_MM_POOL_PRIORITIES

Windows 10 1511 (November Update, Threshold 2)
Windows 10 1607 (Anniversary Update, Redstone 1)
Windows 10 1703 (Creators Update, Redstone 2)
//0x4 bytes (sizeof)
enum _MM_POOL_PRIORITIES
{
    MmHighPriority = 0,
    MmNormalPriority = 1,
    MmLowPriority = 2,
    MmMaximumPoolPriority = 3
};