perf tools: Add overhead/overhead_children keys defaults via string

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 be able to add
support for hists specific sort keys.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Noel Grandin <noelgrandin@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1452158050-28061-12-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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);