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The memory (RAM) size requirement of mobile devices significantly affect both the production cost and the customer usability. As the execution environments include more processes (background services and system daemons), and the on-board hardware requires more memory allocated exclusively, the free memory usable to user applications, which also requires more memory these days, may shrink if the manufactorer does not increase the memory size extremely more. However, for low-mid budget devices, we cannot increase the memory size much (e.g., 2GB). We present how we have implemented and utilized Linux kernel memory management features for Tizen in order to use Tizen platform with limited memory spaces.