On Mon, 16 May 2016 22:56:36 -0300
Arnaldo Carvalho de Melo <[email protected]> wrote:
> 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?
It shows the "path" is ;
> path: /build/linux-Ay7j_C/linux-4.4.0/fs/namei.c
So, would you have the source code under this temporary directory?
(yeah, I guess No)
Anyway, ubuntu has "linux-source" package, or apt source linux-image-`uname -r`
will give you the source tree in current dir.
After you get a proper kernel source code, you can use -s to show source code.
-s, --source <directory>
path to kernel source
I ensured it is working correctly by below command.
$ perf probe -s ./linux-4.4.0 -L getname_flags
Enjoy! :)
--
Masami Hiramatsu <[email protected]>
