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Subject: Re: [GIT PULL 0/6] perf/core improvements and fixes
From: pi3orama <pi3orama@163.com>
In-Reply-To: <20150604124033.GA10580@gmail.com>
Date: Thu, 4 Jun 2015 20:58:26 +0800
Cc: "Wangnan (F)" <wangnan0@huawei.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Alexei Starovoitov <ast@plumgrid.com>,
        Brendan Gregg <brendan.d.gregg@gmail.com>,
        Daniel Borkmann <daniel@iogearbox.net>,
        David Ahern <dsahern@gmail.com>, He Kuang <hekuang@huawei.com>,
        Jiri Olsa <jolsa@redhat.com>, Kaixu Xia <xiakaixu@huawei.com>,
        Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
        Zefan Li <lizefan@huawei.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Alexei Starovoitov <alexei.starovoitov@gmail.com>
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References: <1433371238-14572-1-git-send-email-acme@kernel.org> <20150604054854.GA10969@gmail.com> <556FEB32.8040909@huawei.com> <20150604072153.GA18983@gmail.com> <557021D3.7070900@huawei.com> <20150604124033.GA10580@gmail.com>
To: Ingo Molnar <mingo@kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
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> ?? 2015??6??4?գ?????8:40??Ingo Molnar <mingo@kernel.org> д????
> 
> 
> * Wangnan (F) <wangnan0@huawei.com> wrote:
> 
>>> So how do you generate the .o? Why cannot the tool, if it sees that the filter 
>>> parameter is eBPF source code, do that automatically?
>> 
>> I think compiling on the fly is our goal, and Alexei is working on it.
> 
> So what exact command line are you using to create the .o?
> 
> What exactly should users type to create a simple eBPF filter profile?
> 

I have mentioned in previous mail:

Use

 # perf record -e bpf_source.c cmdline 

 to create a eBPF filter from source,

Use

# perf record -e bpf_object.o cmdline 

to create a eBPF filter from object intermedia.

Use

# perf bpf compile bpf_source.c --kbuild=kernel-build-dir -o bpf_object.o

to create the .o

I think this should be enough. Currently only the second case has been implemented.

Thanks.

> Thanks,
> 
>    Ingo

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