Mercurial > hg > graal-jvmci-8
view src/share/vm/opto/stringopts.hpp @ 12110:4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.
Reviewed-by: tschatzl, dcubed, brutisso
author | stefank |
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date | Fri, 16 Aug 2013 13:22:32 +0200 |
parents | 8f972594effc |
children |
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/* * Copyright (c) 2009, 2012, 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_OPTO_STRINGOPTS_HPP #define SHARE_VM_OPTO_STRINGOPTS_HPP #include "opto/node.hpp" #include "opto/phaseX.hpp" class StringConcat; class PhaseStringOpts : public Phase { friend class StringConcat; private: PhaseGVN* _gvn; // List of dead nodes to clean up aggressively at the end Unique_Node_List dead_worklist; // Memory slices needed for code gen int char_adr_idx; // Integer.sizeTable - used for int to String conversion ciField* size_table_field; // A set for use by various stages VectorSet _visited; // Collect a list of all SB.toString calls Node_List collect_toString_calls(); // Examine the use of the SB alloc to see if it can be replace with // a single string construction. StringConcat* build_candidate(CallStaticJavaNode* call); // Replace all the SB calls in concat with an optimization String allocation void replace_string_concat(StringConcat* concat); // Load the value of a static field, performing any constant folding. Node* fetch_static_field(GraphKit& kit, ciField* field); // Compute the number of characters required to represent the int value Node* int_stringSize(GraphKit& kit, Node* value); // Copy the characters representing value into char_array starting at start void int_getChars(GraphKit& kit, Node* value, Node* char_array, Node* start, Node* end); // Copy of the contents of the String str into char_array starting at index start. Node* copy_string(GraphKit& kit, Node* str, Node* char_array, Node* start); // Clean up any leftover nodes void record_dead_node(Node* node); void remove_dead_nodes(); PhaseGVN* gvn() { return _gvn; } enum { // max length of constant string copy unrolling in copy_string unroll_string_copy_length = 6 }; public: PhaseStringOpts(PhaseGVN* gvn, Unique_Node_List* worklist); }; #endif // SHARE_VM_OPTO_STRINGOPTS_HPP