Integrated: 8350209: Preserve adapters in AOT cache

[Vladimir Kozlov]

On Thu, 17 Apr 2025 19:11:47 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> [JEP 483](https://bugs.openjdk.org/browse/JDK-8315737) preserves class information in AOT cache which helps Java startup performance.
> 
> We should also preserve adapters (i2c, c2i) to further improve performance of class linking where adapters are generated.
> 
> Short running Java application can see several percents improvement. I got 6% improvement when ran `HelloWorld.java` on Linux-x64 Ice Lake CPU (2.5Ghz):
> 
> 
> (perf stat -r 100 java -XX:AOTCache=app.aotcache -cp hello.jar HelloWorld > /dev/null) 2>&1 | grep elapsed
>          0.0299401 +- 0.0000504 seconds time elapsed  ( +-  0.17% )
> 
> (perf stat -r 100 java -XX:AOTCache=app.aotcache -XX:+UnlockDiagnosticVMOptions -XX:-AOTAdapterCaching -cp hello.jar HelloWorld > /dev/null) 2>&1 | grep elapsed
>          0.0318654 +- 0.0000535 seconds time elapsed  ( +-  0.17% )
> 
> 
> New diagnostic flags are introduced (use `-XX:+UnlockDiagnosticVMOptions` to unlock them):
> 
> 
> -XX:+AOTAdapterCaching  - Enable or disable saving and restoring i2c2i adapters
> -XX:AOTCodeMaxSize=10*M - buffer size in bytes for AOT code caching
> -XX:+AbortVMOnAOTCodeFailure - Abort VM on the first occurrence of AOT code caching failure
> 
> By default `AOTAdapterCaching` is `false` and enabled ergonomically when `-XX:AOTCache` is specified.
> This flag is ignored when `AOTCache` is not specified.
> 
> To use AOT adapters follow process described in JEP 483:
> 
> 
> java -XX:AOTMode=record -XX:AOTConfiguration=app.aotconf -cp app.jar App
> java -XX:AOTMode=create -XX:AOTConfiguration=app.aotconf -XX:AOTCache=app.aot -cp app.jar
> java -XX:AOTCache=app.aot -cp app.jar App
> 
> 
> There are several new UL flag combinations to trace the AOT code caching process:
> 
> 
> -Xlog:aot+codecache+init -Xlog:aot+codecache+exit -Xlog:aot+codecache+stubs
> 
> 
> @ashu-mehra is main author of changes. He implemented adapters caching.
> I did main framework (`AOTCodeCache` class) for saving and loading AOT code.
> 
> Tested tier1-6,10, which includes tests with `AOTClassLinking` enabled. Also Xcomp,stress and JCK.

This pull request has now been integrated.

Changeset: aae2bb62
Author:    Vladimir Kozlov <kvn at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/aae2bb62499855e3da33c06547d437e49c91a14b
Stats:     3300 lines in 51 files changed: 2830 ins; 200 del; 270 mod

8350209: Preserve adapters in AOT cache

Co-authored-by: Ashutosh Mehra <asmehra at openjdk.org>
Reviewed-by: vlivanov, asmehra, ihse, iklam

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PR: https://git.openjdk.org/jdk/pull/24740