[MINOR] show sess: report number of calls to each task

For debugging purposes, it can be useful to know how many times each
task has been called.

include/proto/task.h

@@ -173,6 +173,7 @@ static inline struct task *task_init(struct task *t)
 	t->rq.node.leaf_p = NULL;
 	t->state = TASK_SLEEPING;
 	t->nice = 0;
+	t->calls = 0;
 	return t;
 }
 

include/types/task.h

@@ -50,6 +50,7 @@ struct task {
 	struct eb32_node rq;		/* ebtree node used to hold the task in the run queue */
 	int state;			/* task state : bit field of TASK_* */
 	int expire;			/* next expiration date for this task, in ticks */
+	unsigned int calls;		/* number of times ->process() was called */
 	struct task * (*process)(struct task *t);  /* the function which processes the task */
 	void *context;			/* the task's context */
 	int nice;			/* the task's current nice value from -1024 to +1024 */

src/dumpstats.c

@@ -1209,10 +1209,11 @@ void stats_dump_sess_to_buffer(struct session *s, struct buffer *rep)
 			}
 
 			chunk_printf(&msg, sizeof(trash),
-				     " si=(%d,%d) as=%d ts=%02x age=%s",
+				     " si=(%d,%d) as=%d ts=%02x age=%s calls=%d",
 				     curr_sess->si[0].state, curr_sess->si[1].state,
 				     curr_sess->ana_state, curr_sess->task->state,
-				     human_time(now.tv_sec - curr_sess->logs.tv_accept.tv_sec, 1));
+				     human_time(now.tv_sec - curr_sess->logs.tv_accept.tv_sec, 1),
+				     curr_sess->task->calls);
 
 			if (task_in_rq(curr_sess->task))
 				chunk_printf(&msg, sizeof(trash), " run(nice=%d)\n", curr_sess->task->nice);

src/task.c

@@ -219,6 +219,7 @@ void process_runnable_tasks(int *next)
 		/* This is an optimisation to help the processor's branch
 		 * predictor take this most common call.
 		 */
+		t->calls++;
 		if (likely(t->process == process_session))
 			t = process_session(t);
 		else