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1 /* |
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2 * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 * |
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23 */ |
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24 |
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25 // A simple allocation profiler for Java. The profiler collects and prints |
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26 // the number and total size of instances allocated per class, including |
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27 // array classes. |
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28 // |
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29 // The profiler is currently global for all threads. It can be changed to a |
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30 // per threads profiler by keeping a more elaborate data structure and calling |
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31 // iterate_since_last_scavenge at thread switches. |
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32 |
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33 |
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34 class AllocationProfiler: AllStatic { |
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35 friend class GenCollectedHeap; |
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36 friend class MarkSweep; |
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37 private: |
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38 static bool _active; // tells whether profiler is active |
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39 static GrowableArray<klassOop>* _print_array; // temporary array for printing |
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40 |
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41 // Utility printing functions |
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42 static void add_class_to_array(klassOop k); |
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43 static void add_classes_to_array(klassOop k); |
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44 static int compare_classes(klassOop* k1, klassOop* k2); |
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45 static int average(size_t alloc_size, int alloc_count); |
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46 static void sort_and_print_array(size_t cutoff); |
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47 |
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48 // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage. |
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49 static void iterate_since_last_gc(); |
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50 |
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51 public: |
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52 // Start profiler |
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53 static void engage(); |
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54 // Stop profiler |
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55 static void disengage(); |
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56 // Tells whether profiler is active |
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57 static bool is_active() { return _active; } |
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58 // Print profile |
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59 static void print(size_t cutoff); // Cutoff in total allocation size (in words) |
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60 }; |