Commit b0aae68c authored May 21, 2009 by Li Zefan Committed by Frederic Weisbecker May 26, 2009

tracing/events: change the type of __str_loc_item to unsigned short



When defining a dynamic size string, we add __str_loc_##item to the
trace entry, and it stores the location of the actual string in
entry->_str_data[]

'unsigned short' should be sufficient to store this information, thus
we save 2 bytes per dyn-size string in the ring buffer.

[ Impact: reduce memory occupied by dyn-size strings in ring buffer ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <4A14EDB6.2050507@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

parent 4f535968

include/trace/ftrace.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -25,7 +25,7 @@
		#define __field(type, item) type item;

		#undef __string
		#define __string(item, src) int __str_loc_##item;
		#define __string(item, src) unsigned short __str_loc_##item;

		#undef TP_STRUCT__entry
		#define TP_STRUCT__entry(args...) args