Mon, 08 Dec 2014 18:57:33 +0100
8067655: Clean up G1 remembered set oop iteration
Summary: Pass on the static type G1ParPushHeapRSClosure to allow oop_iterate devirtualization
Reviewed-by: jmasa, kbarrett
tschatzl@7051 | 1 | /* |
tschatzl@7051 | 2 | * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
tschatzl@7051 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
tschatzl@7051 | 4 | * |
tschatzl@7051 | 5 | * This code is free software; you can redistribute it and/or modify it |
tschatzl@7051 | 6 | * under the terms of the GNU General Public License version 2 only, as |
tschatzl@7051 | 7 | * published by the Free Software Foundation. |
tschatzl@7051 | 8 | * |
tschatzl@7051 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
tschatzl@7051 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
tschatzl@7051 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
tschatzl@7051 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
tschatzl@7051 | 13 | * accompanied this code). |
tschatzl@7051 | 14 | * |
tschatzl@7051 | 15 | * You should have received a copy of the GNU General Public License version |
tschatzl@7051 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
tschatzl@7051 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
tschatzl@7051 | 18 | * |
tschatzl@7051 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
tschatzl@7051 | 20 | * or visit www.oracle.com if you need additional information or have any |
tschatzl@7051 | 21 | * questions. |
tschatzl@7051 | 22 | * |
tschatzl@7051 | 23 | */ |
tschatzl@7051 | 24 | |
tschatzl@7051 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP |
tschatzl@7051 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP |
tschatzl@7051 | 27 | |
tschatzl@7051 | 28 | #include "memory/allocation.hpp" |
tschatzl@7051 | 29 | #include "memory/memRegion.hpp" |
tschatzl@7051 | 30 | #include "runtime/virtualspace.hpp" |
tschatzl@7051 | 31 | #include "utilities/bitMap.hpp" |
tschatzl@7051 | 32 | |
tschatzl@7051 | 33 | // Virtual space management helper for a virtual space with an OS page allocation |
tschatzl@7051 | 34 | // granularity. |
tschatzl@7051 | 35 | // (De-)Allocation requests are always OS page aligned by passing a page index |
tschatzl@7051 | 36 | // and multiples of pages. |
tschatzl@7051 | 37 | // The implementation gives an error when trying to commit or uncommit pages that |
tschatzl@7051 | 38 | // have already been committed or uncommitted. |
tschatzl@7051 | 39 | class G1PageBasedVirtualSpace VALUE_OBJ_CLASS_SPEC { |
tschatzl@7051 | 40 | friend class VMStructs; |
tschatzl@7051 | 41 | private: |
tschatzl@7051 | 42 | // Reserved area addresses. |
tschatzl@7051 | 43 | char* _low_boundary; |
tschatzl@7051 | 44 | char* _high_boundary; |
tschatzl@7051 | 45 | |
tschatzl@7051 | 46 | // The commit/uncommit granularity in bytes. |
tschatzl@7051 | 47 | size_t _page_size; |
tschatzl@7051 | 48 | |
tschatzl@7051 | 49 | // Bitmap used for verification of commit/uncommit operations. |
tschatzl@7051 | 50 | BitMap _committed; |
tschatzl@7051 | 51 | |
sjohanss@7509 | 52 | // Bitmap used to keep track of which pages are dirty or not for _special |
sjohanss@7509 | 53 | // spaces. This is needed because for those spaces the underlying memory |
sjohanss@7509 | 54 | // will only be zero filled the first time it is committed. Calls to commit |
