Reducing Memory Allocations 202303 (#4624)

* use ArrayPool, avoid 6000-7000 allocs/sec of runtime

* use ArrayPool, avoid ~7k allocs/second during game execution

* use ArrayPool, avoid ~3000 allocs/sec during game execution

* use MemoryPool, reduce 0.5 MB/sec of new allocations during game execution

* avoid over-allocation by setting List<> Capacity when known

* remove LINQ in KTimeManager.UnscheduleFutureInvocation

* KTimeManager - avoid spinning one more time when the time has arrived

* KTimeManager - let SpinWait decide when to Thread.Yield(), and don't SpinOnce() immediately after Thread.Yield()

* use MemoryPool, reduce ~175k bytes/sec allocation during game execution

* IpcService - call commands via dynamic methods instead of reflection .Invoke(). Faster to call and with fewer allocations because parameters can be passed directly instead of as an array

* Make ButtonMappingEntry a record struct to avoid allocations. Set the List<ButtonMappingEntry> capacity according to use.

* add MemoryBuffer type for working with MemoryPool<byte>

* update changes to use MemoryBuffer

* make parameter ReadOnlySpan instead of Span

* whitespace fix

* Revert "IpcService - call commands via dynamic methods instead of reflection .Invoke(). Faster to call and with fewer allocations because parameters can be passed directly instead of as an array"

This reverts commit f2c698bdf65f049e8481c9f2ec7138d9b9a8261d.

* tweak KTimeManager spin behavior

* replace MemoryBuffer with ByteMemoryPool modeled after System.Buffers.ArrayMemoryPool<T>

* make ByteMemoryPoolBuffer responsible for renting memory

1 files changed, 64 insertions, 59 deletions

diff --git a/Ryujinx.HLE/HOS/Ipc/IpcMessage.cs b/Ryujinx.HLE/HOS/Ipc/IpcMessage.cs
index 394bf888..21630c42 100644
--- a/Ryujinx.HLE/HOS/Ipc/IpcMessage.cs
+++ b/Ryujinx.HLE/HOS/Ipc/IpcMessage.cs
@@ -27,98 +27,103 @@ namespace Ryujinx.HLE.HOS.Ipc
 
         public IpcMessage()
         {
-            PtrBuff      = new List<IpcPtrBuffDesc>();
-            SendBuff     = new List<IpcBuffDesc>();
-            ReceiveBuff  = new List<IpcBuffDesc>();
-            ExchangeBuff = new List<IpcBuffDesc>();
-            RecvListBuff = new List<IpcRecvListBuffDesc>();
+            PtrBuff      = new List<IpcPtrBuffDesc>(0);
+            SendBuff     = new List<IpcBuffDesc>(0);
+            ReceiveBuff  = new List<IpcBuffDesc>(0);
+            ExchangeBuff = new List<IpcBuffDesc>(0);
+            RecvListBuff = new List<IpcRecvListBuffDesc>(0);
 
-            ObjectIds = new List<int>();
+            ObjectIds = new List<int>(0);
         }
 
-        public IpcMessage(ReadOnlySpan<byte> data, long cmdPtr) : this()
+        public IpcMessage(ReadOnlySpan<byte> data, long cmdPtr)
         {
             using (RecyclableMemoryStream ms = MemoryStreamManager.Shared.GetStream(data))
             {
                 BinaryReader reader = new BinaryReader(ms);
 
-                Initialize(reader, cmdPtr);
-            }
-        }
+                int word0 = reader.ReadInt32();
+                int word1 = reader.ReadInt32();
 
-        private void Initialize(BinaryReader reader, long cmdPtr)
-        {
-            int word0 = reader.ReadInt32();
-            int word1 = reader.ReadInt32();
+                Type = (IpcMessageType)(word0 & 0xffff);
 
-            Type = (IpcMessageType)(word0 & 0xffff);
+                int  ptrBuffCount  = (word0 >> 16) & 0xf;
+                int  sendBuffCount = (word0 >> 20) & 0xf;
+                int  recvBuffCount = (word0 >> 24) & 0xf;
+                int  xchgBuffCount = (word0 >> 28) & 0xf;
 
