Re: "perf script" broken with --call-graph=dwarf on recent kernels?

[Jiri Olsa <jolsa@redhat.com>]

On Mon, Aug 17, 2015 at 12:25:29PM -0400, Ben Redelings wrote:

SNIP

> (/home/bredelings/Devel/bali-phy/local/clang-3.7/bin/bali-phy)
>                   306ce1 empirical_frequencies
> (/home/bredelings/Devel/bali-phy/local/clang-3.7/bin/bali-phy)
>                   3330d9 get_smodel
> (/home/bredelings/Devel/bali-phy/local/clang-3.7/bin/bali-phy)
>                   4dc133 get_smodels
> (/home/bredelings/Devel/bali-phy/local/clang-3.7/bin/bali-phy)
>                   4e02ea create_A_and_T_model
> (/home/bredelings/Devel/bali-phy/local/clang-3.7/bin/bali-phy)
> 
> This is more what I was expecting, and similar to what I used to get with
> --call-graph=dwarf.
> 
> However, the call chains that I get using DWARF tend to be longer and lead
> to more accurate results, so I would prefer to use DWARF instead of lbr.  Is
> there something that I'm doing wrong?  Also, it seems like
> --call-graph=dwarf successfully records call chains that can be seen via
> perf report, but somehow 'perf script' doesn't show them.  Could that
> happen?
> 
> -BenRI
> 
> P.S. I'm using debian's kernel 4.1.0 and perf tools on a Core i3-4030.

hum, it's probably fixed already:
http://marc.info/?l=linux-kernel&m=143945026316969&w=2

it's currently in Arnaldo's perf/core branch

jirka