From: Paolo Bonzini <pbonzini@redhat.com>
To: "Andreas Färber" <afaerber@suse.de>, qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, armbru@redhat.com, aliguori@amazon.com,
lcapitulino@redhat.com
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 [thread overview]
Message-ID: <52F4DC99.1050106@redhat.com> (raw)
In-Reply-To: <52F4D665.1090203@suse.de>
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
next prev parent reply other threads:[~2014-02-07 13:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-05 17:35 [Qemu-devel] [PATCH] scripts: Add qom-tree script as modern equivalent of info qtree Andreas Färber
2014-02-05 17:48 ` Paolo Bonzini
2014-02-05 17:51 ` Andreas Färber
2014-02-05 17:55 ` Paolo Bonzini
2014-02-05 18:01 ` Andreas Färber
2014-02-07 7:13 ` Paolo Bonzini
2014-02-07 11:09 ` Andreas Färber
2014-02-07 11:21 ` Paolo Bonzini
2014-02-07 12:44 ` Andreas Färber
2014-02-07 13:06 ` Paolo Bonzini
2014-02-07 13:48 ` Andreas Färber
2014-02-07 14:18 ` Paolo Bonzini
2014-02-07 15:00 ` Markus Armbruster
2014-02-07 12:49 ` Andreas Färber
2014-02-07 13:16 ` Paolo Bonzini [this message]
2014-02-05 17:56 ` Andreas Färber
2014-02-05 17:58 ` Paolo Bonzini
2014-02-05 18:08 ` Andreas Färber
2014-02-07 10:41 ` Paolo Bonzini
2014-02-07 11:00 ` Andreas Färber
2014-02-07 11:10 ` Paolo Bonzini
2014-02-05 18:24 ` Eric Blake
2014-02-05 18:39 ` Andreas Färber
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