jdk8-mips64-public/hotspot: src/share/vm/memory/generationSpec.hpp@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

     1 /*

     2  * Copyright (c) 2001, 2012, 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  */

    25 #ifndef SHARE_VM_MEMORY_GENERATIONSPEC_HPP

    26 #define SHARE_VM_MEMORY_GENERATIONSPEC_HPP

    28 #include "memory/generation.hpp"

    30 // The specification of a generation.  This class also encapsulates

    31 // some generation-specific behavior.  This is done here rather than as a

    32 // virtual function of Generation because these methods are needed in

    33 // initialization of the Generations.

    34 class GenerationSpec : public CHeapObj<mtGC> {

    35   friend class VMStructs;

    36 private:

    37   Generation::Name _name;

    38   size_t           _init_size;

    39   size_t           _max_size;

    41 public:

    42   GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) {

    43     _name = name;

    44     _init_size = init_size;

    45     _max_size = max_size;

    46   }

    48   Generation* init(ReservedSpace rs, int level, GenRemSet* remset);

    50   // Accessors

    51   Generation::Name name()        const { return _name; }

    52   size_t init_size()             const { return _init_size; }

    53   void set_init_size(size_t size)      { _init_size = size; }

    54   size_t max_size()              const { return _max_size; }

    55   void set_max_size(size_t size)       { _max_size = size; }

    57   // Alignment

    58   void align(size_t alignment) {

    59     set_init_size(align_size_up(init_size(), alignment));

    60     set_max_size(align_size_up(max_size(), alignment));

    61   }

    63   // Return the number of regions contained in the generation which

    64   // might need to be independently covered by a remembered set.

    65   virtual int n_covered_regions() const { return 1; }

    66 };

    68 typedef GenerationSpec* GenerationSpecPtr;

    70 #endif // SHARE_VM_MEMORY_GENERATIONSPEC_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/memory/generationSpec.hpp@4c84d351cca9

src/share/vm/memory/generationSpec.hpp