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Commit 71dc2326 authored by Wang Nan's avatar Wang Nan Committed by Arnaldo Carvalho de Melo
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perf record: Add clang options for compiling BPF scripts 



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: default avatarWang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1444826502-49291-9-git-send-email-wangnan0@huawei.com


[ Add the new options to the 'record' man page ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 1f45b1d4

tools/perf/Documentation/perf-record.txt

+6 −0
Original line number Diff line number Diff line
@@ -314,6 +314,12 @@ This option sets the time out limit. The default value is 500 ms. 
Record context switch events i.e. events of type PERF_RECORD_SWITCH or

PERF_RECORD_SWITCH_CPU_WIDE.



--clang-path::

Path to clang binary to use for compiling BPF scriptlets.



--clang-opt::

Options passed to clang when compiling BPF scriptlets.



SEE ALSO

--------

linkperf:perf-stat[1], linkperf:perf-list[1]

tools/perf/builtin-record.c

+7 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include "util/auxtrace.h"

#include "util/parse-branch-options.h"

#include "util/parse-regs-options.h"

#include "util/llvm-utils.h"



#include <unistd.h>

#include <sched.h>
@@ -1112,6 +1113,12 @@ struct option __record_options[] = { 
			"per thread proc mmap processing timeout in ms"),

	OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,

		    "Record context switch events"),

#ifdef HAVE_LIBBPF_SUPPORT

	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()

};