[Bug translator/7042] Make upstream kernel developers happy

[mhiramat at redhat dot com]

------- Additional Comments From mhiramat at redhat dot com  2009-01-27 01:21 -------
Here, I'd like to try to figure out technical details of my idea.

> - Modify ftrace to support kernel modules. this might have to involve
> Steven Rostedt.

This basically means exporting register_tracer() for kernel modules and adding
unregister_tracer().

> - Modify staprun/stapio to support ftrace interface, and replace transport
> functions with ftrace interfaces.

staprun may not be changed so much. stapio will be changed, but mainly the
change will be just about the path of debugfs file.

> - Get rid of duplicate codes from runtime.

this needs more investigation. I assume that most of autoconfs will be removed
and some of safety memory/register accessing code should be merged to upstream
kernel for debugging.

> - Modify translator to generate ftrace module.

This doesn't means using ftrace_printk(). Systemtap will generate a kernel
module which has a struct tracer and its own ring buffer file(because several
tracers will run in parallel).

> - Push useful parts of runtime code to upstream kernel(might be "kernel
> APIs for tracers").

As I said above, some of safety code should be merged, and other utility codes
including unwinder, map, statistics, taskfinder and so on.



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http://sourceware.org/bugzilla/show_bug.cgi?id=7042

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