duke@435: /*
duke@435:  * Copyright 1997-2003 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // A simple allocation profiler for Java. The profiler collects and prints
duke@435: // the number and total size of instances allocated per class, including
duke@435: // array classes.
duke@435: //
duke@435: // The profiler is currently global for all threads. It can be changed to a
duke@435: // per threads profiler by keeping a more elaborate data structure and calling
duke@435: // iterate_since_last_scavenge at thread switches.
duke@435: 
duke@435: 
duke@435: class AllocationProfiler: AllStatic {
duke@435:   friend class GenCollectedHeap;
duke@435:   friend class MarkSweep;
duke@435:  private:
duke@435:   static bool _active;                          // tells whether profiler is active
duke@435:   static GrowableArray<klassOop>* _print_array; // temporary array for printing
duke@435: 
duke@435:   // Utility printing functions
duke@435:   static void add_class_to_array(klassOop k);
duke@435:   static void add_classes_to_array(klassOop k);
duke@435:   static int  compare_classes(klassOop* k1, klassOop* k2);
duke@435:   static int  average(size_t alloc_size, int alloc_count);
duke@435:   static void sort_and_print_array(size_t cutoff);
duke@435: 
duke@435:   // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage.
duke@435:   static void iterate_since_last_gc();
duke@435: 
duke@435:  public:
duke@435:   // Start profiler
duke@435:   static void engage();
duke@435:   // Stop profiler
duke@435:   static void disengage();
duke@435:   // Tells whether profiler is active
duke@435:   static bool is_active()                   { return _active; }
duke@435:   // Print profile
duke@435:   static void print(size_t cutoff);   // Cutoff in total allocation size (in words)
duke@435: };