Description: Linux system call mlock code analysis, LINUX, Each user process can visit the linear 4 GB of virtual memory space. Them from 0-3 GB of virtual memory address space users, users can direct the process of their visit. From 3 GB to 4 GB of virtual memory address space at the core, the core is for storing state visit to the code and data user process can not visit. When the user through the process of interruption or system call their visit, Processor will trigger the conversion privilege level (from the privileged class processors switched to the three-level privileges 0), from the operating system users switched to the core state.
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