1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/parNew/asParNewGeneration.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,98 @@
1.4 +/*
1.5 + * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP
1.30 +
1.31 +#include "gc_implementation/parNew/parNewGeneration.hpp"
1.32 +#include "gc_implementation/shared/adaptiveSizePolicy.hpp"
1.33 +
1.34 +// A Generation that does parallel young-gen collection extended
1.35 +// for adaptive size policy.
1.36 +
1.37 +// Division of generation into spaces
1.38 +// done by DefNewGeneration::compute_space_boundaries()
1.39 +// +---------------+
1.40 +// | uncommitted |
1.41 +// |---------------|
1.42 +// | ss0 |
1.43 +// |---------------|
1.44 +// | ss1 |
1.45 +// |---------------|
1.46 +// | |
1.47 +// | eden |
1.48 +// | |
1.49 +// +---------------+ <-- low end of VirtualSpace
1.50 +//
1.51 +class ASParNewGeneration: public ParNewGeneration {
1.52 +
1.53 + size_t _min_gen_size;
1.54 +
1.55 + // Resize the generation based on the desired sizes of
1.56 + // the constituent spaces.
1.57 + bool resize_generation(size_t eden_size, size_t survivor_size);
1.58 + // Resize the spaces based on their desired sizes but
1.59 + // respecting the maximum size of the generation.
1.60 + void resize_spaces(size_t eden_size, size_t survivor_size);
1.61 + // Return the byte size remaining to the minimum generation size.
1.62 + size_t available_to_min_gen();
1.63 + // Return the byte size remaining to the live data in the generation.
1.64 + size_t available_to_live() const;
1.65 + // Return the byte size that the generation is allowed to shrink.
1.66 + size_t limit_gen_shrink(size_t bytes);
1.67 + // Reset the size of the spaces after a shrink of the generation.
1.68 + void reset_survivors_after_shrink();
1.69 +
1.70 + // Accessor
1.71 + VirtualSpace* virtual_space() { return &_virtual_space; }
1.72 +
1.73 + virtual void adjust_desired_tenuring_threshold();
1.74 +
1.75 + public:
1.76 +
1.77 + ASParNewGeneration(ReservedSpace rs,
1.78 + size_t initial_byte_size,
1.79 + size_t min_byte_size,
1.80 + int level);
1.81 +
1.82 + virtual const char* short_name() const { return "ASParNew"; }
1.83 + virtual const char* name() const;
1.84 + virtual Generation::Name kind() { return ASParNew; }
1.85 +
1.86 + // Change the sizes of eden and the survivor spaces in
1.87 + // the generation. The parameters are desired sizes
1.88 + // and are not guaranteed to be met. For example, if
1.89 + // the total is larger than the generation.
1.90 + void resize(size_t eden_size, size_t survivor_size);
1.91 +
1.92 + virtual void compute_new_size();
1.93 +
1.94 + size_t max_gen_size() { return _reserved.byte_size(); }
1.95 + size_t min_gen_size() const { return _min_gen_size; }
1.96 +
1.97 + // Space boundary invariant checker
1.98 + void space_invariants() PRODUCT_RETURN;
1.99 +};
1.100 +
1.101 +#endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_ASPARNEWGENERATION_HPP
