Bug ID: JDK-8333763 Obsolete RTM flags and code

Type: CSR
Component: hotspot
Sub-Component: compiler

Priority: P4
Status: Closed
Resolution: Approved
Fix Versions: 24

Submitted: 2024-06-06
Updated: 2024-06-10
Resolved: 2024-06-07

Summary
-------

Obsolete RTM flags and remove corresponding code and tests in HotSpot VM.

Problem
-------

RTM flags were deprecated in JDK 23: JDK-8328986

Solution
--------

Obsolete RTM flags in JDK 24 and expire them in JDK 25.

Specification
-------------

```
-  /* Use Restricted Transactional Memory for lock eliding */                \
-  product(bool, UseRTMLocking, false,                                       \
-          "(Deprecated) Enable RTM lock eliding for inflated locks "        \
-          "in compiled code")                                               \
-                                                                            \
-  product(bool, UseRTMDeopt, false,                                         \
-          "(Deprecated) Perform deopt and recompilation based on "          \
-          "RTM abort ratio")                                                \
-                                                                            \
-  product(int, RTMRetryCount, 5,                                            \
-          "(Deprecated) Number of RTM retries on lock abort or busy")       \
-          range(0, max_jint)                                                \
-                                                                            \
```
Full PR for reference: https://github.com/openjdk/jdk/pull/19589

[~kvn] AFAICS this CSR request was filed before the PR was created. Once it existed then the PR would indicate that it needed to be approved.
10-06-2024
Thank you, Joe.
07-06-2024
Moving this CSR to Approved to get it out of the CSR queue.
07-06-2024
But PRs listed CSR as requirement for integration.
07-06-2024
A seperate CSR request is not needed for the Obsoletion as removal was covered when they were Deprecated.
07-06-2024

CSR :	JDK-8329141 - Obsolete RTM flags and code
Relates :	JDK-8328991 - Deprecate UseRTM* flags for removal