author | brutisso |
Fri, 27 Mar 2015 09:28:47 +0100 | |
changeset 29795 | 984c5c379c6a |
parent 28482 | e1a8d03c342f |
child 30158 | bd6094906ef8 |
permissions | -rw-r--r-- |
26160 | 1 |
/* |
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP |
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#include "memory/allocation.hpp" |
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#include "memory/memRegion.hpp" |
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#include "runtime/virtualspace.hpp" |
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#include "utilities/bitMap.hpp" |
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// Virtual space management helper for a virtual space with an OS page allocation |
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// granularity. |
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// (De-)Allocation requests are always OS page aligned by passing a page index |
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// and multiples of pages. |
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// The implementation gives an error when trying to commit or uncommit pages that |
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// have already been committed or uncommitted. |
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class G1PageBasedVirtualSpace VALUE_OBJ_CLASS_SPEC { |
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friend class VMStructs; |
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private: |
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// Reserved area addresses. |
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char* _low_boundary; |
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char* _high_boundary; |
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// The commit/uncommit granularity in bytes. |
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size_t _page_size; |
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// Bitmap used for verification of commit/uncommit operations. |
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BitMap _committed; |
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e1a8d03c342f
8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
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diff
changeset
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// Bitmap used to keep track of which pages are dirty or not for _special |
e1a8d03c342f
8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
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// spaces. This is needed because for those spaces the underlying memory |
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8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
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diff
changeset
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// will only be zero filled the first time it is committed. Calls to commit |
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8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
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// will use this bitmap and return whether or not the memory is zero filled. |
e1a8d03c342f
8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
26160
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changeset
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BitMap _dirty; |
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8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
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// Indicates that the entire space has been committed and pinned in memory, |
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// os::commit_memory() or os::uncommit_memory() have no function. |
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bool _special; |
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// Indicates whether the committed space should be executable. |
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bool _executable; |
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// Returns the index of the page which contains the given address. |
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uintptr_t addr_to_page_index(char* addr) const; |
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// Returns the address of the given page index. |
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char* page_start(uintptr_t index); |
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// Returns the byte size of the given number of pages. |
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size_t byte_size_for_pages(size_t num); |
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// Returns true if the entire area is backed by committed memory. |
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bool is_area_committed(uintptr_t start, size_t size_in_pages) const; |
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// Returns true if the entire area is not backed by committed memory. |
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bool is_area_uncommitted(uintptr_t start, size_t size_in_pages) const; |
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public: |
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// Commit the given area of pages starting at start being size_in_pages large. |
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8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
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// Returns true if the given area is zero filled upon completion. |
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8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
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bool commit(uintptr_t start, size_t size_in_pages); |
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// Uncommit the given area of pages starting at start being size_in_pages large. |
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8062063: Usage of UseHugeTLBFS, UseLargePagesInMetaspace and huge SurvivorAlignmentInBytes cause crashes in CMBitMapClosure::do_bit
sjohanss
parents:
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void uncommit(uintptr_t start, size_t size_in_pages); |
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// Initialization |
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G1PageBasedVirtualSpace(); |
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bool initialize_with_granularity(ReservedSpace rs, size_t page_size); |
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// Destruction |
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~G1PageBasedVirtualSpace(); |
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// Amount of reserved memory. |
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size_t reserved_size() const; |
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// Memory used in this virtual space. |
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size_t committed_size() const; |
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// Memory left to use/expand in this virtual space. |
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size_t uncommitted_size() const; |
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bool contains(const void* p) const; |
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MemRegion reserved() { |
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MemRegion x((HeapWord*)_low_boundary, reserved_size() / HeapWordSize); |
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return x; |
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} |
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void release(); |
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void check_for_contiguity() PRODUCT_RETURN; |
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// Debugging |
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void print_on(outputStream* out) PRODUCT_RETURN; |
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void print(); |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP |