linux-kernel - perf probe -L on ubuntu 16.04

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Message-ID: <20160517015636.GC3455@kernel.org>
Date:	Mon, 16 May 2016 22:56:36 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <mhiramat@...nel.org>
Cc:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: perf probe -L on ubuntu 16.04

Hi Masami,

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

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

So those are installed, but then I try:

root@...ntu:~# 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
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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@...ntu:~# 

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

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

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

- Arnaldo