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Rewrite PlaceholderManager4KB to use intrusive RBTree, and to coalesce free placeholders

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Also make the other placeholder manager use intrusive RBTree, allows the IntervalTree that was added just for this to be deleted
This commit is contained in:
gdk 2022-06-23 04:05:56 -03:00 committed by Mary-nyan
parent 5b5810a46a
commit 45e520a27c
3 changed files with 126 additions and 501 deletions
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453
Ryujinx.Memory/WindowsShared/IntervalTree.cs
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@ -1,453 +0,0 @@
using Ryujinx.Common.Collections;
using System;
using System.Collections.Generic;
namespace Ryujinx.Memory.WindowsShared
{
/// <summary>
/// An Augmented Interval Tree based off of the "TreeDictionary"'s Red-Black Tree. Allows fast overlap checking of ranges.
/// </summary>
/// <typeparam name="K">Key</typeparam>
/// <typeparam name="V">Value</typeparam>
class IntervalTree<K, V> : IntrusiveRedBlackTreeImpl<IntervalTreeNode<K, V>> where K : IComparable<K>
{
private const int ArrayGrowthSize = 32;
#region Public Methods
/// <summary>
/// Gets the values of the interval whose key is <paramref name="key"/>.
/// </summary>
/// <param name="key">Key of the node value to get</param>
/// <param name="value">Value with the given <paramref name="key"/></param>
/// <returns>True if the key is on the dictionary, false otherwise</returns>
public bool TryGet(K key, out V value)
{
IntervalTreeNode<K, V> node = GetNode(key);
if (node == null)
{
value = default;
return false;
}
value = node.Value;
return true;
}
/// <summary>
/// Returns the start addresses of the intervals whose start and end keys overlap the given range.
/// </summary>
/// <param name="start">Start of the range</param>
/// <param name="end">End of the range</param>
/// <param name="overlaps">Overlaps array to place results in</param>
/// <param name="overlapCount">Index to start writing results into the array. Defaults to 0</param>
/// <returns>Number of intervals found</returns>
public int Get(K start, K end, ref IntervalTreeNode<K, V>[] overlaps, int overlapCount = 0)
{
GetNodes(Root, start, end, ref overlaps, ref overlapCount);
return overlapCount;
}
/// <summary>
/// Adds a new interval into the tree whose start is <paramref name="start"/>, end is <paramref name="end"/> and value is <paramref name="value"/>.
/// </summary>
/// <param name="start">Start of the range to add</param>
/// <param name="end">End of the range to insert</param>
/// <param name="value">Value to add</param>
/// <exception cref="ArgumentNullException"><paramref name="value"/> is null</exception>
public void Add(K start, K end, V value)
{
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
BSTInsert(start, end, value, null, out _);
}
/// <summary>
/// Removes a value from the tree, searching for it with <paramref name="key"/>.
/// </summary>
/// <param name="key">Key of the node to remove</param>
/// <returns>Number of deleted values</returns>
public int Remove(K key)
{
return Remove(GetNode(key));
}
/// <summary>
/// Removes a value from the tree, searching for it with <paramref name="key"/>.
/// </summary>
/// <param name="nodeToDelete">Node to be removed</param>
/// <returns>Number of deleted values</returns>
public int Remove(IntervalTreeNode<K, V> nodeToDelete)
{
if (nodeToDelete == null)
{
return 0;
}
Delete(nodeToDelete);
Count--;
return 1;
}
/// <summary>
/// Adds all the nodes in the dictionary into <paramref name="list"/>.
/// </summary>
/// <returns>A list of all values sorted by Key Order</returns>
public List<V> AsList()
{
List<V> list = new List<V>();
AddToList(Root, list);
return list;
}
#endregion
#region Private Methods (BST)
/// <summary>
/// Adds all values that are children of or contained within <paramref name="node"/> into <paramref name="list"/>, in Key Order.
