1/*
2 * Copyright (c) 2011, 2018, 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 "jfr/utilities/jfrTimeConverter.hpp"
27#include "jfr/utilities/jfrTime.hpp"
28#include "runtime/os.hpp"
29
30#include OS_HEADER_INLINE(os)
31
32static double ft_counter_to_nanos_factor = .0;
33static double nanos_to_ft_counter_factor = .0;
34static double os_counter_to_nanos_factor = .0;
35static double nanos_to_os_counter_factor = .0;
36
37const double JfrTimeConverter::NANOS_PER_SEC = 1000000000.0;
38const double JfrTimeConverter::NANOS_PER_MILLISEC = 1000000.0;
39const double JfrTimeConverter::NANOS_PER_MICROSEC = 1000.0;
40
41static bool initialized = false;
42
43void JfrTimeConverter::initialize() {
44 if (!initialized) {
45 nanos_to_os_counter_factor = (double)os::elapsed_frequency() / NANOS_PER_SEC;
46 assert(nanos_to_os_counter_factor != .0, "error in conversion!");
47 os_counter_to_nanos_factor = (double)1.0 / nanos_to_os_counter_factor;
48 assert(os_counter_to_nanos_factor != .0, "error in conversion!");
49 if (JfrTime::is_ft_enabled()) {
50 nanos_to_ft_counter_factor = (double)JfrTime::frequency() / NANOS_PER_SEC;
51 assert(nanos_to_ft_counter_factor != .0, "error in conversion!");
52 ft_counter_to_nanos_factor = (double)1.0 / nanos_to_ft_counter_factor;
53 assert(ft_counter_to_nanos_factor != .0, "error in conversion!");
54 }
55 initialized = true;
56 }
57}
58
59double JfrTimeConverter::counter_to_nano_multiplier(bool is_os_time) {
60 if (!initialized) {
61 initialize();
62 }
63 return JfrTime::is_ft_enabled() && !is_os_time ? ft_counter_to_nanos_factor : os_counter_to_nanos_factor;
64}
65
66double JfrTimeConverter::nano_to_counter_multiplier(bool is_os_time) {
67 if (!initialized) {
68 initialize();
69 }
70 return JfrTime::is_ft_enabled() && !is_os_time ? nanos_to_ft_counter_factor : nanos_to_os_counter_factor;
71}
72
73double JfrTimeConverter::counter_to_nanos_internal(jlong c, bool is_os_time) {
74 return (double)c * counter_to_nano_multiplier(is_os_time);
75}
76
77double JfrTimeConverter::counter_to_millis_internal(jlong c, bool is_os_time) {
78 return (counter_to_nanos_internal(c, is_os_time) / NANOS_PER_MILLISEC);
79}
80
81jlong JfrTimeConverter::counter_to_nanos(jlong c, bool is_os_time) {
82 return (jlong)counter_to_nanos_internal(c, is_os_time);
83}
84
85jlong JfrTimeConverter::counter_to_millis(jlong c, bool is_os_time) {
86 return (jlong)counter_to_millis_internal(c, is_os_time);
87}
88
89jlong JfrTimeConverter::nanos_to_countertime(jlong nanos, bool as_os_time) {
90 return nanos <= 0 ? 0 : (jlong)((double)nanos * nano_to_counter_multiplier(as_os_time));
91}
92