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

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Date:	Fri, 03 Sep 2010 10:05:56 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Steven <mqyoung@...il.com>
Cc:	Hui Zhu <teawater@...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


Steven <mqyoung@...il.com> writes:

> [...]
>         (gdb) trace vfs_readdir 
>         Tracepoint 3 at 0xc1175690: file fs/readdir.c, line 23.
>         (gdb) actions
>         Enter actions for tracepoint 3, one per line.
>         End with a line saying just "end".
>         > collect jiffies_64
>         > collect *file
>         > end

By the way, the systemtap equivalent would be:

#! /usr/bin/stap -g
probe kernel.function("vfs_readdir") {
      println(%{ jiffies_64 %})
      println($file$)
}


> 2) I can not collect local variable, despite I rebuild the kernel with
> -O0 optimization option. what is the problem? Many thanks
>         -------------------------------------------------------------------
>         (gdb) trace fs/readdir.c:29
>         Tracepoint 2 at 0xc11756ca: file fs/readdir.c, line 29.
>         (gdb) actions 
>         Enter actions for tracepoint 2, one per line.
>         End with a line saying just "end".
>         > collect res
>         > end


#! /usr/bin/stap
probe kernel.statement("*@...readdir.c:29") {
      println($res)
}


- FChE
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