/// </summary>
/// <param name="node">The node to search for values within</param>
/// <param name="list">The list to add values to</param>
private void AddToList(IntervalTreeNode<K, V> node, List<V> list)
{
if (node == null)
{
return;
}
AddToList(node.Left, list);
list.Add(node.Value);
AddToList(node.Right, list);
}
/// <summary>
/// Retrieve the node reference whose key is <paramref name="key"/>, or null if no such node exists.
/// </summary>
/// <param name="key">Key of the node to get</param>
/// <exception cref="ArgumentNullException"><paramref name="key"/> is null</exception>
/// <returns>Node reference in the tree</returns>
private IntervalTreeNode<K, V> GetNode(K key)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
IntervalTreeNode<K, V> node = Root;
while (node != null)
{
int cmp = key.CompareTo(node.Start);
if (cmp < 0)
{
node = node.Left;
}
else if (cmp > 0)
{
node = node.Right;
}
else
{
return node;
}
}
return null;
}
/// <summary>
/// Retrieve all nodes that overlap the given start and end keys.
/// </summary>
/// <param name="start">Start of the range</param>
/// <param name="end">End of the range</param>
/// <param name="overlaps">Overlaps array to place results in</param>
/// <param name="overlapCount">Overlaps count to update</param>
private void GetNodes(IntervalTreeNode<K, V> node, K start, K end, ref IntervalTreeNode<K, V>[] overlaps, ref int overlapCount)
{
if (node == null || start.CompareTo(node.Max) >= 0)
{
return;
}
GetNodes(node.Left, start, end, ref overlaps, ref overlapCount);
bool endsOnRight = end.CompareTo(node.Start) > 0;
if (endsOnRight)
{
if (start.CompareTo(node.End) < 0)
{
if (overlaps.Length >= overlapCount)
{
Array.Resize(ref overlaps, overlapCount + ArrayGrowthSize);
}
overlaps[overlapCount++] = node;
}
GetNodes(node.Right, start, end, ref overlaps, ref overlapCount);
}
}
/// <summary>
/// Propagate an increase in max value starting at the given node, heading up the tree.
/// This should only be called if the max increases - not for rebalancing or removals.
/// </summary>
/// <param name="node">The node to start propagating from</param>
private void PropagateIncrease(IntervalTreeNode<K, V> node)
{
K max = node.Max;
IntervalTreeNode<K, V> ptr = node;
while ((ptr = ptr.Parent) != null)
{
if (max.CompareTo(ptr.Max) > 0)
{
ptr.Max = max;
}
else
{
break;
}
}
}
/// <summary>
/// Propagate recalculating max value starting at the given node, heading up the tree.
/// This fully recalculates the max value from all children when there is potential for it to decrease.
/// </summary>
/// <param name="node">The node to start propagating from</param>
private void PropagateFull(IntervalTreeNode<K, V> node)
{
IntervalTreeNode<K, V> ptr = node;
do
{
K max = ptr.End;
if (ptr.Left != null && ptr.Left.Max.CompareTo(max) > 0)
{
max = ptr.Left.Max;
}
if (ptr.Right != null && ptr.Right.Max.CompareTo(max) > 0)
{
max = ptr.Right.Max;
}
ptr.Max = max;
} while ((ptr = ptr.Parent) != null);
}
/// <summary>
/// Insertion Mechanism for the interval tree. Similar to a BST insert, with the start of the range as the key.
/// Iterates the tree starting from the root and inserts a new node where all children in the left subtree are less than <paramref name="start"/>, and all children in the right subtree are greater than <paramref name="start"/>.
/// Each node can contain multiple values, and has an end address which is the maximum of all those values.
/// Post insertion, the "max" value of the node and all parents are updated.
