RFR: 8357258: x86: Improve receiver type profiling reliability [v3]
Aleksey Shipilev
shade at openjdk.org
Wed Sep 24 13:08:14 UTC 2025
> See the bug for discussion what issues current machinery has.
>
> This PR executes the plan outlined in the bug:
> 1. Common the receiver type profiling code in interpreter and C1
> 2. Rewrite receiver type profiling code to only do atomic receiver slot installations
> 3. Trim `C1OptimizeVirtualCallProfiling` to only claim slots when receiver is installed
>
> This PR does _not_ do atomic counter updates themselves, as it may have much wider performance implications, including regressions. This PR should be at least performance neutral.
>
> Additional testing:
> - [x] Linux x86_64 server fastdebug, `compiler/`
> - [x] Linux x86_64 server fastdebug, `all`
Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:
- Merge branch 'master' into JDK-8357258-x86-c1-optimize-virt-calls
- Merge branch 'master' into JDK-8357258-x86-c1-optimize-virt-calls
- Drop atomic counters
- Initial version
-------------
Changes: https://git.openjdk.org/jdk/pull/25305/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25305&range=02
Stats: 350 lines in 7 files changed: 135 ins; 196 del; 19 mod
Patch: https://git.openjdk.org/jdk/pull/25305.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/25305/head:pull/25305
PR: https://git.openjdk.org/jdk/pull/25305
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