--- mm/Kconfig
+++ mm/Kconfig
@@ -1,3 +1,23 @@
+config VM_DIRTY_RATIO
+ int "vm_dirty_ratio"
+ default 15
+ help
+
+config VM_DIRTY_BACKGROUND_RATIO
+ int "vm_dirty_background_ratio"
+ default 3
+ help
+
+config VM_DIRTY_WRITBACK_INT
+ int "vm_dirty_writeback_interval"
+ default 500
+ help
+
+config VM_DIRTY_EXPIRE_INT
+ int "vm_dirty_expure_interval"
+ default 3000
+ help
+
config SELECT_MEMORY_MODEL
def_bool y
depends on EXPERIMENTAL || ARCH_SELECT_MEMORY_MODEL