JDK-8037956 : Merge String Deduplication work with String/Symbol table work
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8u20,9
  • Priority: P4
  • Status: Closed
  • Resolution: Other
  • Submitted: 2014-03-20
  • Updated: 2019-01-24
  • Resolved: 2019-01-24
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Other
tbd_majorResolved
Related Reports
Relates :  
JDK-8040006 - Merge "Other" time parallel phases into a single
Relates :  
JDK-8213229 - Investigate treating StringTable as weak in young collections
Relates :  
JDK-8029075 - String deduplication in G1
Description
After JDK-8029075 the new string dedup unlink phase has been added to the unlink_string_and_symbol_table() method as a separate parallel task.

However this adds an additional unnecessary setup/teardown of the worker threads, taking a few ms on a large machine.

Merge the G1StringSymbolTableUnlinkTask with the G1StringDedupUnlinkOrOopsDoTask so that the latter work is done within the same "task".
Comments
The string and symbol table processing has been merged into the WeakProcessor in JDK-8213229. Further work in merging these phases post-evacuation will eg. be handled by JDK-8040006.
24-01-2019