Mercurial > hg > truffle
diff src/share/vm/gc_implementation/parNew/asParNewGeneration.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/parNew/asParNewGeneration.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,90 @@ +/* + * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// A Generation that does parallel young-gen collection extended +// for adaptive size policy. + +// Division of generation into spaces +// done by DefNewGeneration::compute_space_boundaries() +// +---------------+ +// | uncommitted | +// |---------------| +// | ss0 | +// |---------------| +// | ss1 | +// |---------------| +// | | +// | eden | +// | | +// +---------------+ <-- low end of VirtualSpace +// +class ASParNewGeneration: public ParNewGeneration { + + size_t _min_gen_size; + + // Resize the generation based on the desired sizes of + // the constituent spaces. + bool resize_generation(size_t eden_size, size_t survivor_size); + // Resize the spaces based on their desired sizes but + // respecting the maximum size of the generation. + void resize_spaces(size_t eden_size, size_t survivor_size); + // Return the byte size remaining to the minimum generation size. + size_t available_to_min_gen(); + // Return the byte size remaining to the live data in the generation. + size_t available_to_live() const; + // Return the byte size that the generation is allowed to shrink. + size_t limit_gen_shrink(size_t bytes); + // Reset the size of the spaces after a shrink of the generation. + void reset_survivors_after_shrink(); + + // Accessor + VirtualSpace* virtual_space() { return &_virtual_space; } + + virtual void adjust_desired_tenuring_threshold(); + + public: + + ASParNewGeneration(ReservedSpace rs, + size_t initial_byte_size, + size_t min_byte_size, + int level); + + virtual const char* short_name() const { return "ASParNew"; } + virtual const char* name() const; + virtual Generation::Name kind() { return ASParNew; } + + // Change the sizes of eden and the survivor spaces in + // the generation. The parameters are desired sizes + // and are not guaranteed to be met. For example, if + // the total is larger than the generation. + void resize(size_t eden_size, size_t survivor_size); + + virtual void compute_new_size(); + + size_t max_gen_size() { return _reserved.byte_size(); } + size_t min_gen_size() const { return _min_gen_size; } + + // Space boundary invariant checker + void space_invariants() PRODUCT_RETURN; +};