rev 60542 : [mq]: 8245511-rev.3

   1 /*
   2  * Copyright (c) 2020, Amazon.com, Inc. 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 #include "precompiled.hpp"
  26 #include "gc/g1/g1OldGenAllocationTracker.hpp"
  27 #include "logging/log.hpp"
  28 
  29 G1OldGenAllocationTracker::G1OldGenAllocationTracker() :
  30   _last_period_old_bytes(0),
  31   _last_period_humongous_bytes(0),
  32   _humongous_bytes_after_last_gc(0),
  33   _humongous_bytes_after_penultimate_gc(0),
  34   _allocated_bytes_since_last_gc(0),
  35   _allocated_humongous_bytes_since_last_gc(0) {
  36 }
  37 
  38 void G1OldGenAllocationTracker::reset_after_gc(size_t humongous_bytes_after_gc) {
  39   // Record last
  40   _last_period_old_bytes = _allocated_bytes_since_last_gc;
  41   _last_period_humongous_bytes = _allocated_humongous_bytes_since_last_gc;
  42   _humongous_bytes_after_penultimate_gc = _humongous_bytes_after_last_gc;
  43   _humongous_bytes_after_last_gc = humongous_bytes_after_gc;
  44   // Reset
  45   _allocated_bytes_since_last_gc = 0;
  46   _allocated_humongous_bytes_since_last_gc = 0;
  47   log_debug(gc, alloc, stats)("Old generation allocation in the last mutator period, "
  48                               "old gen allocated: " SIZE_FORMAT "B, humongous allocated: " SIZE_FORMAT "B.",
  49                               _last_period_old_bytes, _last_period_humongous_bytes);
  50 }
  51 
  52 size_t G1OldGenAllocationTracker::last_period_net_survived_old_bytes() const {
  53   // The upper limit of the freed region count is the number of regions allocated
  54   // since the last gc. When more humongous regions survived the current gc than
  55   // survived the previous one, deduct the increment.
  56   size_t freed_humongous_bytes = _last_period_humongous_bytes;
  57 
  58   if (freed_humongous_bytes > 0 && _humongous_bytes_after_penultimate_gc < _humongous_bytes_after_last_gc) {
  59     freed_humongous_bytes -= _humongous_bytes_after_last_gc - _humongous_bytes_after_penultimate_gc;
  60   }
  61   assert(_last_period_old_bytes >= freed_humongous_bytes, "Allocation rate cannot be negative");
  62   return _last_period_old_bytes - freed_humongous_bytes;
  63  }
--- EOF ---