1 /*
   2  * Copyright (c) 2011, 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 "jfr/utilities/jfrTimeConverter.hpp"
  27 #include "jfr/utilities/jfrTraceTime.hpp"
  28 #include "runtime/os.hpp"
  29 
  30 #ifdef TARGET_OS_FAMILY_linux
  31 # include "os_linux.inline.hpp"
  32 # include "os_posix.hpp"
  33 #endif
  34 #ifdef TARGET_OS_FAMILY_solaris
  35 # include "os_solaris.inline.hpp"
  36 # include "os_posix.hpp"
  37 #endif
  38 #ifdef TARGET_OS_FAMILY_windows
  39 # include "os_windows.inline.hpp"
  40 #endif
  41 #ifdef TARGET_OS_FAMILY_aix
  42 # include "os_aix.inline.hpp"
  43 # include "os_posix.hpp"
  44 #endif
  45 #ifdef TARGET_OS_FAMILY_bsd
  46 # include "os_posix.hpp"
  47 # include "os_bsd.inline.hpp"
  48 #endif
  49 
  50 static double ft_counter_to_nanos_factor = .0;
  51 static double nanos_to_ft_counter_factor = .0;
  52 static double os_counter_to_nanos_factor = .0;
  53 static double nanos_to_os_counter_factor = .0;
  54 
  55 const double JfrTimeConverter::NANOS_PER_SEC      = 1000000000.0;
  56 const double JfrTimeConverter::NANOS_PER_MILLISEC = 1000000.0;
  57 const double JfrTimeConverter::NANOS_PER_MICROSEC = 1000.0;
  58 
  59 static bool initialized = false;
  60 
  61 void JfrTimeConverter::initialize() {
  62   if (!initialized) {
  63     nanos_to_os_counter_factor = (double)os::elapsed_frequency() / NANOS_PER_SEC;
  64     assert(nanos_to_os_counter_factor != .0, "error in conversion!");
  65     os_counter_to_nanos_factor = (double)1.0 / nanos_to_os_counter_factor;
  66     assert(os_counter_to_nanos_factor != .0, "error in conversion!");
  67     if (JfrTraceTime::is_ft_enabled()) {
  68       nanos_to_ft_counter_factor = (double)JfrTraceTime::frequency() / NANOS_PER_SEC;
  69       assert(nanos_to_ft_counter_factor != .0, "error in conversion!");
  70       ft_counter_to_nanos_factor = (double)1.0 / nanos_to_ft_counter_factor;
  71       assert(ft_counter_to_nanos_factor != .0, "error in conversion!");
  72     }
  73     initialized = true;
  74   }
  75 }
  76 
  77 double JfrTimeConverter::counter_to_nano_multiplier(bool is_os_time) {
  78   if (!initialized) {
  79     initialize();
  80   }
  81   return JfrTraceTime::is_ft_enabled() && !is_os_time ? ft_counter_to_nanos_factor : os_counter_to_nanos_factor;
  82 }
  83 
  84 double JfrTimeConverter::nano_to_counter_multiplier(bool is_os_time) {
  85   if (!initialized) {
  86     initialize();
  87   }
  88   return JfrTraceTime::is_ft_enabled() && !is_os_time ? nanos_to_ft_counter_factor : nanos_to_os_counter_factor;
  89 }
  90 
  91 double JfrTimeConverter::counter_to_nanos_internal(jlong c, bool is_os_time) {
  92   return (double)c * counter_to_nano_multiplier(is_os_time);
  93 }
  94 
  95 double JfrTimeConverter::counter_to_millis_internal(jlong c, bool is_os_time) {
  96   return (counter_to_nanos_internal(c, is_os_time) / NANOS_PER_MILLISEC);
  97 }
  98 
  99 jlong JfrTimeConverter::counter_to_nanos(jlong c, bool is_os_time) {
 100   return (jlong)counter_to_nanos_internal(c, is_os_time);
 101 }
 102 
 103 jlong JfrTimeConverter::counter_to_millis(jlong c, bool is_os_time) {
 104   return (jlong)counter_to_millis_internal(c, is_os_time);
 105 }
 106 
 107 jlong JfrTimeConverter::nanos_to_countertime(jlong nanos, bool as_os_time) {
 108   return nanos <= 0 ? 0 : (jlong)((double)nanos * nano_to_counter_multiplier(as_os_time));
 109 }