Porting "jump labels" to userspace (was: Re: [ltt-dev] LTTng-UST vs SystemTap userspace tracing benchmarks)

[Roland McGrath]

IMHO there is not really so much to the in-kernel implementation that it's
worth attempting to reuse the code in userland.  Pretty much all the work
is in the details of the implementation that would naturally differ a lot
in a different context.  If you understand the mechanism and the machine
details, then implementing it well for a userland context is not a big deal
and is cleaner to do from scratch than shoe-horning kernel-centric code
into a wildly different context.


Thanks,
Roland