The NPAGED_LOOKASIDE_LIST structure is an opaque structure that describes a lookaside list of fixed-size buffers allocated from nonpaged pool. The system creates new entries and destroys unused entries on the list as necessary. For fixed-size buffers, using a lookaside list is quicker than allocating memory directly.
Use ExInitializeNPagedLookasideList to initialize the lookaside list. Use ExAllocateFromNPagedLookasideList to allocate a buffer from the list, and ExFreeToNPagedLookasideList to return a buffer to the list.
Drivers must always explicitly free any lookaside lists they create before unloading. It is a serious programming error to do otherwise. Use ExDeleteNPagedLookasideList to free the list.
Drivers can also use lookaside lists for paged pool. Starting with Windows 2000, a PAGED_LOOKASIDE_LIST structure describes a lookaside list that contains paged buffers. Starting with Windows Vista, a LOOKASIDE_LIST_EX structure can describe a lookaside list that contains either paged or nonpaged buffers. For more information, see Using Lookaside Lists.
On 64-bit platforms, this structure must be 16-byte aligned.
Supported starting with Windows 2000.