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Written by:

Demetrius H


Date added:

August 2, 2014








No of pages / words:

4 / 864


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At this point the Virtual Memory Manager (VMM) knows it needs to get data from disk and place it in RAM - it therefore checks to see that there is space in RAM in which to out this data. If there's enough room, VMM checks to see if the wanted page has been used previously by this process: - if not, an "initial page fault", VMM allocates _two_ pages for the data; one in RAM and the other on a backing page on disk where it can go if it has to be temporarily removed from RAM...
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This is known as "late page space allocation". - if it has, a "repage fault" I/O is scheduled to bring the data back from disk and into RAM - the act of resolving this repage fault is called a "page-in" (the process that is waiting for this to happen is in a "page wait state"). So what happens if there's not enough room in RAM to put the page? Well the page stealer is there to ensure that there is a supply of free RAM pages available for an initial page fault...
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