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Re: DTrace FBT provider heads-up
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:
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