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syscallbypid-nd_example.txt
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Examples of execsnoop-nd.stp, the Linux SystemTap version. This traces syscalls system-wide, and produces a summary report showing their counts by process ID, process name, and syscall type. For example: # ./syscallbypid-nd.stp Tracing syscall completions... Hit Ctrl-C to end. ^C PID CMD SYSCALL COUNT 4282 bash read 1 4283 bash ioctl 1 902 crond select 1 4283 bash setpgid 1 902 crond stat 1 4283 bash read 1 902 crond rt_sigaction 1 14409 bash stat 1 4279 stapio rt_sigreturn 1 4279 stapio pselect6 1 14564 sshd ioctl 1 4282 bash ioctl 1 4282 bash setpgid 1 4279 stapio write 1 4283 curl execve 1 4283 curl connect 1 4282 curl pipe 1 4282 curl set_tid_address 1 4283 curl setsockopt 1 4282 curl gettid 1 785 auditd gettimeofday 1 4282 curl ioctl 1 4282 curl getsockname 1 4282 curl rt_sigprocmask 1 4283 curl write 1 4046 syscallbypid-nd rt_sigprocmask 1 4279 stapio madvise 1 4283 curl statfs 1 4282 curl getsockopt 1 4283 curl bind 1 4283 curl getrlimit 1 4282 curl arch_prctl 1 4283 curl recvfrom 1 4282 curl connect 1 4282 curl execve 1 4279 stapio tgkill 1 4283 curl pipe 1 4283 curl set_tid_address 1 4282 curl setsockopt 1 4283 curl gettid 1 4283 curl ioctl 1 4282 curl write 1 4283 curl getsockname 1 4283 curl rt_sigprocmask 1 4283 curl getsockopt 1 4282 curl statfs 1 4282 curl getrlimit 1 4282 curl bind 1 4283 curl arch_prctl 1 4282 curl recvfrom 1 4279 stapio futex 1 4283 bash close 2 15216 node close 2 4282 bash close 2 15216 node write 2 14409 bash rt_sigreturn 2 902 crond rt_sigprocmask 2 14409 bash sendmsg 2 4282 curl sendto 2 4283 curl munmap 2 4282 curl access 2 4283 curl fcntl 2 14409 bash pipe 2 14409 bash clone 2 14409 bash setpgid 2 14409 bash socket 2 4283 curl sendto 2 4282 curl fcntl 2 4283 curl access 2 4282 curl munmap 2 785 auditd clock_gettime 2 14409 bash time 3 14564 sshd read 3 14564 sshd write 3 4283 bash rt_sigprocmask 3 902 crond read 3 902 crond fstat 3 902 crond munmap 3 902 crond open 3 4282 bash rt_sigprocmask 3 902 crond close 3 902 crond mmap2 3 902 crond time 3 4282 curl brk 3 4282 curl rt_sigaction 3 4282 curl recvmsg 3 4283 curl futex 3 4283 curl socket 3 4283 curl brk 3 15216 SignalSender futex 3 4283 curl rt_sigaction 3 4283 curl recvmsg 3 4282 curl futex 3 4282 curl socket 3 14409 bash wait4 4 15216 node accept4 4 15216 node futex 4 15216 node read 4 4279 stapio fcntl 4 4282 curl time 4 4283 curl time 4 14564 sshd select 5 15216 SignalSender nanosleep 5 4283 curl poll 5 4282 curl poll 5 15216 node epoll_wait 6 15216 node epoll_ctl 6 14409 bash close 6 4283 bash rt_sigaction 7 4282 bash rt_sigaction 7 14564 sshd rt_sigprocmask 12 14409 bash ioctl 20 14405 sshd ioctl 20 4282 curl clock_gettime 24 4283 curl clock_gettime 24 15216 node clock_gettime 26 14409 bash read 28 14409 bash write 29 4283 curl read 32 4282 curl read 32 4282 curl open 34 4283 curl fstat 34 4283 curl open 34 4282 curl fstat 34 4279 stapio ppoll 38 4282 curl close 38 4283 curl close 38 4279 stapio read 42 14409 bash rt_sigaction 48 14405 sshd write 49 14405 sshd read 49 4282 curl mprotect 58 4283 curl mprotect 58 4282 curl mmap2 91 4283 curl mmap2 91 14405 sshd select 97 14409 bash rt_sigprocmask 111 14405 sshd rt_sigprocmask 196 This can be used to get a handle on syscall usage and rates before using more expensive tools to measure their behavior. The output is limited to 2048 rows. If it exceeds that, for example, because of many short-lived processes each with their own PID, then you will see the following error: # ./syscallbypid-nd.stp Tracing syscall completions... Hit Ctrl-C to end. ERROR: Array overflow, check MAXMAPENTRIES near identifier 'num' at ./syscallbypid-nd.stp:32:2 WARNING: Number of errors: 1, skipped probes: 0 WARNING: /usr/local/bin/staprun exited with status: 1 Pass 5: run failed. [man error::pass5] See the oneliners.txt for probing syscalls without breaking down by PID to start with.