1 /* 2 * Copyright (c) 2005, 2010, 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_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP 27 28 #include "gc_implementation/parNew/parNewGeneration.hpp" 29 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" 30 31 // A Generation that does parallel young-gen collection extended 32 // for adaptive size policy. 33 34 // Division of generation into spaces 35 // done by DefNewGeneration::compute_space_boundaries() 36 // +---------------+ 37 // | uncommitted | 38 // |---------------| 39 // | ss0 | 40 // |---------------| 41 // | ss1 | 42 // |---------------| 43 // | | 44 // | eden | 45 // | | 46 // +---------------+ <-- low end of VirtualSpace 47 // 48 class ASParNewGeneration: public ParNewGeneration { 49 50 size_t _min_gen_size; 51 52 // Resize the generation based on the desired sizes of 53 // the constituent spaces. 54 bool resize_generation(size_t eden_size, size_t survivor_size); 55 // Resize the spaces based on their desired sizes but 56 // respecting the maximum size of the generation. 57 void resize_spaces(size_t eden_size, size_t survivor_size); 58 // Return the byte size remaining to the minimum generation size. 59 size_t available_to_min_gen(); 60 // Return the byte size remaining to the live data in the generation. 61 size_t available_to_live() const; 62 // Return the byte size that the generation is allowed to shrink. 63 size_t limit_gen_shrink(size_t bytes); 64 // Reset the size of the spaces after a shrink of the generation. 65 void reset_survivors_after_shrink(); 66 67 // Accessor 68 VirtualSpace* virtual_space() { return &_virtual_space; } 69 70 virtual void adjust_desired_tenuring_threshold(); 71 72 public: 73 74 ASParNewGeneration(ReservedSpace rs, 75 size_t initial_byte_size, 76 size_t min_byte_size, 77 int level); 78 79 virtual const char* short_name() const { return "ASParNew"; } 80 virtual const char* name() const; 81 virtual Generation::Name kind() { return ASParNew; } 82 83 // Change the sizes of eden and the survivor spaces in 84 // the generation. The parameters are desired sizes 85 // and are not guaranteed to be met. For example, if 86 // the total is larger than the generation. 87 void resize(size_t eden_size, size_t survivor_size); 88 89 virtual void compute_new_size(); 90 91 size_t max_gen_size() { return _reserved.byte_size(); } 92 size_t min_gen_size() const { return _min_gen_size; } 93 94 // Space boundary invariant checker 95 void space_invariants() PRODUCT_RETURN; 96 }; 97 98 #endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP