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

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Message-ID: <55A88085.8090407@plumgrid.com>
Date:	Thu, 16 Jul 2015 21:11:49 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	He Kuang <hekuang@...wei.com>, pi3orama <pi3orama@....com>,
	Namhyung Kim <namhyung@...nel.org>
Cc:	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"masami.hiramatsu.pt@...achi.com" <masami.hiramatsu.pt@...achi.com>,
	"acme@...nel.org" <acme@...nel.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"jolsa@...nel.org" <jolsa@...nel.org>,
	"wangnan0@...wei.com" <wangnan0@...wei.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to
 perf event

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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