doc/SystemTap_Beginners_Guide/en-US/extras/para-callgraph-simple.stp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

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) }