1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. 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_VM_GC_G1_G1REMSETTRACKINGPOLICY_HPP 26 #define SHARE_VM_GC_G1_G1REMSETTRACKINGPOLICY_HPP 27 28 #include "gc/g1/heapRegion.hpp" 29 #include "gc/g1/heapRegionType.hpp" 30 #include "memory/allocation.hpp" 31 32 // The remembered set tracking policy determines for a given region the state of 33 // the remembered set, ie. when it should be tracked, and if/when the remembered 34 // set is complete. 35 class G1RemSetTrackingPolicy : public CHeapObj<mtGC> { 36 public: 37 // Do we need to scan the given region to get all outgoing references for remembered 38 // set rebuild? 39 bool needs_scan_for_rebuild(HeapRegion* r) const; 40 // Update remembered set tracking state at allocation of the region. May be 41 // called at any time. The caller makes sure that the changes to the remembered 42 // set state are visible to other threads. 43 void update_at_allocate(HeapRegion* r); 44 // Update remembered set tracking state for humongous regions before we are going to 45 // rebuild remembered sets. Called at safepoint in the remark pause. 46 bool update_humongous_before_rebuild(HeapRegion* r, bool is_live); 47 // Update remembered set tracking state before we are going to rebuild remembered 48 // sets. Called at safepoint in the remark pause. 49 bool update_before_rebuild(HeapRegion* r, size_t live_bytes); 50 // Update remembered set tracking state after rebuild is complete, i.e. the cleanup 51 // pause. Called at safepoint. 52 void update_after_rebuild(HeapRegion* r); 53 // Update remembered set tracking state when the region is freed. 54 void update_at_free(HeapRegion* r); 55 }; 56 57 #endif /* SHARE_VM_GC_G1_G1REMSETTRACKINGPOLICY_HPP */ 58 59