linux-kernel - Re: [PATCH 3/5] ftrace: print real return in dumpstack for function graph

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Message-ID: <20081203081151.GE21006@elte.hu>
Date:	Wed, 3 Dec 2008 09:11:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 3/5] ftrace: print real return in dumpstack for
	function graph


* Steven Rostedt <rostedt@...dmis.org> wrote:

> This does give a funny side effect in the stack tracer output:
> 
>         Depth   Size      Location    (80 entries)
>         -----   ----      --------
>   0)     4144      48   save_stack_trace+0x2f/0x4d
>   1)     4096     128   ftrace_call+0x5/0x2b
>   2)     3968      16   mempool_alloc_slab+0x16/0x18
>   3)     3952     384   return_to_handler+0x0/0x73
>   4)     3568    -240   stack_trace_call+0x11d/0x209
>   5)     3808     144   return_to_handler+0x0/0x73
>   6)     3664    -128   mempool_alloc+0x4d/0xfe
>   7)     3792     128   return_to_handler+0x0/0x73
>   8)     3664     -32   scsi_sg_alloc+0x48/0x4a [scsi_mod]
> 
> As you can see, the real functions are now negative. This is due
> to them not being found inside the stack.

Can we do something to output something less funny?

	Ingo
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