JDK-8194759 : Support caching class mirror objects
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 11
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • Submitted: 2018-01-08
  • Updated: 2024-03-18
  • Resolved: 2018-03-02
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JDK 11
11 b07Fixed
Related Reports
Blocks :  
JDK-8197954 - Remove unnecessary intermediary APIs from AppCDS implementation
Duplicate :  
JDK-8198473 - Cache field offsets for well known classes defined in javaClasses.hpp
Relates :  
JDK-8042668 - Provide GC support for shared heap ranges in Class Data Sharing
Relates :  
JDK-8194741 - Refactor oops in constant pool from CDS to use the Access API
Relates :  
JDK-8059092 - JEP 250: Store Interned Strings in CDS Archives
Relates :  
JDK-8179302 - Pre-resolve constant pool string entries and cache resolved_reference arrays in CDS archive
Relates :  
JDK-8198473 - Cache field offsets for well known classes defined in javaClasses.hpp
Relates :  
JDK-8214932 - Implement more checks for archiving object subgraphs
Relates :  
JDK-8202035 - Archive the set of ModuleDescriptor and ModuleReference objects for observable system modules with unnamed initial module
Relates :  
JDK-8207263 - Store the Configuration for system modules into CDS archive
Relates :  
JDK-8207381 - Provide internal Java API for archiving object sub-graph reachable from static field
Relates :  
JDK-8224853 - CDS address sanitizer errors
Sub Tasks
JDK-8196194 :  
Test plan for JDK-8194759 Support caching class mirror objects - Resolved
Description
Currently with G1 GC there are two types of archive-able heap regions, the open archive heap region and closed archive heap region. In open archive heap regions, objects within the region can have out-going references to other regions within the java heap. In JDK 10, the constant pool's resolved_references arrays (with resolved string constants) were supported to be cached in the open archive region at CDS dump time and used in subsequent JVM executions without recreating those array objects. The class mirror objects are good candidate for caching at CDS dump time. The mirrors will be stored in the open archive heap regions as the resolved_references arrays.

Support G1 GC, 64-bit (non-Windows). Requires UseCompressedOops and UseCompressedClassPointers.
Comments
URL: http://hg.openjdk.java.net/jdk/jdk/rev/04ed29f9ef33 User: jwilhelm Date: 2018-03-23 18:52:48 +0000
23-03-2018
URL: http://hg.openjdk.java.net/jdk/hs/rev/04ed29f9ef33 User: jiangli Date: 2018-03-02 22:36:17 +0000
02-03-2018