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 83 size_t threshold = ctrl.get_conc_mark_start_threshold(); 84 assert(threshold == initial_ihop, 85 "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold); 86 87 ctrl.update_allocation_info(100.0, 100, 100); 88 threshold = ctrl.get_conc_mark_start_threshold(); 89 assert(threshold == initial_ihop, 90 "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold); 91 92 ctrl.update_marking_length(1000.0); 93 threshold = ctrl.get_conc_mark_start_threshold(); 94 assert(threshold == initial_ihop, 95 "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold); 96 97 // Whatever we pass, the IHOP value must stay the same. 98 test_update(&ctrl, 2, 10, 10, 3); 99 threshold = ctrl.get_conc_mark_start_threshold(); 100 assert(threshold == initial_ihop, 101 "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold); 102 103 test_update(&ctrl, 12, 10, 10, 3); 104 threshold = ctrl.get_conc_mark_start_threshold(); 105 assert(threshold == initial_ihop, 106 "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold); 107 } 108 109 void IHOP_test() { 110 G1StaticIHOPControl::test(); 111 } 112 #endif