diff --git a/src/System.Private.CoreLib/System.Private.CoreLib.csproj b/src/System.Private.CoreLib/System.Private.CoreLib.csproj
index dd4dbb25b302..d5402b786224 100644
--- a/src/System.Private.CoreLib/System.Private.CoreLib.csproj
+++ b/src/System.Private.CoreLib/System.Private.CoreLib.csproj
@@ -167,7 +167,6 @@
     <Compile Include="$(BclSourcesRoot)\System\IO\Stream.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Math.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\MathF.CoreCLR.cs" />
-    <Compile Include="$(BclSourcesRoot)\System\mda.cs" />
     <Compile Include="$(BclSourcesRoot)\System\MissingMemberException.CoreCLR.cs" />
     <Compile Include="$(BclSourcesRoot)\System\MulticastDelegate.cs" />
     <Compile Include="$(BclSourcesRoot)\System\Object.CoreCLR.cs" />
diff --git a/src/System.Private.CoreLib/src/System/RtType.cs b/src/System.Private.CoreLib/src/System/RtType.cs
index 3af3bfa5150f..4f48866ef5dc 100644
--- a/src/System.Private.CoreLib/src/System/RtType.cs
+++ b/src/System.Private.CoreLib/src/System/RtType.cs
@@ -231,9 +231,6 @@ private class MemberInfoCache<T> where T : MemberInfo
 
                 internal MemberInfoCache(RuntimeTypeCache runtimeTypeCache)
                 {
-#if MDA_SUPPORTED
-                    Mda.MemberInfoCacheCreation();
-#endif
                     m_runtimeTypeCache = runtimeTypeCache;
                 }
 
diff --git a/src/System.Private.CoreLib/src/System/StubHelpers.cs b/src/System.Private.CoreLib/src/System/StubHelpers.cs
index 330bfe731dba..972a30c32b3d 100644
--- a/src/System.Private.CoreLib/src/System/StubHelpers.cs
+++ b/src/System.Private.CoreLib/src/System/StubHelpers.cs
@@ -1639,15 +1639,9 @@ internal static void SafeHandleRelease(SafeHandle pHandle)
             {
                 pHandle.DangerousRelease();
             }
-#if MDA_SUPPORTED
-            catch (Exception ex)
+            catch
             {
-                Mda.ReportErrorSafeHandleRelease(ex);
             }
-#else // MDA_SUPPORTED
-            catch (Exception)
-            { }
-#endif // MDA_SUPPORTED
         }
 
 #if FEATURE_COMINTEROP
diff --git a/src/System.Private.CoreLib/src/System/mda.cs b/src/System.Private.CoreLib/src/System/mda.cs
deleted file mode 100644
index c529a7439305..000000000000
--- a/src/System.Private.CoreLib/src/System/mda.cs
+++ /dev/null
@@ -1,71 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-
-using System.Runtime.CompilerServices;
-using System.Runtime.Versioning;
-
-namespace System
-{
-#if MDA_SUPPORTED
-    internal static class Mda
-    {
-        internal static class StreamWriterBufferedDataLost
-        {
-            // State: 0 (not queried); 1 (enabled); 2 (disabled)
-            private static volatile int _enabledState;
-            private static volatile int _captureAllocatedCallStackState;
-
-            internal static bool Enabled {
-                get {
-                    if (_enabledState == 0) {
-                        if (Mda.IsStreamWriterBufferedDataLostEnabled())
-                            _enabledState = 1;
-                        else
-                            _enabledState = 2;
-                    }
-
-                    return (_enabledState == 1);
-                }
-            }
-
-            internal static bool CaptureAllocatedCallStack {
-                get {
-                    if (_captureAllocatedCallStackState == 0) {
-                        if (Mda.IsStreamWriterBufferedDataLostCaptureAllocatedCallStack())
-                            _captureAllocatedCallStackState = 1;
-                        else
-                            _captureAllocatedCallStackState = 2;
-                    }
-
-                    return (_captureAllocatedCallStackState == 1);
-                }
-            }
-
-            internal static void ReportError(String text) {
-                Mda.ReportStreamWriterBufferedDataLost(text);
-            }
-
-        }
-
-        [MethodImplAttribute(MethodImplOptions.InternalCall)]
-        internal static extern void ReportStreamWriterBufferedDataLost(String text);
-
-        [MethodImplAttribute(MethodImplOptions.InternalCall)]
-        internal static extern bool IsStreamWriterBufferedDataLostEnabled();
-
-        [MethodImplAttribute(MethodImplOptions.InternalCall)]
-        internal static extern bool IsStreamWriterBufferedDataLostCaptureAllocatedCallStack();
-
-        [MethodImplAttribute(MethodImplOptions.InternalCall)]
-        internal static extern void MemberInfoCacheCreation();
-
-        [MethodImplAttribute(MethodImplOptions.InternalCall)]
-        internal static extern void DateTimeInvalidLocalFormat();
-
-        [MethodImplAttribute(MethodImplOptions.InternalCall)]
-        internal static extern void ReportErrorSafeHandleRelease(Exception ex);
-    }
-#endif
-}
diff --git a/src/dlls/mscorrc/mscorrc.rc b/src/dlls/mscorrc/mscorrc.rc
index a0616a2e67ea..6717d6870369 100644
--- a/src/dlls/mscorrc/mscorrc.rc
+++ b/src/dlls/mscorrc/mscorrc.rc
@@ -242,11 +242,6 @@ LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
     L"from unmanaged to managed where an LCID was used to specify the culture for the call. This will "     \
     L"cause the thread's culture to remain set to the one associated with the LCID. The cause of the failure was: %1$s"  
 
-#define MDARC_MARSHALCLEANUPERROR_SAFEHANDLERELEASE_MSG                                                     \
-    L"The CLR marshaler encountered an error while attempting to release the reference to a SafeHandle "    \
-    L"it acquired in order to marshal the SafeHandle to an unmanaged pointer during a call from managed to unmanaged. " \
-    L"This may cause the unmanaged resource the SafeHandle represents to be leaked. The cause of the failure was: %1$s"  
-
 #define MDARC_MARSHALCLEANUPERROR_SAFEHANDLEPROP_MSG                                                        \
     L"The CLR marshaler encountered an error while attempting to associate a SafeHandle with an unmanaged resource. " \
     L"This may cause the unmanaged resource to be leaked. The cause of the failure was: %1$s"  
@@ -265,9 +260,6 @@ LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
     L"Function DllMain, called with reason DLL_PROCESS_ATTACH, returned FALSE. DLL initialization failed. " \
     L"To ignore the DllMain return, set Registry value "                                                    \
     L"HKEY_LOCAL_MACHINE\\Software\\Microsoft\\.NETFramework\\IgnoreDllMainReturn to 1"
-
-#define MDARC_REFLECTION_PERFORMANCE_MEMBERINFOCACHECREATION_MSG                                            \
-    L"Reflection has created a memberInfo cache."
     
 #define MDARC_INVALID_MEMBER_DECLARATION_MSG                                                                \
     L"The following error occurred while determining how to marshal the parameters of member '%1$s' of type '%2$s': " \
@@ -288,16 +280,6 @@ LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
 #define MDARC_DANGEROUS_THREADINGAPI_MSG                                                                    \
     L"User code has attempted to call the following API: '%1$s'. This may result in a deadlock in the process."
 
-#define MDARC_DATETIME_INVALID_LOCAL_FORMAT_MSG                                                             \
-    L"A UTC DateTime is being converted to text in a format that is only correct for local times. "         \
-    L"This can happen when calling DateTime.ToString using the 'z' format specifier, which will "     \
-    L"include a local time zone offset in the output. In that case, either use the 'Z' format specifier, "  \
-    L"which designates a UTC time, or use the 'o' format string, which is the recommended way to persist "  \
-    L"a DateTime in text. This can also occur when passing a DateTime to be serialized by "                 \
-    L"XmlConvert or DataSet. If using XmlConvert.ToString, pass in "                                        \
-    L"XmlDateTimeSerializationMode.RoundtripKind to serialize correctly. If using DataSet, set the "        \
-    L"DateTimeMode on the DataColumn object to DataSetDateTime.Utc. "                                  
-
 #define MDARC_NON_COMVISIBLE_BASE_CLASS_CLASSITF_MSG                                                        \
     L"A QueryInterface call was made requesting the class interface of COM visible managed class '%1$s'. "  \
     L"However since this class derives from non COM visible class '%2$s', the QueryInterface call will fail. " \
@@ -310,16 +292,6 @@ LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
     L"COM visible class '%2$s', the QueryInterface call will fail. This is done to prevent the non COM "    \
     L"visible base class from being constrained by the COM versioning rules."    
 
