Re: [Qemu-devel] [PATCH] scripts: Add qom-tree script as modern equivalent of info qtree

[Paolo Bonzini]

Il 07/02/2014 13:44, Andreas Färber ha scritto:
> Am 07.02.2014 12:21, schrieb Paolo Bonzini:
> > Let's stop talking about theory and let's look at the actual ccode, please.
>
> I have posted actual patches, you haven't.

I have reviewed those, and said that we can apply all three.  It's 
certainly better than reverting.  That doesn't mean that keeping broken 
code would have been better than reverting.  And let me repeat that 
*reverting a broken patch should always be one of the alternatives*.

But my request to "look at the actual code" was not related to 
contribution of patches.  It referred to _all_ of QEMU device hierarchy. 
Your assertion that "qdev is dead" seems quite an exaggeration; having 
contributed quite a few patches to "kill" qdev-specific mechanisms in 
favor of generic ones, it seems very much alive to me.

Let's look at qdev.  Ask ourselves what useful functionality of Device 
has nothing to do with devices.  Ask ourselves where it clashes with the 
design of Object, and which of the two is better.  Make a design that is 
consistent with what we need, not with a generic 2-year old vision that 
sometimes borders on dogma.  Then we can write code.

This is all totally unrelated from which interesting relationships are 
useful to extract and visualize from the QOM tree---and my point there 
is that both parent-child ("qom-tree") and controller-controlled ("info 
qtree") are useful relationships.

Paolo