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Bug ID: JDK-7143490 G1: Remove HeapRegion::_top_at_conc_mark_count
JDK-7143490 : G1: Remove HeapRegion::_top_at_conc_mark_count

Details
Type:
Enhancement
Submit Date:
2012-02-07
Status:
Resolved
Updated Date:
2013-04-30
Project Name:
JDK
Resolved Date:
2012-05-04
Component:
hotspot
OS:
generic
Sub-Component:
gc
CPU:
generic
Priority:
P4
Resolution:
Fixed
Affected Versions:
8-pool
Fixed Versions:
hs24 (b09)

Related Reports
Backport:
Backport:

Sub Tasks

Description
The combination of the changes for 6494965, 6888336, and 7127706 the field _top_at_conc_count should no longer be needed.

With 6888336 and 7127706, the value of NTAMS (for each region) should not change as a result of performing GCs during the marking cycle.

As a result the value that we currently record in _top_at_conc_count should not change between remark and cleanup. Therefore the field can be removed.

At the same time, the code that adds [_top_at_conc_count, ntams) to the liveness counting (during cleanup) should now be a nop and can also be removed.

                                    

Comments
EVALUATION

http://hg.openjdk.java.net/hsx/hotspot-gc/hotspot/rev/8a2e5a6a19a4
                                     
2012-04-25
EVALUATION

http://hg.openjdk.java.net/hsx/hotspot-rt/hotspot/rev/8a2e5a6a19a4
                                     
2012-05-12
EVALUATION

http://hg.openjdk.java.net/lambda/lambda/hotspot/rev/8a2e5a6a19a4
                                     
2012-06-29



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