-#define MDARC_INVALID_GCHANDLE_COOKIE_MSG                                                                   \
-    L"An attempt was made to retrieve a GCHandle from an invalid IntPtr cookie (0x%1$x). "                  \
-    L"The cookie was most likely invalid because the cookie does not represent a GCHandle, "                \
-    L"the GCHandle has already been freed, "                                                                \
-    L"the retrieval was attempted in the wrong AppDomain, "                                                 \
-    L"or the GCHandle was marshaled to native code as a GCHandle but passed back into "                     \
-    L"managed code as an IntPtr where a cast was attempted. " \
-    L"Attempting to use an invalid pointer to reclaim a GC handle can cause unexpected exceptions, crashes, " \
-    L"corruption or data loss. "
-
 #define MDARC_FATAL_EXECUTION_ENGINE_ERROR_MSG \
     L"The runtime has encountered a fatal error. The address of the error was at 0x%1$08x, on thread 0x%2$x. "\
     L"The error code is 0x%3$08x. This error may be a bug in the CLR or in the unsafe "                     \
@@ -366,7 +338,6 @@ BEGIN
     MDARC_DISCONNECTED_CONTEXT_2                MDARC_DISCONNECTED_CONTEXT_2_MSG
     MDARC_NOTMARSHALABLE                        MDARC_NOTMARSHALABLE_MSG
     MDARC_MARSHALCLEANUPERROR_THREADCULTURE     MDARC_MARSHALCLEANUPERROR_THREADCULTURE_MSG
-    MDARC_MARSHALCLEANUPERROR_SAFEHANDLERELEASE MDARC_MARSHALCLEANUPERROR_SAFEHANDLERELEASE_MSG
     MDARC_MARSHALCLEANUPERROR_SAFEHANDLEPROP    MDARC_MARSHALCLEANUPERROR_SAFEHANDLEPROP_MSG
     MDARC_MARSHALCLEANUPERROR_CUSTOMCLEANUP     MDARC_MARSHALCLEANUPERROR_CUSTOMCLEANUP_MSG
     MDARC_INVALID_IUNKNOWN                      MDARC_INVALID_IUNKNOWN_MSG
@@ -380,14 +351,11 @@ BEGIN
     MDARC_OPENGENERIC_CER_CALL                  MDARC_OPENGENERIC_CER_CALL_MSG
     MDARC_ILLEGAL_PCR                           MDARC_ILLEGAL_PCR_MSG
     MDARC_SAFEHANDLE_CRITICAL_FAILURE           MDARC_SAFEHANDLE_CRITICAL_FAILURE_MSG
-    MDARC_REFLECTION_PERFORMANCE_MEMBERINFOCACHECREATION            MDARC_REFLECTION_PERFORMANCE_MEMBERINFOCACHECREATION_MSG
-    MDARC_DATETIME_INVALID_LOCAL_FORMAT         MDARC_DATETIME_INVALID_LOCAL_FORMAT_MSG
     MDARC_DLLMAIN_RETURNS_FALSE                 MDARC_DLLMAIN_RETURNS_FALSE_MSG
     MDARC_INVALID_MEMBER_DECLARATION            MDARC_INVALID_MEMBER_DECLARATION_MSG
     MDARC_EXCEPTION_SWALLOWED_COM_TO_CLR        MDARC_EXCEPTION_SWALLOWED_COM_TO_CLR_MSG
     MDARC_NON_COMVISIBLE_BASE_CLASS_CLASSITF    MDARC_NON_COMVISIBLE_BASE_CLASS_CLASSITF_MSG  
     MDARC_NON_COMVISIBLE_BASE_CLASS_IDISPATCH   MDARC_NON_COMVISIBLE_BASE_CLASS_IDISPATCH_MSG  
-    MDARC_INVALID_GCHANDLE_COOKIE               MDARC_INVALID_GCHANDLE_COOKIE_MSG
     MDARC_PINVOKE_LOG                           MDARC_PINVOKE_LOG_MSG
     MDARC_FATAL_EXECUTION_ENGINE_ERROR          MDARC_FATAL_EXECUTION_ENGINE_ERROR_MSG
     MDARC_INVALID_OVERLAPPED_TO_PINVOKE         MDARC_INVALID_OVERLAPPED_TO_PINVOKE_MSG
diff --git a/src/dlls/mscorrc/resource.h b/src/dlls/mscorrc/resource.h
index 6d137f75bd8b..cbd03b6271b7 100644
--- a/src/dlls/mscorrc/resource.h
+++ b/src/dlls/mscorrc/resource.h
@@ -46,25 +46,21 @@
 #define MDARC_OPENGENERIC_CER_CALL              0x1913
 #define MDARC_ILLEGAL_PCR                       0x1914
 #define MDARC_MARSHALCLEANUPERROR_THREADCULTURE     0x1915
-#define MDARC_MARSHALCLEANUPERROR_SAFEHANDLERELEASE 0x1916
 #define MDARC_MARSHALCLEANUPERROR_SAFEHANDLEPROP    0x1917
 #define MDARC_MARSHALCLEANUPERROR_CUSTOMCLEANUP     0x1918
 #define MDARC_SAFEHANDLE_CRITICAL_FAILURE       0x1919
 #define MDARC_DLLMAIN_RETURNS_FALSE             0x191A
-#define MDARC_REFLECTION_PERFORMANCE_MEMBERINFOCACHECREATION 0x191B
 #define MDARC_DOCUMENTATION                     0x191E
 #define MDARC_ASYNCHRONOUS_THREADABORT          0x191F
 #define MDARC_LOAD_FROM_CONTEXT                 0x1920
 #define MDARC_CONTEXT_SWITCH_DEADLOCK           0x1921
 #define MDARC_RCW_CLEANUP_RACE                  0x1923
-#define MDARC_DATETIME_INVALID_LOCAL_FORMAT     0x1924
 #define MDARC_INVALID_MEMBER_DECLARATION        0x1925
 #define MDARC_EXCEPTION_SWALLOWED_COM_TO_CLR    0x1926
 #define MDARC_REENTRANCY                        0x1928
 #define MDARC_NON_COMVISIBLE_BASE_CLASS_CLASSITF 0x1929
 #define MDARC_NON_COMVISIBLE_BASE_CLASS_IDISPATCH 0x192A
 #define MDARC_BINDING_FAILURE                   0x192B
-#define MDARC_INVALID_GCHANDLE_COOKIE           0x192C
 #define MDARC_REPORT_AV_ON_COM_RELEASE_WITH_VTABLE 0x192D
 #define MDARC_PINVOKE_LOG                       0x192E
 #define MDARC_FATAL_EXECUTION_ENGINE_ERROR      0x192F
diff --git a/src/vm/ecalllist.h b/src/vm/ecalllist.h
index aff7025f4b7a..9d3a7e91091d 100644
--- a/src/vm/ecalllist.h
+++ b/src/vm/ecalllist.h
@@ -545,19 +545,6 @@ FCFuncStart(gAssemblyBuilderFuncs)
     FCFuncElement("GetInMemoryAssemblyModule", AssemblyNative::GetInMemoryAssemblyModule)
 FCFuncEnd()
 
