Mercurial > hg > graal-compiler
view src/share/vm/memory/filemap.hpp @ 12979:1d1ea10fe09f
8015255: NPG: Don't waste fragment at the end of a VirtualSpaceNode before retiring it.
Summary: Chunk up the last piece of committed memory in a VSN when getting a new one.
Reviewed-by: stefank, jmasa
author | mgerdin |
---|---|
date | Tue, 15 Oct 2013 13:56:46 +0200 |
parents | 85c1ca43713f |
children | ca6d25be853b 6e0cb14ce59b |
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/* * Copyright (c) 2003, 2013, 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_FILEMAP_HPP #define SHARE_VM_MEMORY_FILEMAP_HPP #include "memory/metaspaceShared.hpp" #include "memory/metaspace.hpp" // Layout of the file: // header: dump of archive instance plus versioning info, datestamp, etc. // [magic # = 0xF00BABA2] // ... padding to align on page-boundary // read-write space from CompactingPermGenGen // read-only space from CompactingPermGenGen // misc data (block offset table, string table, symbols, dictionary, etc.) // tag(666) static const int JVM_SHARED_JARS_MAX = 128; static const int JVM_SPACENAME_MAX = 128; static const int JVM_IDENT_MAX = 256; static const int JVM_ARCH_MAX = 12; class Metaspace; class FileMapInfo : public CHeapObj<mtInternal> { private: enum { _invalid_version = -1, _current_version = 1 }; bool _file_open; int _fd; long _file_offset; // FileMapHeader describes the shared space data in the file to be // mapped. This structure gets written to a file. It is not a class, so // that the compilers don't add any compiler-private data to it. struct FileMapHeader { int _magic; // identify file type. int _version; // (from enum, above.) size_t _alignment; // how shared archive should be aligned int _obj_alignment; // value of ObjectAlignmentInBytes struct space_info { int _file_offset; // sizeof(this) rounded to vm page size char* _base; // copy-on-write base address size_t _capacity; // for validity checking size_t _used; // for setting space top on read bool _read_only; // read only space? bool _allow_exec; // executable code in space? } _space[MetaspaceShared::n_regions]; // The following fields are all sanity checks for whether this archive // will function correctly with this JVM and the bootclasspath it's // invoked with. char _arch[JVM_ARCH_MAX]; // architecture char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm int _num_jars; // Number of jars in bootclasspath // Per jar file data: timestamp, size. struct { time_t _timestamp; // jar timestamp. long _filesize; // jar file size. } _jar[JVM_SHARED_JARS_MAX]; } _header; const char* _full_path; static FileMapInfo* _current_info; bool init_from_file(int fd); void align_file_position(); public: FileMapInfo() { _file_offset = 0; _file_open = false; _header._version = _invalid_version; } static int current_version() { return _current_version; } void populate_header(size_t alignment); bool validate(); void invalidate(); int version() { return _header._version; } size_t alignment() { return _header._alignment; } size_t space_capacity(int i) { return _header._space[i]._capacity; } char* region_base(int i) { return _header._space[i]._base; } struct FileMapHeader* header() { return &_header; } static void set_current_info(FileMapInfo* info) { CDS_ONLY(_current_info = info;) } static FileMapInfo* current_info() { CDS_ONLY(return _current_info;) NOT_CDS(return NULL;) } static void assert_mark(bool check); // File manipulation. bool initialize() NOT_CDS_RETURN_(false); bool open_for_read(); void open_for_write(); void write_header(); void write_space(int i, Metaspace* space, bool read_only); void write_region(int region, char* base, size_t size, size_t capacity, bool read_only, bool allow_exec); void write_bytes(const void* buffer, int count); void write_bytes_aligned(const void* buffer, int count); char* map_region(int i); void unmap_region(int i); void close(); bool is_open() { return _file_open; } ReservedSpace reserve_shared_memory(); // JVM/TI RedefineClasses() support: // Remap the shared readonly space to shared readwrite, private. bool remap_shared_readonly_as_readwrite(); // Errors. static void fail_stop(const char *msg, ...); void fail_continue(const char *msg, ...); // Return true if given address is in the mapped shared space. bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); void print_shared_spaces() NOT_CDS_RETURN; static size_t shared_spaces_size() { return align_size_up(SharedReadOnlySize + SharedReadWriteSize + SharedMiscDataSize + SharedMiscCodeSize, os::vm_allocation_granularity()); } // Stop CDS sharing and unmap CDS regions. static void stop_sharing_and_unmap(const char* msg); }; #endif // SHARE_VM_MEMORY_FILEMAP_HPP