/// </summary>
/// <param name="start">Start of the range to insert</param>
/// <param name="end">End of the range to insert</param>
/// <param name="value">Value to insert</param>
/// <param name="updateFactoryCallback">Optional factory used to create a new value if <paramref name="start"/> is already on the tree</param>
/// <param name="outNode">Node that was inserted or modified</param>
/// <returns>True if <paramref name="start"/> was not yet on the tree, false otherwise</returns>
private bool BSTInsert(K start, K end, V value, Func<K, V, V> updateFactoryCallback, out IntervalTreeNode<K, V> outNode)
{
IntervalTreeNode<K, V> parent = null;
IntervalTreeNode<K, V> node = Root;
while (node != null)
{
parent = node;
int cmp = start.CompareTo(node.Start);
if (cmp < 0)
{
node = node.Left;
}
else if (cmp > 0)
{
node = node.Right;
}
else
{
outNode = node;
if (updateFactoryCallback != null)
{
// Replace
node.Value = updateFactoryCallback(start, node.Value);
int endCmp = end.CompareTo(node.End);
if (endCmp > 0)
{
node.End = end;
if (end.CompareTo(node.Max) > 0)
{
node.Max = end;
PropagateIncrease(node);
RestoreBalanceAfterInsertion(node);
}
}
else if (endCmp < 0)
{
node.End = end;
PropagateFull(node);
}
}
return false;
}
}
IntervalTreeNode<K, V> newNode = new IntervalTreeNode<K, V>(start, end, value, parent);
if (newNode.Parent == null)
{
Root = newNode;
}
else if (start.CompareTo(parent.Start) < 0)
{
parent.Left = newNode;
}
else
{
parent.Right = newNode;
}
PropagateIncrease(newNode);
Count++;
RestoreBalanceAfterInsertion(newNode);
outNode = newNode;
return true;
}
/// <summary>
/// Removes the value from the dictionary after searching for it with <paramref name="key">.
/// </summary>
/// <param name="key">Tree node to be removed</param>
private void Delete(IntervalTreeNode<K, V> nodeToDelete)
{
IntervalTreeNode<K, V> replacementNode;
if (LeftOf(nodeToDelete) == null || RightOf(nodeToDelete) == null)
{
replacementNode = nodeToDelete;
}
else
{
replacementNode = nodeToDelete.Predecessor;
}
IntervalTreeNode<K, V> tmp = LeftOf(replacementNode) ?? RightOf(replacementNode);
if (tmp != null)
{
tmp.Parent = ParentOf(replacementNode);
}
if (ParentOf(replacementNode) == null)
{
Root = tmp;
}
else if (replacementNode == LeftOf(ParentOf(replacementNode)))
{
ParentOf(replacementNode).Left = tmp;
}
else
{
ParentOf(replacementNode).Right = tmp;
}
if (replacementNode != nodeToDelete)
{
nodeToDelete.Start = replacementNode.Start;
nodeToDelete.Value = replacementNode.Value;
nodeToDelete.End = replacementNode.End;
nodeToDelete.Max = replacementNode.Max;
}
PropagateFull(replacementNode);
if (tmp != null && ColorOf(replacementNode) == Black)
{
RestoreBalanceAfterRemoval(tmp);
}
}
#endregion
#region Private Methods (RBL)
protected override void RotateLeft(IntervalTreeNode<K, V> node)
{
if (node != null)
{
base.RotateLeft(node);
PropagateFull(node);
}
}
protected override void RotateRight(IntervalTreeNode<K, V> node)
{
if (node != null)
{
base.RotateRight(node);
PropagateFull(node);
}
}
#endregion
public bool ContainsKey(K key)
{
return GetNode(key) != null;
}
}
/// <summary>
/// Represents a node in the IntervalTree which contains start and end keys of type K, and a value of generic type V.
/// </summary>
/// <typeparam name="K">Key type of the node</typeparam>
/// <typeparam name="V">Value type of the node</typeparam>
class IntervalTreeNode<K, V> : IntrusiveRedBlackTreeNode<IntervalTreeNode<K, V>>
{
/// <summary>
/// The start of the range.
/// </summary>
public K Start;
/// <summary>
/// The end of the range.
/// </summary>
public K End;
/// <summary>
/// The maximum end value of this node and all its children.
/// </summary>
public K Max;
/// <summary>
/// Value stored on this node.
