Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/generationSpec.hpp @ 3992:d1bdeef3e3e2
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
Summary: There is a race between one thread successfully forwarding and copying the klass mirror for the SoftReference class (including the static master clock) and another thread attempting to use the master clock while attempting to discover a soft reference object. Maintain a shadow copy of the soft reference master clock and use the shadow during reference discovery and reference processing.
Reviewed-by: tonyp, brutisso, ysr
author | johnc |
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date | Wed, 12 Oct 2011 10:25:51 -0700 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
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/* * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_MEMORY_GENERATIONSPEC_HPP #define SHARE_VM_MEMORY_GENERATIONSPEC_HPP #include "memory/generation.hpp" #include "memory/permGen.hpp" // The specification of a generation. This class also encapsulates // some generation-specific behavior. This is done here rather than as a // virtual function of Generation because these methods are needed in // initialization of the Generations. class GenerationSpec : public CHeapObj { friend class VMStructs; private: Generation::Name _name; size_t _init_size; size_t _max_size; public: GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) { _name = name; _init_size = init_size; _max_size = max_size; } Generation* init(ReservedSpace rs, int level, GenRemSet* remset); // Accessors Generation::Name name() const { return _name; } size_t init_size() const { return _init_size; } void set_init_size(size_t size) { _init_size = size; } size_t max_size() const { return _max_size; } void set_max_size(size_t size) { _max_size = size; } // Alignment void align(size_t alignment) { set_init_size(align_size_up(init_size(), alignment)); set_max_size(align_size_up(max_size(), alignment)); } // Return the number of regions contained in the generation which // might need to be independently covered by a remembered set. virtual int n_covered_regions() const { return 1; } }; typedef GenerationSpec* GenerationSpecPtr; // The specification of a permanent generation. This class is very // similar to GenerationSpec in use. Due to PermGen's not being a // true Generation, we cannot combine the spec classes either. class PermanentGenerationSpec : public CHeapObj { friend class VMStructs; private: PermGen::Name _name; size_t _init_size; size_t _max_size; size_t _read_only_size; size_t _read_write_size; size_t _misc_data_size; size_t _misc_code_size; bool _enable_shared_spaces; enum { _n_spaces = 2 }; public: PermanentGenerationSpec(PermGen::Name name, size_t init_size, size_t max_size, size_t read_only_size, size_t read_write_size, size_t misc_data_size, size_t misc_code_size); PermGen* init(ReservedSpace rs, size_t init_size, GenRemSet* remset); void disable_sharing() { _enable_shared_spaces = false; _read_only_size = 0; _read_write_size = 0; _misc_data_size = 0; _misc_code_size = 0; } // Accessors PermGen::Name name() const { return _name; } size_t init_size() const { return _init_size; } void set_init_size(size_t size) { _init_size = size; } // Max size for user DOES NOT include shared spaces. // Max size for space allocation DOES include shared spaces. size_t max_size() const { return _max_size + _read_only_size + _read_write_size; } // Need one covered region for the main space, and one for the shared // spaces (together). int n_covered_regions() const { return 2; } void align(size_t alignment); size_t read_only_size() const { return _read_only_size; } size_t read_write_size() const { return _read_write_size; } size_t misc_data_size() const { return _misc_data_size; } size_t misc_code_size() const { return _misc_code_size; } bool enable_shared_spaces() const { return _enable_shared_spaces; } }; #endif // SHARE_VM_MEMORY_GENERATIONSPEC_HPP