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

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Message-ID: <55777E9E.1000808@plumgrid.com>
Date:	Tue, 09 Jun 2015 17:02:38 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Wang Nan <wangnan0@...wei.com>, acme@...nel.org,
	brendan.d.gregg@...il.com, daniel@...earbox.net,
	namhyung@...nel.org, masami.hiramatsu.pt@...achi.com,
	paulus@...ba.org, a.p.zijlstra@...llo.nl, mingo@...hat.com,
	jolsa@...nel.org, dsahern@...il.com
CC:	linux-kernel@...r.kernel.org, lizefan@...wei.com,
	hekuang@...wei.com, xiakaixu@...wei.com, pi3orama@....com
Subject: Re: [RFC PATCH v6 32/32] perf record: Add LLVM options for compiling
 BPF scripts

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

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.

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