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GPU: Use a bitmap to track buffer modified flags. (#3775)

* Initial implementation

* Some improvements.

* Fix incorrect cast

* Performance improvement and improved correctness

* Add very fast path when all handles are checked.

* Slightly faster

* Add comment

* De-virtualize region handle

All region handles are now bitmap backed.

* Remove non-bitmap tracking

* Remove unused methods

* Add docs, remove unused methods

* Address Feedback

* Rename file
This commit is contained in:
riperiperi 2022-10-29 23:07:37 +01:00 committed by GitHub
parent 141cf61ff7
commit 3d98e1361b
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 696 additions and 74 deletions

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@ -0,0 +1,199 @@
using System.Runtime.CompilerServices;
namespace Ryujinx.Memory.Tracking
{
/// <summary>
/// A bitmap that can check or set large ranges of true/false values at once.
/// </summary>
struct BitMap
{
public const int IntSize = 64;
private const int IntShift = 6;
private const int IntMask = IntSize - 1;
/// <summary>
/// Masks representing the bitmap. Least significant bit first, 64-bits per mask.
/// </summary>
public readonly long[] Masks;
/// <summary>
/// Create a new bitmap.
/// </summary>
/// <param name="count">The number of bits to reserve</param>
public BitMap(int count)
{
Masks = new long[(count + IntMask) / IntSize];
}
/// <summary>
/// Check if any bit in the bitmap is set.
/// </summary>
/// <returns>True if any bits are set, false otherwise</returns>
public bool AnySet()
{
for (int i = 0; i < Masks.Length; i++)
{
if (Masks[i] != 0)
{
return true;
}
}
return false;
}
/// <summary>
/// Check if a bit in the bitmap is set.
/// </summary>
/// <param name="bit">The bit index to check</param>
/// <returns>True if the bit is set, false otherwise</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public bool IsSet(int bit)
{
int wordIndex = bit >> IntShift;
int wordBit = bit & IntMask;
long wordMask = 1L << wordBit;
return (Masks[wordIndex] & wordMask) != 0;
}
/// <summary>
/// Check if any bit in a range of bits in the bitmap are set. (inclusive)
/// </summary>
/// <param name="start">The first bit index to check</param>
/// <param name="end">The last bit index to check</param>
/// <returns>True if a bit is set, false otherwise</returns>
public bool IsSet(int start, int end)
{
if (start == end)
{
return IsSet(start);
}
int startIndex = start >> IntShift;
int startBit = start & IntMask;
long startMask = -1L << startBit;
int endIndex = end >> IntShift;
int endBit = end & IntMask;
long endMask = (long)(ulong.MaxValue >> (IntMask - endBit));
if (startIndex == endIndex)
{
return (Masks[startIndex] & startMask & endMask) != 0;
}
if ((Masks[startIndex] & startMask) != 0)
{
return true;
}
for (int i = startIndex + 1; i < endIndex; i++)
{
if (Masks[i] != 0)
{
return true;
}
}
if ((Masks[endIndex] & endMask) != 0)
{
return true;
}
return false;
}
/// <summary>
/// Set a bit at a specific index to 1.
/// </summary>
/// <param name="bit">The bit index to set</param>
/// <returns>True if the bit is set, false if it was already set</returns>
public bool Set(int bit)
{
int wordIndex = bit >> IntShift;
int wordBit = bit & IntMask;
long wordMask = 1L << wordBit;
if ((Masks[wordIndex] & wordMask) != 0)
{
return false;
}
Masks[wordIndex] |= wordMask;
return true;
}
/// <summary>
/// Set a range of bits in the bitmap to 1.
/// </summary>
/// <param name="start">The first bit index to set</param>
/// <param name="end">The last bit index to set</param>
public void SetRange(int start, int end)
{
if (start == end)
{
Set(start);
return;
}
int startIndex = start >> IntShift;
int startBit = start & IntMask;
long startMask = -1L << startBit;
int endIndex = end >> IntShift;
int endBit = end & IntMask;
long endMask = (long)(ulong.MaxValue >> (IntMask - endBit));
if (startIndex == endIndex)
{
Masks[startIndex] |= startMask & endMask;
}
else
{
Masks[startIndex] |= startMask;
for (int i = startIndex + 1; i < endIndex; i++)
{
Masks[i] |= -1;
}
Masks[endIndex] |= endMask;
}
}
/// <summary>
/// Clear a bit at a specific index to 0.
/// </summary>
/// <param name="bit">The bit index to clear</param>
/// <returns>True if the bit was set, false if it was not</returns>
public bool Clear(int bit)
{
int wordIndex = bit >> IntShift;
int wordBit = bit & IntMask;
long wordMask = 1L << wordBit;
bool wasSet = (Masks[wordIndex] & wordMask) != 0;
Masks[wordIndex] &= ~wordMask;
return wasSet;
}
/// <summary>
/// Clear the bitmap entirely, setting all bits to 0.
/// </summary>
public void Clear()
{
for (int i = 0; i < Masks.Length; i++)
{
Masks[i] = 0;
}
}
}
}

