RFR: 8314452: Explicitly indicate inlining success/failure in PrintInlining [v6]

[Vladimir Kozlov]

On Fri, 8 Sep 2023 12:27:28 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> This patch proposes to add a `+` or `-` to messages produced by `PrintInlining`, to indicate whether inlining succeeded or failed. This makes it easier to find inlining failures in an inlining trace, without having to rely on the message to figure out whether inlining succeeded or failed. Looking at inlining failures is often useful for diagnosing the results of benchmarks, but it can be hard to find inlining failures in lengthy traces.
>> 
>> A sample of what this looks like:
>> 
>> 
>>                             +@ 0   java.lang.foreign.Arena::ofConfined (10 bytes)   inline (hot)
>>                               +@ 0   java.lang.Thread::currentThread (0 bytes)   (intrinsic)
>>                               +@ 3   jdk.internal.foreign.MemorySessionImpl::createConfined (9 bytes)   inline (hot)
>>                                 +@ 5   jdk.internal.foreign.ConfinedSession::<init> (18 bytes)   inline (hot)
>>                                   +@ 6   jdk.internal.foreign.ConfinedSession$ConfinedResourceList::<init> (5 bytes)   inline (hot)
>>                                     +@ 1   jdk.internal.foreign.MemorySessionImpl$ResourceList::<init> (5 bytes)   inline (hot)
>>                                       +@ 1   java.lang.Object::<init> (1 bytes)   inline (hot)
>>                                   +@ 9   jdk.internal.foreign.MemorySessionImpl::<init> (20 bytes)   inline (hot)
>>                                     +@ 1   java.lang.Object::<init> (1 bytes)   inline (hot)
>>                               +@ 6   jdk.internal.foreign.MemorySessionImpl::asArena (9 bytes)   inline (hot)
>>                                 +@ 5   jdk.internal.foreign.MemorySessionImpl$1::<init> (10 bytes)   inline (hot)
>>                                   +@ 6   java.lang.Object::<init> (1 bytes)   inline (hot)
>>                             -@ 8   java.lang.foreign.SegmentAllocator::allocate (24 bytes)   already compiled into a big method
>> 
>> 
>> Using `grep`/`sls` to find inlining failures:
>> 
>> 
>>> Get-Content inlining_trace.txt | sls '-@'
>>                             -@ 8   java.lang.foreign.SegmentAllocator::allocate (24 bytes)   already compiled into a big method
>>                             -@ 34   java.lang.foreign.SegmentAllocator::allocate (24 bytes)   already compiled into a big method
>>                                         -@ 19   java.lang.invoke.MethodHandle::linkToNative(JJJL)D (0 bytes)   native call
>>                                     -@ 95   java.lang.foreign.Arena::cl...
>
> Jorn Vernee has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - trim excess whitespace
>  - rename variables and inlining_kind_of too

I agree with renaming.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15315#pullrequestreview-1617941393