Because OS runs very frequently, and it would be wasteful to store it back to disk and load again.
Resource allocation, memory management, managing device access
Through virtual memory. VM allocates virtual pages to physical pages in a disjoint manner and only the OS can manipulate the page table entries.
Latency: The time to finish a task
Throughput: The number of tasks finished per unit of time
Because addresses are virtual, and you must get virtual to physical memory mapping from the page table first which is also in the memory. So, to access memory, you must access memory once for the page table and then for the actual access.
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