JDK-8258604 : Use 'isb' instruction in SpinPause on linux-aarch64
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Priority: P4
  • Status: Closed
  • Resolution: Duplicate
  • OS: linux
  • CPU: aarch64
  • Submitted: 2020-12-17
  • Updated: 2021-12-15
  • Resolved: 2021-12-15
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JDK 19
19Resolved
Related Reports
Duplicate :  
JDK-8278241 - Implement JVM SpinPause on linux-aarch64
Duplicate :  
JDK-8277137 - Set OnSpinWaitInst/OnSpinWaitInstCount defaults to "isb"/1 for Arm Neoverse N1
Relates :  
JDK-8186670 - Implement _onSpinWait() intrinsic for AArch64
Description
Performance data for Neoverse N1 shows that `isb` can be used to emulate the x86 `pause`. It is more reliable than `yield` or a sequence of `nop`.
Comments
Only issues associated with changesets should be closed/resolved as "Fixed". If this issue is fixed by another issue, then please close it as a dupllicate.
15-12-2021
JDK-8278241 + JDK-8277137 provide the fix.
15-12-2021