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 #include "gc/g1/g1Predictions.hpp"
30
31 G1IHOPControl::G1IHOPControl(double initial_ihop_percent, size_t target_occupancy) :
32 _ihop_percent(initial_ihop_percent),
33 _target_occupancy(target_occupancy) {
34 assert(_ihop_percent >= 0.0 && _ihop_percent <= 100.0, "Initial IHOP value must be between 0 and 100 but is %.3f", initial_ihop_percent);
35 }
36
37 void G1StaticIHOPControl::print() {
38 ergo_verbose6(ErgoIHOP,
39 "basic information",
40 ergo_format_reason("value update")
41 ergo_format_byte_perc("threshold")
42 ergo_format_byte("target occupancy")
43 ergo_format_byte("current occupancy")
44 ergo_format_double("recent old gen allocation rate")
45 ergo_format_ms("recent marking phase length"),
46 get_conc_mark_start_threshold(),
47 (double) get_conc_mark_start_threshold() / G1CollectedHeap::heap()->capacity() * 100.0,
48 _target_occupancy,
49 G1CollectedHeap::heap()->used(),
50 _last_allocation_time_s > 0.0 ? _last_allocated_bytes / _last_allocation_time_s : 0.0,
51 _last_marking_length_s * 1000.0);
52 }
53
54 #ifndef PRODUCT
55 static void test_update(G1IHOPControl* ctrl, double alloc_time, size_t alloc_amount, size_t young_size, double mark_time) {
56 for (int i = 0; i < 100; i++) {
57 ctrl->update_allocation_info(alloc_time, alloc_amount, young_size);
58 ctrl->update_time_to_mixed(mark_time);
59 }
60 }
61
62 void G1StaticIHOPControl::test() {
63 size_t const initial_ihop = 45;
64
65 G1StaticIHOPControl ctrl(initial_ihop, 100);
66 size_t threshold;
67
68 threshold = ctrl.get_conc_mark_start_threshold();
69 assert(threshold == initial_ihop,
70 "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold);
71
72 ctrl.update_allocation_info(100.0, 100, 100);
73 threshold = ctrl.get_conc_mark_start_threshold();
74 assert(threshold == initial_ihop,
75 "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold);
76
77 ctrl.update_time_to_mixed(1000.0);
78 threshold = ctrl.get_conc_mark_start_threshold();
79 assert(threshold == initial_ihop,
80 "Expected IHOP threshold of " SIZE_FORMAT " but is " SIZE_FORMAT, initial_ihop, threshold);
81
82 // Whatever we pass, the IHOP value must stay the same.
83 test_update(&ctrl, 2, 10, 10, 3);
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 test_update(&ctrl, 12, 10, 10, 3);
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 #endif
94
95 #ifndef PRODUCT
96 void IHOP_test() {
97 G1StaticIHOPControl::test();
98 }
99 #endif