|
From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [PATCH] scripts: Add qom-tree script as modern equivalent of info qtree |
Date: | Fri, 07 Feb 2014 14:16:09 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
Il 07/02/2014 13:49, Andreas Färber ha scritto:
qdev is a framework from Paul Brook with a bus-tree-oriented graph. QOM by comparison uses an arbitrary composition tree of child<> nodes. qdev as such no longer exists since late 2011 / early 2012.
Let me be blunt: to me, this is a huge, huge delusion. And I guess this difference in views is why we keep talking past each other.
First, having to kill qdev is a dogma at best. QOM allows more expressive relationships than just bus-children, but real hardware does have buses. A bus is not just a n:1 relationship between a controller and a controlled device. Buses, not composition, describe the path that signals actually follow while the system runs. Composition lets you understand how a system is built. Buses lets you run it.
Second, if anyone killed qdev, I didn't notice. At best, qdev is now implemented on top of QOM. And in fact, the "fake" buses that qdev introduced are all still there, so whoever "killed" qdev left quite a few traces behind him.
Paolo
[Prev in Thread] | Current Thread | [Next in Thread] |