perf bench: Modify builtin-bench.c for processing common options

This patch modifies builtin-bench.c for processing common
options. The first option added is "--format".
Users of perf bench will be able to specify output style by
--format.

Usage example:

 % ./perf bench sched messaging		# with no style specify
 (20 sender and receiver processes per group)
 (10 groups == 400 processes run)

         Total time:1.431 sec

 % ./perf bench --format=simple sched messaging # specified
 simple 1.431
Signed-off-by: NHitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1257808802-9420-3-git-send-email-mitake@dcl.info.waseda.ac.jp>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

tools/perf/builtin-bench.c

@@ -74,53 +74,104 @@ static void dump_suites(int subsys_index)
 	return;
 }
 
+static char *bench_format_str;
+int bench_format = BENCH_FORMAT_DEFAULT;
+
+static const struct option bench_options[] = {
+	OPT_STRING('f', "format", &bench_format_str, "default",
+		    "Specify format style"),
+	OPT_END()
+};
+
+static const char * const bench_usage[] = {
+	"perf bench [<common options>] <subsystem> <suite> [<options>]",
+	NULL
+};
+
+static void print_usage(void)
+{
+	int i;
+
+	printf("Usage: \n");
+	for (i = 0; bench_usage[i]; i++)
+		printf("\t%s\n", bench_usage[i]);
+	printf("\n");
+
+	printf("List of available subsystems...\n\n");
+
+	for (i = 0; subsystems[i].name; i++)
+		printf("\t%s: %s\n",
+		       subsystems[i].name, subsystems[i].summary);
+	printf("\n");
+}
+
+static int bench_str2int(char *str)
+{
+	if (!str)
+		return BENCH_FORMAT_DEFAULT;
+
+	if (!strcmp(str, BENCH_FORMAT_DEFAULT_STR))
+		return BENCH_FORMAT_DEFAULT;
+	else if (!strcmp(str, BENCH_FORMAT_SIMPLE_STR))
+		return BENCH_FORMAT_SIMPLE;
+
+	return BENCH_FORMAT_UNKNOWN;
+}
+
 int cmd_bench(int argc, const char **argv, const char *prefix __used)
 {
 	int i, j, status = 0;
 
 	if (argc < 2) {
 		/* No subsystem specified. */
-		printf("Usage: perf bench <subsystem> <suite> [<options>]\n\n");
-		printf("List of available subsystems...\n\n");
+		print_usage();
+		goto end;
+	}
 
-		for (i = 0; subsystems[i].name; i++)
-			printf("\t%s: %s\n",
-			       subsystems[i].name, subsystems[i].summary);
-		printf("\n");
+	argc = parse_options(argc, argv, bench_options, bench_usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	bench_format = bench_str2int(bench_format_str);
+	if (bench_format == BENCH_FORMAT_UNKNOWN) {
+		printf("Unknown format descriptor:%s\n", bench_format_str);
+		goto end;
+	}
 
+	if (argc < 1) {
+		print_usage();
 		goto end;
 	}
 
 	for (i = 0; subsystems[i].name; i++) {
-		if (strcmp(subsystems[i].name, argv[1]))
+		if (strcmp(subsystems[i].name, argv[0]))
 			continue;
 
-		if (argc < 3) {
+		if (argc < 2) {
 			/* No suite specified. */
 			dump_suites(i);
 			goto end;
 		}
 
 		for (j = 0; subsystems[i].suites[j].name; j++) {
-			if (strcmp(subsystems[i].suites[j].name, argv[2]))
+			if (strcmp(subsystems[i].suites[j].name, argv[1]))
 				continue;
 
-			status = subsystems[i].suites[j].fn(argc - 2,
-							    argv + 2, prefix);
+			status = subsystems[i].suites[j].fn(argc - 1,
+							    argv + 1, prefix);
 			goto end;
 		}
 
-		if (!strcmp(argv[2], "-h") || !strcmp(argv[2], "--help")) {
+		if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
 			dump_suites(i);
 			goto end;
 		}
 
-		printf("Unknown suite:%s for %s\n", argv[2], argv[1]);
+		printf("Unknown suite:%s for %s\n", argv[1], argv[0]);
 		status = 1;
 		goto end;
 	}
 
-	printf("Unknown subsystem:%s\n", argv[1]);
+	printf("Unknown subsystem:%s\n", argv[0]);
 	status = 1;
 
 end: