F8 RPMS for x86_64 here, will build for other arches soon. If you saw a bitfield related BRAIN FART ALERT! please try again with this release.
ctracer on this release already generates systemtap scripts, here is a callgraph generated with it. Nevermind the timestamps, its using a too expensive routine.
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BTW, the expensive routine being used is probably not any particular timestamp-gathering function, but the kprobes breakpoint system underneath these probes.