Edit File: syscalllatency.stp
#!/usr/bin/stap # # Copyright (C) 2018 Red Hat, Inc. # By William Cohen, Red Hat Inc. # wcohen@redhat.com # # USAGE: stap syscalllatencybypid.stp --suppress-handler-errors # # The "--suppress-handler-errors" option allows the script to continue # run when probes are skipped. The probe skips make the data less accurate, # but are otherwise harmless. global arr%[20000], sys%[20000], entry_time%[20000] probe syscall_any { entry_time[tid()] = gettimeofday_ns(); sys[tid()] = syscall_nr } probe syscall_any.return { et = entry_time[tid()] id = sys[tid()] delete entry_time[tid()] delete sys[tid()] if (et) arr[pid(), id] += (gettimeofday_ns() - et) } probe scheduler.process_exit { delete arr[pid(),*] } function ns2sec:string(v:long) { return sprintf("%d.%d", v/1000000000, v%1000000000) } probe prometheus { @prometheus_dump_array2_map(arr, "time", "pid", "syscall", ns2sec, sprint, syscall_name) }