1 /*

     2  * Copyright (c) 2015, 2017, 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 

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

    31 class G1EvacStats : public PLABStats {

    32  private:

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

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

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

    36 

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

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

    39   size_t _failure_used;

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

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

    42   // end of regions.

    43   size_t _failure_waste;

    44 

    45   virtual void reset() {

    46     PLABStats::reset();

    47     _region_end_waste = 0;

    48     _regions_filled = 0;

    49     _direct_allocated = 0;

    50     _failure_used = 0;

    51     _failure_waste = 0;

    52   }

    53 

    54   virtual void log_plab_allocation();

    55 

    56   virtual size_t compute_desired_plab_sz();

    57 

    58  public:

    59   G1EvacStats(const char* description, size_t desired_plab_sz_, unsigned wt);

    60 

    61   ~G1EvacStats();

    62 

    63   uint regions_filled() const { return _regions_filled; }

    64   size_t region_end_waste() const { return _region_end_waste; }

    65   size_t direct_allocated() const { return _direct_allocated; }

    66 

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

    68   size_t failure_used() const { return _failure_used; }

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

    70   size_t failure_waste() const { return _failure_waste; }

    71 

    72   inline void add_direct_allocated(size_t value);

    73   inline void add_region_end_waste(size_t value);

    74   inline void add_failure_used_and_waste(size_t used, size_t waste);

    75 };

    76 

    77 #endif // SHARE_VM_GC_G1_G1EVACSTATS_HPP