hg: jdk/sandbox: 8195098: Low latency hashtable for read-mostly scenarios

[chris.hegarty at oracle.com]

Changeset: 8e4fcfb4cfe4
Author:    rehn
Date:      2018-05-17 10:32 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/8e4fcfb4cfe4

8195098: Low latency hashtable for read-mostly scenarios
Summary: This implement a concurrent hashtable using chaining and the GlobalCounter for ABA problems.
Reviewed-by: acorn, coleenp, dcubed, eosterlund, gziemski, mlarsson

+ src/hotspot/share/utilities/concurrentHashTable.hpp
+ src/hotspot/share/utilities/concurrentHashTable.inline.hpp
+ src/hotspot/share/utilities/concurrentHashTableTasks.inline.hpp
+ test/hotspot/gtest/utilities/test_concurrentHashtable.cpp