Eduardo Horvath says:

> For kernel profiling you still need to build a profiling kernel and add
> code to function entry and exits, don't you? 

No. You just need to start a timer which, periodically:

- looks at SR
- if in kernel mode, looks at PC and frame pointer, and using frame pointer,
calling functions' PC,

- statistically sums both.

The real work is to map PC region to function call, but this can be done
off-measurement.

Of course, your method would work, too.

	-is