Hi,
On Wed, Feb 10, 2016 at 9:04 AM, Maxime Colmant <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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