JDK-6962931 : move interned strings out of the perm gen
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs19,1.4.1
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic,solaris_2.5.1
  • CPU: generic
  • Submitted: 2010-06-22
  • Updated: 2017-05-19
  • Resolved: 2011-04-01
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JDK 7 Other
7Fixed hs21Fixed
Related Reports
Duplicate :  
JDK-4642821 - Keep interned strings out of perm gen
Relates :  
JDK-7199147 - description of interned String in doc. of jmap -permstat needs changes
Relates :  
JDK-6863023 - need non-perm oops in code cache for JSR 292
Relates :  
JDK-7005510 - DynamicProbes01 fails with "assert(DTraceAllocProbes) failed: wrong call"
Relates :  
JDK-6962930 - make the string table size configurable
Relates :  
JDK-7032129 - Native memory usage grow unexpectedly for vm/oom/*InternedString tests
Relates :  
JDK-7108242 - jinfo -permstat shouldn't report interned strings as part of perm
Relates :  
JDK-7028374 - race in fix_oop_relocations for scavengeable nmethods
Description
Interned strings are currently stored in the permanent generation.  A new approach for managing meta-data is being designed and it requires interned strings to live elsewhere in the the heap (young gen and/or old gen).
Comments
EVALUATION Some very intermittent failures were detected when testing these changes which turned out to be due to an existing bug in the non-perm oops code, fixed by 7028374. So if this fix is ever backported, it should be accompanied by the fix for 7028374.
16-04-2011
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/b099aaf51bf8
25-03-2011
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-rt/hotspot/rev/b099aaf51bf8
25-03-2011
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot/hotspot/rev/b099aaf51bf8
25-03-2011
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/b099aaf51bf8
22-03-2011
EVALUATION See description. This is straightforward since the fix for 6863023 removed the restriction that interned strings must reside in the perm gen.
22-06-2010