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@ -0,0 +1,161 @@
using System;
using System.Threading;
namespace Ryujinx.Memory.Tracking
{
/// <summary>
/// A bitmap that can be safely modified from multiple threads.
/// </summary>
internal class ConcurrentBitmap
{
public const int IntSize = 64;
public const int IntShift = 6;
public const int IntMask = IntSize - 1;
/// <summary>
/// Masks representing the bitmap. Least significant bit first, 64-bits per mask.
/// </summary>
public readonly long[] Masks;
/// <summary>
/// Create a new multithreaded bitmap.
/// </summary>
/// <param name="count">The number of bits to reserve</param>
/// <param name="set">Whether the bits should be initially set or not</param>
public ConcurrentBitmap(int count, bool set)
{
Masks = new long[(count + IntMask) / IntSize];
if (set)
{
Array.Fill(Masks, -1L);
}
}
/// <summary>
/// Check if any bit in the bitmap is set.
/// </summary>
/// <returns>True if any bits are set, false otherwise</returns>
public bool AnySet()
{
for (int i = 0; i < Masks.Length; i++)
{
if (Volatile.Read(ref Masks[i]) != 0)
{
return true;
}
}
return false;
}
/// <summary>
/// Check if a bit in the bitmap is set.
/// </summary>
/// <param name="bit">The bit index to check</param>
/// <returns>True if the bit is set, false otherwise</returns>
public bool IsSet(int bit)
{
int wordIndex = bit >> IntShift;
int wordBit = bit & IntMask;
long wordMask = 1L << wordBit;
return (Volatile.Read(ref Masks[wordIndex]) & wordMask) != 0;
}
/// <summary>
/// Check if any bit in a range of bits in the bitmap are set. (inclusive)
/// </summary>
/// <param name="start">The first bit index to check</param>
/// <param name="end">The last bit index to check</param>
/// <returns>True if a bit is set, false otherwise</returns>
public bool IsSet(int start, int end)
{
if (start == end)
{
return IsSet(start);
}
int startIndex = start >> IntShift;
int startBit = start & IntMask;
long startMask = -1L << startBit;
int endIndex = end >> IntShift;
int endBit = end & IntMask;
long endMask = (long)(ulong.MaxValue >> (IntMask - endBit));
long startValue = Volatile.Read(ref Masks[startIndex]);
if (startIndex == endIndex)
{
return (startValue & startMask & endMask) != 0;
}
if ((startValue & startMask) != 0)
{
return true;
}
for (int i = startIndex + 1; i < endIndex; i++)
{
if (Volatile.Read(ref Masks[i]) != 0)
{
return true;
}
}
long endValue = Volatile.Read(ref Masks[endIndex]);
if ((endValue & endMask) != 0)
{
return true;
}
return false;
}
/// <summary>
/// Set a bit at a specific index to either true or false.
/// </summary>
/// <param name="bit">The bit index to set</param>
/// <param name="value">Whether the bit should be set or not</param>
public void Set(int bit, bool value)
{
int wordIndex = bit >> IntShift;
int wordBit = bit & IntMask;
long wordMask = 1L << wordBit;
long existing;
long newValue;
do
{
existing = Volatile.Read(ref Masks[wordIndex]);
if (value)
{
newValue = existing | wordMask;
}
else
{
newValue = existing & ~wordMask;
}
}
while (Interlocked.CompareExchange(ref Masks[wordIndex], newValue, existing) != existing);
}
/// <summary>
/// Clear the bitmap entirely, setting all bits to 0.
/// </summary>
public void Clear()
{
for (int i = 0; i < Masks.Length; i++)
{
Volatile.Write(ref Masks[i], 0);
}
}
}
}

