#! /usr/bin/env stap
#
# Copyright (C) 2018 Red Hat, Inc.
# By William Cohen, Red Hat Inc.
# wcohen@redhat.com
#
# USAGE: stap syscallbypid.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]
global procname%
      
probe syscall_any {
  arr[pid(), syscall_nr]++
  procname[pid()] = execname()
}

probe scheduler.process_exit {
  delete arr[pid(),*]
  delete procname[pid()]
}

function process_name(pid) {
  return sprintf("%s[%d]", procname[pid], pid)
}

probe prometheus {
  @prometheus_dump_array2_map(arr, "syscall_count", "pid", "name",
                              sprint, process_name, syscall_name )
}