Re: [Qemu-devel] [PATCH v3 00/14] trace: Add static tracing to QEMU

[Daniel P. Berrange]

On Mon, Sep 06, 2010 at 04:13:57PM +0100, Stefan Hajnoczi wrote:
> This patch series adds static tracing to QEMU.  It can be used to instrument
> QEMU code by means of lightweight logging called trace events.
> 
> Prerna and I are now posting the entire patch series with a serious eye 
> towards
> checking we meet users' and developers' tracing needs and with the goal of
> getting this functionality merged into qemu.git.

The main question would be why create a tracing framework and probe
markup macros specific to QEMU ? It looks like quite a few major
open source projects (PostgreSQL, Python, TCL, OpenJDK) are using
DTrace static probe markers for code instrumentation. IIUC this
is accessible on Solaris, (Free/Net?)-BSD, OS-X and also Linux via
SystemTAP's DTrace compat layer. Is this QEMU specific probe markup
flexible enough to make it possible to also support DTrace/SystemTAP
without having to add a second set of source code markers to every
probe point ?

Regards,
Daniel
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