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fntimes.txt
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fntimes.stp - Show Functions Taking Longer Than Usual The fntimes.stp script monitors the execution time history of a given function family (assumed non-recursive). Each time (beyond a warmup interval) is then compared to the historical maximum. If it exceeds a certain threshold (250%), a message is printed. $ stap fntimes.stp 'kernel.function("sys_*")' -T 7 function SyS_ioctl well over maximum time (32 vs 12) function SyS_open well over maximum time (2832 vs 188) function SyS_newfstat well over maximum time (5 vs 2) function SyS_mmap_pgoff well over maximum time (282 vs 12) function SyS_mmap well over maximum time (286 vs 15) function SyS_access well over maximum time (35 vs 11) function SyS_access well over maximum time (92 vs 35) function SyS_mprotect well over maximum time (44 vs 13) function SyS_futex well over maximum time (9753 vs 3260) function SyS_newstat well over maximum time (4882 vs 133) function SyS_recvmsg well over maximum time (607 vs 44) function SyS_futex well over maximum time (55896 vs 9753) function SyS_futex well over maximum time (500089 vs 55927) function SyS_poll well over maximum time (832629 vs 53308) Getting no output is not a bad thing; it means that means that functions did not exceed the threshold. This output was gathered by running ls repeatedly in another terminal a few seconds after the script started.