diff -r 0bd600d6d77b -r ce9a710b0f63 src/share/vm/classfile/symbolTable.hpp
--- a/src/share/vm/classfile/symbolTable.hpp	Fri May 05 06:07:11 2017 -0700
+++ b/src/share/vm/classfile/symbolTable.hpp	Mon May 15 12:20:15 2017 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -124,8 +124,11 @@
 
   static volatile int _parallel_claimed_idx;
 
-  // Release any dead symbols
-  static void buckets_unlink(int start_idx, int end_idx, int* processed, int* removed, size_t* memory_total);
+  typedef SymbolTable::BucketUnlinkContext BucketUnlinkContext;
+  // Release any dead symbols. Unlinked bucket entries are collected in the given
+  // context to be freed later.
+  // This allows multiple threads to work on the table at once.
+  static void buckets_unlink(int start_idx, int end_idx, BucketUnlinkContext* context, size_t* memory_total);
 public:
   enum {
     symbol_alloc_batch_size = 8,
@@ -274,9 +277,13 @@
   // Apply the give oop closure to the entries to the buckets
   // in the range [start_idx, end_idx).
   static void buckets_oops_do(OopClosure* f, int start_idx, int end_idx);
+
+  typedef StringTable::BucketUnlinkContext BucketUnlinkContext;
   // Unlink or apply the give oop closure to the entries to the buckets
-  // in the range [start_idx, end_idx).
-  static void buckets_unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f, int start_idx, int end_idx, int* processed, int* removed);
+  // in the range [start_idx, end_idx). Unlinked bucket entries are collected in the given
+  // context to be freed later.
+  // This allows multiple threads to work on the table at once.
+  static void buckets_unlink_or_oops_do(BoolObjectClosure* is_alive, OopClosure* f, int start_idx, int end_idx, BucketUnlinkContext* context);
 
   StringTable() : RehashableHashtable<oop, mtSymbol>((int)StringTableSize,
                               sizeof (HashtableEntry<oop, mtSymbol>)) {}