Messages in this thread | | | Date | Fri, 09 Sep 2005 14:41:06 +0200 | From | Eric Dumazet <> | Subject | Re: [discuss] [PATCH] allow CONFIG_FRAME_POINTER for x86-64 |
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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
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