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Type: Enhancement
Resolution: Fixed
Priority: P3
Fix Version/s: 9
Affects Version/s: 8u40, 9
Component/s: hotspot
Labels:
None

Subcomponent:
gc
Resolved In Build:
b29

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8056396	emb-9	Thomas Schatzl	P3	Resolved	Fixed	b29
JDK-8063406	8u45	Thomas Schatzl	P3	Resolved	Fixed	b01
JDK-8055400	8u40	Thomas Schatzl	P3	Resolved	Fixed	b03
JDK-8070964	emb-8u47	Thomas Schatzl	P3	Resolved	Fixed	team

In some cases the ergonomics is trying to shrink a heap that is fairly empty, but fails due to allocated regions at the top of the heap that G1 chooses not to move for various reasons. To work around this without having to pay extra in performance by moving these regions, we should make it possible to decommit memory within the heap - i.e. make the heap capable of handling holes in the committed heap area.

This will require changes in freelist management, virtual space management, and misc parts of the GC code that assumes that the heap is one contiguous area.

backported by

JDK-8055400 G1: Decommit memory within the heap

Resolved

JDK-8056396 G1: Decommit memory within the heap

Resolved

JDK-8063406 G1: Decommit memory within the heap

Resolved

JDK-8070964 G1: Decommit memory within the heap

Resolved

blocks

JDK-8041506 The test gc/g1/TestHumongousShrinkHeap.java reports that memory is not de-committed

Closed

JDK-8054819 Rename HeapRegionSeq to HeapRegionManager

Resolved

duplicates

JDK-8014716 G1: heap (re-)sizing does not take card table alignment required into account

Closed

is blocked by

JDK-8048084 Need to abort concurrent next bitmap clear when marking is aborted during concurrent next bitmap clearing

Closed

JDK-8048112 G1 Full GC needs to support the case when the very first region is not available

Resolved

JDK-8054818 Refactor HeapRegionSeq to manage heap region and auxiliary data

Resolved

relates to

JDK-8067469 G1 ignores AlwaysPreTouch

Resolved

JDK-8055635 Missing include in g1RegionToSpaceMapper.hpp results in unresolved symbol of fastdebug build without precompiled headers

Resolved

JDK-8133456 HeapRegionManager::shrink_by() iterates suboptimally across regions

Resolved

JDK-8055525 Bigapp weblogic+medrec fails to startup after JDK-8038423

Closed

JDK-8060021 Startup performance regressions after JDK-8038423

Closed

JDK-8048085 Aborting marking just before remark results in useless additional clearing of the next mark bitmap

Resolved

JDK-8073632 Make auxiliary data structures know their own translation factor

Resolved

JDK-8042097 G1: Remove ConcurrentMark::update_g1_committed()

Closed

JDK-8048086 G1BlockOffsetSharedArray::compute_size() uses wrong alignment to calculate the amount of space to be reserved

Closed

JDK-8059758 Footprint regressions with JDK-8038423

Closed

JDK-8041946 CMM Testing: 8u40 an allocated humongous object at the end of the heap should not prevents shrinking the heap

Resolved

JDK-8043766 CMM Testing: 8u40 Decommit auxiliary data structures

Resolved

(1 blocks, 1 duplicates, 3 is blocked by, 12 relates to)

Assignee:: Jesper Wilhelmsson

Reporter:: Jesper Wilhelmsson

Votes:: 0 Vote for this issue

Watchers:: 2 Start watching this issue

Created:: 2014-03-26 10:05

Updated:: 2015-08-12 03:33

Resolved:: 2014-08-19 06:25

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