Paging

• Logical address space of a process can be noncontiguous; process is allocated physical memory whenever the latter is available.
• Divide physical memory into fixed-sized blocks called frames (size is power of 2, between 512 bytes and 8192 bytes).
• Divide logical memory into blocks of same size called pages.
• Keep track of all free frames.
• To run a program of size n pages, need to find n free frames and load program.
• Set up a page table to translate logical to physical addresses.
• Internal fragmentation.