Documenting kernel tracepoints

[William Cohen]

There are a number of tracepoints in the latest kernels, but not much
documentation on the tracepoints.  If a very recent version of
systemtap is available on the system, a list of the probe points can
be obtained with:

stap -p2 -e 'probe kernel.trace("*") {exit()}'|sort

However, this only provides the names. It doesn't provide information
about what information the probe point provides or the arguments
available at the probe point.

Currently, a number of kernel functions and structures are documented
with embedded comments that are extracted with kernel-doc. Seems like
it would be reasonable to extend this to support tracepoints.
Any thoughts or comments about this approach?

-Will
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