perf kmem: Introduce --list-cmds for use by scripts

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1394853474-31019-2-git-send-email-artagnon@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>

tools/perf/builtin-kmem.c

@@ -756,11 +756,13 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_BOOLEAN(0, "raw-ip", &raw_ip, "show raw ip instead of symbol"),
 	OPT_END()
 	};
-	const char * const kmem_usage[] = {
-		"perf kmem [<options>] {record|stat}",
+	const char *const kmem_subcommands[] = { "record", "stat", NULL };
+	const char *kmem_usage[] = {
+		NULL,
 		NULL
 	};
-	argc = parse_options(argc, argv, kmem_options, kmem_usage, 0);
+	argc = parse_options_subcommand(argc, argv, kmem_options,
+					kmem_subcommands, kmem_usage, 0);
 
 	if (!argc)
 		usage_with_options(kmem_usage, kmem_options);

tools/perf/perf-completion.sh

@@ -121,8 +121,8 @@ __perf_main ()
 	elif [[ $prev == "-e" && "${words[1]}" == @(record|stat|top) ]]; then
 		evts=$($cmd list --raw-dump)
 		__perfcomp_colon "$evts" "$cur"
-	# List subcommands for 'perf kvm'
-	elif [[ $prev == "kvm" ]]; then
+	# List subcommands for perf commands
+	elif [[ $prev == @(kvm|kmem) ]]; then
 		subcmds=$($cmd $prev --list-cmds)
 		__perfcomp_colon "$subcmds" "$cur"
 	# List long option names