DWARF support is needed for things like accessing variables in 'perf probe'. I created a perf-dwarf feature back in July: http://git.yoctoproject.org/cgit/cgit.cgi/poky-contrib/log/?h=tzanussi/perf-dwarf But it caused perf to segfault and I never got back to it.
I have a version that doesn't segfault, but doesn't find the debug info it needs. Need to debug further.
Merged: https://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=6ebeeab6a6d195f1637ebf8c386de477a94e5f26