1 /* 2 * Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // A simple allocation profiler for Java. The profiler collects and prints 26 // the number and total size of instances allocated per class, including 27 // array classes. 28 // 29 // The profiler is currently global for all threads. It can be changed to a 30 // per threads profiler by keeping a more elaborate data structure and calling 31 // iterate_since_last_scavenge at thread switches. 32 33 34 class AllocationProfiler: AllStatic { 35 friend class GenCollectedHeap; 36 friend class G1CollectedHeap; 37 friend class MarkSweep; 38 private: 39 static bool _active; // tells whether profiler is active 40 static GrowableArray<klassOop>* _print_array; // temporary array for printing 41 42 // Utility printing functions 43 static void add_class_to_array(klassOop k); 44 static void add_classes_to_array(klassOop k); 45 static int compare_classes(klassOop* k1, klassOop* k2); 46 static int average(size_t alloc_size, int alloc_count); 47 static void sort_and_print_array(size_t cutoff); 48 49 // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage. 50 static void iterate_since_last_gc(); 51 52 public: 53 // Start profiler 54 static void engage(); 55 // Stop profiler 56 static void disengage(); 57 // Tells whether profiler is active 58 static bool is_active() { return _active; } 59 // Print profile 60 static void print(size_t cutoff); // Cutoff in total allocation size (in words) 61 };