linux-kernel - Re: [RFC PATCH v7 37/37] perf record: Add clang options for compiling BPF scripts

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Date:	Fri, 12 Jun 2015 14:08:10 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	<acme@...nel.org>, <ast@...mgrid.com>, <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 v7 37/37] perf record: Add clang options for compiling
 BPF scripts



On 2015/6/12 13:35, 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 2 options to 'perf record' for
> this propose: --clang-path and --clang-opt.
>
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> ---
>   tools/perf/builtin-record.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index c15865f..3ec8cee 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -30,6 +30,7 @@
>   #include "util/auxtrace.h"
>   #include "util/parse-branch-options.h"
>   #include "util/bpf-loader.h"
> +#include "util/llvm-utils.h"
>   
>   #include <unistd.h>
>   #include <sched.h>
> @@ -1068,6 +1069,12 @@ struct option __record_options[] = {
>   	parse_clockid),
>   	OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
>   			  "opts", "AUX area tracing Snapshot Mode", ""),
> +#ifdef HAVE_LIBBPF_SUPPORT"

Sorry for this extra ". It is not a part of this patch.

> +	OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
> +		   "clang binary to use for compiling BPF scriptlets"),
> +	OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
> +		   "options passed to clang when compiling BPF scriptlets"),
> +#endif
>   	OPT_END()
>   };
>   


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