A Page Frame Structure (PF) is used by page frame management to track the status of a physical storage frame. The Page Frame Structures are allocated in contiguous storage, anchored from the address specified in global variable: 
_pft

Each PF corresponds one to one with a frame of physical storage and provides links to Virtual Page Structures (VPs).

Zero or more PTEs may be pinned to a physical frame, this is reflected in a reference count maintained in the associated PF.

UVIRT mappings have their corresponding PFs reserved unless aliased by non-UVIRT storage.

Refer to the following for more detailed information

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