1 /* 2 * Copyright (c) 2020, Red Hat, Inc. 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 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHEVACOOMHANDLER_INLINE_HPP 26 #define SHARE_GC_SHENANDOAH_SHENANDOAHEVACOOMHANDLER_INLINE_HPP 27 28 #include "gc/shenandoah/shenandoahEvacOOMHandler.hpp" 29 30 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 31 #include "gc/shenandoah/shenandoahThreadLocalData.hpp" 32 #include "runtime/atomic.hpp" 33 34 jint ShenandoahEvacOOMCounter::load_acquire() { 35 return Atomic::load_acquire(&_bits); 36 } 37 38 jint ShenandoahEvacOOMCounter::unmasked_count() { 39 return Atomic::load_acquire(&_bits) & ~OOM_MARKER_MASK; 40 } 41 42 void ShenandoahEvacOOMHandler::enter_evacuation(Thread* thr) { 43 uint8_t level = ShenandoahThreadLocalData::push_evac_oom_scope(thr); 44 if (level == 0) { 45 // Entering top level scope, register this thread. 46 register_thread(thr); 47 } else if (!ShenandoahThreadLocalData::is_oom_during_evac(thr)) { 48 ShenandoahEvacOOMCounter* counter = counter_for_thread(thr); 49 jint threads_in_evac = counter->load_acquire(); 50 // If OOM is in progress, handle it. 51 if ((threads_in_evac & ShenandoahEvacOOMCounter::OOM_MARKER_MASK) != 0) { 52 counter->decrement(); 53 wait_for_no_evac_threads(); 54 } 55 } 56 } 57 58 void ShenandoahEvacOOMHandler::leave_evacuation(Thread* thr) { 59 uint8_t level = ShenandoahThreadLocalData::pop_evac_oom_scope(thr); 60 // Not top level, just return 61 if (level > 1) { 62 return; 63 } 64 65 // Leaving top level scope, unregister this thread. 66 unregister_thread(thr); 67 } 68 69 ShenandoahEvacOOMScope::ShenandoahEvacOOMScope() : 70 _thread(Thread::current()) { 71 ShenandoahHeap::heap()->enter_evacuation(_thread); 72 } 73 74 ShenandoahEvacOOMScope::ShenandoahEvacOOMScope(Thread* t) : 75 _thread(t) { 76 ShenandoahHeap::heap()->enter_evacuation(_thread); 77 } 78 79 ShenandoahEvacOOMScope::~ShenandoahEvacOOMScope() { 80 ShenandoahHeap::heap()->leave_evacuation(_thread); 81 } 82 83 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHEVACOOMHANDLER_INLINE_HPP