[PATCH 1/2] perf, tools: Group alias perf list by section

[Andi Kleen <andi@firstfloor.org>]

From: Andi Kleen <ak@linux.intel.com>

The first first element in an hardware event name defines the general
area, usually the part of the micro architecture it is refering to.
Group the perf list output by these sections by adding section headers.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/util/pmu.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 578a537..ba50300 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -982,6 +982,8 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag)
 	struct pair *aliases;
 	int numdesc = 0;
 	int columns = pager_get_columns();
+	const char *last_section;
+	int last_section_len;
 
 	pmu = NULL;
 	len = 0;
@@ -1029,6 +1031,8 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag)
 		}
 	}
 	len = j;
+	last_section = NULL;
+	last_section_len = 0;
 	qsort(aliases, len, sizeof(struct pair), cmp_pair);
 	for (j = 0; j < len; j++) {
 		if (name_only) {
@@ -1036,8 +1040,21 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag)
 			continue;
 		}
 		if (aliases[j].desc && !quiet_flag) {
+			char *dot;
+			char *name = aliases[j].name;
+
 			if (numdesc++ == 0)
 				printf("\n");
+			dot = strchr(name, '.');
+			if (dot &&
+				(!last_section ||
+				 strncmp(last_section, name, last_section_len))) {
+				last_section_len = dot - name;
+				printf("%s%.*s:\n",
+						last_section ? "\n" : "",
+						last_section_len, name);
+				last_section = name;
+			}
 			printf("  %-50s\n", aliases[j].name);
 			printf("%*s", 8, "[");
 			wordwrap(aliases[j].desc, 8, columns, 0);
-- 
2.1.0