View file

@ -176,6 +176,26 @@ namespace Ryujinx.Memory.Tracking
}
}
/// <summary>
/// Obtains a memory tracking handle for the given virtual region. This should be disposed when finished with.
/// </summary>
/// <param name="address">CPU virtual address of the region</param>
/// <param name="size">Size of the region</param>
/// <param name="bitmap">The bitmap owning the dirty flag for this handle</param>
/// <param name="bit">The bit of this handle within the dirty flag</param>
/// <returns>The memory tracking handle</returns>
internal RegionHandle BeginTrackingBitmap(ulong address, ulong size, ConcurrentBitmap bitmap, int bit)
{
(address, size) = PageAlign(address, size);
lock (TrackingLock)
{
RegionHandle handle = new RegionHandle(this, address, size, bitmap, bit, _memoryManager.IsRangeMapped(address, size));
return handle;
}
}
/// <summary>
/// Signal that a virtual memory event happened at the given location (one byte).
/// </summary>

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@ -1,11 +1,15 @@
using System;
using System.Collections.Generic;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Threading;
namespace Ryujinx.Memory.Tracking
{
/// <summary>
/// A region handle that tracks a large region using many smaller handles, to provide
/// granular tracking that can be used to track partial updates.
/// granular tracking that can be used to track partial updates. Backed by a bitmap
/// to improve performance when scanning large regions.
/// </summary>
public class MultiRegionHandle : IMultiRegionHandle
{
@ -17,6 +21,12 @@ namespace Ryujinx.Memory.Tracking
private readonly ulong Granularity;
private readonly ulong Size;
private ConcurrentBitmap _dirtyBitmap;
private int _sequenceNumber;
private BitMap _sequenceNumberBitmap;
private int _uncheckedHandles;
public bool Dirty { get; private set; } = true;
internal MultiRegionHandle(MemoryTracking tracking, ulong address, ulong size, IEnumerable<IRegionHandle> handles, ulong granularity)
@ -24,6 +34,9 @@ namespace Ryujinx.Memory.Tracking
_handles = new RegionHandle[size / granularity];
Granularity = granularity;
_dirtyBitmap = new ConcurrentBitmap(_handles.Length, true);
_sequenceNumberBitmap = new BitMap(_handles.Length);
int i = 0;
if (handles != null)
@ -40,37 +53,43 @@ namespace Ryujinx.Memory.Tracking
// Fill any gap left before this handle.
while (i < startIndex)
{
RegionHandle fillHandle = tracking.BeginTracking(address + (ulong)i * granularity, granularity);
RegionHandle fillHandle = tracking.BeginTrackingBitmap(address + (ulong)i * granularity, granularity, _dirtyBitmap, i);
fillHandle.Parent = this;
_handles[i++] = fillHandle;
}
if (handle.Size == granularity)
lock (tracking.TrackingLock)
{
handle.Parent = this;
_handles[i++] = handle;
}
else
{
int endIndex = (int)((handle.EndAddress - address) / granularity);
while (i < endIndex)
if (handle is RegionHandle bitHandle && handle.Size == granularity)
{
RegionHandle splitHandle = tracking.BeginTracking(address + (ulong)i * granularity, granularity);
splitHandle.Parent = this;
handle.Parent = this;
splitHandle.Reprotect(handle.Dirty);
bitHandle.ReplaceBitmap(_dirtyBitmap, i);
RegionSignal signal = handle.PreAction;
if (signal != null)
_handles[i++] = bitHandle;
}
else
{
int endIndex = (int)((handle.EndAddress - address) / granularity);
while (i < endIndex)
{
splitHandle.RegisterAction(signal);
RegionHandle splitHandle = tracking.BeginTrackingBitmap(address + (ulong)i * granularity, granularity, _dirtyBitmap, i);
splitHandle.Parent = this;
splitHandle.Reprotect(handle.Dirty);
RegionSignal signal = handle.PreAction;
if (signal != null)
{
splitHandle.RegisterAction(signal);
}
_handles[i++] = splitHandle;
}
_handles[i++] = splitHandle;
handle.Dispose();
}
handle.Dispose();
}
}
}
