Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event

From	Alexei Starovoitov <ast@plumgrid.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event
Date	2015-07-17 06:20 +0200
Message-ID	<pN5hU-2OF-5@gated-at.bofh.it> (permalink)
References	(5 earlier) <pLMAG-612-27@gated-at.bofh.it> <pLMKl-64q-11@gated-at.bofh.it> <pLN3I-6be-17@gated-at.bofh.it> <pLXw7-4lA-5@gated-at.bofh.it> <pM72q-1HL-15@gated-at.bofh.it>
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On 7/14/15 4:54 AM, He Kuang wrote:
>> I'm not sure llvm generates proper dwarf along with bpf code (I didn't
>> test that part. If there are any issues they should be fixable. If you
>> can prepapre a patch for llvm that would be even better :)
>>
>
> I found objdump can't get dwarf info from bpf object file:
>
>    $ objdump --dwarf=info bpf.o
>    bpf.o: file format elf64-little
>
>    $ readelf -a bpf.o |grep debug_info
>    <EMPTY>

yeah. looks like this part is not working.
Interesting that when I do: clang -O2 -target bpf a.c -g -S
there is some minimal debug info in the .s, but .o lacks
debuginfo completely. Digging further...
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Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to  perf event Alexei Starovoitov <ast@plumgrid.com> - 2015-07-17 06:20 +0200

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