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authorSteven Rostedt <srostedt@redhat.com>2012-08-09 19:16:14 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-03-07 10:06:05 -0500
commit1d6bae966e90134bcfd7807b8f9488d55198de91 (patch)
tree201e59fd77c7569931197f78d7b75483ec88ffb5 /include/linux/ftrace_event.h
parent92550405c493a3c2fa14bf37d1d60cd6c7d0f585 (diff)
tracing: Move raw output code from macro to standalone function
The code for trace events to format the raw recorded event data into human readable format in the 'trace' file is repeated for every event in the system. When you have over 500 events, this can add up quite a bit. 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 12991007 1913568 9785344 24689919 178bcff /tmp/vmlinux.orig 12990946 1913568 9785344 24689858 178bcc2 /tmp/vmlinux.patched Note, this version does not save as much as the version of this patch I had a few years ago. That is because in the mean time, commit f71130de5c7f ("tracing: Add a helper function for event print functions") did a lot of the work my original patch did. But this change helps slightly, and is part of a larger clean up to reduce the size much further. Link: http://lkml.kernel.org/r/20120810034707.378538034@goodmis.org Cc: Li Zefan <lizefan@huawei.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace_event.h')
-rw-r--r--include/linux/ftrace_event.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index 4e4cc28623a..a91ab93d725 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -163,6 +163,8 @@ void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
void tracing_record_cmdline(struct task_struct *tsk);
+int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
+
struct event_filter;
enum trace_reg {
@@ -197,6 +199,9 @@ struct ftrace_event_class {
extern int ftrace_event_reg(struct ftrace_event_call *event,
enum trace_reg type, void *data);
+int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event,
+ char *fmt, ...);
+
enum {
TRACE_EVENT_FL_FILTERED_BIT,
TRACE_EVENT_FL_CAP_ANY_BIT,