From: "Wangnan (F)" <wangnan0@huawei.com>
To: Alexei Starovoitov <ast@plumgrid.com>,
He Kuang <hekuang@huawei.com>, pi3orama <pi3orama@163.com>,
Namhyung Kim <namhyung@kernel.org>
Cc: "rostedt@goodmis.org" <rostedt@goodmis.org>,
"masami.hiramatsu.pt@hitachi.com"
<masami.hiramatsu.pt@hitachi.com>,
"acme@kernel.org" <acme@kernel.org>,
"a.p.zijlstra@chello.nl" <a.p.zijlstra@chello.nl>,
"mingo@redhat.com" <mingo@redhat.com>,
"jolsa@kernel.org" <jolsa@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event
Date: Fri, 17 Jul 2015 12:14:47 +0800 [thread overview]
Message-ID: <55A88137.7020609@huawei.com> (raw)
In-Reply-To: <55A88085.8090407@plumgrid.com>
On 2015/7/17 12:11, Alexei Starovoitov wrote:
> 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...
Glad to see you start look at it. We are not familiar with LLVM, but I was
told that LLVM has a clean structure and very easy to introduce new
features.
Could you please give us some hits on it so we can work together?
Thank you.
next prev parent reply other threads:[~2015-07-17 4:15 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-10 10:03 [RFC PATCH v4 0/3] Make eBPF programs output data to perf event He Kuang
2015-07-10 10:03 ` [RFC PATCH v4 1/3] tracing/events: Fix wrong sample output by storing array length instead of size He Kuang
2015-07-17 14:32 ` Steven Rostedt
2015-07-17 17:24 ` Sara Rostedt
2015-07-17 18:13 ` Steven Rostedt
2015-07-23 19:36 ` Alex Bennée
2015-07-10 10:03 ` [RFC PATCH v4 2/3] tools lib traceevent: Add function to get dynamic arrays length He Kuang
2015-07-10 10:03 ` [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event He Kuang
2015-07-10 22:10 ` Alexei Starovoitov
2015-07-13 4:36 ` He Kuang
2015-07-13 13:52 ` Namhyung Kim
2015-07-13 14:01 ` pi3orama
2015-07-13 14:09 ` Namhyung Kim
2015-07-13 14:29 ` pi3orama
2015-07-14 1:43 ` Alexei Starovoitov
2015-07-14 11:54 ` He Kuang
2015-07-17 4:11 ` Alexei Starovoitov
2015-07-17 4:14 ` Wangnan (F) [this message]
2015-07-17 4:27 ` Alexei Starovoitov
2015-07-23 11:54 ` He Kuang
2015-07-23 20:49 ` llvm bpf debug info. " Alexei Starovoitov
2015-07-24 3:20 ` Alexei Starovoitov
2015-07-24 4:16 ` He Kuang
2015-07-25 10:04 ` He Kuang
2015-07-28 2:18 ` Alexei Starovoitov
2015-07-29 9:38 ` He Kuang
2015-07-29 17:13 ` Alexei Starovoitov
2015-07-29 20:00 ` pi3orama
2015-07-29 22:20 ` Alexei Starovoitov
2015-07-31 10:18 ` Wangnan (F)
2015-07-31 10:20 ` [LLVM PATCH] BPF: add FRAMEADDR support Wang Nan
2015-07-31 10:21 ` [LLVM CLANG PATCH] BPF: add __builtin_bpf_typeid() Wang Nan
2015-07-31 10:48 ` llvm bpf debug info. Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event pi3orama
2015-08-03 19:44 ` Alexei Starovoitov
2015-08-04 9:01 ` Cc llvmdev: " Wangnan (F)
2015-08-05 1:58 ` Wangnan (F)
2015-08-05 2:05 ` Wangnan (F)
2015-08-05 6:51 ` [LLVMdev] " Wangnan (F)
2015-08-05 7:11 ` Alexei Starovoitov
2015-08-05 8:28 ` Wangnan (F)
2015-08-06 3:22 ` [llvm-dev] " Alexei Starovoitov
2015-08-06 4:35 ` Wangnan (F)
2015-08-06 6:55 ` Alexei Starovoitov
2015-08-12 2:34 ` Wangnan (F)
2015-08-12 4:57 ` [llvm-dev] " Alexei Starovoitov
2015-08-12 5:28 ` Wangnan (F)
2015-08-12 13:15 ` Brenden Blanco
2015-08-13 6:24 ` Wangnan (F)
2015-08-05 8:59 ` [LLVMdev] Cc llvmdev: " He Kuang
2015-08-06 3:41 ` [llvm-dev] " Alexei Starovoitov
2015-08-06 4:31 ` Wangnan (F)
2015-08-06 6:50 ` Alexei Starovoitov
2015-07-13 8:29 ` Peter Zijlstra
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