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

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Message-ID: <20100904051138.GC10118@redhat.com>
Date:	Sat, 4 Sep 2010 01:11:38 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Hui Zhu <teawater@...il.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 -

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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