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comparison src/share/vm/runtime/aprofiler.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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 MarkSweep;
37 private:
38 static bool _active; // tells whether profiler is active
39 static GrowableArray<klassOop>* _print_array; // temporary array for printing
40
41 // Utility printing functions
42 static void add_class_to_array(klassOop k);
43 static void add_classes_to_array(klassOop k);
44 static int compare_classes(klassOop* k1, klassOop* k2);
45 static int average(size_t alloc_size, int alloc_count);
46 static void sort_and_print_array(size_t cutoff);
47
48 // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage.
49 static void iterate_since_last_gc();
50
51 public:
52 // Start profiler
53 static void engage();
54 // Stop profiler
55 static void disengage();
56 // Tells whether profiler is active
57 static bool is_active() { return _active; }
58 // Print profile
59 static void print(size_t cutoff); // Cutoff in total allocation size (in words)
60 };