core: only store the stack size for DEVELHELP

`tcp_t::stack_size` is only examined by the shell command `ps` and
`DEBUG_PRINT`. For the latter one only if `DEVELHELP` was enabled.

This PR guards the member `tcp_t::stack_size` in `#ifdef DEVELHELP`.
Only if DEVELHELP was activated its value get printed by `ps`.

Closes #1287.

core/include/tcb.h

@@ -72,7 +72,10 @@ typedef struct tcb_t {
 
     const char *name;           /**< thread's name                  */
     char *stack_start;          /**< thread's stack start address   */
+
+#ifdef DEVELHELP
     int stack_size;             /**< thread's stack size            */
+#endif
 } tcb_t;
 
 #endif /* TCB_H_ */

core/thread.c

@@ -109,7 +109,9 @@ int thread_measure_stack_free(char *stack)
 kernel_pid_t thread_create(char *stack, int stacksize, char priority, int flags, void *(*function)(void *arg), void *arg, const char *name)
 {
     /* allocate our thread control block at the top of our stackspace */
+#ifdef DEVELHELP
     int total_stacksize = stacksize;
+#endif
     stacksize -= sizeof(tcb_t);
 
     /* align tcb address on 32bit boundary */
@@ -174,7 +176,10 @@ kernel_pid_t thread_create(char *stack, int stacksize, char priority, int flags,
 
     cb->sp = thread_stack_init(function, arg, stack, stacksize);
     cb->stack_start = stack;
+
+#ifdef DEVELHELP
     cb->stack_size = total_stacksize;
+#endif
 
     cb->priority = priority;
     cb->status = 0;

sys/ps/ps.c

@@ -41,9 +41,15 @@ void thread_print_all(void)
 {
     const char queued_name[] = {'_', 'Q'};
     int i;
-    int overall_stacksz = 0;
+#ifdef DEVELHELP
+    int overall_stacksz = 0, overall_used = 0;
+#endif
 
-    printf("\tpid | %-21s| %-9sQ | pri | stack ( used) location"
+    printf("\tpid | %-21s| %-9sQ | pri | "
+#ifdef DEVELHELP
+           "stack ( used) "
+#endif
+           "location"
 #if SCHEDSTATISTICS
            "  | runtime | switches"
 #endif
@@ -57,19 +63,30 @@ void thread_print_all(void)
             int state = p->status;                                                 /* copy state */
             const char *sname = state_names[state];                                /* get state name */
             const char *queued = &queued_name[(int)(state >= STATUS_ON_RUNQUEUE)]; /* get queued flag */
+#ifdef DEVELHELP
             int stacksz = p->stack_size;                                           /* get stack size */
-#if SCHEDSTATISTICS
-            int runtime_ticks = sched_pidlist[i].runtime_ticks / (hwtimer_now()/1000UL + 1);
-            int switches = sched_pidlist[i].schedules;
-#endif
             overall_stacksz += stacksz;
             stacksz -= thread_measure_stack_free(p->stack_start);
-            printf("\t%3" PRIkernel_pid " | %-21s| %-8s %.1s | %3i | %5i (%5i) %p"
+            overall_used += stacksz;
+#endif
 #if SCHEDSTATISTICS
-                   " | %4d/1k |  %8d"
+            double runtime_ticks =  sched_pidlist[i].runtime_ticks / (double) hwtimer_now() * 100;
+            int switches = sched_pidlist[i].schedules;
+#endif
+            printf("\t%3u | %-21s| %-8s %.1s | %3i | "
+#ifdef DEVELHELP
+                   "%5i (%5i) "
+#endif
+                   "%p"
+#if SCHEDSTATISTICS
+                   " | %6.3f%% |  %8d"
 #endif
                    "\n",
-                   p->pid, p->name, sname, queued, p->priority, p->stack_size, stacksz, p->stack_start
+                   p->pid, p->name, sname, queued, p->priority,
+#ifdef DEVELHELP
+                   p->stack_size, stacksz,
+#endif
+                   p->stack_start
 #if SCHEDSTATISTICS
                    , runtime_ticks, switches
 #endif
@@ -77,5 +94,8 @@ void thread_print_all(void)
         }
     }
 
-    printf("\t%5s %-21s|%13s%6s %5i\n", "|", "SUM", "|", "|", overall_stacksz);
+#ifdef DEVELHELP
+    printf("\t%5s %-21s|%13s%6s %5i (%5i)\n", "|", "SUM", "|", "|",
+           overall_stacksz, overall_used);
+#endif
 }