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But why does it work that way, why does all memory need to be mapped before allocation? why can't it work like file systems where you have a table/datastructure mapping inodes to files? The smaller your allocations are, the less total ram you have, that would make sense. Some apps need huge chunks of memory, some don't, why the one-size-fits-all approach? TLB lookup can also be O(n), it will be slower when you have lots of small allocations because that means lots of lookups but that lets applications optimize performance that way instead of having it be a system-wide setting.