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