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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 23
Affects Version/s: 17, 21, 22, 23
Component/s: hotspot
Labels:

Subcomponent:
gc
Resolved In Build:
b15
CPU:

generic
OS:

generic

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8333110	22.0.2	Aleksey Shipilev	P4	Resolved	Fixed	b09
JDK-8333305	21.0.5	Aleksey Shipilev	P4	Resolved	Fixed	b01
JDK-8333368	17.0.13	Martin Doerr	P4	Resolved	Fixed	b01

Currently, in Shenandoah's full-GC, we forward all marked objects (and preserve their headers), even if they don't move. This typically happens for a certain amount of 'sediment' that accumulates at the bottom of the heap. This results in wasted CPU cycles and memory accesses and usage. It can easily be avoided by not forwarding objects that don't move.

backported by

JDK-8333110 Shenandoah: Avoid forwarding when objects don't move in full-GC

Resolved

JDK-8333305 Shenandoah: Avoid forwarding when objects don't move in full-GC

Resolved

JDK-8333368 Shenandoah: Avoid forwarding when objects don't move in full-GC

Resolved

links to

Commit openjdk/jdk17u-dev/235baaae

Commit openjdk/jdk21u-dev/dc8b95fb

Commit openjdk/jdk22u/70bd2c74

Commit openjdk/jdk/80ccc989

Review openjdk/jdk17u-dev/2474

Review openjdk/jdk21u-dev/575

Review openjdk/jdk22u/205

Review openjdk/jdk/18280

(6 links to)

Assignee:: Roman Kennke

Reporter:: Roman Kennke

Votes:: 0 Vote for this issue

Watchers:: 4 Start watching this issue

Created:: 2024-03-13 04:44

Updated:: 2024-05-31 10:07

Resolved:: 2024-03-15 04:11

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