/// <summary>
/// Create instance of PMM
/// </summary>
/// <param name="settings"></param>
/// <param name="startAddress"></param>
/// <param name="pageHandlers"></param>
internal PersistentMemoryMalloc(LogSettings settings, long startAddress, IPageHandlers pageHandlers)
{
// Segment size
LogSegmentSizeBits = settings.SegmentSizeBits;
SegmentSize = 1 << LogSegmentSizeBits;
SegmentSizeMask = SegmentSize - 1;
SegmentBufferSize = 1 +
(LogTotalSizeBytes / SegmentSize < 1 ? 1 : (int)(LogTotalSizeBytes / SegmentSize));
// Total HLOG size
LogTotalSizeBits = settings.MemorySizeBits;
LogTotalSizeBytes = 1L << LogTotalSizeBits;
BufferSize = (int)(LogTotalSizeBytes / (1L << LogPageSizeBits));
// HeadOffset lag (from tail)
HeadOffsetLagSize = BufferSize - HeadOffsetLagNumPages;
HeadOffsetLagAddress = (long)HeadOffsetLagSize << LogPageSizeBits;
// ReadOnlyOffset lag (from tail)
LogMutableFraction = settings.MutableFraction;
ReadOnlyLagAddress = (long)(LogMutableFraction * BufferSize) << LogPageSizeBits;
values = new byte[BufferSize][];
handles = new GCHandle[BufferSize];
pointers = new long[BufferSize];
PageStatusIndicator = new FullPageStatus[BufferSize];
segmentOffsets = new long[SegmentBufferSize];
if (BufferSize < 16)
{
throw new Exception("HLOG buffer must be at least 16 pages");
}
device = settings.LogDevice;
objectLogDevice = settings.ObjectLogDevice;
if (pageHandlers.HasObjects())
{
if (objectLogDevice == null)
{
throw new Exception("Objects in key/value, but object log not provided during creation of FASTER instance");
}
}
sectorSize = (int)device.SectorSize;
epoch = LightEpoch.Instance;
ioBufferPool = NativeSectorAlignedBufferPool.GetPool(1, sectorSize);
AlignedPageSizeBytes = ((PageSize + (sectorSize - 1)) & ~(sectorSize - 1));
ptrHandle = GCHandle.Alloc(pointers, GCHandleType.Pinned);
nativePointers = (long *)ptrHandle.AddrOfPinnedObject();
Initialize(startAddress);
}
private void ClearPage(int page, bool pageZero)
{
if (pageHandlers.HasObjects())
{
long ptr = pointers[page];
int numBytes = PageSize;
long endptr = ptr + numBytes;
if (pageZero)
{
ptr += Constants.kFirstValidAddress;
}
pageHandlers.ClearPage(ptr, endptr);
}
Array.Clear(values[page], 0, values[page].Length);
}