Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/gcLocker.inline.hpp @ 1088:3fc996d4edd2
6902303: G1: ScavengeALot should cause an incremental, rather than a full, collection
Summary: ScavengeALot now causes an incremental (but possibly partially young, in the G1 sense) collection. Some such collections may be abandoned on account of MMU specs. Band-aided a native leak associated with abandoned pauses, as well as an MMU tracker overflow related to frequent scavenge events in the face of a large MMU denominator interval; the latter is protected by a product flag that defaults to false.
Reviewed-by: tonyp
author | ysr |
---|---|
date | Thu, 19 Nov 2009 13:43:25 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ inline bool GC_locker::is_active() { return _lock_count > 0 || _jni_lock_count > 0; } inline bool GC_locker::check_active_before_gc() { if (is_active()) { set_needs_gc(); } return is_active(); } inline void GC_locker::lock() { // cast away volatile Atomic::inc(&_lock_count); CHECK_UNHANDLED_OOPS_ONLY( if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; }) assert(Universe::heap() == NULL || !Universe::heap()->is_gc_active(), "locking failed"); } inline void GC_locker::unlock() { // cast away volatile Atomic::dec(&_lock_count); CHECK_UNHANDLED_OOPS_ONLY( if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; }) } inline void GC_locker::lock_critical(JavaThread* thread) { if (!thread->in_critical()) { if (!needs_gc()) { jni_lock(); } else { jni_lock_slow(); } } thread->enter_critical(); } inline void GC_locker::unlock_critical(JavaThread* thread) { thread->exit_critical(); if (!thread->in_critical()) { if (!needs_gc()) { jni_unlock(); } else { jni_unlock_slow(); } } }