-            int  ptrBuffCount  = (word0 >> 16) & 0xf;
-            int  sendBuffCount = (word0 >> 20) & 0xf;
-            int  recvBuffCount = (word0 >> 24) & 0xf;
-            int  xchgBuffCount = (word0 >> 28) & 0xf;
+                int  rawDataSize   = (word1 >> 0) & 0x3ff;
+                int  recvListFlags = (word1 >> 10) & 0xf;
+                bool hndDescEnable = ((word1 >> 31) & 0x1) != 0;
 
-            int  rawDataSize   =  (word1 >>  0) & 0x3ff;
-            int  recvListFlags =  (word1 >> 10) & 0xf;
-            bool hndDescEnable = ((word1 >> 31) & 0x1) != 0;
+                if (hndDescEnable)
+                {
+                    HandleDesc = new IpcHandleDesc(reader);
+                }
 
-            if (hndDescEnable)
-            {
-                HandleDesc = new IpcHandleDesc(reader);
-            }
+                PtrBuff = new List<IpcPtrBuffDesc>(ptrBuffCount);
 
-            for (int index = 0; index < ptrBuffCount; index++)
-            {
-                PtrBuff.Add(new IpcPtrBuffDesc(reader));
-            }
+                for (int index = 0; index < ptrBuffCount; index++)
+                {
+                    PtrBuff.Add(new IpcPtrBuffDesc(reader));
+                }
 
-            void ReadBuff(List<IpcBuffDesc> buff, int count)
-            {
-                for (int index = 0; index < count; index++)
+                static List<IpcBuffDesc> ReadBuff(BinaryReader reader, int count)
                 {
-                    buff.Add(new IpcBuffDesc(reader));
+                    List<IpcBuffDesc> buff = new List<IpcBuffDesc>(count);
+                    
+                    for (int index = 0; index < count; index++)
+                    {
+                        buff.Add(new IpcBuffDesc(reader));
+                    }
+                    
+                    return buff;
                 }
-            }
 
-            ReadBuff(SendBuff,     sendBuffCount);
-            ReadBuff(ReceiveBuff,  recvBuffCount);
-            ReadBuff(ExchangeBuff, xchgBuffCount);
+                SendBuff = ReadBuff(reader, sendBuffCount);
+                ReceiveBuff = ReadBuff(reader, recvBuffCount);
+                ExchangeBuff = ReadBuff(reader, xchgBuffCount);
 
-            rawDataSize *= 4;
+                rawDataSize *= 4;
 
-            long recvListPos = reader.BaseStream.Position + rawDataSize;
+                long recvListPos = reader.BaseStream.Position + rawDataSize;
 
             // Only CMIF has the padding requirements.
             if (Type < IpcMessageType.TipcCloseSession)
             {
                 long pad0 = GetPadSize16(reader.BaseStream.Position + cmdPtr);
 
-                if (rawDataSize != 0)
-                {
-                    rawDataSize -= (int)pad0;
+                    if (rawDataSize != 0)
+                    {
+                        rawDataSize -= (int)pad0;
+                    }
+
+                    reader.BaseStream.Seek(pad0, SeekOrigin.Current);
                 }
 
-                reader.BaseStream.Seek(pad0, SeekOrigin.Current);
-            }
+                int recvListCount = recvListFlags - 2;
 
-            int recvListCount = recvListFlags - 2;
+                if (recvListCount == 0)
+                {
+                    recvListCount = 1;
+                }
+                else if (recvListCount < 0)
+                {
+                    recvListCount = 0;
+                }
 
-            if (recvListCount == 0)
-            {
-                recvListCount = 1;
-            }
-            else if (recvListCount < 0)
-            {
-                recvListCount = 0;
-            }
+                RawData = reader.ReadBytes(rawDataSize);
 
-            RawData = reader.ReadBytes(rawDataSize);
+                reader.BaseStream.Seek(recvListPos, SeekOrigin.Begin);
 
-            reader.BaseStream.Seek(recvListPos, SeekOrigin.Begin);
+                RecvListBuff = new List<IpcRecvListBuffDesc>(recvListCount);
 
-            for (int index = 0; index < recvListCount; index++)
-            {
-                RecvListBuff.Add(new IpcRecvListBuffDesc(reader.ReadUInt64()));
+                for (int index = 0; index < recvListCount; index++)
+                {
+                    RecvListBuff.Add(new IpcRecvListBuffDesc(reader.ReadUInt64()));
+                }
+
+                ObjectIds = new List<int>(0);
             }
         }