MI_PAGING_FILE_SPACE_BITMAPS

The MI_PAGING_FILE_SPACE_BITMAPS structure holds the state of two bitmaps that the Memory Manager uses to track pages in a paging file. The structure was introduced for Windows 8 to tidy some changes that started with Windows 7. Since ancient times the MMPAGING_FILE structure had one RTL_BITMAP, named simply Bitmap, which tracked the allocated pages. Windows 7 gave it a second, the EvictStoreBitmap. When Windows 8 added a third, the ReservationBitmap, it collected the lot as the MI_PAGING_FILE_SPACE_BITMAPS.

Variability

As an internal structure, it varies between versions. Time will tell how much. So far, there has been just the one change, for Windows 10.

Layout

union {
    ULONG RefCount;
    MI_PAGING_FILE_SPACE_BITMAPS *Anchor;
};

RTL_BITMAP AllocationBitmap;

RTL_BITMAP ReservationBitmap;

union {
    RTL_BITMAP ReservationBitmap;
    RTL_BITMAP EvictedBitmap;
};

RTL_BITMAP *EvictStoreBitmap;