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
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  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  public:
  57   G1EvacStats(const char* description, size_t desired_plab_sz_, unsigned wt);
  58 
  59   ~G1EvacStats();
  60 
  61   virtual size_t adjust_desired_plab_sz_helper();
  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