tracing/filters: Defer pred allocation

init_preds() allocates about 5392 bytes of memory (on x86_32) for
a TRACE_EVENT. With my config, at system boot total memory occupied
is:

	5392 * (642 + 15) == 3459KB

642 == cat available_events | wc -l
15 == number of dirs in events/ftrace

That's quite a lot, so we'd better defer memory allocation util
it's needed, that's when filter is used.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
LKML-Reference: <4A9B8EA5.6020700@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 57c56a998ee6..bfbc842600a1 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -622,7 +622,6 @@ static int ftrace_raw_init_event_##call(void)				\
                 return -ENODEV;                                         \
         event_##call.id = id;                                           \
         INIT_LIST_HEAD(&event_##call.fields);                           \
-        init_preds(&event_##call);                                      \
         return 0;                                                       \
 }                                                                       \
                                                                         \