Abstract: Using virtual storage technology in Linux Operating System,apage fault is triggered when the requested page is not in memory,which results in uncertain delay that cannot meet the requirements of real-time application.In addition,with the case of large amounts of data transmission between user mode and kernel mode,the generic Linux system cannot meet the demand of real-time applications.To solve these problems,this paper studies the Linux memory management firstly,and then using memory-mapped technology to solve the page fault problem in virtual memory management and to share a physical memory for user mode and kernel mode,which aim at meeting the requirements of real-time application.In the last part,this study will test and compare the performance of the memory mapping techniques to achieve real-time memory.The test results show that the technology can provide real-time memory for real-time applications effectively.