When using bcc to trace, it displays function name as unknown.
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Description
Hi,
When I use `trace` to trace systemd, it display function name as unknown.
```
[root@node-1 tools]# ./trace -UK "do_rmdir" -p 1
PID TID COMM FUNC
1 1 systemd do_rmdir
do_rmdir+0x0 [kernel]
el0_svc_handler+0xa0 [kernel]
el0_svc+0x8 [kernel]
__rmdir+0x14 [libc-2.17.so]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
[unknown] [systemd]
__libc_start_main+0xf0 [libc-2.17.so]
[unknown] [systemd]
[unknown]
```
Did I miss something ?
How can I get the correct function name, Thanks.
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