Re: [PATCH] Linux Kernel Markers

Mathieu Desnoyers
2006-09-19T17:44:00Z

* Vara Prasad (prasadav@us.ibm.com) wrote:
> It is an interesting idea but there appears to be following hard issues
> (some of which you have already listed) i am not able to see how we can
> overcome them
>
> 1) We are going to have a duplicate of the whole function which means
> any significant changes in the original function needs to be done on the
> copy as well, you think maintainers would like this double work idea.
>
Not with my marker proposal. There is only need to compile it with different
flags.

> 2) Inline functions is often the place where we need a fast path to
> overcome the current kprobes overhead.
>
> 3) As you said it is not trivial across all the platforms to do a switch
> to the instrumented function from the original during the execution.
> This problem is similar to the issue we are dealing with djprobes.
>

I would really like to know how good djprobes is at instrumenting the
prologue of a function.

Mathieu

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