--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/gc_implementation/parallelScavenge/generationSizer.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2001-2006 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.
+ *
+ */
+
+// There is a nice batch of tested generation sizing code in
+// TwoGenerationCollectorPolicy. Lets reuse it!
+
+class GenerationSizer : public TwoGenerationCollectorPolicy {
+ public:
+  GenerationSizer() {
+    // Partial init only!
+    initialize_flags();
+    initialize_size_info();
+  }
+
+  void initialize_flags() {
+    // Do basic sizing work
+    this->TwoGenerationCollectorPolicy::initialize_flags();
+
+    // If the user hasn't explicitly set the number of worker
+    // threads, set the count.
+    if (ParallelGCThreads == 0) {
+      assert(UseParallelGC, "Setting ParallelGCThreads without UseParallelGC");
+      ParallelGCThreads = os::active_processor_count();
+    }
+
+    // The survivor ratio's are calculated "raw", unlike the
+    // default gc, which adds 2 to the ratio value. We need to
+    // make sure the values are valid before using them.
+    if (MinSurvivorRatio < 3) {
+      MinSurvivorRatio = 3;
+    }
+
+    if (InitialSurvivorRatio < 3) {
+      InitialSurvivorRatio = 3;
+    }
+  }
+
+  size_t min_young_gen_size() { return _min_gen0_size; }
+  size_t young_gen_size()     { return _initial_gen0_size; }
+  size_t max_young_gen_size() { return _max_gen0_size; }
+
+  size_t min_old_gen_size()   { return _min_gen1_size; }
+  size_t old_gen_size()       { return _initial_gen1_size; }
+  size_t max_old_gen_size()   { return _max_gen1_size; }
+
+  size_t perm_gen_size()      { return PermSize; }
+  size_t max_perm_gen_size()  { return MaxPermSize; }
+};