perf probe -L on ubuntu 16.04

[Arnaldo Carvalho de Melo]

Hi Masami,

	Have you ever tried using 'perf probe' on ubuntu?

acme@ubuntu:~/git/linux$ sudo apt-cache search linux-image-$(uname -r)
linux-image-4.4.0-21-generic - Linux kernel image for version 4.4.0 on
64 bit x86 SMP
linux-image-4.4.0-21-generic-dbgsym - Linux kernel debug image for
version 4.4.0 on 64 bit x86 SMP
acme@ubuntu:~/git/linux$ 
acme@ubuntu:~/git/linux$ 

So those are installed, but then I try:


root@ubuntu:~# perf probe -vvv -L getname_flags
Looking at the vmlinux_path (8 entries long)
Using /usr/lib/debug/boot/vmlinux-4.4.0-21-generic for symbols
Open Debuginfo file: /usr/lib/debug/boot/vmlinux-4.4.0-21-generic
fname: /build/linux-Ay7j_C/linux-4.4.0/fs/namei.c, lineno:125
New line range: 125 to 2147483647
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
Get 3665 lines from this CU
path: /build/linux-Ay7j_C/linux-4.4.0/fs/namei.c
Failed to find source file path.
  Error: Failed to show lines. Reason: No such file or directory (Code: -2)
root@ubuntu:~# 

Couldn't find the source code files, which is the case:

acme@ubuntu:~/git/linux$ dpkg -L linux-image-$(uname -r)-dbgsym | grep
'\.c'
acme@ubuntu:~/git/linux$ dpkg -L linux-image-$(uname -r)-dbgsym | grep
'\.ko' | tail -2
/usr/lib/debug/lib/modules/4.4.0-21-generic/kernel/crypto/pcbc.ko
/usr/lib/debug/lib/modules/4.4.0-21-generic/kernel/crypto/crc32.ko
acme@ubuntu:~/git/linux$ 

Have to dig deeper to see where the source code is, ideas?

- Arnaldo