stap -b .... generates per-cpu binary files with an undocumented timestamp field to enable later merging. But we don't ship such a merging tool, nor document the timestamp field. We should do both.
e25a872fe19d5428945e4a4a9b655d66f0321b27 documentation was added in a stap-merge.1 man page, stap_merge.c was used instead of a .tcl script for improved performance of sorting