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Type: Enhancement
Resolution: Fixed
Priority: P3
Fix Version/s: hs25
Affects Version/s: 8
Component/s: hotspot
Labels:

Subcomponent:
gc
Resolved In Build:
b47
CPU:

generic
OS:

generic

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8023851	8	Unassigned	P3	Resolved	Fixed	b105
JDK-8033510	7u80	Unassigned	P3	Resolved	Fixed	b01
JDK-8034529	7u65	Unassigned	P3	Resolved	Fixed	b01
JDK-8025423	7u60	Thomas Schatzl	P3	Closed	Fixed	b05

The current mechanism that maintains the scavenge roots in nmethods list is unsuitable for G1. The list implies that there are two types of collections: young (after which the list should be pruned) and full (during which we would scan the whole code cache). So, currently G1 doesn't prune this list at all, which means that the list can grow pretty big. We must have something more flexible. The best way I see to do that is that we would have Rset for each G1 region that would contains nmethods that point to this region. This would allow us to scan only the nmethods requried and also to parallelize the scanning process.

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code_root_handling.png
182 kB
2013-08-12 00:51
ext_root_scan_avg_max.png
521 kB
2013-08-21 10:58
ext_root_scan.perf.png
110 kB
2013-08-12 00:51
nashornbench.txt.csv
3 kB
2013-08-14 05:44
object_copy_update_rs_scan_rs.detail.png
206 kB
2013-08-12 00:51
object_copy_update_rs_scan_rs.png
390 kB
2013-08-12 00:51

backported by

JDK-8023851 G1: optimize nmethods scanning

Resolved

JDK-8033510 G1: optimize nmethods scanning

Resolved

JDK-8034529 G1: optimize nmethods scanning

Resolved

JDK-8025423 G1: optimize nmethods scanning

Closed

duplicates

JDK-7043382 G1: improve accuracy of is_scavengable()

Closed

relates to

JDK-8023145 G1: G1CollectedHeap::mark_strong_code_roots() needs to handle ParallelGCThreads=0

Closed

JDK-8028736 Crash in G1 after making a method with an embedded oop at the start of the code not-entrant

Closed

JDK-8030815 Code roots are not accounted for in region prediction

Resolved

JDK-8035406 Improve data structure for Code Cache remembered sets

Resolved

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

Resolved

JDK-7145572 CMS: optimize nmethod lists to reduce scanning

Closed

JDK-8025813 G1: Code root marking unbalanced

Closed

JDK-8030157 Serial G1 code root migration phase causes long pauses

Closed

JDK-8027756 assert(!hr->isHumongous()) failed: code root in humongous region?

Closed

JDK-8003420 NPG: make new GC root for pd_set

Resolved

JDK-8004888 G1: PSR large heap case shows steady increase in ART

Closed

(11 relates to)

Assignee:: Thomas Schatzl

Reporter:: Igor Veresov

Votes:: 0 Vote for this issue

Watchers:: 8 Start watching this issue

Created:: 2012-02-14 12:01

Updated:: 2023-09-01 02:17

Resolved:: 2013-08-15 15:48

Imported:: 17/Sep/12 3:51 AM

Indexed:: 19/Jul/12 7:46 PM

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