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From: Markus Armbruster <armbru@redhat.com>
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Date: Mon, 26 Oct 2015 08:24:38 +0100
In-Reply-To: <562D8A2F.8000609@cn.fujitsu.com> (Wen Congyang's message of
	"Mon, 26 Oct 2015 10:04:31 +0800")
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Subject: Re: [Qemu-devel] [Qemu-block] Dynamic reconfiguration
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To: Wen Congyang <wency@cn.fujitsu.com>
Cc: Kevin Wolf <kwolf@redhat.com>, zhanghailiang <zhang.zhanghailiang@huawei.com>, qemu block <qemu-block@nongnu.org>, Jiang Yunhong <yunhong.jiang@intel.com>, Dong Eddie <eddie.dong@intel.com>, qemu devel <qemu-devel@nongnu.org>, Max Reitz <mreitz@redhat.com>, Gonglei <arei.gonglei@huawei.com>, Stefan Hajnoczi <stefanha@redhat.com>, Yang Hongyang <yanghy@cn.fujitsu.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Wen Congyang <wency@cn.fujitsu.com> writes:

> On 10/21/2015 04:27 PM, Markus Armbruster wrote:
[...]
>> Can we phrase the operation differently?  Instead of "insert between A
>> and B (silently replacing everything that is now between A and B)",
>> say one of
>> 
>> 1a. Replace node A by A <- blkdebug
>> 
>> 1b. Replace node B by blkdebug <- B
>> 
>> 2a. Replace edge A <- B by <- blkdebug <-
>>     Impossible in the current state, because there is no such edge.
>
> What does 'edge' mean?

It's graph terminology: the BB and BDS serve as the graph's nodes
(a.k.a. vertices), and the pointers connecting them serve as the graph's
edges.

[...]