1 /*
   2  * Copyright (c) 2015, 2019, 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_implementation/g1/g1CollectedHeap.inline.hpp"
  27 #include "gc_implementation/g1/g1IHOPControl.hpp"
  28 #include "gc_implementation/shared/gcTrace.hpp"
  29 #include "jfr/utilities/jfrLog.hpp"
  30 
  31 G1IHOPControl::G1IHOPControl(double initial_ihop_percent) :
  32   _initial_ihop_percent(initial_ihop_percent),
  33   _target_occupancy(0),
  34   _last_allocated_bytes(0),
  35   _last_allocation_time_s(0.0)
  36 {
  37   assert(_initial_ihop_percent >= 0.0 && _initial_ihop_percent <= 100.0, "Initial IHOP value must be between 0 and 100.");
  38 }
  39 
  40 void G1IHOPControl::update_target_occupancy(size_t new_target_occupancy) {
  41   log_debug(gc, ihop)("Target occupancy update: old: " SIZE_FORMAT "B, new: " SIZE_FORMAT "B",
  42                       _target_occupancy, new_target_occupancy);
  43   _target_occupancy = new_target_occupancy;
  44 }
  45 
  46 void G1IHOPControl::update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size) {
  47   assert(allocation_time_s >= 0.0, "Allocation time must be positive.");
  48 
  49   _last_allocation_time_s = allocation_time_s;
  50   _last_allocated_bytes = allocated_bytes;
  51 }
  52 
  53 // should be defined in globalDefinitions.hpp
  54 template<typename T>
  55 inline double percent_of(T numerator, T denominator) {
  56   return denominator != 0 ? (double)numerator / denominator * 100.0 : 0.0;
  57 }
  58 
  59 void G1IHOPControl::print() {
  60   assert(_target_occupancy > 0, "Target occupancy still not updated yet.");
  61   size_t cur_conc_mark_start_threshold = get_conc_mark_start_threshold();
  62   log_debug(gc, ihop)("Basic information (value update), threshold: " SIZE_FORMAT "B (%1.2f), target occupancy: " SIZE_FORMAT "B, current occupancy: " SIZE_FORMAT "B, "
  63                       "recent allocation size: " SIZE_FORMAT "B, recent allocation duration: %1.2fms, recent old gen allocation rate: %1.2fB/s, recent marking phase length: %1.2fms",
  64                       cur_conc_mark_start_threshold,
  65                       percent_of(cur_conc_mark_start_threshold, _target_occupancy),
  66                       _target_occupancy,
  67                       G1CollectedHeap::heap()->used(),
  68                       _last_allocated_bytes,
  69                       _last_allocation_time_s * 1000.0,
  70                       _last_allocation_time_s > 0.0 ? _last_allocated_bytes / _last_allocation_time_s : 0.0,
  71                       last_marking_length_s() * 1000.0);
  72 }
  73 
  74 void G1IHOPControl::send_trace_event(G1NewTracer* tracer) {
  75   assert(_target_occupancy > 0, "Target occupancy still not updated yet.");
  76   tracer->report_basic_ihop_statistics(get_conc_mark_start_threshold(),
  77                                        _target_occupancy,
  78                                        G1CollectedHeap::heap()->used(),
  79                                        _last_allocated_bytes,
  80                                        _last_allocation_time_s,
  81                                        last_marking_length_s());
  82 }
  83 
  84 G1StaticIHOPControl::G1StaticIHOPControl(double ihop_percent) :
  85   G1IHOPControl(ihop_percent),
  86   _last_marking_length_s(0.0) {
  87 }