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tracing: Move event storage for array from macro to standalone function

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The code that shows array fields for events is defined for all events.
This can add up quite a bit when you have over 500 events.

By making helper functions in the core kernel to do the work
instead, we can shrink the size of the kernel down a bit.

With a kernel configured with 502 events, the change in size was:

   text    data     bss     dec     hex filename
12990946        1913568 9785344 24689858        178bcc2 /tmp/vmlinux
12987390        1913504 9785344 24686238        178ae9e /tmp/vmlinux.patched

That's a total of 3556 bytes, which comes down to 7 bytes per event.
Although it's not much, this code is just called at initialization of
the events.

Link: http://lkml.kernel.org/r/20120810034708.084036335@goodmis.org

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2012-08-09 22:26:46 -04:00 • committed by Steven Rostedt
parent 1d6bae966e
commit 35bb4399bd
5 changed files with 33 additions and 26 deletions
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8
include/linux/ftrace_event.h
View file

@ -202,6 +202,10 @@ extern int ftrace_event_reg(struct ftrace_event_call *event,
int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event,
char *fmt, ...);
int ftrace_event_define_field(struct ftrace_event_call *call,
char *type, int len, char *item, int offset,
int field_size, int sign, int filter);
enum {
TRACE_EVENT_FL_FILTERED_BIT,
TRACE_EVENT_FL_CAP_ANY_BIT,
@ -500,10 +504,6 @@ enum {
FILTER_TRACE_FN,
};
#define EVENT_STORAGE_SIZE 128
extern struct mutex event_storage_mutex;
extern char event_storage[EVENT_STORAGE_SIZE];
extern int trace_event_raw_init(struct ftrace_event_call *call);
extern int trace_define_field(struct ftrace_event_call *call, const char *type,
const char *name, int offset, int size,