/// </summary>
public V Value;
public IntervalTreeNode(K start, K end, V value, IntervalTreeNode<K, V> parent)
{
Start = start;
End = end;
Max = end;
Value = value;
Parent = parent;
}
}
}

69
Ryujinx.Memory/WindowsShared/MappingTree.cs Normal file
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@ -0,0 +1,69 @@
using Ryujinx.Common.Collections;
using System;
namespace Ryujinx.Memory.WindowsShared
{
/// <summary>
/// A intrusive Red-Black Tree that also supports getting nodes overlapping a given range.
/// </summary>
/// <typeparam name="T">Type of the value stored on the node</typeparam>
class MappingTree<T> : IntrusiveRedBlackTree<RangeNode<T>>
{
public int GetNodes(ulong start, ulong end, ref RangeNode<T>[] overlaps, int overlapCount = 0)
{
RangeNode<T> node = GetNode(new RangeNode<T>(start, start + 1UL, default));
for (; node != null; node = node.Successor)
{
if (overlaps.Length <= overlapCount)
{
Array.Resize(ref overlaps, overlapCount + 1);
}
overlaps[overlapCount++] = node;
if (node.End >= end)
{
break;
}
}
return overlapCount;
}
}
class RangeNode<T> : IntrusiveRedBlackTreeNode<RangeNode<T>>, IComparable<RangeNode<T>>
{
public ulong Start { get; }
public ulong End { get; private set; }
public T Value { get; }
public RangeNode(ulong start, ulong end, T value)
{
Start = start;
End = end;
Value = value;
}
public void Extend(ulong sizeDelta)
{
End += sizeDelta;
}
public int CompareTo(RangeNode<T> other)
{
if (Start < other.Start)
{
return -1;
}
else if (Start <= other.End - 1UL)
{
return 0;
}
else
{
return 1;
}
}
}
}

105
Ryujinx.Memory/WindowsShared/PlaceholderManager.cs
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@ -13,10 +13,10 @@ namespace Ryujinx.Memory.WindowsShared
[SupportedOSPlatform("windows")]
class PlaceholderManager
{
private const ulong MinimumPageSize = 0x1000;
private const int InitialOverlapsSize = 10;
private readonly IntervalTree<ulong, ulong> _mappings;
private readonly IntervalTree<ulong, MemoryPermission> _protections;
private readonly MappingTree<ulong> _mappings;
private readonly MappingTree<MemoryPermission> _protections;
private readonly IntPtr _partialUnmapStatePtr;
private readonly Thread _partialUnmapTrimThread;
@ -25,8 +25,8 @@ namespace Ryujinx.Memory.WindowsShared
/// </summary>
public PlaceholderManager()
{
_mappings = new IntervalTree<ulong, ulong>();
_protections = new IntervalTree<ulong, MemoryPermission>();
_mappings = new MappingTree<ulong>();
_protections = new MappingTree<MemoryPermission>();
_partialUnmapStatePtr = PartialUnmapState.GlobalState;
@ -67,7 +67,7 @@ namespace Ryujinx.Memory.WindowsShared
{
lock (_mappings)
{
_mappings.Add(address, address + size, ulong.MaxValue);
_mappings.Add(new RangeNode<ulong>(address, address + size, ulong.MaxValue));
}
}
@ -81,12 +81,12 @@ namespace Ryujinx.Memory.WindowsShared
{
ulong endAddress = address + size;
var overlaps = Array.Empty<IntervalTreeNode<ulong, ulong>>();
var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
int count;
lock (_mappings)
{
count = _mappings.Get(address, endAddress, ref overlaps);
count = _mappings.GetNodes(address, endAddress, ref overlaps);
for (int index = 0; index < count; index++)
