Unused Page Collection Scheme for Embedded Linux Operationg System

摘要

PURPOSE: A method for recovering the unused memory for an embedded Linux operating system is provided to prevent the short of the memory and to effectively handle the memory shortage by giving the control for the situation to a user even if the memory becomes severely short. CONSTITUTION: In case that the memory allocating request is occurred from a processor, the memory allocation is permitted if the usable memory resource is larger than the requested amount by confirming the amount of the usable memory resource remaining in a system. When the amount of the usable memory resource is less than a previously set minimum margin due to the previous memory allocation, a signal to request the return of the memory is sent to the operating processes. The processes receiving the signal return a part of the possessing memory to the system and the amount of the usable memory resource is increased.