perf ui/stdio: Implement hierarchy output mode

The hierarchy output mode is to group entries for each level so that
user can see higher level picture more easily. It also helps to find
out which component is most costly. The output will look like below:

15.11% swapper
14.97% [kernel.vmlinux]
0.09% [libahci]
0.05% [iwlwifi]
10.29% irq/33-iwlwifi
6.45% [kernel.vmlinux]
1.41% [mac80211]
1.15% [iwldvm]
1.14% [iwlwifi]
0.14% [cfg80211]
4.81% firefox
3.92% libxul.so
0.34% [kernel.vmlinux]

Signed-off-by: Namhyung Kim <[e-mail]>
Acked-by: Pekka Enberg <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Cc: Wang Nan <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/ui/stdio/hist.c

···
 	return hpp->buf - start;
 }
 
+static int hist_entry__hierarchy_fprintf(struct hist_entry *he,
+					 struct perf_hpp *hpp,
+					 int nr_sort_key, struct hists *hists,
+					 FILE *fp)
+{
+	const char *sep = symbol_conf.field_sep;
+	struct perf_hpp_fmt *fmt;
+	char *buf = hpp->buf;
+	int ret, printed = 0;
+	bool first = true;
+
+	if (symbol_conf.exclude_other && !he->parent)
+		return 0;
+
+	ret = scnprintf(hpp->buf, hpp->size, "%*s", he->depth * HIERARCHY_INDENT, "");
+	advance_hpp(hpp, ret);
+
+	hists__for_each_format(he->hists, fmt) {
+		if (perf_hpp__is_sort_entry(fmt) || perf_hpp__is_dynamic_entry(fmt))
+			break;
+
+		/*
+		 * If there's no field_sep, we still need
+		 * to display initial '  '.
+		 */
+		if (!sep || !first) {
+			ret = scnprintf(hpp->buf, hpp->size, "%s", sep ?: "  ");
+			advance_hpp(hpp, ret);
+		} else
+			first = false;
+
+		if (perf_hpp__use_color() && fmt->color)
+			ret = fmt->color(fmt, hpp, he);
+		else
+			ret = fmt->entry(fmt, hpp, he);
+
+		ret = hist_entry__snprintf_alignment(he, hpp, fmt, ret);
+		advance_hpp(hpp, ret);
+	}
+
+	if (sep)
+		ret = scnprintf(hpp->buf, hpp->size, "%s", sep);
+	else
+		ret = scnprintf(hpp->buf, hpp->size, "%*s",
+				(nr_sort_key - 1) * HIERARCHY_INDENT + 2, "");
+	advance_hpp(hpp, ret);
+
+	/*
+	 * No need to call hist_entry__snprintf_alignment() since this
+	 * fmt is always the last column in the hierarchy mode.
+	 */
+	fmt = he->fmt;
+	if (perf_hpp__use_color() && fmt->color)
+		fmt->color(fmt, hpp, he);
+	else
+		fmt->entry(fmt, hpp, he);
+
+	printed += fprintf(fp, "%s\n", buf);
+
+	if (symbol_conf.use_callchain && he->leaf) {
+		u64 total = hists__total_period(hists);
+
+		printed += hist_entry_callchain__fprintf(he, total, 0, fp);
+		goto out;
+	}
+
+out:
+	return printed;
+}
+
 static int hist_entry__fprintf(struct hist_entry *he, size_t size,
 			       struct hists *hists,
 			       char *bf, size_t bfsz, FILE *fp)
···
 
 	if (size == 0 || size > bfsz)
 		size = hpp.size = bfsz;
+
+	if (symbol_conf.report_hierarchy) {
+		int nr_sort = hists->hpp_list->nr_sort_keys;
+
+		return hist_entry__hierarchy_fprintf(he, &hpp, nr_sort,
+						     hists, fp);
+	}
 
 	hist_entry__snprintf(he, &hpp);
 
···
 		goto out;
 	}
 
-	for (nd = rb_first(&hists->entries); nd; nd = rb_next(nd)) {
+	for (nd = rb_first(&hists->entries); nd; nd = __rb_hierarchy_next(nd, HMD_FORCE_CHILD)) {
 		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
 		float percent;
 

tools/perf/util/hist.h

···
 	return __rb_hierarchy_next(node, HMD_NORMAL);
 }
 
+#define HIERARCHY_INDENT  3
+
 #endif	/* __PERF_HIST_H */