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authorSteven Rostedt2012-08-09 22:42:57 -0400
committerSteven Rostedt2014-03-07 10:06:07 -0500
commit3fd40d1ee6a317523172ab95b6f7ea41ba8fcee3 (patch)
treeb6703da042d877c047136cd4fc3263b1ffccd20d /include/trace
parent35bb4399bd0ef16b8a57fccea0047d98b6b0e7fb (diff)
tracing: Use helper functions in event assignment to shrink macro size
The functions that assign the contents for the ftrace events are defined by the TRACE_EVENT() macros. Each event has its own unique way to assign data to its buffer. When you have over 500 events, that means there's 500 functions assigning data uniquely for each event (not really that many, as DECLARE_EVENT_CLASS() and multiple DEFINE_EVENT()s will only need a single function). By making helper functions in the core kernel to do some of 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 12987390 1913504 9785344 24686238 178ae9e /tmp/vmlinux 12959102 1913504 9785344 24657950 178401e /tmp/vmlinux.patched That's a total of 28288 bytes, which comes down to 56 bytes per event. Link: http://lkml.kernel.org/r/20120810034708.370808175@goodmis.org Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/ftrace.h22
1 files changed, 6 insertions, 16 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 54928faf2119..1cc2265caa52 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -532,37 +532,27 @@ static notrace void \
ftrace_raw_event_##call(void *__data, proto) \
{ \
struct ftrace_event_file *ftrace_file = __data; \
- struct ftrace_event_call *event_call = ftrace_file->event_call; \
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
- struct ring_buffer_event *event; \
+ struct ftrace_event_buffer fbuffer; \
struct ftrace_raw_##call *entry; \
- struct ring_buffer *buffer; \
- unsigned long irq_flags; \
int __data_size; \
- int pc; \
\
if (ftrace_trigger_soft_disabled(ftrace_file)) \
return; \
\
- local_save_flags(irq_flags); \
- pc = preempt_count(); \
- \
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
\
- event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, \
- event_call->event.type, \
- sizeof(*entry) + __data_size, \
- irq_flags, pc); \
- if (!event) \
+ entry = ftrace_event_buffer_reserve(&fbuffer, ftrace_file, \
+ sizeof(*entry) + __data_size); \
+ \
+ if (!entry) \
return; \
- entry = ring_buffer_event_data(event); \
\
tstruct \
\
{ assign; } \
\
- event_trigger_unlock_commit(ftrace_file, buffer, event, entry, \
- irq_flags, pc); \
+ ftrace_event_buffer_commit(&fbuffer); \
}
/*
* The ftrace_test_probe is compiled out, it is only here as a build time check