perf top: Add --hierarchy option

Support hierarchy output for perf-top using --hierarchy option.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1456326830-30456-19-git-send-email-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-top.txt

@@ -233,6 +233,9 @@ Default is to monitor all CPUS.
 --raw-trace::
 	When displaying traceevent output, do not use print fmt or plugins.
 
+--hierarchy::
+	Enable hierarchy output.
+
 INTERACTIVE PROMPTING KEYS
 --------------------------
 

tools/perf/builtin-top.c

@@ -1214,6 +1214,8 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 		     parse_branch_stack),
 	OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
 		    "Show raw trace event output (do not use print fmt or plugins)"),
+	OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
+		    "Show entries in a hierarchy"),
 	OPT_END()
 	};
 	const char * const top_usage[] = {
@@ -1241,6 +1243,19 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 		goto out_delete_evlist;
 	}
 
+	if (symbol_conf.report_hierarchy) {
+		/* disable incompatible options */
+		symbol_conf.event_group = false;
+		symbol_conf.cumulate_callchain = false;
+
+		if (field_order) {
+			pr_err("Error: --hierarchy and --fields options cannot be used together\n");
+			parse_options_usage(top_usage, options, "fields", 0);
+			parse_options_usage(NULL, options, "hierarchy", 0);
+			goto out_delete_evlist;
+		}
+	}
+
 	sort__mode = SORT_MODE__TOP;
 	/* display thread wants entries to be collapsed in a different tree */
 	sort__need_collapse = 1;