JIT Tracing ETW Events

These events collect information relating to the success or failure of just-in-time (JIT) inlining and JIT tail calls.

JIT Inlining Events

MethodJitInliningFailed Event

The following table shows the keyword and level. (For more information, see CLR ETW Keywords and Levels.)

Keyword for raising the event	Level
JITTracingKeyword (0x10)	Verbose (5)

The following table shows the event information.

Event	Event ID	Raised when
MethodJitInliningFailed	186	The JIT inlining failed.

The following table shows the event data.

Field name	Data type	Description
MethodBeingCompiledNamespace	win:UnicodeString	Namespace of the method that is being compiled.
MethodBeingCompiledName	win:UnicodeString	Name of the method that is being compiled.
MethodBeingCompiledNameSignature	win:UnicodeString	Signature of the method that is being compiled.
InlinerNamespace	win:UnicodeString	The namespace of the method the JIT compiler is trying to generate code for.
InlinerName	win:UnicodeString	The name of the method the compiler is attempting to generate code for. This might not be the same as MethodBeingCompiledName if the compiler is attempting to inline code into MethodBeingCompiledName instead of generating a call to InlinerName.
InlinerNameSignature	win:UnicodeString	The signature for the inliner.
InlineeNamespace	win:UnicodeString	The namespace of the inlinee.
InlineeName	win:UnicodeString	The method the compiler is trying to inline (not generate a call to).
InlineeNameSignature	win:UnicodeString	The signature for the inlinee.
FailAlways	win:Boolean	A hint to the JIT compiler that inlining will always fail for the inlinee.
FailReason	win:UnicodeString	INLINE_NEVER means a previous inlining attempt determined that inlining will never succeed for some other reason; otherwise, free-form text.
ClrInstanceID	win:UnicodeString	Unique ID for the instance of CLR or CoreCLR.

MethodJitInliningSucceeded Event

The following table shows the keyword and level.

Keyword for raising the event	Level
JITTracingKeyword (0x10)	Verbose (5)

The following table shows the event information.

Event	Event ID	Raised when
MethodJitInliningSucceeded	185	The method inlining succeeded.

The following table shows the event data.

Field name	Data type	Description
MethodBeingCompiledNamespace	win:UnicodeString	The namespace of the method that is being compiled.
MethodBeingCompiledName	win:UnicodeString	The name of the method being that is compiled.
MethodBeingCompiledNameSignature	win:UnicodeString	The signature of the method that is being compiled.
InlinerNamespace	win:UnicodeString	The namespace of the method the JIT compiler is attempting to generate code for.
InlinerName	win:UnicodeString	The name of the method the compiler is attempting to generate code for. This might not be the same as MethodBeingCompiledName if the compiler is attempting to inline code into MethodBeingCompiledName instead of generating a call to InlinerName.
InlinerNameSignature	win:UnicodeString	The signature for the inliner.
InlineeNamespace	win:UnicodeString	The namespace of the inlinee.
InlineeName	win:UnicodeString	The method the compiler is trying to inline (not generate a call to).
InlineeNameSignature	win:UnicodeString	The signature for the inlinee.
ClrInstanceID	win:UInt16	Unique ID for the instance of CLR or CoreCLR.

JIT Tail Call Events

MethodJITTailCallFailed Event

The following table shows the keyword and level.

Keyword for raising the event	Level
JITTracingKeyword (0x10)	Verbose (5)

The following table shows the event information.

Event	Event ID	Raised when
MethodJitTailCallFailed	189	The method tail call failed.

The following table shows the event data.

Field name	Data type	Description
MethodBeingCompiledNamespace	win:UnicodeString	Namespace of the method that is being compiled.
MethodBeingCompiledName	win:UnicodeString	Name of the method that is being compiled.
MethodBeingCompiledNameSignature	win:UnicodeString	Signature of the method that is being compiled.
CallerNamespace	win:UnicodeString	The namespace of the method the JIT compiler is attempting to generate code for.
CallerName	win:UnicodeString	The name of the method the compiler is attempting to generate code for.
CallerNameSignature	win:UnicodeString	The signature for the caller.
CalleeNamespace	win:UnicodeString	The namespace of the callee.
CalleeName	win:UnicodeString	The method the compiler is trying to tail call (not generate a call to).
CalleeNameSignature	win:UnicodeString	The signature for the callee.
TailPrefix	win:Boolean	The prefix for the tail call
FailReason	win:UnicodeString	The reason the tail call failed.
ClrInstanceID	win:UInt16	Unique ID for the instance of CLR or CoreCLR.

MethodJITTailCallSucceeded Event

The following table shows the keyword and level.

Keyword for raising the event	Level
JITTracingKeyword (0x10)	Verbose (5)

The following table shows the event information.

Event	Event ID	Raised when
MethodJitTailCallSucceeded	188	The method tail call succeeded.

The following table shows the event data.

Field name	Data type	Description
MethodBeingCompiledNamespace	win:UnicodeString	Namespace of the method that is being compiled.
MethodBeingCompiledName	win:UnicodeString	Name of the method that is being compiled.
MethodBeingCompiledNameSignature	win:UnicodeString	Signature of the method that is being compiled.
CallerNamespace	win:UnicodeString	The namespace of the method the JIT compiler is attempting to generate code for.
CallerName	win:UnicodeString	The name of the method the compiler is attempting to generate code for.
CallerNameSignature	win:UnicodeString	The signature for the caller.
CalleeNamespace	win:UnicodeString	The namespace of the callee.
CalleeName	win:UnicodeString	The method the compiler is trying to tail call (not generate a call to).
CalleeNameSignature	win:UnicodeString	The signature for the callee.
TailPrefix	win:Boolean	The prefix for the tail call.
TailCallType	win:UnicodeString	The type of the tail call.
ClrInstanceID	win:UInt16	Unique ID for the instance of CLR or CoreCLR.

See also

• CLR ETW Events