Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/jfr/recorder/checkpoint/types/traceid/jfrTraceIdEpoch.cpp@a248d0be1309 (annotated)
src/share/vm/jfr/recorder/checkpoint/types/traceid/jfrTraceIdEpoch.cpp
Mon, 19 Aug 2019 10:11:31 +0200
- author
- neugens
- date
- Mon, 19 Aug 2019 10:11:31 +0200
- changeset 9861
- a248d0be1309
- parent 9858
- b985cbb00e68
- permissions
- -rw-r--r--
8229401: Fix JFR code cache test failures
8223689: Add JFR Thread Sampling Support
8223690: Add JFR BiasedLock Event Support
8223691: Add JFR G1 Region Type Change Event Support
8223692: Add JFR G1 Heap Summary Event Support
Summary: Backport JFR from JDK11, additional fixes
Reviewed-by: neugens, apetushkov
Contributed-by: denghui.ddh@alibaba-inc.com
| apetushkov@9858 | 1 | /* |
| apetushkov@9858 | 2 | * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. |
| apetushkov@9858 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| apetushkov@9858 | 4 | * |
| apetushkov@9858 | 5 | * This code is free software; you can redistribute it and/or modify it |
| apetushkov@9858 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| apetushkov@9858 | 7 | * published by the Free Software Foundation. |
| apetushkov@9858 | 8 | * |
| apetushkov@9858 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| apetushkov@9858 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| apetushkov@9858 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| apetushkov@9858 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| apetushkov@9858 | 13 | * accompanied this code). |
| apetushkov@9858 | 14 | * |
| apetushkov@9858 | 15 | * You should have received a copy of the GNU General Public License version |
| apetushkov@9858 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| apetushkov@9858 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| apetushkov@9858 | 18 | * |
| apetushkov@9858 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| apetushkov@9858 | 20 | * or visit www.oracle.com if you need additional information or have any |
| apetushkov@9858 | 21 | * questions. |
| apetushkov@9858 | 22 | * |
| apetushkov@9858 | 23 | */ |
| apetushkov@9858 | 24 | |
| apetushkov@9858 | 25 | #include "precompiled.hpp" |
| apetushkov@9858 | 26 | #include "jfr/recorder/checkpoint/types/traceid/jfrTraceIdEpoch.hpp" |
| apetushkov@9858 | 27 | #include "runtime/safepoint.hpp" |
| apetushkov@9858 | 28 | #include "runtime/orderAccess.hpp" |
| apetushkov@9858 | 29 | |
| apetushkov@9858 | 30 | // Alternating epochs on each rotation allow for concurrent tagging. |
| apetushkov@9858 | 31 | // The regular epoch shift happens only during a safepoint. |
| apetushkov@9858 | 32 | // The fence is there only for the emergency dump case which happens outside of safepoint. |
| apetushkov@9858 | 33 | bool JfrTraceIdEpoch::_epoch_state = false; |
| apetushkov@9858 | 34 | void JfrTraceIdEpoch::shift_epoch() { |
| apetushkov@9858 | 35 | _epoch_state = !_epoch_state; |
| apetushkov@9858 | 36 | if (!SafepointSynchronize::is_at_safepoint()) { |
| apetushkov@9858 | 37 | OrderAccess::fence(); |
| apetushkov@9858 | 38 | } |
| apetushkov@9858 | 39 | } |
