* Changed the profiling API: Instead of sending all functions that shall

be tracked to the kernel, which then counts the hits, an area is
  passed to kernel in which the hits are recorded. When the area is
  full, the debugger is notified. For some reason that part doesn't work
  yet -- the whole system freezes when waiting for a reply.
* Reorganized the profile tool code a bit. For one with respect to the
  changed API, but also to prepare tracking of image creation/deletion.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27640 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/kernel/debugger.h

@@ -171,8 +171,8 @@ typedef enum {
 	B_DEBUGGER_MESSAGE_IMAGE_CREATED,		// an image has been created
 	B_DEBUGGER_MESSAGE_IMAGE_DELETED,		// an image has been deleted
 
-	B_DEBUGGER_MESSAGE_PROFILER_STOPPED,	// a profiled thread is going to
-											// exit
+	B_DEBUGGER_MESSAGE_PROFILER_UPDATE,		// flush the profiling buffer for a
+											// thread
 
 	B_DEBUGGER_MESSAGE_HANDED_OVER,			// the debugged team has been
 											// handed over to another debugger
@@ -363,13 +363,18 @@ typedef struct {
 	port_id				reply_port;		// port to send the reply to
 	thread_id			thread;			// thread to profile
 	bigtime_t			interval;		// sample interval
-	int32				function_count;	// number of functions we count hits for
-	struct debug_profile_function functions[1];
-		// functions that shall be tracked
+	area_id				sample_area;	// area into which the sample will be
+										// written
+	int32				stack_depth;	// number of return address per hit
 } debug_nub_start_profiler;
 
 typedef struct {
 	status_t			error;
+	int32				profile_event;	// number of the last event influencing
+										// profiling (e.g. image
+										// created/deleted)
+	bigtime_t			interval;		// actual sample interval (might
+										// differ from the requested one)
 } debug_nub_start_profiler_reply;
 
 // B_DEBUG_STOP_PROFILER
@@ -379,7 +384,7 @@ typedef struct {
 	thread_id			thread;			// thread to profile
 } debug_nub_stop_profiler;
 
-// reply is debug_profiler_stopped
+// reply is debug_profiler_update
 
 // union of all messages structures sent to the debug nub thread
 typedef union {
@@ -532,17 +537,21 @@ typedef struct {
 	image_info		info;			// info for the image
 } debug_image_deleted;
 
-// B_DEBUGGER_MESSAGE_PROFILER_STOPPED
+// B_DEBUGGER_MESSAGE_PROFILER_UPDATE
 
 typedef struct {
 	debug_origin		origin;
-	int32				function_count;
-	bigtime_t			interval;			// actual sample interval (might
-											// differ from the requested one)
-	int64				total_ticks;		// total number of sample ticks
-	int64				missed_ticks;		// ticks that didn't hit a function
-	int64				function_ticks[1];	// number of hits for each function
-} debug_profiler_stopped;
+	int32				profile_event;		// number of the last event
+											// influencing profiling (e.g.
+											// image created/deleted); all
+											// samples were recorded after this
+											// event and before the next one
+	int32				stack_depth;		// number of return addresses per
+											// tick
+	int32				sample_count;		// number of samples in the buffer
+	bool				stopped;			// if true, the thread is no longer
+											// being profiled
+} debug_profiler_update;
 
 // B_DEBUGGER_MESSAGE_HANDED_OVER
 
@@ -570,7 +579,7 @@ typedef union {
 	debug_thread_deleted			thread_deleted;
 	debug_image_created				image_created;
 	debug_image_deleted				image_deleted;
-	debug_profiler_stopped			profiler_stopped;	// dynamic size!
+	debug_profiler_update			profiler_update;
 	debug_handed_over				handed_over;
 
 	debug_origin					origin;	// for convenience (no real message)