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From: Eric Blake <eblake@redhat.com>
To: Aurelien Jarno <aurelien@aurel32.net>, qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
	qemu-block@nongnu.org, Markus Armbruster <armbru@redhat.com>,
	Max Reitz <mreitz@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>, John Snow <jsnow@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 1/3] hw/block: Introduce rotational qdev property
Date: Sat, 6 May 2017 12:11:58 -0500	[thread overview]
Message-ID: <10e6a024-f9d1-b33a-9181-3b896dcccd4d@redhat.com> (raw)
In-Reply-To: <20170506124314.23354-1-aurelien@aurel32.net>

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On 05/06/2017 07:43 AM, Aurelien Jarno wrote:
> The Linux kernel uses different I/O scheduler depending if the block
> device is a rotational device or not. Also it uses rotational devices
> to add entropy to the random pool.
> 
> This patch add a rotational qdev property so that the block device can
> be configured as a rotational device or a non-rotational device. Default
> to true to not change the default behavior.
> 
> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
> ---
>  blockdev.c               | 4 ++++
>  include/hw/block/block.h | 4 +++-
>  2 files changed, 7 insertions(+), 1 deletion(-)

Please remember to send a 0/3 cover letter when sending a series (you
can use 'git config format.coverletter auto' to make it easier).

The NBD server has the ability to expose to a client whether a given
exported volume is rotational or not; so there may be some additional
integration you should perform to make nbd-server properly export this
new property.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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  parent reply	other threads:[~2017-05-06 17:12 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-06 12:43 [Qemu-devel] [PATCH 1/3] hw/block: Introduce rotational qdev property Aurelien Jarno
2017-05-06 12:43 ` [Qemu-devel] [PATCH 2/3] scsi-disk: export " Aurelien Jarno
2017-05-06 16:11   ` Philippe Mathieu-Daudé
2017-05-06 12:43 ` [Qemu-devel] [PATCH 3/3] ide: " Aurelien Jarno
2017-05-06 16:11   ` Philippe Mathieu-Daudé
2017-05-08 14:50   ` John Snow
2017-05-06 16:11 ` [Qemu-devel] [PATCH 1/3] hw/block: Introduce " Philippe Mathieu-Daudé
2017-05-06 17:11 ` Eric Blake [this message]
2017-05-08 17:22 ` Stefan Hajnoczi
2017-05-09 10:12 ` Kevin Wolf

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