Re: [discuss] [PATCH] allow CONFIG_FRAME_POINTER for x86-64

[Eric Dumazet]

Philippe Elie a écrit :
> On Fri, 09 Sep 2005 at 11:23 +0000, Andi Kleen wrote:
>
>  
>
> > Indeed. Someone must have fixed it.  But why would anyone want frame pointers
> > on x86-64?
>
>
> Oprofile can use it, I though it was already used but apparently only
> to backtrace userspace actually.
Hi Pilippe

Last time I tried oprofile with call graph on my opteron machine (linux-2.6.13 
SMP), the machine crashed instantly in dump_backtrace()

Apparently the user program was in a state were 'struct frame_head * head' was 
 not part of the user thread stack, but some strange value like 
0x8000000000xxyyzz

Eric
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