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 "memory/allocation.inline.hpp"
  30 #include "runtime/atomic.inline.hpp"
  31 
  32 // Records various memory allocation statistics gathered during evacuation.
  33 class G1EvacStats : public PLABStats {
  34  private:
  35   size_t _region_end_waste; // Number of words wasted due to skipping to the next region.
  36   uint   _regions_filled;   // Number of regions filled completely.
  37   size_t _direct_allocated; // Number of words allocated directly into the regions.
  38 
  39   // Number of words in live objects remaining in regions that ultimately suffered an
  40   // evacuation failure. This is used in the regions when the regions are made old regions.
  41   size_t _failure_used;
  42   // Number of words wasted in regions which failed evacuation. This is the sum of space
  43   // for objects successfully copied out of the regions (now dead space) plus waste at the
  44   // end of regions.
  45   size_t _failure_waste;
  46 
  47   virtual void reset() {
  48     PLABStats::reset();
  49     _region_end_waste = 0;
  50     _regions_filled = 0;
  51     _direct_allocated = 0;
  52     _failure_used = 0;
  53     _failure_waste = 0;
  54   }
  55 
  56  public:
  57   G1EvacStats(size_t desired_plab_sz_, unsigned wt) : PLABStats(desired_plab_sz_, wt),
  58     _region_end_waste(0), _regions_filled(0), _direct_allocated(0),
  59     _failure_used(0), _failure_waste(0) {
  60   }
  61 
  62   virtual void adjust_desired_plab_sz();
  63 
  64   size_t allocated() const { return _allocated; }
  65   size_t wasted() const { return _wasted; }
  66   size_t unused() const { return _unused; }
  67   size_t used() const { return allocated() - (wasted() + unused()); }
  68   size_t undo_wasted() const { return _undo_wasted; }
  69 
  70   uint regions_filled() const { return _regions_filled; }
  71   size_t region_end_waste() const { return _region_end_waste; }
  72   size_t direct_allocated() const { return _direct_allocated; }
  73 
  74   // Amount of space in heapwords used in the failing regions when an evacuation failure happens.
  75   size_t failure_used() const { return _failure_used; }
  76   // Amount of space in heapwords wasted (unused) in the failing regions when an evacuation failure happens.
  77   size_t failure_waste() const { return _failure_waste; }
  78 
  79   void add_direct_allocated(size_t value) {
  80     Atomic::add_ptr(value, &_direct_allocated);
  81   }
  82 
  83   void add_region_end_waste(size_t value) {
  84     Atomic::add_ptr(value, &_region_end_waste);
  85     Atomic::add_ptr(1, &_regions_filled);
  86   }
  87 
  88   void add_failure_used_and_waste(size_t used, size_t waste) {
  89     Atomic::add_ptr(used, &_failure_used);
  90     Atomic::add_ptr(waste, &_failure_waste);
  91   }
  92 };
  93 
  94 #endif // SHARE_VM_gc_G1_G1EVACSTATS_HPP