1 /* 2 * Copyright (c) 2001, 2015, 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_PARALLEL_PSMARKSWEEP_HPP 26 #define SHARE_VM_GC_PARALLEL_PSMARKSWEEP_HPP 27 28 #include "gc/serial/markSweep.hpp" 29 #include "gc/shared/collectorCounters.hpp" 30 #include "gc/shared/referenceProcessor.hpp" 31 #include "utilities/stack.hpp" 32 33 class PSAdaptiveSizePolicy; 34 class PSYoungGen; 35 class PSOldGen; 36 37 class PSMarkSweep : public MarkSweep { 38 private: 39 static elapsedTimer _accumulated_time; 40 static jlong _time_of_last_gc; // ms 41 static CollectorCounters* _counters; 42 43 static SpanSubjectToDiscoveryClosure _span_discoverer; 44 45 // Closure accessors 46 static OopClosure* mark_and_push_closure() { return &MarkSweep::mark_and_push_closure; } 47 static VoidClosure* follow_stack_closure() { return &MarkSweep::follow_stack_closure; } 48 static CLDClosure* follow_cld_closure() { return &MarkSweep::follow_cld_closure; } 49 static OopClosure* adjust_pointer_closure() { return &MarkSweep::adjust_pointer_closure; } 50 static CLDClosure* adjust_cld_closure() { return &MarkSweep::adjust_cld_closure; } 51 static BoolObjectClosure* is_alive_closure() { return &MarkSweep::is_alive; } 52 53 // Mark live objects 54 static void mark_sweep_phase1(bool clear_all_softrefs); 55 // Calculate new addresses 56 static void mark_sweep_phase2(); 57 // Update pointers 58 static void mark_sweep_phase3(); 59 // Move objects to new positions 60 static void mark_sweep_phase4(); 61 62 // Temporary data structures for traversal and storing/restoring marks 63 static void allocate_stacks(); 64 static void deallocate_stacks(); 65 66 // If objects are left in eden after a collection, try to move the boundary 67 // and absorb them into the old gen. Returns true if eden was emptied. 68 static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, 69 PSYoungGen* young_gen, 70 PSOldGen* old_gen); 71 72 // Reset time since last full gc 73 static void reset_millis_since_last_gc(); 74 75 public: 76 static void invoke(bool clear_all_softrefs); 77 static bool invoke_no_policy(bool clear_all_softrefs); 78 79 static void initialize(); 80 81 // Public accessors 82 static elapsedTimer* accumulated_time() { return &_accumulated_time; } 83 static CollectorCounters* counters() { return _counters; } 84 85 // Time since last full gc (in milliseconds) 86 static jlong millis_since_last_gc(); 87 }; 88 89 #endif // SHARE_VM_GC_PARALLEL_PSMARKSWEEP_HPP