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Remove freed memory range from tree on memory block disposal (#3347)

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* Remove freed memory range from tree on memory block disposal

* PR feedback
This commit is contained in:
gdkchan 2022-06-05 15:12:42 -03:00 • committed by GitHub
parent 633c5ec330
commit dd8f97ab9e
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 76 additions and 21 deletions
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69
Ryujinx.Memory/WindowsShared/PlaceholderManager.cs
View file

@ -44,6 +44,50 @@ namespace Ryujinx.Memory.WindowsShared
}
}
/// <summary>
/// Unreserves a range of memory that has been previously reserved with <see cref="ReserveRange"/>.
/// </summary>
/// <param name="address">Start address of the region to unreserve</param>
/// <param name="size">Size in bytes of the region to unreserve</param>
/// <exception cref="WindowsApiException">Thrown when the Windows API returns an error unreserving the memory</exception>
public void UnreserveRange(ulong address, ulong size)
{
ulong endAddress = address + size;
var overlaps = Array.Empty<IntervalTreeNode<ulong, ulong>>();
int count;
lock (_mappings)
{
count = _mappings.Get(address, endAddress, ref overlaps);
for (int index = 0; index < count; index++)
{
var overlap = overlaps[index];
if (IsMapped(overlap.Value))
{
if (!WindowsApi.UnmapViewOfFile2(WindowsApi.CurrentProcessHandle, (IntPtr)overlap.Start, 2))
{
throw new WindowsApiException("UnmapViewOfFile2");
}
}
_mappings.Remove(overlap);
}
}
if (count > 1)
{
CheckFreeResult(WindowsApi.VirtualFree(
(IntPtr)address,
(IntPtr)size,
AllocationType.Release | AllocationType.CoalescePlaceholders));
}
RemoveProtection(address, size);
}
/// <summary>
/// Maps a shared memory view on a previously reserved memory region.
/// </summary>
@ -51,13 +95,14 @@ namespace Ryujinx.Memory.WindowsShared
/// <param name="srcOffset">Offset in the shared memory to map</param>
/// <param name="location">Address to map the view into</param>
/// <param name="size">Size of the view in bytes</param>
public void MapView(IntPtr sharedMemory, ulong srcOffset, IntPtr location, IntPtr size)
/// <param name="owner">Memory block that owns the mapping</param>
public void MapView(IntPtr sharedMemory, ulong srcOffset, IntPtr location, IntPtr size, MemoryBlock owner)
{
_partialUnmapLock.AcquireReaderLock(Timeout.Infinite);
try
{
UnmapViewInternal(sharedMemory, location, size);
UnmapViewInternal(sharedMemory, location, size, owner);
MapViewInternal(sharedMemory, srcOffset, location, size);
}
finally
@ -173,13 +218,14 @@ namespace Ryujinx.Memory.WindowsShared
/// <param name="sharedMemory">Shared memory that the view being unmapped belongs to</param>
/// <param name="location">Address to unmap</param>
/// <param name="size">Size of the region to unmap in bytes</param>
public void UnmapView(IntPtr sharedMemory, IntPtr location, IntPtr size)
/// <param name="owner">Memory block that owns the mapping</param>
public void UnmapView(IntPtr sharedMemory, IntPtr location, IntPtr size, MemoryBlock owner)
{
_partialUnmapLock.AcquireReaderLock(Timeout.Infinite);
try
{
UnmapViewInternal(sharedMemory, location, size);
UnmapViewInternal(sharedMemory, location, size, owner);
}
finally
{
@ -197,8 +243,9 @@ namespace Ryujinx.Memory.WindowsShared
/// <param name="sharedMemory">Shared memory that the view being unmapped belongs to</param>
/// <param name="location">Address to unmap</param>
/// <param name="size">Size of the region to unmap in bytes</param>
/// <param name="owner">Memory block that owns the mapping</param>
/// <exception cref="WindowsApiException">Thrown when the Windows API returns an error unmapping or remapping the memory</exception>
private void UnmapViewInternal(IntPtr sharedMemory, IntPtr location, IntPtr size)
private void UnmapViewInternal(IntPtr sharedMemory, IntPtr location, IntPtr size, MemoryBlock owner)
{
ulong startAddress = (ulong)location;
ulong unmapSize = (ulong)size;
@ -272,7 +319,7 @@ namespace Ryujinx.Memory.WindowsShared
}
}
CoalesceForUnmap(startAddress, unmapSize);
CoalesceForUnmap(startAddress, unmapSize, owner);
RemoveProtection(startAddress, unmapSize);
}
@ -281,15 +328,21 @@ namespace Ryujinx.Memory.WindowsShared
/// </summary>
/// <param name="address">Address of the region that was unmapped</param>
/// <param name="size">Size of the region that was unmapped in bytes</param>
private void CoalesceForUnmap(ulong address, ulong size)
/// <param name="owner">Memory block that owns the mapping</param>
private void CoalesceForUnmap(ulong address, ulong size, MemoryBlock owner)
{
ulong endAddress = address + size;
ulong blockAddress = (ulong)owner.Pointer;
ulong blockEnd = blockAddress + owner.Size;
var overlaps = Array.Empty<IntervalTreeNode<ulong, ulong>>();
int unmappedCount = 0;
lock (_mappings)
{
int count = _mappings.Get(address - MinimumPageSize, endAddress + MinimumPageSize, ref overlaps);
int count = _mappings.Get(
Math.Max(address - MinimumPageSize, blockAddress),
Math.Min(endAddress + MinimumPageSize, blockEnd), ref overlaps);
if (count < 2)
{
// Nothing to coalesce if we only have 1 or no overlaps.