Remove per connection PipeOptions (#30769)

- This changes the socket transport to remove the per connection allocation of PipeOptions.

Author: davidfowl

src/Servers/Kestrel/Transport.Sockets/src/Client/SocketConnectionFactory.cs

@@ -9,7 +9,6 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Connections;
-using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.Internal;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
@@ -21,6 +20,8 @@ internal class SocketConnectionFactory : IConnectionFactory, IAsyncDisposable
         private readonly SocketTransportOptions _options;
         private readonly MemoryPool<byte> _memoryPool;
         private readonly SocketsTrace _trace;
+        private readonly PipeOptions _inputOptions;
+        private readonly PipeOptions _outputOptions;
 
         public SocketConnectionFactory(IOptions<SocketTransportOptions> options, ILoggerFactory loggerFactory)
         {
@@ -38,6 +39,16 @@ public SocketConnectionFactory(IOptions<SocketTransportOptions> options, ILogger
             _memoryPool = options.Value.MemoryPoolFactory();
             var logger = loggerFactory.CreateLogger("Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.Client");
             _trace = new SocketsTrace(logger);
+
+            var maxReadBufferSize = _options.MaxReadBufferSize ?? 0;
+            var maxWriteBufferSize = _options.MaxWriteBufferSize ?? 0;
+
+            // These are the same, it's either the thread pool or inline
+            var applicationScheduler = _options.UnsafePreferInlineScheduling ? PipeScheduler.Inline : PipeScheduler.ThreadPool;
+            var transportScheduler = applicationScheduler;
+
+            _inputOptions = new PipeOptions(_memoryPool, applicationScheduler, transportScheduler, maxReadBufferSize, maxReadBufferSize / 2, useSynchronizationContext: false);
+            _outputOptions = new PipeOptions(_memoryPool, transportScheduler, applicationScheduler, maxWriteBufferSize, maxWriteBufferSize / 2, useSynchronizationContext: false);
         }
 
         public async ValueTask<ConnectionContext> ConnectAsync(EndPoint endpoint, CancellationToken cancellationToken = default)
@@ -59,12 +70,11 @@ public async ValueTask<ConnectionContext> ConnectAsync(EndPoint endpoint, Cancel
             var socketConnection = new SocketConnection(
                 socket,
                 _memoryPool,
-                PipeScheduler.ThreadPool,
+                _inputOptions.ReaderScheduler, // This is either threadpool or inline
                 _trace,
-                _options.MaxReadBufferSize,
-                _options.MaxWriteBufferSize,
-                _options.WaitForDataBeforeAllocatingBuffer,
-                _options.UnsafePreferInlineScheduling);
+                _inputOptions,
+                _outputOptions,
+                _options.WaitForDataBeforeAllocatingBuffer);
 
             socketConnection.Start();
             return socketConnection;

src/Servers/Kestrel/Transport.Sockets/src/Internal/SocketConnection.cs

@@ -36,10 +36,9 @@ internal SocketConnection(Socket socket,
                                   MemoryPool<byte> memoryPool,
                                   PipeScheduler transportScheduler,
                                   ISocketsTrace trace,
-                                  long? maxReadBufferSize = null,
-                                  long? maxWriteBufferSize = null,
-                                  bool waitForData = true,
-                                  bool useInlineSchedulers = false)
+                                  PipeOptions inputOptions,
+                                  PipeOptions outputOptions,
+                                  bool waitForData = true)
         {
             Debug.Assert(socket != null);
             Debug.Assert(memoryPool != null);
@@ -60,23 +59,9 @@ internal SocketConnection(Socket socket,
             // https://github.com/aspnet/KestrelHttpServer/issues/2573
             var awaiterScheduler = OperatingSystem.IsWindows() ? transportScheduler : PipeScheduler.Inline;
 
-            var applicationScheduler = PipeScheduler.ThreadPool;
-            if (useInlineSchedulers)
-            {
-                transportScheduler = PipeScheduler.Inline;
-                awaiterScheduler = PipeScheduler.Inline;
-                applicationScheduler = PipeScheduler.Inline;
-            }
-
             _receiver = new SocketReceiver(_socket, awaiterScheduler);
             _sender = new SocketSender(_socket, awaiterScheduler);
 
-            maxReadBufferSize ??= 0;
-            maxWriteBufferSize ??= 0;
-
-            var inputOptions = new PipeOptions(MemoryPool, applicationScheduler, transportScheduler, maxReadBufferSize.Value, maxReadBufferSize.Value / 2, useSynchronizationContext: false);
-            var outputOptions = new PipeOptions(MemoryPool, transportScheduler, applicationScheduler, maxWriteBufferSize.Value, maxWriteBufferSize.Value / 2, useSynchronizationContext: false);
-
             var pair = DuplexPipe.CreateConnectionPair(inputOptions, outputOptions);
 
