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

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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>
This commit is contained in:
Li Zefan 2009-05-21 13:59:18 +08:00 committed by Frederic Weisbecker
parent 4f5359685a
commit b0aae68cc5
1 changed files with 1 additions and 1 deletions
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2
include/trace/ftrace.h
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@ -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