idea: Swap to zoned block devices
Date: Tue, 15 Oct 2019 04:35:48 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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.

  parent reply	other threads:[~2019-10-15 11:35 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-15  4:38 [PATCH] mm, swap: disallow swapon() on zoned block devices Naohiro Aota
2019-10-15  7:57 ` Christoph Hellwig
2019-10-15  8:58 ` [PATCH v2] " Naohiro Aota
2019-10-15  9:06   ` Christoph Hellwig
2019-10-15 20:43     ` Andrew Morton
2019-10-15 11:35 ` Matthew Wilcox [this message]
2019-10-15 13:27   ` Project idea: Swap to " Theodore Y. Ts'o
2019-10-15 13:48   ` Hannes Reinecke
2019-10-15 14:50     ` Christopher Lameter
2019-10-15 15:09     ` Matthew Wilcox
2019-10-15 15:22       ` Hannes Reinecke

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