-#ifdef MDA_SUPPORTED
-FCFuncStart(gMda)
-    FCFuncElement("MemberInfoCacheCreation", MdaManagedSupport::MemberInfoCacheCreation)
-    FCFuncElement("DateTimeInvalidLocalFormat", MdaManagedSupport::DateTimeInvalidLocalFormat)
-    FCFuncElement("IsStreamWriterBufferedDataLostEnabled", MdaManagedSupport::IsStreamWriterBufferedDataLostEnabled)
-    FCFuncElement("IsStreamWriterBufferedDataLostCaptureAllocatedCallStack", MdaManagedSupport::IsStreamWriterBufferedDataLostCaptureAllocatedCallStack)
-    FCFuncElement("ReportStreamWriterBufferedDataLost", MdaManagedSupport::ReportStreamWriterBufferedDataLost)
-    FCFuncElement("IsInvalidGCHandleCookieProbeEnabled", MdaManagedSupport::IsInvalidGCHandleCookieProbeEnabled)
-    FCFuncElement("FireInvalidGCHandleCookieProbe", MdaManagedSupport::FireInvalidGCHandleCookieProbe)
-    FCFuncElement("ReportErrorSafeHandleRelease", MdaManagedSupport::ReportErrorSafeHandleRelease)
-FCFuncEnd()
-#endif // MDA_SUPPORTED
-
 FCFuncStart(gDelegateFuncs)
     FCFuncElement("BindToMethodName", COMDelegate::BindToMethodName)
     FCFuncElement("BindToMethodInfo", COMDelegate::BindToMethodInfo)
diff --git a/src/vm/mdaBoilerplate.exe.mda.config b/src/vm/mdaBoilerplate.exe.mda.config
index 1cbd20037e63..c75d7aa32992 100644
--- a/src/vm/mdaBoilerplate.exe.mda.config
+++ b/src/vm/mdaBoilerplate.exe.mda.config
@@ -192,67 +192,6 @@ ACTIVATION\REPORTING SCENARIOS:
         -->
 	   <dangerousThreadingAPI enable="false" />
 
-	   <!-- 
-            DateTimeInvalidLocalFormat (amoore)                                               
- 
-            ACTIVATION: 
-            Activated by default under a managed debugger.
-            
-            DESCRIPTION: 
-            Indicates when a DateTime instance that represents a UTC time is formatted with a format that should
-            only be used with local instances.
-            
-            BEHAVIORAL IMPACT: 
-            None.
-               
-            SCENARIOS: 
-            
-                SYMPTOM: 
-                An application is manually serializing a UTC DateTime instance using a local format:
-                    
-                    DateTime myDateTime = DateTime.UtcNow;
-                    Serialize(myDateTime.ToString("yyyy-MM-dd'T'HH:mm:ss.fffffffzzz"));
-                            
-                CAUSE: 
-                The 'z' format for DateTime.ToString outputs the local time zone offset, e.g "+10:00" for Sydney time. 
-                As such, it will only output a meaningful result if the value of the DateTime is local. If the value 
-                is UTC, DateTime.ToString will still output the local time zone offset.
-                
-                CORRECTION:
-                UTC DateTime instances should be formatted in a way that indicates that they are UTC. The recommended 
-                format for UTC times to use a 'Z' to denote UTC time:
-                
-                    DateTime myDateTime = DateTime.UtcNow;
-                    Serialize(myDateTime.ToString("yyyy-MM-dd'T'HH:mm:ss.fffffffZ"));
-        
-                There is also a short-hand "o" format that will serialize a DateTime making use of the DateTime.Kind 
-                property that will serialize correctly regardless of whether the instance is Local, Utc or Unspecified:
-                
-                    DateTime myDateTime = DateTime.UtcNow;
-                    Serialize(myDateTime.ToString("o"));
-
-                SYMPTOM: 
-                An application is indirectly serializing a UTC DateTime with a library like XMLConvert or DataSet 
-                serialization :
-                    
-                    DateTime myDateTime = DateTime.UtcNow;
-                    String serialized = XMLConvert.ToString(myDateTime);
-                                                
-                CAUSE: 
-                XmlConvert and DataSet serialization use local formats for serialization by default.
-                Additional options are required to serialize other kinds of DateTime, such as UTC.
-                
-                CORRECTION:
-                For XML Convert, pass in XmlConvertDateTimeOption.RoundTrip.
-                
-                    DateTime myDateTime = DateTime.UtcNow;
-                    String serialized = XmlConvert.ToString(myDateTime, XmlDateTimeSerializationMode.RoundtripKind);
-                    
-                If using DataSet, set the DateTimeMode on the DataColumn object to DataSetDateTime.Utc.                                         
-                             
-            
-        -->
-	   <dateTimeInvalidLocalFormat enable="false" />
 
        <!-- 
             DirtyCastAndCallOnInterface (chriseck)                                               
@@ -522,20 +461,6 @@ ACTIVATION\REPORTING SCENARIOS:
         -->
 	   <invalidFunctionPointerInDelegate enable="false" />
 
-	   <!-- 
-            InvalidGCHandleCookie (chriseck)
-
-            This error event is fired when an invalid IntPtr cookie->GCHandle retrieval is attempted.
-            The cookie is likely invalid because it was not originally created from a GCHandle, 
-            represents a GCHandle that has already been freed, is a cookie to a GCHandle in 
-            a different appdomain, or was marshaled to native code as a GCHandle but passed back into
-            the CLR as an IntPtr where a cast was attempted.
-
-            The symptoms the user will see is undefined behavior (AVs, memory corruption, etc.) while
-            attempting to use or retrieve a GCHandle from a IntPtr.
-        -->
-	   <invalidGCHandleCookie enable="false" />
-
 
 	   <!-- 
             InvalidIUnknown (chriseck)     
@@ -1016,95 +941,6 @@ ACTIVATION\REPORTING SCENARIOS:
 
