This means, on average, that each mapping wastes half the page size in physical memory for each mapping.
Is that really correct ? If there is an allocation several pages long then the last page will be, on average, 1/2 wasted.
Look at the example a bit later, the first memory size is 0x0132ac (78508 decimal) which is 19 (4k sized) pages and 684 bytes, so 3412 out of 78508 bytes wasted = 4%.
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