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Re: [Qemu-block] [RFC] QMP design: Fixing query-block and friends


From: Alberto Garcia
Subject: Re: [Qemu-block] [RFC] QMP design: Fixing query-block and friends
Date: Fri, 30 Jun 2017 15:01:57 +0200
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Tue 27 Jun 2017 06:31:45 PM CEST, Kevin Wolf wrote:
> * Speaking of recursion: ImageInfo recursively includes information
>   about all images in the backing chain. This is what makes the output
>   of query-named-block-nodes so redundant. It is also inconsistent
>   because the runtime information (BlockInfo/BlockDeviceInfo) isn't
>   recursive.

I've also been told of cases where a query-block command on a VM with a
very large amount of images in all backing chains would slow down the
guest because of this recursion.

I haven't been able to reproduce this problem myself, but being able to
see only the devices seen by the guest (as opposed to the complete
graph) seems like a good idea.

Berto



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