@ -78,15 +97,27 @@ namespace Ryujinx.Memory.Tracking
// Fill any remaining space with new handles.
while (i < _handles.Length)
{
RegionHandle handle = tracking.BeginTracking(address + (ulong)i * granularity, granularity);
RegionHandle handle = tracking.BeginTrackingBitmap(address + (ulong)i * granularity, granularity, _dirtyBitmap, i);
handle.Parent = this;
_handles[i++] = handle;
}
_uncheckedHandles = _handles.Length;
Address = address;
Size = size;
}
public void SignalWrite()
{
Dirty = true;
}
public IEnumerable<RegionHandle> GetHandles()
{
return _handles;
}
public void ForceDirty(ulong address, ulong size)
{
Dirty = true;
@ -96,21 +127,15 @@ namespace Ryujinx.Memory.Tracking
for (int i = startHandle; i <= lastHandle; i++)
{
_handles[i].SequenceNumber--;
if (_sequenceNumberBitmap.Clear(i))
{
_uncheckedHandles++;
}
_handles[i].ForceDirty();
}
}
public IEnumerable<RegionHandle> GetHandles()
{
return _handles;
}
public void SignalWrite()
{
Dirty = true;
}
public void QueryModified(Action<ulong, ulong> modifiedAction)
{
if (!Dirty)
@ -123,33 +148,95 @@ namespace Ryujinx.Memory.Tracking
QueryModified(Address, Size, modifiedAction);
}
public void QueryModified(ulong address, ulong size, Action<ulong, ulong> modifiedAction)
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ParseDirtyBits(long dirtyBits, ref int baseBit, ref int prevHandle, ref ulong rgStart, ref ulong rgSize, Action<ulong, ulong> modifiedAction)
{
int startHandle = (int)((address - Address) / Granularity);
int lastHandle = (int)((address + (size - 1) - Address) / Granularity);
ulong rgStart = _handles[startHandle].Address;
ulong rgSize = 0;
for (int i = startHandle; i <= lastHandle; i++)
while (dirtyBits != 0)
{
RegionHandle handle = _handles[i];
int bit = BitOperations.TrailingZeroCount(dirtyBits);
dirtyBits &= ~(1L << bit);
int handleIndex = baseBit + bit;
RegionHandle handle = _handles[handleIndex];
if (handleIndex != prevHandle + 1)
{
// Submit handles scanned until the gap as dirty
if (rgSize != 0)
{
modifiedAction(rgStart, rgSize);
rgSize = 0;
}
rgStart = handle.Address;
}
if (handle.Dirty)
{
rgSize += handle.Size;
handle.Reprotect();
}
else
prevHandle = handleIndex;
}
baseBit += ConcurrentBitmap.IntSize;
}
public void QueryModified(ulong address, ulong size, Action<ulong, ulong> modifiedAction)
{
int startHandle = (int)((address - Address) / Granularity);
int lastHandle = (int)((address + (size - 1) - Address) / Granularity);
ulong rgStart = _handles[startHandle].Address;
if (startHandle == lastHandle)
{
RegionHandle handle = _handles[startHandle];
if (handle.Dirty)
{
// Submit the region scanned so far as dirty
if (rgSize != 0)
{
modifiedAction(rgStart, rgSize);
rgSize = 0;
}
rgStart = handle.EndAddress;
handle.Reprotect();
modifiedAction(rgStart, handle.Size);
}
return;
}
ulong rgSize = 0;
long[] masks = _dirtyBitmap.Masks;
int startIndex = startHandle >> ConcurrentBitmap.IntShift;
int startBit = startHandle & ConcurrentBitmap.IntMask;
long startMask = -1L << startBit;
int endIndex = lastHandle >> ConcurrentBitmap.IntShift;
int endBit = lastHandle & ConcurrentBitmap.IntMask;
long endMask = (long)(ulong.MaxValue >> (ConcurrentBitmap.IntMask - endBit));
long startValue = Volatile.Read(ref masks[startIndex]);
int baseBit = startIndex << ConcurrentBitmap.IntShift;
int prevHandle = startHandle - 1;
if (startIndex == endIndex)
{
ParseDirtyBits(startValue & startMask & endMask, ref baseBit, ref prevHandle, ref rgStart, ref rgSize, modifiedAction);
}
else
{
ParseDirtyBits(startValue & startMask, ref baseBit, ref prevHandle, ref rgStart, ref rgSize, modifiedAction);
for (int i = startIndex + 1; i < endIndex; i++)
{
ParseDirtyBits(Volatile.Read(ref masks[i]), ref baseBit, ref prevHandle, ref rgStart, ref rgSize, modifiedAction);
}
