You’re really not going to want to write a stack-unwinder by yourself, even
with Dwarf it’s a horrible process, like building a space-ship from cheerios.
I would recommend you take a look at this API and use it to integrate if you
are planning on unwinding the stack. It does all the DWARF magic for you.
http://www.dyninst.org/stackwalker <http://www.dyninst.org/stackwalker>
Phil
> On Feb 11, 2016, at 11:56 AM, Stephane Eranian <eran...@googlemail.com> wrote:
>
> Hi,
>
> On Wed, Feb 10, 2016 at 9:04 AM, Maxime Colmant <maxime.colm...@inria.fr
> <mailto:maxime.colm...@inria.fr>> wrote:
> Hello,
>
> I’m trying to play with the PERF_SAMPLE_STACK_USER field for recording the
> user stack level.
> I’m able to configure all the stuffs correctly and to read the corresponding
> fields (all expected bytes are read) inside the PERF_RECORD_SAMPLE record.
> However, I don’t know how to use the field data[size] from it.
>
> To unwind correctly, you need to have PERF_SAMPLE_STACK_USER and
> PERF_SAMPLE_REGS_USER so that you capture
> the machine state at the user level. You should look at the perf code, it has
> the support for this when you do:
> $ perf record --call_graph dwarf ......
> $ perf report -g
>
> I’m aware of libdwarf and libunwinding but I don’t know how to link this
> field and these libraries together.
> How can I unwind the stack with that?
>
> And yes, they are using libunwind.
>
>
>
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