Re: [RFC] Unify KVM kernel-space and user-space code into a singleproject

[Anthony Liguori]

On 03/17/2010 03:10 AM, Ingo Molnar wrote:
> * Anthony Liguori<anthony@xxxxxxxxxxxxx>  wrote:
>
>    
> > On 03/16/2010 12:39 PM, Ingo Molnar wrote:
> >      
> > > > If we look at the use-case, it's going to be something like, a user is
> > > > creating virtual machines and wants to get performance information about
> > > > them.
> > > >
> > > > Having to run a separate tool like perf is not going to be what they would
> > > > expect they had to do.  Instead, they would either use their existing GUI
> > > > tool (like virt-manager) or they would use their management interface
> > > > (either QMP or libvirt).
> > > >
> > > > The complexity of interaction is due to the fact that perf shouldn't be a
> > > > stand alone tool.  It should be a library or something with a programmatic
> > > > interface that another tool can make use of.
> > > >          
> > > But ... a GUI interface/integration is of course possible too, and it's being
> > > worked on.
> > >
> > > perf is mainly a kernel developer tool, and kernel developers generally dont
> > > use GUIs to do their stuff: which is the (sole) reason why its first ~850
> > > commits of tools/perf/ were done without a GUI. We go where our developers
> > > are.
> > >
> > > In any case it's not an excuse to have no proper command-line tooling. In fact
> > > if you cannot get simpler, more atomic command-line tooling right then you'll
> > > probably doubly suck at doing a GUI as well.
> > >        
> > It's about who owns the user interface.
> >
> > If qemu owns the user interface, than we can satisfy this in a very simple
> > way by adding a perf monitor command.  If we have to support third party
> > tools, then it significantly complicates things.
> >      
> Of course illogical modularization complicates things 'significantly'.
>    

Ok.  Then apply this to the kernel.  I'm then happy to take patches.

Regards,

Anthony Liguori

commit 84b84db054e83e7686b80fad9f8d2aa87aade1a1
Author: Anthony Liguori <aliguori@xxxxxxxxxx>
Date:   Thu Mar 18 09:35:29 2010 -0500

    Bring QEMU into the Linux kernel tree
    
    Ingo is under the impression that this will result in a massive improvement in
    the usability of QEMU.
    
    Signed-off-by: Anthony Liguori <aliguori@xxxxxxxxxx>

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..76cdb68
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tools/qemu"]
+	path = tools/qemu
+	url = git://git.qemu.org/qemu.git
diff --git a/MAINTAINERS b/MAINTAINERS
index 03f38c1..6275796 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4427,6 +4427,12 @@ M:	Robert Jarzmik <robert.jarzmik@xxxxxxx>
 L:	rtc-linux@xxxxxxxxxxxxxxxx
 S:	Maintained
 
+QEMU
+M:      Anthony Liguori <aliguori@xxxxxxxxxx>
+L:      qemu-devel@xxxxxxxxxx
+S:      Maintained
+F:      tools/qemu
+
 QLOGIC QLA2XXX FC-SCSI DRIVER
 M:	Andrew Vasquez <andrew.vasquez@xxxxxxxxxx>
 M:	linux-driver@xxxxxxxxxx
diff --git a/tools/qemu b/tools/qemu
new file mode 160000
index 0000000..e5322f7
--- /dev/null
+++ b/tools/qemu
@@ -0,0 +1 @@
+Subproject commit e5322f76a72352eea8eb511390c27726b64e5a87