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hotspot/src/share/vm/runtime/aprofiler.hpp

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+/*
+ * Copyright 1997-2003 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.
+ *
+ */
+
+// A simple allocation profiler for Java. The profiler collects and prints
+// the number and total size of instances allocated per class, including
+// array classes.
+//
+// The profiler is currently global for all threads. It can be changed to a
+// per threads profiler by keeping a more elaborate data structure and calling
+// iterate_since_last_scavenge at thread switches.
+
+
+class AllocationProfiler: AllStatic {
+  friend class GenCollectedHeap;
+  friend class MarkSweep;
+ private:
+  static bool _active;                          // tells whether profiler is active
+  static GrowableArray<klassOop>* _print_array; // temporary array for printing
+
+  // Utility printing functions
+  static void add_class_to_array(klassOop k);
+  static void add_classes_to_array(klassOop k);
+  static int  compare_classes(klassOop* k1, klassOop* k2);
+  static int  average(size_t alloc_size, int alloc_count);
+  static void sort_and_print_array(size_t cutoff);
+
+  // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage.
+  static void iterate_since_last_gc();
+
+ public:
+  // Start profiler
+  static void engage();
+  // Stop profiler
+  static void disengage();
+  // Tells whether profiler is active
+  static bool is_active()                   { return _active; }
+  // Print profile
+  static void print(size_t cutoff);   // Cutoff in total allocation size (in words)
+};