DiscardVirtualMemory function (memoryapi.h)
Discards the memory contents of a range of memory pages, without decommitting the memory. The contents of discarded memory is undefined and must be rewritten by the application.
Syntax
DWORD DiscardVirtualMemory(
[in] PVOID VirtualAddress,
[in] SIZE_T Size
);
Parameters
[in] VirtualAddress
Page-aligned starting address of the memory to discard.
[in] Size
Size, in bytes, of the memory region to discard. Size must be an integer multiple of the system page size.
Return value
ERROR_SUCCESS if successful; a System Error Code otherwise.
Remarks
If DiscardVirtualMemory fails, the contents of the region is not altered.
Use this function to discard memory contents that are no longer needed, while keeping the memory region itself committed. Discarding memory may give physical RAM back to the system. When the region of memory is again accessed by the application, the backing RAM is restored, and the contents of the memory is undefined.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 8.1 Update [desktop apps | UWP apps] |
| Minimum supported server | Windows Server 2012 R2 Update [desktop apps | UWP apps] |
| Target Platform | Windows |
| Header | memoryapi.h (include Windows.h, Memoryapi.h) |
| Library | onecore.lib |
| DLL | Kernel32.dll |