Re: DTrace FBT provider heads-up

[Darren Reed <darrenr%netbsd.org@localhost>]

Darran Hunt wrote:
> Hi all,
> 
> I've committed the Function Boundary Trace provider to NetBSD current. 
> This DTrace provider automatically instruments every function in the
> kernel with an entry and exit probe.  The probes have true zero-probe
> effect (i.e. they don't affect the system when disabled), as they don't
> actually exist in the code until they're enabled.  When enabled a probe
> directly patches the function to add a jump into FBT provider at the
> function's entry or exit points.
> 
> This gives us over 29,000 instrumentation points available for tracing
> with DTrace.  The full argument list is passed to the probe on function
> entry, and the return result is passed on exit.
> 
> More info available here:
> http://docs.sun.com/app/docs/doc/817-6223/chp-fbt?a=view

Amazing work!

Thanks,
Darren