trace_stat: keep original order

Impact: make trace_stat files show items with the original order

trace_stat tracer reverse the items, it makes the output
looks a little ugly.

Example, when we read trace_stat/workqueues, we get cpu#7's stat.
at first, and then cpu#6... cpu#0.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Steven Rostedt <srostedt@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <49C9F23F.5040307@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 8 insertions, 10 deletions

diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index 8c129dd480ad..acdebd771a93 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -125,23 +125,21 @@ static int stat_seq_init(struct tracer_stat_session *session)
                 INIT_LIST_HEAD(&new_entry->list);
                 new_entry->stat = stat;
 
-                list_for_each_entry(iter_entry, &session->stat_list, list) {
+                list_for_each_entry_reverse(iter_entry, &session->stat_list,
+                                list) {
 
                         /* Insertion with a descendent sorting */
-                        if (ts->stat_cmp(new_entry->stat,
-                                                iter_entry->stat) > 0) {
+                        if (ts->stat_cmp(iter_entry->stat,
+                                        new_entry->stat) >= 0) {
 
-                                list_add_tail(&new_entry->list,
-                                                &iter_entry->list);
-                                break;
-
-                        /* The current smaller value */
-                        } else if (list_is_last(&iter_entry->list,
-                                                &session->stat_list)) {
                                 list_add(&new_entry->list, &iter_entry->list);
                                 break;
                         }
                 }
+
+                /* The current larger value */
+                if (list_empty(&new_entry->list))
+                        list_add(&new_entry->list, &session->stat_list);
         }
 exit:
         mutex_unlock(&session->stat_mutex);