public override unsafe void ReleaseAllocationInfo(byte *baseAddress, long size)
{
base.ReleaseAllocationInfo(baseAddress, size);
if (_supportsUnmapping == false)
{
return;
}
var ptr = new IntPtr(baseAddress);
if (DeleteOnClose)
{
if (Syscall.madvise(ptr, new UIntPtr((ulong)size), MAdvFlags.MADV_DONTNEED) != 0)
{
if (_log.IsInfoEnabled)
{
_log.Info($"Failed to madvise MDV_DONTNEED for {FileName?.FullPath}");
}
}
}
var result = Syscall.munmap(ptr, (UIntPtr)size);
if (result == -1)
{
var err = Marshal.GetLastWin32Error();
Syscall.ThrowLastError(err, "munmap " + FileName);
}
NativeMemory.UnregisterFileMapping(FileName.FullPath, ptr, size);
}
protected internal override unsafe void PrefetchRanges(Win32MemoryMapNativeMethods.WIN32_MEMORY_RANGE_ENTRY *list, int count)
{
for (int i = 0; i < count; i++)
{
// we explicitly ignore the return code here, this is optimization only
Syscall.madvise(new IntPtr(list[i].VirtualAddress), (UIntPtr)list[i].NumberOfBytes.ToPointer(), MAdvFlags.MADV_WILLNEED);
}
}
private unsafe void PrefetchRanges(List <Win32MemoryMapNativeMethods.WIN32_MEMORY_RANGE_ENTRY> ranges)
{
foreach (var range in ranges)
{
if (Syscall.madvise(new IntPtr(range.VirtualAddress), (UIntPtr)range.NumberOfBytes.ToPointer(), MAdvFlags.MADV_WILLNEED) == -1)
{
// ignore this error. TODO : Log ?
}
}
}
public override unsafe byte *AcquirePagePointer(IPagerLevelTransactionState tx, long pageNumber, PagerState pagerState = null)
{
// We need to decide what pager we are going to use right now or risk inconsistencies when performing prefetches from disk.
var state = pagerState ?? _pagerState;
if (PlatformDetails.CanPrefetch)
{
if (this._pagerState.ShouldPrefetchSegment(pageNumber, out void *virtualAddress, out long bytes))
{
Syscall.madvise(new IntPtr(virtualAddress), (UIntPtr)bytes, MAdvFlags.MADV_WILLNEED);
}
}
return(base.AcquirePagePointer(tx, pageNumber, state));
}