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title: Trace Time Spent in wait4 Syscalls name: wait4time.stp version: 1.0 author: Daniel Berrange and Will Cohen keywords: syscall process subsystem: syscall status: production exit: user-controlled output: trace scope: system-wide description: The script watches each wait4 syscall on the system. At the end of each wait4 syscall the script prints out a line with a timestamp in microseconds, the pid, the executable name in parentheses, the "wait4:" key, the duration of the wait and the PID that the wait4 was waiting for. If the waited for PID is not specified , it is "-1". test_check: stap -p4 wait4time.stp test_installcheck: stap wait4time.stp -T 1