testsuite/systemtap.examples/general/para-callgraph-simple.stp


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function trace(entry_p) {
   if(tid() in trace)
       printf("%s%s%s\n",thread_indent(entry_p),
                         (entry_p>0?"->":"<-"),
                         probefunc())
}

global trace
probe kernel.function(@1).call {
   if (execname() == "stapio") next # skip our own helper process
   trace[tid()] = 1
   trace(1)
}
probe kernel.function(@1).return {
   trace(-1)
   delete trace[tid()]
}

probe kernel.function(@2).call { trace(1) }
probe kernel.function(@2).return { trace(-1) }
function trace(entry_p) {
   if(tid() in trace)
       printf("%s%s%s\n",thread_indent(entry_p),
                         (entry_p>0?"->":"<-"),
                         probefunc())
}

global trace
probe kernel.function(@1).call {
   if (execname() == "stapio") next # skip our own helper process
   trace[tid()] = 1
   trace(1)
}
probe kernel.function(@1).return {
   trace(-1)
   delete trace[tid()]
}

probe kernel.function(@2).call { trace(1) }
probe kernel.function(@2).return { trace(-1) }