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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 11
Affects Version/s: 11
Component/s: hotspot
Labels:
- gc-g1
- gc-pending-review

Subcomponent:
gc
Resolved In Build:
b20
CPU:

ppc

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8206755	12	Michihiro Horie	P4	Resolved	Fixed	team
JDK-8206531	11.0.1	Michihiro Horie	P4	Resolved	Fixed	b01

In the G1ParScanThreadState::copy_to_survivor_space, a copy is performed after a thread succeeds in the CAS. CAS-failed threads are not allowed to dereference the forwardee concurrently. Current code is already written so that CAS-failed threads do not dereference the forwardee. Therefore, full fences before/after the CAS is not necessary.

backported by

JDK-8206531 Unnecessary memory barriers in G1ParScanThreadState::copy_to_survivor_space

Resolved

JDK-8206755 Unnecessary memory barriers in G1ParScanThreadState::copy_to_survivor_space

Resolved

relates to

JDK-8154736 enhancement of cmpxchg and copy_to_survivor for ppc64

Resolved

JDK-8277434 tests fail with "assert(is_forwarded()) failed: only decode when actually forwarded"

Closed

JDK-8205908 Unnecessarily strong memory barriers in ParNewGeneration::copy_to_survivor_space

Closed

Assignee:: Michihiro Horie

Reporter:: Michihiro Horie

Votes:: 0 Vote for this issue

Watchers:: 2 Start watching this issue

Created:: 2018-06-06 22:18

Updated:: 2021-11-28 23:55

Resolved:: 2018-06-25 01:46

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