 
         <!-- 
-            StreamWriterBufferedDataLost (BrianGru)
-            
-            DESCRIPTION:
-            Intended to detect when users write data to a StreamWriter but 
-            don't flush or close the StreamWriter.  That data is then lost,
-            because StreamWriter cannot reliably write data to the underlying
-            Stream from its finalizer.  Users should use a using block when
-            possible to ensure they always close the StreamWriter.
-
-            Poorly written code:
-            void Foo() {
-                StreamWriter sw = new StreamWriter("file.txt");
-                sw.WriteLine("Data");
-                // Forgot to close the StreamWriter.
-            }
-
-            This MDA was implemented by adding a finalizer to StreamWriter
-            that looks for data in its buffer.  As such, it requires your 
-            program to get around to running finalizers before exiting.
-            This should happen in long-running apps automatically over time,
-            but can be forced in short-lived test apps (like the above) by 
-            calling GC.Collect then GC.WaitForPendingFinalizers.
-            
-            BEHAVIORAL IMPACT: 
-            None.
-
-            SCENARIOS:
-                SYMPTOM:
-                User attempts to write to a file, but the last 1K - 4K of data
-                haven't been written to the file.  This MDA detects this
-                data loss during finalization of the StreamWriter.
-
-                CAUSE:
-                User did not properly close their StreamWriter, or arrange for
-                it to be flushed.
-
-                CORRECTION:
-                Use the using statement in C# & VB.  In managed C++, use a 
-                try/finally to call Dispose.  
-
-                void Foo() {
-                    using(StreamWriter sw = new StreamWriter("file.txt")) {
-                        sw.WriteLine("Data");
-                    }
-                }
-
-                Or users can use the long form, expanding out the using clause:
-                
-                void Foo() {
-                    StreamWriter sw;
-                    try {
-                        sw = new StreamWriter("file.txt"));
-                        sw.WriteLine("Data");
-                    }
-                    finally {
-                        if (sw != null)
-                            sw.Close();
-                    }
-                }
-
-                If neither of these solutions can be used (say, if you have a
-                StreamWriter stored in a static variable and thus you cannot 
-                easily run code at the end of its lifetime), then calling Flush
-                on the StreamWriter after its last use or setting its AutoFlush 
-                property to true before its first use will be sufficient.  
-                Here's an example:
-
-                internal static class Foo {
-                    private static StreamWriter _log;
-
-                    static Foo() {  // Static class constructor
-                        StreamWriter sw = new StreamWriter("log.txt");
-                        sw.AutoFlush = true;
-                        // Now publish the StreamWriter for other threads.
-                        _log = sw;
-                    }
-                }
-
-                OUTPUT:
-                An XML message, indicating this violation occurred. To the 
-                effect of "You lost data because you didn't close your 
-                StreamWriter."  It may include a file name and a stack trace 
-                showing where the StreamWriter was allocated, to help track 
-                down incorrect code.
-        -->
-        <streamWriterBufferedDataLost enable="true" captureAllocatedCallStack="false"/>
-
-
-	   <!-- 
             VirtualCERCall (rudim)                       
 
             This is just a warning. It indicates that a callsite within a CER call graph 
diff --git a/src/vm/mdaassistants.cpp b/src/vm/mdaassistants.cpp
index 4b9a7a9d4d52..a416fecdb805 100644
--- a/src/vm/mdaassistants.cpp
+++ b/src/vm/mdaassistants.cpp
@@ -1255,154 +1255,6 @@ void MdaBindingFailure::BindFailed(AssemblySpec *pSpec, OBJECTREF *pExceptionObj
     }
 }
 
