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src/share/vm/memory/filemap.hpp@85c1ca43713f (annotated)

src/share/vm/memory/filemap.hpp

Mon, 07 Oct 2013 15:51:08 +0200

author

stefank

date

Mon, 07 Oct 2013 15:51:08 +0200

changeset 5863

85c1ca43713f

parent 5528

740e263c80c6

child 6868

ca6d25be853b

child 7089

6e0cb14ce59b

permissions

-rw-r--r--

8024547: MaxMetaspaceSize should limit the committed memory used by the metaspaces
Reviewed-by: brutisso, jmasa, coleenp

duke@435	1	/*
hseigel@5528	2	* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_MEMORY_FILEMAP_HPP
stefank@2314	26	#define SHARE_VM_MEMORY_FILEMAP_HPP
stefank@2314	27
coleenp@4037	28	#include "memory/metaspaceShared.hpp"
stefank@5863	29	#include "memory/metaspace.hpp"
stefank@2314	30
duke@435	31	// Layout of the file:
duke@435	32	// header: dump of archive instance plus versioning info, datestamp, etc.
duke@435	33	// [magic # = 0xF00BABA2]
duke@435	34	// ... padding to align on page-boundary
duke@435	35	// read-write space from CompactingPermGenGen
duke@435	36	// read-only space from CompactingPermGenGen
duke@435	37	// misc data (block offset table, string table, symbols, dictionary, etc.)
duke@435	38	// tag(666)
duke@435	39
duke@435	40	static const int JVM_SHARED_JARS_MAX = 128;
duke@435	41	static const int JVM_SPACENAME_MAX = 128;
duke@435	42	static const int JVM_IDENT_MAX = 256;
duke@435	43	static const int JVM_ARCH_MAX = 12;
duke@435	44
duke@435	45
coleenp@4037	46	class Metaspace;
duke@435	47
zgu@3900	48	class FileMapInfo : public CHeapObj<mtInternal> {
duke@435	49	private:
duke@435	50	enum {
duke@435	51	_invalid_version = -1,
duke@435	52	_current_version = 1
duke@435	53	};
duke@435	54
duke@435	55	bool _file_open;
duke@435	56	int _fd;
duke@435	57	long _file_offset;
duke@435	58
duke@435	59	// FileMapHeader describes the shared space data in the file to be
duke@435	60	// mapped. This structure gets written to a file. It is not a class, so
duke@435	61	// that the compilers don't add any compiler-private data to it.
duke@435	62
duke@435	63	struct FileMapHeader {
duke@435	64	int _magic; // identify file type.
duke@435	65	int _version; // (from enum, above.)
duke@435	66	size_t _alignment; // how shared archive should be aligned
hseigel@4397	67	int _obj_alignment; // value of ObjectAlignmentInBytes
duke@435	68
duke@435	69	struct space_info {
duke@435	70	int _file_offset; // sizeof(this) rounded to vm page size
duke@435	71	char* _base; // copy-on-write base address
duke@435	72	size_t _capacity; // for validity checking
duke@435	73	size_t _used; // for setting space top on read
duke@435	74	bool _read_only; // read only space?
duke@435	75	bool _allow_exec; // executable code in space?
coleenp@4037	76	} _space[MetaspaceShared::n_regions];
duke@435	77
duke@435	78	// The following fields are all sanity checks for whether this archive
duke@435	79	// will function correctly with this JVM and the bootclasspath it's
duke@435	80	// invoked with.
duke@435	81	char _arch[JVM_ARCH_MAX]; // architecture
duke@435	82	char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm
duke@435	83	int _num_jars; // Number of jars in bootclasspath
duke@435	84
duke@435	85	// Per jar file data: timestamp, size.
duke@435	86
duke@435	87	struct {
duke@435	88	time_t _timestamp; // jar timestamp.
duke@435	89	long _filesize; // jar file size.
duke@435	90	} _jar[JVM_SHARED_JARS_MAX];
duke@435	91	} _header;
duke@435	92	const char* _full_path;
duke@435	93
duke@435	94	static FileMapInfo* _current_info;
duke@435	95
duke@435	96	bool init_from_file(int fd);
duke@435	97	void align_file_position();
duke@435	98
duke@435	99	public:
duke@435	100	FileMapInfo() {
duke@435	101	_file_offset = 0;
duke@435	102	_file_open = false;
duke@435	103	_header._version = _invalid_version;
duke@435	104	}
duke@435	105
duke@435	106	static int current_version() { return _current_version; }
duke@435	107	void populate_header(size_t alignment);
duke@435	108	bool validate();
duke@435	109	void invalidate();
duke@435	110	int version() { return _header._version; }
duke@435	111	size_t alignment() { return _header._alignment; }
duke@435	112	size_t space_capacity(int i) { return _header._space[i]._capacity; }
duke@435	113	char* region_base(int i) { return _header._space[i]._base; }
duke@435	114	struct FileMapHeader* header() { return &_header; }
duke@435	115
jprovino@4720	116	static void set_current_info(FileMapInfo* info) {
jprovino@4720	117	CDS_ONLY(_current_info = info;)
jprovino@4720	118	}
jprovino@4720	119
jprovino@4720	120	static FileMapInfo* current_info() {
jprovino@4720	121	CDS_ONLY(return _current_info;)
jprovino@4720	122	NOT_CDS(return NULL;)
jprovino@4720	123	}
jprovino@4720	124
duke@435	125	static void assert_mark(bool check);
duke@435	126
duke@435	127	// File manipulation.
jprovino@4720	128	bool initialize() NOT_CDS_RETURN_(false);
duke@435	129	bool open_for_read();
duke@435	130	void open_for_write();
duke@435	131	void write_header();
coleenp@4037	132	void write_space(int i, Metaspace* space, bool read_only);
duke@435	133	void write_region(int region, char* base, size_t size,
duke@435	134	size_t capacity, bool read_only, bool allow_exec);
duke@435	135	void write_bytes(const void* buffer, int count);
duke@435	136	void write_bytes_aligned(const void* buffer, int count);
coleenp@4037	137	char* map_region(int i);
duke@435	138	void unmap_region(int i);
duke@435	139	void close();
duke@435	140	bool is_open() { return _file_open; }
coleenp@4037	141	ReservedSpace reserve_shared_memory();
duke@435	142
duke@435	143	// JVM/TI RedefineClasses() support:
duke@435	144	// Remap the shared readonly space to shared readwrite, private.
duke@435	145	bool remap_shared_readonly_as_readwrite();
duke@435	146
duke@435	147	// Errors.
duke@435	148	static void fail_stop(const char *msg, ...);
duke@435	149	void fail_continue(const char *msg, ...);
duke@435	150
duke@435	151	// Return true if given address is in the mapped shared space.
jprovino@4720	152	bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false);
iklam@5329	153	void print_shared_spaces() NOT_CDS_RETURN;
hseigel@5528	154
hseigel@5528	155	static size_t shared_spaces_size() {
hseigel@5528	156	return align_size_up(SharedReadOnlySize + SharedReadWriteSize +
hseigel@5528	157	SharedMiscDataSize + SharedMiscCodeSize,
hseigel@5528	158	os::vm_allocation_granularity());
hseigel@5528	159	}
hseigel@5528	160
hseigel@5528	161	// Stop CDS sharing and unmap CDS regions.
hseigel@5528	162	static void stop_sharing_and_unmap(const char* msg);
duke@435	163	};
stefank@2314	164
stefank@2314	165	#endif // SHARE_VM_MEMORY_FILEMAP_HPP