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SubjectRe: [PATCH 00/14] perf clang: Support compiling BPF script use builtin clang
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On 2016/9/24 23:16, Alexei Starovoitov wrote:
> On Fri, Sep 23, 2016 at 12:49:47PM +0000, Wang Nan wrote:
>> This patch set is the first step to implement features I announced
>> in LinuxCon NA 2016. See page 31 of:
>>
>> http://events.linuxfoundation.org/sites/events/files/slides/Performance%20Monitoring%20and%20Analysis%20Using%20perf%20and%20BPF_1.pdf
>>
>> This patch set links LLVM and Clang libraries to perf, so perf
>> is able to compile BPF script to BPF object on the fly.
> Nice!
> So single perf binary won't have llvm external dependency anymore
> or both ways will be maintained?
> The command line stays the same?

Yes. This patch set doesn't change interface. It compiles BPF script
with builtin clang, and if it fail, fall back to external clang.

> If I understand the patches correctly, this set is establishing
> the basic functionality and more complex features coming?
>

Yes. Following steps are:

1. Ease of use improvement: automatically include BPF functions
declaration and macros.

2. Perf's hook: compile part of BPF script into native code, run
them in perf when something happen. Create a channel, coordinate
BPF and native code use bpf-output event.

3. Define a new language to support common profiling task. I'm not
very clear what the new language should be. It may looks like lua,
perf converts it to C then to LLVM IR with builtin clang.

Thank you.

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