script examples monitoring system calls examples of SystemTap scripts monitoring system calls monitoring system calls examples of SystemTap scripts system calls, monitoring examples of SystemTap scripts uses systemtap/testsuite/systemtap.examples/profiling/topsys.stp from helps you identify which applications are polling by pointing out which ones used the following system calls most frequently: poll select epoll itimer futex nanosleep signal However, in some systems, a different system call might be responsible for excessive polling. If you suspect that a polling application might is using a different system call to poll, you need to identify first the top system calls used by the system. To do this, use . lists the top 20 system calls used by the system per 5-second interval. It also lists how many times each system call was used during that period. Refer to for a sample output. script examples timer.s(), sample usage examples of SystemTap scripts timer.s(), sample usage timer.s(), sample usage examples of SystemTap scripts -------------------------------------------------------------- SYSCALL COUNT gettimeofday 1857 read 1821 ioctl 1568 poll 1033 close 638 open 503 select 455 write 391 writev 335 futex 303 recvmsg 251 socket 137 clock_gettime 124 rt_sigprocmask 121 sendto 120 setitimer 106 stat 90 time 81 sigreturn 72 fstat 66 --------------------------------------------------------------