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WinAPI memory usage specification

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Hello. I am trying to use the WinAPI PROCESS_MEMORY_COUNTERS structure to determine the total (virtual) memory used by the process. The documentation (http://msdn2.microsoft.com/en-us/library/ms684877.aspx) is far from precise unfortunately. I assume that "WorkingSetSize" is the size of the pages present in the RAM only. For "PagefileUsage" it states "The current space allocated for the pagefile, in bytes. Those pages may or may not be in memory.", which appears to be a contradiction to its name. So is "PagefileUsage" the total used memory? If not, was is it? Thanks for your help!

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