page table entry in linux virtual memory managment

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if a pte's present bit is clear, how does the kernel know where it lies in harddisk, and transfer it back to physic memory. Yes i know the LBA mode of harddisk which says all memory can be accessed by their ordinal,but nowadays 500G is a common capacity of harddisk,the address line of 80x86 is 32,which addrss up to 4GB,then how does it deal whith 500G or 1TB,and differenciate with the physical address space?
Thanks advance!

Posted 23-Jun-13 9:11am

xiahan1994

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-06-23T10:01:00

Solution 1

Who told you that the position in file streams are 32-bit? Usually, uint64 type is used for that. Of course, you cannot always map the whole file onto physical memory, but you don't really need it, even in 64-bit instruction-set architectures which also use uint64 pointers in flat memory space.

—SA

Posted 23-Jun-13 10:01am

Sergey Alexandrovich Kryukov

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xiahan1994 23-Jun-13 16:52pm

do you mean their has 64 addree lines or only a little address lines but send the address where the file located in harddisk several times in address line? just like if there is 32 address lines and the address is specified use uint64 type so we send the address twice.

Sergey Alexandrovich Kryukov 23-Jun-13 23:44pm

What address? Stream position is 64-bit number. If you want, call it "address". There is not such thing as 32-bit "address".
—SA