mm/heap: add MM_BACKTRACE_DEFAULT to config backtrace record by default

Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>

mm/Kconfig

@@ -186,4 +186,9 @@ config MM_KASAN
 		bugs in native code. After turn on this option, Please
 		add -fsanitize=kernel-address to CFLAGS/CXXFLAGS too.
 
+config MM_BACKTRACE_DEFAULT
+	bool "Enable the backtrace record by default"
+	default n
+	depends on DEBUG_MM
+
 source "mm/iob/Kconfig"

mm/mm_heap/mm_initialize.c

@@ -213,6 +213,9 @@ FAR struct mm_heap_s *mm_initialize(FAR const char *name,
 #if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
   heap->mm_procfs.name = name;
   heap->mm_procfs.heap = heap;
+#if defined (CONFIG_DEBUG_MM) && defined(CONFIG_MM_BACKTRACE_DEFAULT)
+  heap->mm_procfs.backtrace = true;
+#endif
   procfs_register_meminfo(&heap->mm_procfs);
 #endif
 #endif