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hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp

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+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc.  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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class CardTableRS;   // fwd decl
+class ConcurrentMarkSweepGeneration;
+
+// A PermGen implemented with a CMS space, collected by a CMS collector.
+class CMSPermGen:  public PermGen {
+  friend class VMStructs;
+
+  HeapWord* mem_allocate_work(size_t size);
+ protected:
+  // The "generation" view.
+  ConcurrentMarkSweepGeneration* _gen;
+
+ public:
+  CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
+             CardTableRS* ct, FreeBlockDictionary::DictionaryChoice);
+
+  HeapWord* mem_allocate(size_t size);
+
+  void compute_new_size();
+
+  Generation* as_gen() const { return _gen; }
+};
+
+// This is the "generation" view of a CMSPermGen.
+class CMSPermGenGen: public ConcurrentMarkSweepGeneration {
+  // Abstractly, this is a subtype that gets access to protected fields.
+  friend class CMSPermGen;
+public:
+  CMSPermGenGen(ReservedSpace rs, size_t initial_byte_size,
+                       int level, CardTableRS* ct):
+    // See comments in the constructor for CompactibleFreeListSpace
+    // regarding not using adaptive free lists for a perm gen.
+    ConcurrentMarkSweepGeneration(rs, initial_byte_size, // MinPermHeapExapnsion
+      level, ct, false /* use adaptive freelists */,
+      (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice)
+  {}
+
+  void initialize_performance_counters();
+
+  const char* name() const {
+    return "concurrent-mark-sweep perm gen";
+  }
+
+  const char* short_name() const {
+    return "CMS Perm";
+  }
+
+  bool must_be_youngest() const { return false; }
+  bool must_be_oldest() const { return false; }
+};