             // Set the transport and connection id

src/Servers/Kestrel/Transport.Sockets/src/SocketConnectionListener.cs

@@ -17,11 +17,11 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets
     internal sealed class SocketConnectionListener : IConnectionListener
     {
         private readonly MemoryPool<byte> _memoryPool;
-        private readonly int _numSchedulers;
-        private readonly PipeScheduler[] _schedulers;
+        private readonly int _settingsCount;
+        private readonly Settings[] _settings;
         private readonly ISocketsTrace _trace;
         private Socket? _listenSocket;
-        private int _schedulerIndex;
+        private int _settingsIndex;
         private readonly SocketTransportOptions _options;
         private SafeSocketHandle? _socketHandle;
 
@@ -38,21 +38,43 @@ internal SocketConnectionListener(
             _memoryPool = _options.MemoryPoolFactory();
             var ioQueueCount = options.IOQueueCount;
 
+            var maxReadBufferSize = _options.MaxReadBufferSize ?? 0;
+            var maxWriteBufferSize = _options.MaxWriteBufferSize ?? 0;
+            var applicationScheduler = options.UnsafePreferInlineScheduling ? PipeScheduler.Inline : PipeScheduler.ThreadPool;
+
             if (ioQueueCount > 0)
             {
-                _numSchedulers = ioQueueCount;
-                _schedulers = new IOQueue[_numSchedulers];
+                _settingsCount = ioQueueCount;
+                _settings = new Settings[_settingsCount];
 
-                for (var i = 0; i < _numSchedulers; i++)
+                for (var i = 0; i < _settingsCount; i++)
                 {
-                    _schedulers[i] = new IOQueue();
+                    var transportScheduler = options.UnsafePreferInlineScheduling ? PipeScheduler.Inline : new IOQueue();
+
+                    _settings[i] = new Settings
+                    {
+                        Scheduler = transportScheduler,
+                        InputOptions = new PipeOptions(_memoryPool, applicationScheduler, transportScheduler, maxReadBufferSize, maxReadBufferSize / 2, useSynchronizationContext: false),
+                        OutputOptions = new PipeOptions(_memoryPool, transportScheduler, applicationScheduler, maxWriteBufferSize, maxWriteBufferSize / 2, useSynchronizationContext: false)
+                    };
                 }
             }
             else
             {
-                var directScheduler = new PipeScheduler[] { PipeScheduler.ThreadPool };
-                _numSchedulers = directScheduler.Length;
-                _schedulers = directScheduler;
+                var transportScheduler = options.UnsafePreferInlineScheduling ? PipeScheduler.Inline : PipeScheduler.ThreadPool;
+
+                var directScheduler = new Settings[]
+                {
+                    new Settings
+                    {
+                        Scheduler = transportScheduler,
+                        InputOptions = new PipeOptions(_memoryPool, applicationScheduler, transportScheduler, maxReadBufferSize, maxReadBufferSize / 2, useSynchronizationContext: false),
+                        OutputOptions = new PipeOptions(_memoryPool, transportScheduler, applicationScheduler, maxWriteBufferSize, maxWriteBufferSize / 2, useSynchronizationContext: false)
+                    }
+                };
+
+                _settingsCount = directScheduler.Length;
+                _settings = directScheduler;
             }
         }
 
@@ -127,13 +149,19 @@ void BindSocket()
                         acceptSocket.NoDelay = _options.NoDelay;
                     }
 
-                    var connection = new SocketConnection(acceptSocket, _memoryPool, _schedulers[_schedulerIndex], _trace,
-                        _options.MaxReadBufferSize, _options.MaxWriteBufferSize, _options.WaitForDataBeforeAllocatingBuffer,
-                        _options.UnsafePreferInlineScheduling);
+                    var setting = _settings[_settingsIndex];
+
+                    var connection = new SocketConnection(acceptSocket,
+                        _memoryPool,
+                        setting.Scheduler,
+                        _trace,
+                        setting.InputOptions,
+                        setting.OutputOptions,
+                        waitForData: _options.WaitForDataBeforeAllocatingBuffer);
 
                     connection.Start();
 
-                    _schedulerIndex = (_schedulerIndex + 1) % _numSchedulers;
+                    _settingsIndex = (_settingsIndex + 1) % _settingsCount;
 
                     return connection;
                 }
@@ -173,5 +201,12 @@ public ValueTask DisposeAsync()
             _memoryPool.Dispose();
             return default;
         }
+
+        private class Settings
+        {
+            public PipeScheduler Scheduler { get; init; } = default!;
+            public PipeOptions InputOptions { get; init; } = default!;
+            public PipeOptions OutputOptions { get; init; } = default!;
+        }
     }
 }