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argdist, trace: Native tracepoint support (iovisor#724)
* Remove tracepoint.py The `Tracepoint` class which implements the necessary support for the tracepoint kprobe-based hack is no longer needed and can be removed. * argdist: Native tracepoint support This commit migrates argdist to use the native bcc/BPF tracepoint support instead of the hackish kprobe- based approach. The resulting programs are cleaner and likely more efficient. As a result of this change, there is a slight API change in how argdist is used with tracepoints. To access fields from the tracepoint structure, the user is expected to use `args->field` directly. This leverages most of the built-in bcc support for generating the tracepoint probe function. * trace: Native tracepoint support This commit migrates trace to use the native bcc/BPF tracepoint support instead of the hackish kprobe- based approach. The resulting programs are cleaner and likely more efficient. As with argdist, users are now expected to use the `args` structure pointer to access the tracepoint's arguments. For example: ``` trace 't:irq:irq_handler_entry (args->irq != 27) "irq %d", args->irq' ```
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