sched: add STACK_USAGE_SAFE_PERCENT for stack overflow check

Change-Id: Ia70e243b36401e28c31fcd7e1b480b79374c27ef
Signed-off-by: ligd <liguiding1@xiaomi.com>

Kconfig

@@ -1758,6 +1758,18 @@ config STACK_COLORATION
 
 		Only supported by a few architectures.
 
+config STACK_USAGE_SAFE_PERCENT
+	int "Stack usage safe precent"
+	default 0
+	range 0 100
+	depends on STACK_COLORATION
+	---help---
+		Stack usage precent = up_check_tcbstack() * 100 / tcb->adj_stack_size,
+		this should lower then STACK_USAGE_SAFE_PERCENT.
+		Idle thread will timely check stack usage when this marco value > 0.
+
+		N.B. This feature should not be used in production code.
+
 config STACK_CANARIES
 	bool "Compiler stack canaries"
 	depends on ARCH_HAVE_STACKCHECK

sched/init/nx_start.c

@@ -800,7 +800,7 @@ void nx_start(void)
   sinfo("CPU0: Beginning Idle Loop\n");
   for (; ; )
     {
-#if defined(CONFIG_STACK_COLORATION) && defined(CONFIG_DEBUG_MM)
+#if defined(CONFIG_STACK_COLORATION) && CONFIG_STACK_USAGE_SAFE_PERCENT > 0
 
       /* Check stack in idle thread */
 
@@ -812,7 +812,8 @@ void nx_start(void)
           flags = enter_critical_section();
 
           tcb = g_pidhash[i].tcb;
-          if (tcb && up_check_tcbstack_remain(tcb) <= 0)
+          if (tcb && (up_check_tcbstack(tcb) * 100 / tcb->adj_stack_size
+                      > CONFIG_STACK_USAGE_SAFE_PERCENT))
             {
               _alert("Stack check failed, pid %d, name %s\n",
                       tcb->pid, tcb->name);