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

Subcomponent:
gc
Resolved In Build:
b03

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8329618	21.0.4-oracle	Thomas Schatzl	P4	Resolved	Fixed	b03
JDK-8331768	21.0.4	Goetz Lindenmaier	P4	Resolved	Fixed	b02

Currently during class unloading dead nmethods are removed one by one as the nmethods are unloaded.
Since this unregistering is serial, it would be nice to have this operation done in parallel and in bulk to improve pause time performance.

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CCStress Purge NMethod Unregistering breakdown 20231207.png
117 kB
2023-12-07 05:30
CCStress Remark Pause time before after 20231207.png
76 kB
2023-12-07 05:30

backported by

JDK-8329618 Add bulk removal of dead nmethods during class unloading

Resolved

JDK-8331768 Add bulk removal of dead nmethods during class unloading

Resolved

blocks

JDK-8320067 Parallel: Parallelize code root remembered set dead nmethod removal

Open

is blocked by

JDK-8315503 G1: Code root scan causes long GC pauses due to imbalanced iteration

Resolved

JDK-8317809 Insertion of free code blobs into code cache can be very slow during class unloading

Resolved

relates to

JDK-8326092 Pause Remark sometimes has extremely long pause times on class unloading

Closed

links to

Commit openjdk/jdk21u-dev/92b43c57

Commit openjdk/jdk/f5538195

Review openjdk/jdk21u-dev/548

Review openjdk/jdk/16767

(1 relates to, 4 links to)

Assignee:: Thomas Schatzl

Reporter:: Thomas Schatzl

Votes:: 0 Vote for this issue

Watchers:: 6 Start watching this issue

Created:: 2023-09-27 00:26

Updated:: 2024-05-07 01:24

Resolved:: 2023-12-18 00:46

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