Commit ef5580d0 authored by Steven Rostedt's avatar Steven Rostedt
Browse files

tracing: add interface to write into current tracer buffer 



Right now all tracers must manage their own trace buffers. This was
to enforce tracers to be independent in case we finally decide to
allow each tracer to have their own trace buffer.

But now we are adding event tracing that writes to the current tracer's
buffer. This adds an interface to allow events to write to the current
tracer buffer without having to manage its own. Since event tracing
has no "tracer", and is just a way to hook into any other tracer.

Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
parent 3d7ba938

kernel/trace/trace.c

+14 −0
Original line number Diff line number Diff line
@@ -846,6 +846,20 @@ void trace_buffer_unlock_commit(struct trace_array *tr, 
	trace_wake_up();

}



struct ring_buffer_event *

trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,

				  unsigned long flags, int pc)

{

	return trace_buffer_lock_reserve(&global_trace,

					 type, len, flags, pc);

}



void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,

					unsigned long flags, int pc)

{

	return trace_buffer_unlock_commit(&global_trace, event, flags, pc);

}



void

trace_function(struct trace_array *tr,

	       unsigned long ip, unsigned long parent_ip, unsigned long flags,

kernel/trace/trace.h

+6 −0
Original line number Diff line number Diff line
@@ -442,6 +442,12 @@ void trace_buffer_unlock_commit(struct trace_array *tr, 
				struct ring_buffer_event *event,

				unsigned long flags, int pc);



struct ring_buffer_event *

trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,

				  unsigned long flags, int pc);

void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,

					unsigned long flags, int pc);



struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,

						struct trace_array_cpu *data);

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