RFR: 8378076: Improve inlining around oop_oop_iterate

[Ivan Walulya]

On Tue, 17 Feb 2026 12:28:56 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Please review this change to improve inlining around `oop_oop_iterate`. The change improves `Concurrent Mark From Roots` in BigRamTester (BRT) by ~15 - 20%.
>> 
>> Before:
>> 
>> [59.292s][info   ][gc,marking] GC(10) Concurrent Mark From Roots 5366.043ms
>> [165.244s][info   ][gc,marking] GC(19) Concurrent Mark From Roots 5537.965ms
>> [270.502s][info   ][gc,marking] GC(29) Concurrent Mark From Roots 5587.758ms
>> [365.912s][info   ][gc,marking] GC(38) Concurrent Mark From Roots 5471.903ms
>> [492.253s][info   ][gc,marking] GC(48) Concurrent Mark From Roots 5146.705ms
>> 
>> After:
>> 
>> [52.924s][info   ][gc,marking] GC(8) Concurrent Mark From Roots 4419.289ms
>> [156.467s][info   ][gc,marking] GC(17) Concurrent Mark From Roots 4540.361ms
>> [263.955s][info   ][gc,marking] GC(27) Concurrent Mark From Roots 4630.036ms
>> [361.794s][info   ][gc,marking] GC(36) Concurrent Mark From Roots 4780.361ms
>> [483.695s][info   ][gc,marking] GC(46) Concurrent Mark From Roots 4480.253ms
>> 
>> 
>> For the BigArrayScanTest attached to [JDK-8057003](https://bugs.openjdk.org/browse/JDK-8057003):
>> 
>> Before:
>> 
>> [0.033s][info ][gc,marking] GC(1) Concurrent Mark From Roots 2.759ms
>> [6.983s][info ][gc,marking] GC(9) Concurrent Mark From Roots 3474.147ms
>> [15.181s][info ][gc,marking] GC(29) Concurrent Mark From Roots 3405.123ms
>> [22.045s][info ][gc,marking] GC(35) Concurrent Mark From Roots 3261.046ms
>> [28.802s][info ][gc,marking] GC(41) Concurrent Mark From Roots 2714.513ms
>> 
>> 
>> After:
>> 
>> [0.033s][info ][gc,marking] GC(1) Concurrent Mark From Roots 2.699ms
>> [5.738s][info ][gc,marking] GC(9) Concurrent Mark From Roots 2345.396ms
>> [12.808s][info ][gc,marking] GC(27) Concurrent Mark From Roots 3288.624ms
>> [20.477s][info ][gc,marking] GC(34) Concurrent Mark From Roots 2604.406ms
>> [27.397s][info ][gc,marking] GC(40) Concurrent Mark From Roots 2499.408ms
>> 
>> 
>> Mach5 Testing: Tier 1-3
>
> Looks good. Thanks for fixing.

Thanks @stefank and @tschatzl for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/29755#issuecomment-3920688721