Thu, 27 May 2010 18:01:56 -0700
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
Summary: Added new product ObjectAlignmentInBytes flag to control object alignment.
Reviewed-by: twisti, ysr, iveresov
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_jniPeriodicChecker.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | |
duke@435 | 29 | // -------------------------------------------------------- |
duke@435 | 30 | // Class to aid in periodic checking under CheckJNICalls |
duke@435 | 31 | class JniPeriodicCheckerTask : public PeriodicTask { |
duke@435 | 32 | public: |
duke@435 | 33 | JniPeriodicCheckerTask(int interval_time) : PeriodicTask(interval_time) {} |
duke@435 | 34 | void task() { os::run_periodic_checks(); } |
duke@435 | 35 | static void engage(); |
duke@435 | 36 | static void disengage(); |
duke@435 | 37 | }; |
duke@435 | 38 | |
duke@435 | 39 | |
duke@435 | 40 | //---------------------------------------------------------- |
duke@435 | 41 | // Implementation of JniPeriodicChecker |
duke@435 | 42 | |
duke@435 | 43 | JniPeriodicCheckerTask* JniPeriodicChecker::_task = NULL; |
duke@435 | 44 | |
duke@435 | 45 | /* |
duke@435 | 46 | * The engage() method is called at initialization time via |
duke@435 | 47 | * Thread::create_vm() to initialize the JniPeriodicChecker and |
duke@435 | 48 | * register it with the WatcherThread as a periodic task. |
duke@435 | 49 | */ |
duke@435 | 50 | void JniPeriodicChecker::engage() { |
duke@435 | 51 | if (CheckJNICalls && !is_active()) { |
duke@435 | 52 | // start up the periodic task |
duke@435 | 53 | _task = new JniPeriodicCheckerTask(10); |
duke@435 | 54 | _task->enroll(); |
duke@435 | 55 | } |
duke@435 | 56 | } |
duke@435 | 57 | |
duke@435 | 58 | |
duke@435 | 59 | /* |
duke@435 | 60 | * the disengage() method is responsible for deactivating the periodic |
duke@435 | 61 | * task. This method is called from before_exit() in java.cpp and is only called |
duke@435 | 62 | * after the WatcherThread has been stopped. |
duke@435 | 63 | */ |
duke@435 | 64 | void JniPeriodicChecker::disengage() { |
duke@435 | 65 | if (CheckJNICalls && is_active()) { |
duke@435 | 66 | // remove JniPeriodicChecker |
duke@435 | 67 | _task->disenroll(); |
duke@435 | 68 | delete _task; |
duke@435 | 69 | _task = NULL; |
duke@435 | 70 | } |
duke@435 | 71 | } |
duke@435 | 72 | |
duke@435 | 73 | void jniPeriodicChecker_exit() { |
duke@435 | 74 | if (!CheckJNICalls) return; |
duke@435 | 75 | } |