1 /*

     2  * Copyright (c) 1997, 2012, 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 #ifndef SHARE_VM_RUNTIME_APROFILER_HPP

    26 #define SHARE_VM_RUNTIME_APROFILER_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 #include "memory/universe.hpp"

    30 #include "oops/klass.hpp"

    31 #include "utilities/top.hpp"

    32 

    33 // A simple allocation profiler for Java. The profiler collects and prints

    34 // the number and total size of instances allocated per class, including

    35 // array classes.

    36 //

    37 // The profiler is currently global for all threads. It can be changed to a

    38 // per threads profiler by keeping a more elaborate data structure and calling

    39 // iterate_since_last_scavenge at thread switches.

    40 

    41 

    42 class AllocationProfiler: AllStatic {

    43   friend class GenCollectedHeap;

    44   friend class G1CollectedHeap;

    45   friend class MarkSweep;

    46  private:

    47   static bool _active;                          // tells whether profiler is active

    48   static GrowableArray<Klass*>* _print_array; // temporary array for printing

    49 

    50   // Utility printing functions

    51   static void add_class_to_array(Klass* k);

    52   static void add_classes_to_array(Klass* k);

    53   static int  compare_classes(Klass** k1, Klass** k2);

    54   static int  average(size_t alloc_size, int alloc_count);

    55   static void sort_and_print_array(size_t cutoff);

    56 

    57   // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage.

    58   static void iterate_since_last_gc();

    59 

    60  public:

    61   // Start profiler

    62   static void engage();

    63   // Stop profiler

    64   static void disengage();

    65   // Tells whether profiler is active

    66   static bool is_active()                   { return _active; }

    67   // Print profile

    68   static void print(size_t cutoff);   // Cutoff in total allocation size (in words)

    69 };

    70 

    71 #endif // SHARE_VM_RUNTIME_APROFILER_HPP