1 /*

     2  * Copyright (c) 2015, 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_gc_G1_G1EVACSTATS_HPP

    26 #define SHARE_VM_gc_G1_G1EVACSTATS_HPP

    27 

    28 #include "gc/shared/plab.hpp"

    29 #include "runtime/atomic.hpp"

    30 

    31 // Records various memory allocation statistics gathered during evacuation.

    32 class G1EvacStats : public PLABStats {

    33  private:

    34   size_t _region_end_waste; // Number of words wasted due to skipping to the next region.

    35   uint   _regions_filled;   // Number of regions filled completely.

    36   size_t _direct_allocated; // Number of words allocated directly into the regions.

    37 

    38   // Number of words in live objects remaining in regions that ultimately suffered an

    39   // evacuation failure. This is used in the regions when the regions are made old regions.

    40   size_t _failure_used;

    41   // Number of words wasted in regions which failed evacuation. This is the sum of space

    42   // for objects successfully copied out of the regions (now dead space) plus waste at the

    43   // end of regions.

    44   size_t _failure_waste;

    45 

    46   virtual void reset() {

    47     PLABStats::reset();

    48     _region_end_waste = 0;

    49     _regions_filled = 0;

    50     _direct_allocated = 0;

    51     _failure_used = 0;

    52     _failure_waste = 0;

    53   }

    54 

    55  public:

    56   G1EvacStats(size_t desired_plab_sz_, unsigned wt) : PLABStats(desired_plab_sz_, wt),

    57     _region_end_waste(0), _regions_filled(0), _direct_allocated(0),

    58     _failure_used(0), _failure_waste(0) {

    59   }

    60 

    61   virtual void adjust_desired_plab_sz();

    62 

    63   size_t allocated() const { return _allocated; }

    64   size_t wasted() const { return _wasted; }

    65   size_t unused() const { return _unused; }

    66   size_t used() const { return allocated() - (wasted() + unused()); }

    67   size_t undo_wasted() const { return _undo_wasted; }

    68 

    69   uint regions_filled() const { return _regions_filled; }

    70   size_t region_end_waste() const { return _region_end_waste; }

    71   size_t direct_allocated() const { return _direct_allocated; }

    72 

    73   // Amount of space in heapwords used in the failing regions when an evacuation failure happens.

    74   size_t failure_used() const { return _failure_used; }

    75   // Amount of space in heapwords wasted (unused) in the failing regions when an evacuation failure happens.

    76   size_t failure_waste() const { return _failure_waste; }

    77 

    78   void add_direct_allocated(size_t value) {

    79     Atomic::add_ptr(value, &_direct_allocated);

    80   }

    81 

    82   void add_region_end_waste(size_t value) {

    83     Atomic::add_ptr(value, &_region_end_waste);

    84     Atomic::add_ptr(1, &_regions_filled);

    85   }

    86 

    87   void add_failure_used_and_waste(size_t used, size_t waste) {

    88     Atomic::add_ptr(used, &_failure_used);

    89     Atomic::add_ptr(waste, &_failure_waste);

    90   }

    91 };

    92 

    93 #endif // SHARE_VM_gc_G1_G1EVACSTATS_HPP