long endValue = Volatile.Read(ref masks[endIndex]);
ParseDirtyBits(endValue & endMask, ref baseBit, ref prevHandle, ref rgStart, ref rgSize, modifiedAction);
}
if (rgSize != 0)
@ -158,35 +245,120 @@ namespace Ryujinx.Memory.Tracking
}
}
public void QueryModified(ulong address, ulong size, Action<ulong, ulong> modifiedAction, int sequenceNumber)
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void ParseDirtyBits(long dirtyBits, long mask, int index, long[] seqMasks, ref int baseBit, ref int prevHandle, ref ulong rgStart, ref ulong rgSize, Action<ulong, ulong> modifiedAction)
{
int startHandle = (int)((address - Address) / Granularity);
int lastHandle = (int)((address + (size - 1) - Address) / Granularity);
long seqMask = mask & ~seqMasks[index];
dirtyBits &= seqMask;
ulong rgStart = _handles[startHandle].Address;
ulong rgSize = 0;
for (int i = startHandle; i <= lastHandle; i++)
while (dirtyBits != 0)
{
RegionHandle handle = _handles[i];
int bit = BitOperations.TrailingZeroCount(dirtyBits);
if (sequenceNumber != handle.SequenceNumber && handle.DirtyOrVolatile())
dirtyBits &= ~(1L << bit);
int handleIndex = baseBit + bit;
RegionHandle handle = _handles[handleIndex];
if (handleIndex != prevHandle + 1)
{
rgSize += handle.Size;
handle.Reprotect();
}
else
{
// Submit the region scanned so far as dirty
// Submit handles scanned until the gap as dirty
if (rgSize != 0)
{
modifiedAction(rgStart, rgSize);
rgSize = 0;
}
rgStart = handle.EndAddress;
rgStart = handle.Address;
}
handle.SequenceNumber = sequenceNumber;
rgSize += handle.Size;
handle.Reprotect();
prevHandle = handleIndex;
}
seqMasks[index] |= mask;
_uncheckedHandles -= BitOperations.PopCount((ulong)seqMask);
baseBit += ConcurrentBitmap.IntSize;
}
public void QueryModified(ulong address, ulong size, Action<ulong, ulong> modifiedAction, int sequenceNumber)
{
int startHandle = (int)((address - Address) / Granularity);
int lastHandle = (int)((address + (size - 1) - Address) / Granularity);
ulong rgStart = Address + (ulong)startHandle * Granularity;
if (sequenceNumber != _sequenceNumber)
{
if (_uncheckedHandles != _handles.Length)
{
_sequenceNumberBitmap.Clear();
_uncheckedHandles = _handles.Length;
}
_sequenceNumber = sequenceNumber;
}
if (startHandle == lastHandle)
{
var handle = _handles[startHandle];
if (_sequenceNumberBitmap.Set(startHandle))
{
_uncheckedHandles--;
if (handle.DirtyOrVolatile())
{
handle.Reprotect();
modifiedAction(rgStart, handle.Size);
}
}
return;
}
if (_uncheckedHandles == 0)
{
return;
}
ulong rgSize = 0;
long[] seqMasks = _sequenceNumberBitmap.Masks;
long[] masks = _dirtyBitmap.Masks;
int startIndex = startHandle >> ConcurrentBitmap.IntShift;
int startBit = startHandle & ConcurrentBitmap.IntMask;
long startMask = -1L << startBit;
int endIndex = lastHandle >> ConcurrentBitmap.IntShift;
int endBit = lastHandle & ConcurrentBitmap.IntMask;
long endMask = (long)(ulong.MaxValue >> (ConcurrentBitmap.IntMask - endBit));
long startValue = Volatile.Read(ref masks[startIndex]);
int baseBit = startIndex << ConcurrentBitmap.IntShift;
int prevHandle = startHandle - 1;
if (startIndex == endIndex)
{
ParseDirtyBits(startValue, startMask & endMask, startIndex, seqMasks, ref baseBit, ref prevHandle, ref rgStart, ref rgSize, modifiedAction);
}
else
{
ParseDirtyBits(startValue, startMask, startIndex, seqMasks, ref baseBit, ref prevHandle, ref rgStart, ref rgSize, modifiedAction);
for (int i = startIndex + 1; i < endIndex; i++)
{
ParseDirtyBits(Volatile.Read(ref masks[i]), -1L, i, seqMasks, ref baseBit, ref prevHandle, ref rgStart, ref rgSize, modifiedAction);
}
long endValue = Volatile.Read(ref masks[endIndex]);
ParseDirtyBits(endValue, endMask, endIndex, seqMasks, ref baseBit, ref prevHandle, ref rgStart, ref rgSize, modifiedAction);
}
if (rgSize != 0)

