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 #include "precompiled.hpp"
  26 #include "gc/g1/g1CollectedHeap.inline.hpp"
  27 #include "gc/g1/g1ErgoVerbose.hpp"
  28 #include "gc/g1/g1IHOPControl.hpp"
  29 
  30 G1IHOPControl::G1IHOPControl(double initial_ihop_percent, size_t target_occupancy) :
  31   _initial_ihop_percent(initial_ihop_percent),
  32   _target_occupancy(target_occupancy),
  33   _last_allocated_bytes(0),
  34   _last_allocation_time_s(0.0)
  35 {
  36   assert(_initial_ihop_percent >= 0.0 && _initial_ihop_percent <= 100.0, "Initial IHOP value must be between 0 and 100 but is %.3f", initial_ihop_percent);
  37 }
  38 
  39 void G1IHOPControl::update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size) {
  40   assert(allocation_time_s >= 0.0, "Allocation time must be positive but is %.3f", allocation_time_s);
  41 
  42   _last_allocation_time_s = allocation_time_s;
  43   _last_allocated_bytes = allocated_bytes;
  44 }
  45 
  46 void G1IHOPControl::print() {
  47   size_t cur_conc_mark_start_threshold = get_conc_mark_start_threshold();
  48   ergo_verbose6(ErgoIHOP,
  49                 "basic information",
  50                 ergo_format_reason("value update")
  51                 ergo_format_byte_perc("threshold")
  52                 ergo_format_byte("target occupancy")
  53                 ergo_format_byte("current occupancy")
  54                 ergo_format_double("recent old gen allocation rate")
  55                 ergo_format_double("recent marking phase length"),
  56                 cur_conc_mark_start_threshold,
  57                 cur_conc_mark_start_threshold * 100.0 / _target_occupancy,
  58                 _target_occupancy,
  59                 G1CollectedHeap::heap()->used(),
  60                 _last_allocation_time_s > 0.0 ? _last_allocated_bytes / _last_allocation_time_s : 0.0,
  61                 last_marking_length_s());
  62 }
  63 
  64 G1StaticIHOPControl::G1StaticIHOPControl(double ihop_percent, size_t target_occupancy) :
  65   G1IHOPControl(ihop_percent, target_occupancy),
  66   _last_marking_length_s(0.0) {
  67   assert(_target_occupancy > 0, "Target occupancy must be larger than zero.");
  68 }
  69 
  70 #ifndef PRODUCT
  71 static void test_update(G1IHOPControl* ctrl, double alloc_time, size_t alloc_amount, size_t young_size, double mark_time) {
  72   for (int i = 0; i < 100; i++) {
  73     ctrl->update_allocation_info(alloc_time, alloc_amount, young_size);
  74     ctrl->update_marking_length(mark_time);
  75   }
  76 }
  77 
  78 void G1StaticIHOPControl::test() {
  79   size_t const initial_ihop = 45;
  80 
  81   G1StaticIHOPControl ctrl(initial_ihop, 100);
  82   size_t threshold;
  83   
  84   threshold = ctrl.get_conc_mark_start_threshold();
  85   assert(threshold == initial_ihop,
  86          "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold);
  87 
  88   ctrl.update_allocation_info(100.0, 100, 100);
  89   threshold = ctrl.get_conc_mark_start_threshold();
  90   assert(threshold == initial_ihop,
  91          "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold);
  92 
  93   ctrl.update_marking_length(1000.0);
  94   threshold = ctrl.get_conc_mark_start_threshold();
  95   assert(threshold == initial_ihop,
  96          "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold);
  97 
  98   // Whatever we pass, the IHOP value must stay the same.
  99   test_update(&ctrl, 2, 10, 10, 3);
 100   threshold = ctrl.get_conc_mark_start_threshold();
 101   assert(threshold == initial_ihop,
 102          "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold);
 103 
 104   test_update(&ctrl, 12, 10, 10, 3);
 105   threshold = ctrl.get_conc_mark_start_threshold();
 106   assert(threshold == initial_ihop,
 107          "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold);
 108 }
 109 #endif
 110 
 111 #ifndef PRODUCT
 112 void IHOP_test() {
 113   G1StaticIHOPControl::test();
 114 }
 115 #endif