Re: Unable to get a callgraph

[Richard D. <rde...@ar...>]

Hi Cyrill,

it is a 2.6 kernel in an embedded system, kernel
and libraries built specifically for this system.
No, I didn't encounter the message
"Call-graph profiling unsupported on this kernel/hardware".

Richard

Maucci, Cyrille schrieb:

>Hi Richard,
>
>When you invoke opcontrol ... --callgraph=3 ...,
>Do you get such a message?
>
>
>Call-graph profiling unsupported on this kernel/hardware
>
>
>If yes, the reason why you don't have call-graph is obvious and you need to get a kernel with call-graph support. You can achieve this by either getting a 2.6+ kernel or I know that there are also some 2.4.x kernel patches.
>
>What does 'uname -a' say on your system?
>
>++Cyrille
>
>-----Original Message-----
>From: Richard Dengler [mailto:rde...@ar...] 
>Sent: Tuesday, August 04, 2009 3:27 PM
>To: opr...@li...
>Subject: Unable to get a callgraph
>
>Hi,
>
>In spite of of using "--callgraph=3" for opcontrol I only get a flat 
>profile under
>x86 and PowerPC. The commands I use are:
>
>  opcontrol --no-vmlinux --start --callgraph=3 --separate=lib 
>--session-dir=${LOG_DIR} --image=${EXECUTABLE}
>  opreport --session-dir=${LOG_DIR} --callgraph
>
>The oprofile version is 0.94.
>Opcontrol output contains pairs of entries, one with [self] and one without
>(I don't have the output available at the moment).
>
>The opcontrol manpage says:
>  "This option is available on x86 using a 2.6+ kernel with callgraph 
>support enabled."
>  "It is also available on PowerPC using a 2.6.17+ kernel."
>
>I see that a lot of time is spent in glibc, but can't figure out, from 
>where this is called.
>How do I enable callgraph support in the kernel? What else may be wrong?
>
>Thanks for any hints
>
>Richard
>
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