{
@ -178,11 +178,11 @@ namespace Ryujinx.Memory.WindowsShared
{
ulong endAddress = address + size;
var overlaps = Array.Empty<IntervalTreeNode<ulong, ulong>>();
var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
lock (_mappings)
{
int count = _mappings.Get(address, endAddress, ref overlaps);
int count = _mappings.GetNodes(address, endAddress, ref overlaps);
Debug.Assert(count == 1);
Debug.Assert(!IsMapped(overlaps[0].Value));
@ -206,8 +206,8 @@ namespace Ryujinx.Memory.WindowsShared
(IntPtr)size,
AllocationType.Release | AllocationType.PreservePlaceholder));
_mappings.Add(overlapStart, address, overlapValue);
_mappings.Add(endAddress, overlapEnd, AddBackingOffset(overlapValue, endAddress - overlapStart));
_mappings.Add(new RangeNode<ulong>(overlapStart, address, overlapValue));
_mappings.Add(new RangeNode<ulong>(endAddress, overlapEnd, AddBackingOffset(overlapValue, endAddress - overlapStart)));
}
else if (overlapStartsBefore)
{
@ -218,7 +218,7 @@ namespace Ryujinx.Memory.WindowsShared
(IntPtr)overlappedSize,
AllocationType.Release | AllocationType.PreservePlaceholder));
_mappings.Add(overlapStart, address, overlapValue);
_mappings.Add(new RangeNode<ulong>(overlapStart, address, overlapValue));
}
else if (overlapEndsAfter)
{
@ -229,10 +229,10 @@ namespace Ryujinx.Memory.WindowsShared
(IntPtr)overlappedSize,
AllocationType.Release | AllocationType.PreservePlaceholder));
_mappings.Add(endAddress, overlapEnd, AddBackingOffset(overlapValue, overlappedSize));
_mappings.Add(new RangeNode<ulong>(endAddress, overlapEnd, AddBackingOffset(overlapValue, overlappedSize)));
}
_mappings.Add(address, endAddress, backingOffset);
_mappings.Add(new RangeNode<ulong>(address, endAddress, backingOffset));
}
}
@ -280,12 +280,12 @@ namespace Ryujinx.Memory.WindowsShared
ulong unmapSize = (ulong)size;
ulong endAddress = startAddress + unmapSize;
var overlaps = Array.Empty<IntervalTreeNode<ulong, ulong>>();
var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
int count;
lock (_mappings)
{
count = _mappings.Get(startAddress, endAddress, ref overlaps);
count = _mappings.GetNodes(startAddress, endAddress, ref overlaps);
}
for (int index = 0; index < count; index++)
@ -302,7 +302,7 @@ namespace Ryujinx.Memory.WindowsShared
lock (_mappings)
{
_mappings.Remove(overlap);
_mappings.Add(overlapStart, overlapEnd, ulong.MaxValue);
_mappings.Add(new RangeNode<ulong>(overlapStart, overlapEnd, ulong.MaxValue));
}
bool overlapStartsBefore = overlapStart < startAddress;
@ -374,44 +374,53 @@ namespace Ryujinx.Memory.WindowsShared
ulong endAddress = address + size;
ulong blockAddress = (ulong)owner.Pointer;
ulong blockEnd = blockAddress + owner.Size;
var overlaps = Array.Empty<IntervalTreeNode<ulong, ulong>>();
var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
int unmappedCount = 0;
lock (_mappings)
{
int count = _mappings.Get(
Math.Max(address - MinimumPageSize, blockAddress),
Math.Min(endAddress + MinimumPageSize, blockEnd), ref overlaps);
int count = _mappings.GetNodes(address, endAddress, ref overlaps);
if (count < 2)
if (count == 0)
{
// Nothing to coalesce if we only have 1 or no overlaps.
// Nothing to coalesce if we no overlaps.
