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| author |   Li Zefan <lizf@cn.fujitsu.com> | 2009-05-21 13:59:18 +0800 |
|---|---|---|
| committer |   Frederic Weisbecker <fweisbec@gmail.com> | 2009-05-26 00:15:21 +0200 |
| commit | b0aae68cc5508f3c2fbf728988c954db4c8b8a53 (patch) | |
| tree | af1253c54cf3edc83806acab14a60d1529e81709 /include/trace | |
| parent | tracing: add trace_event_read_lock() (diff) | |
| download | linux-dev-b0aae68cc5508f3c2fbf728988c954db4c8b8a53.tar.xz linux-dev-b0aae68cc5508f3c2fbf728988c954db4c8b8a53.zip | |
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>
Diffstat (limited to 'include/trace')
| -rw-r--r-- | include/trace/ftrace.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h index edb02bc9f8ff..b5ff2e8229ec 100644 --- a/include/trace/ftrace.h +++ b/include/trace/ftrace.h @@ -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 |