Messages in this thread | | | Subject | Re: [PATCH 00/14] perf clang: Support compiling BPF script use builtin clang | From | "Wangnan (F)" <> | Date | Mon, 26 Sep 2016 09:49:30 +0800 |
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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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