View file

@ -1,5 +1,4 @@
using Ryujinx.Memory.Range;
using System;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
@ -10,7 +9,7 @@ namespace Ryujinx.Memory.Tracking
/// A tracking handle for a given region of virtual memory. The Dirty flag is updated whenever any changes are made,
/// and an action can be performed when the region is read to or written from.
/// </summary>
public class RegionHandle : IRegionHandle, IRange
public class RegionHandle : IRegionHandle
{
/// <summary>
/// If more than this number of checks have been performed on a dirty flag since its last reprotect,
@ -23,7 +22,20 @@ namespace Ryujinx.Memory.Tracking
/// </summary>
private static int VolatileThreshold = 5;
public bool Dirty { get; private set; }
public bool Dirty
{
get
{
return Bitmap.IsSet(DirtyBit);
}
protected set
{
Bitmap.Set(DirtyBit, value);
}
}
internal int SequenceNumber { get; set; }
public bool Unmapped { get; private set; }
public ulong Address { get; }
@ -31,7 +43,6 @@ namespace Ryujinx.Memory.Tracking
public ulong EndAddress { get; }
internal IMultiRegionHandle Parent { get; set; }
internal int SequenceNumber { get; set; }
private event Action _onDirty;
@ -68,17 +79,26 @@ namespace Ryujinx.Memory.Tracking
internal RegionSignal PreAction => _preAction;
internal ConcurrentBitmap Bitmap;
internal int DirtyBit;
/// <summary>
/// Create a new region handle. The handle is registered with the given tracking object,
/// Create a new bitmap backed region handle. The handle is registered with the given tracking object,
/// and will be notified of any changes to the specified region.
/// </summary>
/// <param name="tracking">Tracking object for the target memory block</param>
/// <param name="address">Virtual address of the region to track</param>
/// <param name="size">Size of the region to track</param>
/// <param name="bitmap">The bitmap the dirty flag for this handle is stored in</param>
/// <param name="bit">The bit index representing the dirty flag for this handle</param>
/// <param name="mapped">True if the region handle starts mapped</param>
internal RegionHandle(MemoryTracking tracking, ulong address, ulong size, bool mapped = true)
internal RegionHandle(MemoryTracking tracking, ulong address, ulong size, ConcurrentBitmap bitmap, int bit, bool mapped = true)
{
Bitmap = bitmap;
DirtyBit = bit;
Dirty = mapped;
Unmapped = !mapped;
Address = address;
Size = size;
@ -92,6 +112,54 @@ namespace Ryujinx.Memory.Tracking
}
}
/// <summary>
/// Create a new region handle. The handle is registered with the given tracking object,
/// and will be notified of any changes to the specified region.
/// </summary>
/// <param name="tracking">Tracking object for the target memory block</param>
/// <param name="address">Virtual address of the region to track</param>
/// <param name="size">Size of the region to track</param>
/// <param name="mapped">True if the region handle starts mapped</param>
internal RegionHandle(MemoryTracking tracking, ulong address, ulong size, bool mapped = true)
{
Bitmap = new ConcurrentBitmap(1, mapped);
Unmapped = !mapped;
Address = address;
Size = size;
EndAddress = address + size;
_tracking = tracking;
_regions = tracking.GetVirtualRegionsForHandle(address, size);
foreach (var region in _regions)
{
region.Handles.Add(this);
}
}
/// <summary>
/// Replace the bitmap and bit index used to track dirty state.
/// </summary>
/// <remarks>
/// The tracking lock should be held when this is called, to ensure neither bitmap is modified.
/// </remarks>
/// <param name="bitmap">The bitmap the dirty flag for this handle is stored in</param>
/// <param name="bit">The bit index representing the dirty flag for this handle</param>
internal void ReplaceBitmap(ConcurrentBitmap bitmap, int bit)
{
// Assumes the tracking lock is held, so nothing else can signal right now.
var oldBitmap = Bitmap;
var oldBit = DirtyBit;
bitmap.Set(bit, Dirty);
Bitmap = bitmap;
DirtyBit = bit;
Dirty |= oldBitmap.IsSet(oldBit);
}
/// <summary>
/// Clear the volatile state of this handle.
/// </summary>
@ -108,7 +176,7 @@ namespace Ryujinx.Memory.Tracking
public bool DirtyOrVolatile()
{
_checkCount++;
return Dirty || _volatile;
return _volatile || Dirty;
}
/// <summary>
@ -195,6 +263,8 @@ namespace Ryujinx.Memory.Tracking
/// </summary>
public void ForceDirty()
{
_checkCount++;
Dirty = true;
}