-
-//
-// MdaReflection
-//
-FCIMPL0(void, MdaManagedSupport::MemberInfoCacheCreation)
-{
-    FCALL_CONTRACT;
-
-    HELPER_METHOD_FRAME_BEGIN_0();
-    {
-        MdaMemberInfoCacheCreation* pMda = MDA_GET_ASSISTANT(MemberInfoCacheCreation);
-        if (pMda)
-        {
-            pMda->MemberInfoCacheCreation();
-        }
-    }
-    HELPER_METHOD_FRAME_END();
-}
-FCIMPLEND
-
-void MdaMemberInfoCacheCreation::MemberInfoCacheCreation()
-{
-    CONTRACTL
-    {
-        THROWS;
-        GC_TRIGGERS;
-        MODE_ANY;
-    }
-    CONTRACTL_END;
-
-    MdaXmlElement* pXml;
-    MdaXmlMessage msg(this->AsMdaAssistant(), TRUE, &pXml);
-    
-    msg.SendMessage(MDARC_REFLECTION_PERFORMANCE_MEMBERINFOCACHECREATION);
-}
-
-
-FCIMPL0(FC_BOOL_RET, MdaManagedSupport::IsStreamWriterBufferedDataLostEnabled)
-{
-    FCALL_CONTRACT;
-
-    // To see if it's enabled, allocate one then throw it away.
-    MdaStreamWriterBufferedDataLost* pMda = MDA_GET_ASSISTANT(StreamWriterBufferedDataLost);
-        
-    FC_RETURN_BOOL(pMda != NULL);
-}
-FCIMPLEND
-
-FCIMPL0(FC_BOOL_RET, MdaManagedSupport::IsStreamWriterBufferedDataLostCaptureAllocatedCallStack)
-{
-    FCALL_CONTRACT;
-
-    // To see if it's enabled, allocate one then throw it away.
-    MdaStreamWriterBufferedDataLost* pMda = MDA_GET_ASSISTANT(StreamWriterBufferedDataLost);
-        
-    FC_RETURN_BOOL((pMda != NULL) && (pMda->CaptureAllocatedCallStack()));
-}
-FCIMPLEND
-
-FCIMPL1(void, MdaManagedSupport::ReportStreamWriterBufferedDataLost, StringObject * stringRef)
-{
-    FCALL_CONTRACT;
-
-    STRINGREF str(stringRef);
-    MdaStreamWriterBufferedDataLost* pMda = MDA_GET_ASSISTANT(StreamWriterBufferedDataLost);
-    if (pMda)
-    {
-        HELPER_METHOD_FRAME_BEGIN_1(str);
-        StackSString message(str->GetBuffer());
-        pMda->ReportError(message);
-        HELPER_METHOD_FRAME_END();
-    }   
-}
-FCIMPLEND
-
-FCIMPL0(FC_BOOL_RET, MdaManagedSupport::IsInvalidGCHandleCookieProbeEnabled)
-{
-    FCALL_CONTRACT;
-
-    // To see if it's enabled, allocate one then throw it away.
-    MdaInvalidGCHandleCookie* pMda = MDA_GET_ASSISTANT(InvalidGCHandleCookie);
-        
-    FC_RETURN_BOOL(pMda != NULL);
-}
-FCIMPLEND
-
-FCIMPL1(void, MdaManagedSupport::FireInvalidGCHandleCookieProbe, LPVOID cookie)
-{
-    FCALL_CONTRACT;
-
-    MdaInvalidGCHandleCookie* pMda = MDA_GET_ASSISTANT(InvalidGCHandleCookie);
-    if (pMda)
-    {
-        HELPER_METHOD_FRAME_BEGIN_0();
-        pMda->ReportError(cookie);
-        HELPER_METHOD_FRAME_END();
-    }
-}
-FCIMPLEND
-
-FCIMPL1(void, MdaManagedSupport::ReportErrorSafeHandleRelease, ExceptionObject * exceptionRef)
-{
-    FCALL_CONTRACT;
-
-    OBJECTREF exception(exceptionRef);
-    MdaMarshalCleanupError* pMda = MDA_GET_ASSISTANT(MarshalCleanupError);
-    if (pMda)
-    {
-        HELPER_METHOD_FRAME_BEGIN_1(exception);
-        pMda->ReportErrorSafeHandleRelease(&exception);
-        HELPER_METHOD_FRAME_END();
-    }
-}
-FCIMPLEND
-
-void MdaInvalidGCHandleCookie::ReportError(LPVOID cookie)
-{
-    CONTRACTL
-    {
-        THROWS;
-        GC_TRIGGERS;
-        MODE_ANY;
-    }
-    CONTRACTL_END;
-
-    MdaXmlElement* pXml;
-    MdaXmlMessage msg(this->AsMdaAssistant(), TRUE, &pXml);
-
-    msg.SendMessagef(MDARC_INVALID_GCHANDLE_COOKIE, cookie);
-}
-
-void MdaStreamWriterBufferedDataLost::ReportError(SString text)
-{
-    CONTRACTL
-    {
-        THROWS;
-        GC_TRIGGERS;
-        MODE_ANY;
-    }
-    CONTRACTL_END;
-    
-    MdaXmlElement* pXml;
-    MdaXmlMessage msg(this->AsMdaAssistant(), TRUE, &pXml);
-    
-    msg.SendMessage(text);
-}
-
-
 //
 // MdaNotMarshalable
 //
@@ -1453,33 +1305,6 @@ void MdaMarshalCleanupError::ReportErrorThreadCulture(OBJECTREF *pExceptionObj)
     EX_END_CATCH(SwallowAllExceptions);
 }
 
-void MdaMarshalCleanupError::ReportErrorSafeHandleRelease(OBJECTREF *pExceptionObj)
-{
-    CONTRACTL
-    {
-        NOTHROW;
-        GC_TRIGGERS;
-        MODE_ANY;
-    }
-    CONTRACTL_END;
-
-    EX_TRY
-    {
-        MdaXmlElement* pXml;
-        MdaXmlMessage msg(this->AsMdaAssistant(), TRUE, &pXml);
-
-        // retrieve the exception message.
-        SString sszMessage;
-        GetExceptionMessage(*pExceptionObj, sszMessage);
-
-        msg.SendMessagef(MDARC_MARSHALCLEANUPERROR_SAFEHANDLERELEASE, sszMessage.GetUnicode());
-    }
-    EX_CATCH
-    {
-    }
-    EX_END_CATCH(SwallowAllExceptions);
-}
-
 void MdaMarshalCleanupError::ReportErrorSafeHandleProp(OBJECTREF *pExceptionObj)
 {
     CONTRACTL
@@ -2214,39 +2039,5 @@ void MdaInvalidConfigFile::ReportError(MdaElemDeclDef configFile)
     report.SendMessagef(MDARC_INVALID_CONFIG_FILE, szConfigFile);
 }
 
-//
-// MdaDateTimeInvalidLocalFormat
-//
-void MdaDateTimeInvalidLocalFormat::ReportError()
-{
-    CONTRACTL
-    {
-        THROWS;
-        GC_TRIGGERS;
-        MODE_ANY;
-        DEBUG_ONLY;
-    }
-    CONTRACTL_END;
-
-    MdaXmlElement* pXml;
-    MdaXmlMessage msg(this->AsMdaAssistant(), TRUE, &pXml);
-
-    msg.SendMessagef(MDARC_DATETIME_INVALID_LOCAL_FORMAT);
-}
-
-FCIMPL0(void, MdaManagedSupport::DateTimeInvalidLocalFormat)
-{
-    FCALL_CONTRACT;
-
-    MdaDateTimeInvalidLocalFormat* pMda = MDA_GET_ASSISTANT(DateTimeInvalidLocalFormat);
-    if (pMda)
-    {
-        HELPER_METHOD_FRAME_BEGIN_0();
-        pMda->ReportError();
-        HELPER_METHOD_FRAME_END();
-    }
-}
-FCIMPLEND
-
 #endif
 #endif //MDA_SUPPORTED
diff --git a/src/vm/mdaassistants.h b/src/vm/mdaassistants.h
index 1a23f30eb82d..03454cb2bb87 100644
--- a/src/vm/mdaassistants.h
+++ b/src/vm/mdaassistants.h
@@ -47,20 +47,6 @@ See the other report functions for an example (eg, MdaLoaderLock::ReportViolatio
 
