tracing/filter: Allocate the preds in an array

Currently we allocate an array of pointers to filter_preds, and then
allocate a separate filter_pred for each item in the array.
This adds slight overhead in the filters as it needs to derefernce
twice to get to the op condition.

Allocating the preds themselves in a single array removes a dereference
as well as helps on the cache footprint.

Cc: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 441fc1bc85d6..254d04a84ec3 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -663,7 +663,7 @@ struct ftrace_event_field {
 struct event_filter {
         int                     n_preds;        /* Number assigned */
         int                     a_preds;        /* allocated */
-        struct filter_pred      **preds;
+        struct filter_pred      *preds;
         char                    *filter_string;
 };