JDK-8151340 : aarch64: prefetch the destination word for write prior to ldxr/stxr loops
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: linux
- CPU: aarch64
- Submitted: 2016-03-05
- Updated: 2021-02-01
- Resolved: 2016-03-08
The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 9 | Other |
|---|---|
9 b112Fixed  |
openjdk8u292Fixed |
Related Reports
|
Relates :
|
Description
As discussed in LKML: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/355996.html, the cost of changing a cacheline from shared to exclusive state can be significant, especially when this is triggered by an exclusive store, since it may result in having to retry the transaction. So it's better to make use of the aarch64 "prfm" instruction to prefetch cachelines for write prior to ldxr/stxr loops.