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mdbx: dynamically discarding unused tail pages of DB file.

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Change-Id: I1a0eee50cd27de26521e65c9f7ea51a527a0424e
This commit is contained in:
Leonid Yuriev
2019-08-28 04:57:07 +03:00
parent 327e5feb97
commit 51e7159f36
4 changed files with 82 additions and 34 deletions
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13
src/lck-windows.c
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@@ -663,11 +663,21 @@ MDBX_srwlock_function mdbx_srwlock_Init, mdbx_srwlock_AcquireShared,
/*----------------------------------------------------------------------------*/
static DWORD WINAPI stub_DiscardVirtualMemory(PVOID VirtualAddress,
SIZE_T Size) {
return VirtualAlloc(VirtualAddress, Size, MEM_RESET, PAGE_NOACCESS)
? ERROR_SUCCESS
: GetLastError();
}
/*----------------------------------------------------------------------------*/
MDBX_GetFileInformationByHandleEx mdbx_GetFileInformationByHandleEx;
MDBX_GetVolumeInformationByHandleW mdbx_GetVolumeInformationByHandleW;
MDBX_GetFinalPathNameByHandleW mdbx_GetFinalPathNameByHandleW;
MDBX_SetFileInformationByHandle mdbx_SetFileInformationByHandle;
MDBX_PrefetchVirtualMemory mdbx_PrefetchVirtualMemory;
MDBX_DiscardVirtualMemory mdbx_DiscardVirtualMemory;
MDBX_NtFsControlFile mdbx_NtFsControlFile;
static void mdbx_winnt_import(void) {
@@ -700,6 +710,9 @@ static void mdbx_winnt_import(void) {
GET_KERNEL32_PROC(GetFinalPathNameByHandleW);
GET_KERNEL32_PROC(SetFileInformationByHandle);
GET_KERNEL32_PROC(PrefetchVirtualMemory);
GET_KERNEL32_PROC(DiscardVirtualMemory);
if (!mdbx_DiscardVirtualMemory)
mdbx_DiscardVirtualMemory = stub_DiscardVirtualMemory;
const HINSTANCE hNtdll = GetModuleHandleA("ntdll.dll");
mdbx_NtFsControlFile =