linux-kernel - Re: Linux Kernel GDB tracepoint module 2010-8-30 release

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Date:	Sat, 4 Sep 2010 23:04:16 +0800
From:	Hui Zhu <teawater@...il.com>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Steven <mqyoung@...il.com>,
	"gdb@...rceware.org" <gdb@...rceware.org>,
	linux-kernel@...r.kernel.org, Michael Snyder <msnyder@...are.com>,
	Marc Khouzam <marc.khouzam@...csson.com>,
	Thiago Jung Bauermann <thiago.bauermann@...il.com>
Subject: Re: Linux Kernel GDB tracepoint module 2010-8-30 release

Hi Frank,

I met a issue with build systemtap.  Build it need (install
elfutils-devel, libebl-dev, libdw-dev and/or libebl-devel), but ubuntu
looks don't have it.

I try to build elfutils-0.148 with myself, but after I install it,
when I compile other code, I got:
/usr/local/bin/ld: /usr/lib/libelf.so.1: version `ELFUTILS_1.5' not
found (required by /usr/local/bin/ld)
collect2: ld returned 1 exit status
It really scared me.

Did you meet this issue in before?

Thanks,
Hui

On Sat, Sep 4, 2010 at 13:11, Frank Ch. Eigler <fche@...hat.com> wrote:
> Hi -
>
> On Sat, Sep 04, 2010 at 12:29:56PM +0800, Hui Zhu wrote:
>
>> [...] Could you talk about how it do call stack dump like following?
>> (gdb) trace vfs_readdir
>> Tracepoint 1 at 0xffffffff8113f7fc: file
>> /home/teawater/kernel/linux-2.6/fs/readdir.c, line 24.
>> (gdb) actions
>> >collect *(unsigned char *)$rsp@512
>
> probe kernel.function("vfs_readdir") {
>   // if you want the whole kernel-side backtrace, dwarf-unwound
>   print_backtrace()
>   // or else just hex-dump a region
>   printf("%*M\n", 512, register("rsp"))
> }
>
>
>> BTW, I was not find out which ARCH of the systemtap support in its
>> website?  It support all the arch that kprobe support?
>
> Yes, basically, though it's mostly tested on RHELy platforms (x86,
> powerpc, s390, ia64).
>
> - FChE
>
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