return;
}
RangeNode<ulong> predecessor = overlaps[0].Predecessor;
RangeNode<ulong> successor = overlaps[count - 1].Successor;
for (int index = 0; index < count; index++)
{
var overlap = overlaps[index];
if (!IsMapped(overlap.Value))
{
if (address > overlap.Start)
{
address = overlap.Start;
}
if (endAddress < overlap.End)
{
endAddress = overlap.End;
}
address = Math.Min(address, overlap.Start);
endAddress = Math.Max(endAddress, overlap.End);
_mappings.Remove(overlap);
unmappedCount++;
}
}
_mappings.Add(address, endAddress, ulong.MaxValue);
if (predecessor != null && !IsMapped(predecessor.Value) && predecessor.Start >= blockAddress)
{
address = Math.Min(address, predecessor.Start);
_mappings.Remove(predecessor);
unmappedCount++;
}
if (successor != null && !IsMapped(successor.Value) && successor.End <= blockEnd)
{
endAddress = Math.Max(endAddress, successor.End);
_mappings.Remove(successor);
unmappedCount++;
}
_mappings.Add(new RangeNode<ulong>(address, endAddress, ulong.MaxValue));
}
if (unmappedCount > 1)
@ -462,12 +471,12 @@ namespace Ryujinx.Memory.WindowsShared
ulong reprotectSize = (ulong)size;
ulong endAddress = reprotectAddress + reprotectSize;
var overlaps = Array.Empty<IntervalTreeNode<ulong, ulong>>();
var overlaps = new RangeNode<ulong>[InitialOverlapsSize];
int count;
lock (_mappings)
{
count = _mappings.Get(reprotectAddress, endAddress, ref overlaps);
count = _mappings.GetNodes(reprotectAddress, endAddress, ref overlaps);
}
bool success = true;
@ -567,12 +576,12 @@ namespace Ryujinx.Memory.WindowsShared
private void AddProtection(ulong address, ulong size, MemoryPermission permission)
{
ulong endAddress = address + size;
var overlaps = Array.Empty<IntervalTreeNode<ulong, MemoryPermission>>();
var overlaps = new RangeNode<MemoryPermission>[InitialOverlapsSize];
int count;
lock (_protections)
{
count = _protections.Get(address, endAddress, ref overlaps);
count = _protections.GetNodes(address, endAddress, ref overlaps);
if (count == 1 &&
overlaps[0].Start <= address &&
@ -610,17 +619,17 @@ namespace Ryujinx.Memory.WindowsShared
{
if (startAddress > protAddress)
{
_protections.Add(protAddress, startAddress, protPermission);
_protections.Add(new RangeNode<MemoryPermission>(protAddress, startAddress, protPermission));
}
if (endAddress < protEndAddress)
{
_protections.Add(endAddress, protEndAddress, protPermission);
_protections.Add(new RangeNode<MemoryPermission>(endAddress, protEndAddress, protPermission));
}
}
}
_protections.Add(startAddress, endAddress, permission);
_protections.Add(new RangeNode<MemoryPermission>(startAddress, endAddress, permission));
}
}
@ -632,12 +641,12 @@ namespace Ryujinx.Memory.WindowsShared
private void RemoveProtection(ulong address, ulong size)
{
ulong endAddress = address + size;
var overlaps = Array.Empty<IntervalTreeNode<ulong, MemoryPermission>>();
var overlaps = new RangeNode<MemoryPermission>[InitialOverlapsSize];
int count;
lock (_protections)
{
count = _protections.Get(address, endAddress, ref overlaps);
count = _protections.GetNodes(address, endAddress, ref overlaps);
for (int index = 0; index < count; index++)
{
@ -651,12 +660,12 @@ namespace Ryujinx.Memory.WindowsShared
if (address > protAddress)
{
_protections.Add(protAddress, address, protPermission);
_protections.Add(new RangeNode<MemoryPermission>(protAddress, address, protPermission));
}
if (endAddress < protEndAddress)
{
_protections.Add(endAddress, protEndAddress, protPermission);
_protections.Add(new RangeNode<MemoryPermission>(endAddress, protEndAddress, protPermission));
}
}
}
@ -670,12 +679,12 @@ namespace Ryujinx.Memory.WindowsShared
private void RestoreRangeProtection(ulong address, ulong size)
{
ulong endAddress = address + size;
var overlaps = Array.Empty<IntervalTreeNode<ulong, MemoryPermission>>();
var overlaps = new RangeNode<MemoryPermission>[InitialOverlapsSize];
int count;
lock (_protections)
{
count = _protections.Get(address, endAddress, ref overlaps);
count = _protections.GetNodes(address, endAddress, ref overlaps);
}
ulong startAddress = address;