sjohanss@7509 | 55 | // will use this bitmap and return whether or not the memory is zero filled. |
sjohanss@7509 | 56 | BitMap _dirty; |
sjohanss@7509 | 57 | |
tschatzl@7051 | 58 | // Indicates that the entire space has been committed and pinned in memory, |
tschatzl@7051 | 59 | // os::commit_memory() or os::uncommit_memory() have no function. |
tschatzl@7051 | 60 | bool _special; |
tschatzl@7051 | 61 | |
tschatzl@7051 | 62 | // Indicates whether the committed space should be executable. |
tschatzl@7051 | 63 | bool _executable; |
tschatzl@7051 | 64 | |
tschatzl@7051 | 65 | // Returns the index of the page which contains the given address. |
tschatzl@7051 | 66 | uintptr_t addr_to_page_index(char* addr) const; |
tschatzl@7051 | 67 | // Returns the address of the given page index. |
tschatzl@7051 | 68 | char* page_start(uintptr_t index); |
tschatzl@7051 | 69 | // Returns the byte size of the given number of pages. |
tschatzl@7051 | 70 | size_t byte_size_for_pages(size_t num); |
tschatzl@7051 | 71 | |
tschatzl@7051 | 72 | // Returns true if the entire area is backed by committed memory. |
tschatzl@7051 | 73 | bool is_area_committed(uintptr_t start, size_t size_in_pages) const; |
tschatzl@7051 | 74 | // Returns true if the entire area is not backed by committed memory. |
tschatzl@7051 | 75 | bool is_area_uncommitted(uintptr_t start, size_t size_in_pages) const; |
tschatzl@7051 | 76 | |
tschatzl@7051 | 77 | public: |
tschatzl@7051 | 78 | |
tschatzl@7051 | 79 | // Commit the given area of pages starting at start being size_in_pages large. |
sjohanss@7509 | 80 | // Returns true if the given area is zero filled upon completion. |
sjohanss@7509 | 81 | bool commit(uintptr_t start, size_t size_in_pages); |
tschatzl@7051 | 82 | |
tschatzl@7051 | 83 | // Uncommit the given area of pages starting at start being size_in_pages large. |
sjohanss@7509 | 84 | void uncommit(uintptr_t start, size_t size_in_pages); |
tschatzl@7051 | 85 | |
tschatzl@7051 | 86 | // Initialization |
tschatzl@7051 | 87 | G1PageBasedVirtualSpace(); |
tschatzl@7051 | 88 | bool initialize_with_granularity(ReservedSpace rs, size_t page_size); |
tschatzl@7051 | 89 | |
tschatzl@7051 | 90 | // Destruction |
tschatzl@7051 | 91 | ~G1PageBasedVirtualSpace(); |
tschatzl@7051 | 92 | |
tschatzl@7051 | 93 | // Amount of reserved memory. |
tschatzl@7051 | 94 | size_t reserved_size() const; |
tschatzl@7051 | 95 | // Memory used in this virtual space. |
tschatzl@7051 | 96 | size_t committed_size() const; |
tschatzl@7051 | 97 | // Memory left to use/expand in this virtual space. |
tschatzl@7051 | 98 | size_t uncommitted_size() const; |
tschatzl@7051 | 99 | |
tschatzl@7051 | 100 | bool contains(const void* p) const; |
tschatzl@7051 | 101 | |
tschatzl@7051 | 102 | MemRegion reserved() { |
tschatzl@7051 | 103 | MemRegion x((HeapWord*)_low_boundary, reserved_size() / HeapWordSize); |
tschatzl@7051 | 104 | return x; |
tschatzl@7051 | 105 | } |
tschatzl@7051 | 106 | |
tschatzl@7051 | 107 | void release(); |
tschatzl@7051 | 108 | |
tschatzl@7051 | 109 | void check_for_contiguity() PRODUCT_RETURN; |
tschatzl@7051 | 110 | |
tschatzl@7051 | 111 | // Debugging |
tschatzl@7051 | 112 | void print_on(outputStream* out) PRODUCT_RETURN; |
tschatzl@7051 | 113 | void print(); |
tschatzl@7051 | 114 | }; |
tschatzl@7051 | 115 | |
tschatzl@7051 | 116 | #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1PAGEBASEDVIRTUALSPACE_HPP |