From: Matthew Wilcox <willy@infradead.org>
To: Naohiro Aota <naohiro.aota@wdc.com>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-block@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Project idea: Swap to zoned block devices
Date: Tue, 15 Oct 2019 04:35:48 -0700 [thread overview]
Message-ID: <20191015113548.GD32665@bombadil.infradead.org> (raw)
In-Reply-To: <20191015043827.160444-1-naohiro.aota@wdc.com>
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.
next prev 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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