Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/task.cpp @ 3979:4dfb2df418f2
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
author | johnc |
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date | Thu, 22 Sep 2011 10:57:37 -0700 |
parents | f95d63e2154a |
children | f08d439fab8c |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.hpp" | |
27 #include "runtime/init.hpp" | |
28 #include "runtime/task.hpp" | |
29 #include "runtime/timer.hpp" | |
30 #ifdef TARGET_OS_FAMILY_linux | |
31 # include "os_linux.inline.hpp" | |
32 # include "thread_linux.inline.hpp" | |
33 #endif | |
34 #ifdef TARGET_OS_FAMILY_solaris | |
35 # include "os_solaris.inline.hpp" | |
36 # include "thread_solaris.inline.hpp" | |
37 #endif | |
38 #ifdef TARGET_OS_FAMILY_windows | |
39 # include "os_windows.inline.hpp" | |
40 # include "thread_windows.inline.hpp" | |
41 #endif | |
0 | 42 |
43 int PeriodicTask::_num_tasks = 0; | |
44 PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks]; | |
45 #ifndef PRODUCT | |
46 elapsedTimer PeriodicTask::_timer; | |
47 int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval]; | |
48 int PeriodicTask::_ticks; | |
49 | |
50 void PeriodicTask::print_intervals() { | |
51 if (ProfilerCheckIntervals) { | |
52 for (int i = 0; i < PeriodicTask::max_interval; i++) { | |
53 int n = _intervalHistogram[i]; | |
54 if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks); | |
55 } | |
56 } | |
57 } | |
58 #endif | |
59 | |
60 void PeriodicTask::real_time_tick(size_t delay_time) { | |
61 #ifndef PRODUCT | |
62 if (ProfilerCheckIntervals) { | |
63 _ticks++; | |
64 _timer.stop(); | |
65 int ms = (int)(_timer.seconds() * 1000.0); | |
66 _timer.reset(); | |
67 _timer.start(); | |
68 if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1; | |
69 _intervalHistogram[ms]++; | |
70 } | |
71 #endif | |
72 int orig_num_tasks = _num_tasks; | |
73 for(int index = 0; index < _num_tasks; index++) { | |
74 _tasks[index]->execute_if_pending(delay_time); | |
75 if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself | |
76 index--; // re-do current slot as it has changed | |
77 orig_num_tasks = _num_tasks; | |
78 } | |
79 } | |
80 } | |
81 | |
82 | |
83 PeriodicTask::PeriodicTask(size_t interval_time) : | |
84 _counter(0), _interval(interval_time) { | |
85 // Sanity check the interval time | |
86 assert(_interval >= PeriodicTask::min_interval && | |
87 _interval <= PeriodicTask::max_interval && | |
88 _interval % PeriodicTask::interval_gran == 0, | |
89 "improper PeriodicTask interval time"); | |
90 } | |
91 | |
92 PeriodicTask::~PeriodicTask() { | |
93 if (is_enrolled()) | |
94 disenroll(); | |
95 } | |
96 | |
97 bool PeriodicTask::is_enrolled() const { | |
98 for(int index = 0; index < _num_tasks; index++) | |
99 if (_tasks[index] == this) return true; | |
100 return false; | |
101 } | |
102 | |
103 void PeriodicTask::enroll() { | |
104 assert(WatcherThread::watcher_thread() == NULL, "dynamic enrollment of tasks not yet supported"); | |
105 | |
106 if (_num_tasks == PeriodicTask::max_tasks) | |
107 fatal("Overflow in PeriodicTask table"); | |
108 _tasks[_num_tasks++] = this; | |
109 } | |
110 | |
111 void PeriodicTask::disenroll() { | |
112 assert(WatcherThread::watcher_thread() == NULL || | |
113 Thread::current() == WatcherThread::watcher_thread(), | |
114 "dynamic disenrollment currently only handled from WatcherThread from within task() method"); | |
115 | |
116 int index; | |
117 for(index = 0; index < _num_tasks && _tasks[index] != this; index++); | |
118 if (index == _num_tasks) return; | |
119 _num_tasks--; | |
120 for (; index < _num_tasks; index++) { | |
121 _tasks[index] = _tasks[index+1]; | |
122 } | |
123 } |