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Commit 9bc898c7 authored by Wang Nan's avatar Wang Nan Committed by Arnaldo Carvalho de Melo
Browse files

perf tests: Add LLVM test for eBPF on-the-fly compiling 



Previous patches introduce llvm__compile_bpf() to compile source file to
eBPF object. This patch adds testcase to test it. It also tests libbpf
by opening generated object after applying next patch which introduces
HAVE_LIBBPF_SUPPORT option.

Since llvm__compile_bpf() prints long messages which users who don't
explicitly test llvm doesn't care, this patch set verbose to -1 to
suppress all debug, warning and error message, and hint user use 'perf
test -v' to see the full output.

For the same reason, if clang is not found in PATH and there's no [llvm]
section in .perfconfig, skip this test.

Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
Acked-by: default avatarAlexei 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: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/n/1436445342-1402-17-git-send-email-wangnan0@huawei.com


[ Add tools/lib/bpf/ to tools/perf/MANIFEST, so that the tarball targets build ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 0c6d18bf

tools/perf/MANIFEST

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ tools/arch/x86/include/asm/atomic.h 
tools/arch/x86/include/asm/rmwcc.h

tools/lib/traceevent

tools/lib/api

tools/lib/bpf

tools/lib/hweight.c

tools/lib/rbtree.c

tools/lib/symbol/kallsyms.c

tools/perf/tests/Build

+1 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ perf-y += sample-parsing.o 
perf-y += parse-no-sample-id-all.o

perf-y += kmod-path.o

perf-y += thread-map.o

perf-y += llvm.o



perf-$(CONFIG_X86) += perf-time-to-tsc.o

tools/perf/tests/builtin-test.c

+4 −0
Original line number Diff line number Diff line
@@ -174,6 +174,10 @@ static struct test { 
		.desc = "Test thread map",

		.func = test__thread_map,

	},

	{

		.desc = "Test LLVM searching and compiling",

		.func = test__llvm,

	},

	{

		.func = NULL,

	},

tools/perf/tests/llvm.c

0 → 100644
+98 −0
Original line number Diff line number Diff line 
#include <stdio.h>

#include <bpf/libbpf.h>

#include <util/llvm-utils.h>

#include <util/cache.h>

#include "tests.h"

#include "debug.h"



static int perf_config_cb(const char *var, const char *val,

			  void *arg __maybe_unused)

{

	return perf_default_config(var, val, arg);

}



/*

 * Randomly give it a "version" section since we don't really load it

 * into kernel

 */

static const char test_bpf_prog[] =

	"__attribute__((section(\"do_fork\"), used)) "

	"int fork(void *ctx) {return 0;} "

	"char _license[] __attribute__((section(\"license\"), used)) = \"GPL\";"

	"int _version __attribute__((section(\"version\"), used)) = 0x40100;";



#ifdef HAVE_LIBBPF_SUPPORT

static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)

{

	struct bpf_object *obj;



	obj = bpf_object__open_buffer(obj_buf, obj_buf_sz);

	if (!obj)

		return -1;

	bpf_object__close(obj);

	return 0;

}

#else

static int test__bpf_parsing(void *obj_buf __maybe_unused,

			     size_t obj_buf_sz __maybe_unused)

{

	fprintf(stderr, " (skip bpf parsing)");

	return 0;

}

#endif



int test__llvm(void)

{

	char *tmpl_new, *clang_opt_new;

	void *obj_buf;

	size_t obj_buf_sz;

	int err, old_verbose;



	perf_config(perf_config_cb, NULL);



	/*

	 * Skip this test if user's .perfconfig doesn't set [llvm] section

	 * and clang is not found in $PATH, and this is not perf test -v

	 */

	if (verbose == 0 && !llvm_param.user_set_param && llvm__search_clang()) {

		fprintf(stderr, " (no clang, try 'perf test -v LLVM')");

		return TEST_SKIP;

	}



	old_verbose = verbose;

	/*

	 * llvm is verbosity when error. Suppress all error output if

	 * not 'perf test -v'.

	 */

	if (verbose == 0)

		verbose = -1;



	if (!llvm_param.clang_bpf_cmd_template)

		return -1;



	if (!llvm_param.clang_opt)

		llvm_param.clang_opt = strdup("");



	err = asprintf(&tmpl_new, "echo '%s' | %s", test_bpf_prog,

		       llvm_param.clang_bpf_cmd_template);

	if (err < 0)

		return -1;

	err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);

	if (err < 0)

		return -1;



	llvm_param.clang_bpf_cmd_template = tmpl_new;

	llvm_param.clang_opt = clang_opt_new;

	err = llvm__compile_bpf("-", &obj_buf, &obj_buf_sz);



	verbose = old_verbose;

	if (err) {

		if (!verbose)

			fprintf(stderr, " (use -v to see error message)");

		return -1;

	}



	err = test__bpf_parsing(obj_buf, obj_buf_sz);

	free(obj_buf);

	return err;

}

tools/perf/tests/tests.h

+1 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ int test__fdarray__filter(void); 
int test__fdarray__add(void);

int test__kmod_path__parse(void);

int test__thread_map(void);

int test__llvm(void);



#if defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__)

#ifdef HAVE_DWARF_UNWIND_SUPPORT