 #ifdef MDA_SUPPORTED 
 
-// Until Mda offers first class support for managed code we'll just make targetd ecalls.
-class MdaManagedSupport
-{
-public:
-    static FCDECL0(void, MemberInfoCacheCreation);
-    static FCDECL0(void, DateTimeInvalidLocalFormat);
-    static FCDECL1(void, ReportStreamWriterBufferedDataLost, StringObject * pString);
-    static FCDECL0(FC_BOOL_RET, IsStreamWriterBufferedDataLostEnabled);
-    static FCDECL0(FC_BOOL_RET, IsStreamWriterBufferedDataLostCaptureAllocatedCallStack);
-    static FCDECL0(FC_BOOL_RET, IsInvalidGCHandleCookieProbeEnabled);
-    static FCDECL1(void, FireInvalidGCHandleCookieProbe, LPVOID cookie);
-    static FCDECL1(void, ReportErrorSafeHandleRelease, ExceptionObject * pException);
-};
-
 // MDA classes do not derive from MdaAssistant in the type system, but, rather, use this macro to
 // ensure that their layout is identical to what it would be had they derived from MdaAssistant.  
 // This allows them to be "aggregates", which C++ will allow to be initialized at compile time. 
@@ -144,19 +130,6 @@ class MdaBindingFailure
 };
 
 
-//
-// MdaReflection
-// 
-class MdaMemberInfoCacheCreation
-{
-public:
-    void Initialize(MdaXmlElement* pXmlInput) { WRAPPER_NO_CONTRACT; }
-    void MemberInfoCacheCreation();
-
-    MDA_ASSISTANT_BASE_MEMBERS;
-};
-
-
 //
 // MdaPInvokeLog
 //
@@ -582,9 +555,6 @@ class MdaMarshalCleanupError
 {
 public:
     void Initialize(MdaXmlElement* pXmlInput) { LIMITED_METHOD_CONTRACT; }
-    void ReportErrorThreadCulture(OBJECTREF *pExceptionObj);
-    void ReportErrorSafeHandleRelease(OBJECTREF *pExceptionObj);
-    void ReportErrorSafeHandleProp(OBJECTREF *pExceptionObj);
     void ReportErrorCustomMarshalerCleanup(TypeHandle typeCustomMarshaler, OBJECTREF *pExceptionObj);
 
     MDA_ASSISTANT_BASE_MEMBERS;
@@ -761,19 +731,6 @@ class MdaNonComVisibleBaseClass
 
     MDA_ASSISTANT_BASE_MEMBERS;
 };
-
-
-//
-// InvalidGCHandleCookie
-//
-class MdaInvalidGCHandleCookie
-{
-public:
-    void Initialize(MdaXmlElement* pXmlInput) { LIMITED_METHOD_CONTRACT; }
-    void ReportError(LPVOID cookie);
-
-    MDA_ASSISTANT_BASE_MEMBERS;
-};
     
 //
 // MdaXmlValidator
@@ -818,44 +775,6 @@ class MdaInvalidConfigFile
     MDA_ASSISTANT_BASE_MEMBERS;
 };
 
-//
-// MdaDateTimeInvalidLocalFormat
-//
-class MdaDateTimeInvalidLocalFormat
-{
-public:
-    void Initialize(MdaXmlElement* pXmlInput) { LIMITED_METHOD_CONTRACT; }
-    void ReportError();
-
-    MDA_ASSISTANT_BASE_MEMBERS;
-};
-
-//
-// MdaStreamWriterBufferedDataLost
-//
-class MdaStreamWriterBufferedDataLost
-{
-public:
-    void Initialize(MdaXmlElement* pXmlInput) 
-    { 
-        CONTRACTL
-        {
-            THROWS;
-            GC_NOTRIGGER;
-            MODE_ANY;
-        }
-        CONTRACTL_END;
-        m_captureAllocatedCallStack = pXmlInput->GetAttribute(MdaAttrDecl(CaptureAllocatedCallStack))->GetValueAsBool();
-    }
-    
-    BOOL CaptureAllocatedCallStack() { LIMITED_METHOD_CONTRACT; return m_captureAllocatedCallStack; }
-
-    void ReportError(SString text);
-
-    MDA_ASSISTANT_BASE_MEMBERS;
-    BOOL m_captureAllocatedCallStack;
-};
-
 class ValidateMdaAssistantLayout
 {
     static_assert_no_msg(sizeof(MdaAssistant) == 3);
diff --git a/src/vm/mdaassistantschemas.inl b/src/vm/mdaassistantschemas.inl
index 8eec09f1b4cf..39e0527e23f5 100644
--- a/src/vm/mdaassistantschemas.inl
+++ b/src/vm/mdaassistantschemas.inl
@@ -93,16 +93,7 @@
         // Output
         MDA_DEFINE_OUTPUT(DangerousThreadingAPI)
         MDA_DEFINE_OUTPUT_END(DangerousThreadingAPI)         
-    MDA_DEFINE_ASSISTANT_END(DangerousThreadingAPI)
-    
-    // DateTimeInvalidLocalFormat
-    MDA_DEFINE_ASSISTANT(DateTimeInvalidLocalFormat, NULL)
-        // Input
-        MDA_DEFINE_INPUT_AS_SWITCH(DateTimeInvalidLocalFormat)
-        // Output
-        MDA_DEFINE_OUTPUT(DateTimeInvalidLocalFormat)
-        MDA_DEFINE_OUTPUT_END(DateTimeInvalidLocalFormat)
-    MDA_DEFINE_ASSISTANT_END(DateTimeInvalidLocalFormat)   
+    MDA_DEFINE_ASSISTANT_END(DangerousThreadingAPI)  
 
