Unix Memory Management question and answer for interview
1. What is a Map? A Map is an Array, which contains the addresses of the free space in the swap device that are allocatable resources, and the number of the resource units available there. Address Units 1 10,000 This allows First-Fit allocation of contiguous blocks of a resource. Initially the Map contains one entry - address (block offset from the starting of the swap area) and the total number of resources. Kernel treats each unit of Map as a group of disk blocks. On the allocation and freeing of the resources Kernel updates the Map for accurate information. 2. What do you mean by u-area (user area) or u-block? This contains the private data that is manipulated only by the Kernel. This is local to the Process, i.e. each process is allocated a u-area.
