[PATCH 11/13] perf tools: Add overhead/overhead_children keys defaults via string

[Jiri Olsa <jolsa@kernel.org>]

We currently set 'overhead' and 'overhead_children'
as default sort keys within perf_hpp__init function
by directly adding into the sort list.

This patch adds 'overhead' and 'overhead_children'
in text form into sort_keys and let them be added
by standard sort dimension interface.

We need to eliminate dirrect sort_list additions to
b able to add support for hists specific sort keys.

Link: http://lkml.kernel.org/n/tip-thk6jds1pi6j2jy82ywnxniy@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/ui/hist.c   | 12 ------------
 tools/perf/util/sort.c | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 12 deletions(-)

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 8263c0eb9fb5..bf2a66e254ea 100644
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -443,7 +443,6 @@ LIST_HEAD(perf_hpp__sort_list);
 
 void perf_hpp__init(void)
 {
-	struct list_head *list;
 	int i;
 
 	for (i = 0; i < PERF_HPP__MAX_INDEX; i++) {
@@ -484,17 +483,6 @@ void perf_hpp__init(void)
 
 	if (symbol_conf.show_total_period)
 		hpp_dimension__add_output(PERF_HPP__PERIOD);
-
-	/* prepend overhead field for backward compatiblity.  */
-	list = &perf_hpp__format[PERF_HPP__OVERHEAD].sort_list;
-	if (list_empty(list))
-		list_add(list, &perf_hpp__sort_list);
-
-	if (symbol_conf.cumulate_callchain) {
-		list = &perf_hpp__format[PERF_HPP__OVERHEAD_ACC].sort_list;
-		if (list_empty(list))
-			list_add(list, &perf_hpp__sort_list);
-	}
 }
 
 void perf_hpp__column_register(struct perf_hpp_fmt *format)
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 04e2a5cb19e3..ec722346e6ff 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2252,6 +2252,34 @@ static int setup_sort_order(struct perf_evlist *evlist)
 	return 0;
 }
 
+/*
+ * Adds 'pre,' prefix into 'str' is 'pre' is
+ * not already part of 'str'.
+ */
+static char *prefix_if_not_in(const char *pre, char *str)
+{
+	char *n;
+
+	if (!str || strstr(str, pre))
+		return str;
+
+	if (asprintf(&n, "%s,%s", pre, str) < 0)
+		return NULL;
+
+	free(str);
+	return n;
+}
+
+static char *setup_overhead(char *keys)
+{
+	keys = prefix_if_not_in("overhead", keys);
+
+	if (symbol_conf.cumulate_callchain)
+		keys = prefix_if_not_in("overhead_children", keys);
+
+	return keys;
+}
+
 static int __setup_sorting(struct perf_evlist *evlist)
 {
 	char *tmp, *tok, *str;
@@ -2281,6 +2309,17 @@ static int __setup_sorting(struct perf_evlist *evlist)
 		return -ENOMEM;
 	}
 
+	/*
+	 * Prepend overhead fields for backward compatibility.
+	 */
+	if (!is_strict_order(field_order)) {
+		str = setup_overhead(str);
+		if (str == NULL) {
+			error("Not enough memory to setup overhead keys");
+			return -ENOMEM;
+		}
+	}
+
 	for (tok = strtok_r(str, ", ", &tmp);
 			tok; tok = strtok_r(NULL, ", ", &tmp)) {
 		ret = sort_dimension__add(tok, evlist);
-- 
2.4.3