     // DirtyCastAndCallOnInterface
     MDA_DEFINE_ASSISTANT(DirtyCastAndCallOnInterface, NULL)
@@ -225,15 +216,6 @@
         MDA_DEFINE_OUTPUT_END(InvalidFunctionPointerInDelegate)      
     MDA_DEFINE_ASSISTANT_END(InvalidFunctionPointerInDelegate)
 
-    // InvalidGCHandleCookie
-    MDA_DEFINE_ASSISTANT(InvalidGCHandleCookie, NULL)
-        // Input
-        MDA_DEFINE_INPUT_AS_SWITCH(InvalidGCHandleCookie)
-        // Output
-        MDA_DEFINE_OUTPUT(InvalidGCHandleCookie)
-        MDA_DEFINE_OUTPUT_END(InvalidGCHandleCookie)         
-    MDA_DEFINE_ASSISTANT_END(InvalidGCHandleCookie)
-
     // InvalidIUnknown
     MDA_DEFINE_ASSISTANT(InvalidIUnknown, NULL)
         // Input
@@ -352,15 +334,6 @@
         MDA_DEFINE_OUTPUT_END(Marshaling)
     MDA_DEFINE_ASSISTANT_END(Marshaling)
 
-    // MemberInfoCacheCreation
-    MDA_DEFINE_ASSISTANT(MemberInfoCacheCreation, NULL)   
-        // Input
-        MDA_DEFINE_INPUT_AS_SWITCH(MemberInfoCacheCreation)
-        // Output
-        MDA_DEFINE_OUTPUT(MemberInfoCacheCreation)
-        MDA_DEFINE_OUTPUT_END(MemberInfoCacheCreation)         
-    MDA_DEFINE_ASSISTANT_END(MemberInfoCacheCreation)   
-
     // ModuloObjectHashcode
     MDA_DEFINE_ASSISTANT(ModuloObjectHashcode, W("moh"))
         // Input
@@ -489,17 +462,6 @@
         MDA_DEFINE_OUTPUT(ReportAvOnComRelease)
         MDA_DEFINE_OUTPUT_END(ReportAvOnComRelease)
     MDA_DEFINE_ASSISTANT_END(ReportAvOnComRelease)   
-
-    // StreamWriterBufferedDataLost
-    MDA_DEFINE_ASSISTANT(StreamWriterBufferedDataLost, NULL)
-        // Input
-        MDA_DEFINE_INPUT(StreamWriterBufferedDataLost)
-            MDA_XSD_ATTRIBUTE_DEFAULT(CaptureAllocatedCallStack, BOOL, W("false"))
-        MDA_DEFINE_INPUT_END(StreamWriterBufferedDataLost)
-        //Output
-        MDA_DEFINE_OUTPUT(StreamWriterBufferedDataLost)
-        MDA_DEFINE_OUTPUT_END(StreamWriterBufferedDataLost)        
-    MDA_DEFINE_ASSISTANT_END(StreamWriterBufferedDataLost)
     
     // VirtualCERCall
     MDA_DEFINE_ASSISTANT(VirtualCERCall, NULL)
diff --git a/src/vm/mdagroups.inl b/src/vm/mdagroups.inl
index d02c60c586d4..7f4602ae3d5b 100644
--- a/src/vm/mdagroups.inl
+++ b/src/vm/mdagroups.inl
@@ -22,7 +22,6 @@ MDA_GROUP_DEFINITION(managedDebugger)
     MDA_GROUP_MEMBER(CallbackOnCollectedDelegate)
     MDA_GROUP_MEMBER(ContextSwitchDeadlock)
     MDA_GROUP_MEMBER(DangerousThreadingAPI)
-    MDA_GROUP_MEMBER(DateTimeInvalidLocalFormat)
     MDA_GROUP_MEMBER(DisconnectedContext)
     MDA_GROUP_MEMBER(DllMainReturnsFalse)
     MDA_GROUP_MEMBER(ExceptionSwallowedOnCallFromCom)
@@ -45,7 +44,6 @@ MDA_GROUP_DEFINITION(managedDebugger)
     MDA_GROUP_MEMBER(Reentrancy)
     MDA_GROUP_MEMBER(ReleaseHandleFailed)
     MDA_GROUP_MEMBER(ReportAvOnComRelease)
-    MDA_GROUP_MEMBER(StreamWriterBufferedDataLost)   
 MDA_GROUP_DEFINITION_END(managedDebugger) 
 
 MDA_GROUP_DEFINITION(unmanagedDebugger) 
@@ -56,7 +54,6 @@ MDA_GROUP_DEFINITION_END(unmanagedDebugger)
 MDA_GROUP_DEFINITION(halting) 
     MDA_GROUP_MEMBER(CallbackOnCollectedDelegate)
     MDA_GROUP_MEMBER(ContextSwitchDeadlock)
-    MDA_GROUP_MEMBER(DateTimeInvalidLocalFormat)
     MDA_GROUP_MEMBER(DisconnectedContext)
     MDA_GROUP_MEMBER(FatalExecutionEngineError)    
     MDA_GROUP_MEMBER(InvalidFunctionPointerInDelegate)