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