Re: [RFC PATCH v6 32/32] perf record: Add LLVM options for compiling BPF scripts

From: Wangnan (F)
Date: Tue Jun 09 2015 - 20:18:11 EST




On 2015/6/10 8:02, Alexei Starovoitov wrote:
On 6/8/15 10:50 PM, Wang Nan wrote:
Although previous patch allows setting BPF compiler related options in
perfconfig, on some ad-hoc situation it still requires passing options
through cmdline. This patch introduces 4 options to 'perf record' for
this propose: --clang-path, --clang-opt, --llc-path and --llc-opt.

looks good. I hope only --clang will be used from time to time.

Right. Please see another mail I posted. I'd like to generate command using
command template instead of printf() in next version.

Today, indeed, --llc* are needed too.


With template, --llc can be removed now.

btw, our experimental libbpfprog.so (which is clang and llvm libs
compiled into single .so with C api for compiling .c into bpf):
$ ls -lh libbpfprog.so
-rw-r--r-- 1 ast ast 31M Jun 9 16:49 libbpfprog.so

not tiny, but I think we should be able to include it into perf,
then perf will only have build dependencies on llvm instead of
run-time dependencies.
We'll release this lib as soon as it's a bit more stable.


Could you please give me some URL to LLVM git repositories so I can
track your work on it?

Thank you.

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