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src/share/vm/services/memoryUsage.hpp@7bb995fbd3c0 (annotated)

src/share/vm/services/memoryUsage.hpp

Thu, 12 Mar 2009 18:16:36 -0700

author

trims

date

Thu, 12 Mar 2009 18:16:36 -0700

changeset 1063

7bb995fbd3c0

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

Merge

duke@435	1	/*
duke@435	2	* Copyright 2003-2005 Sun Microsystems, Inc. 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	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// A memory usage contains the following attributes about memory usage:
duke@435	26	// initSize - represents the initial amount of memory (in bytes) that
duke@435	27	// the Java virtual machine requests from the operating system
duke@435	28	// for memory management. The Java virtual machine may request
duke@435	29	// additional memory from the operating system later when appropriate.
duke@435	30	// Its value may be undefined.
duke@435	31	// used - represents the amount of memory currently used (in bytes).
duke@435	32	// committed - represents the amount of memory (in bytes) that is
duke@435	33	// guaranteed to be available for use by the Java virtual machine.
duke@435	34	// The amount of committed memory may change over time (increase
duke@435	35	// or decrease). It is guaranteed to be greater than or equal
duke@435	36	// to initSize.
duke@435	37	// maxSize - represents the maximum amount of memory (in bytes)
duke@435	38	// that can be used for memory management. The maximum amount of
duke@435	39	// memory for memory management could be less than the amount of
duke@435	40	// committed memory. Its value may be undefined.
duke@435	41
duke@435	42	class MemoryUsage VALUE_OBJ_CLASS_SPEC {
duke@435	43	private:
duke@435	44	size_t _initSize;
duke@435	45	size_t _used;
duke@435	46	size_t _committed;
duke@435	47	size_t _maxSize;
duke@435	48
duke@435	49	public:
duke@435	50	// Constructors
duke@435	51	MemoryUsage(size_t i, size_t u, size_t c, size_t m) :
duke@435	52	_initSize(i), _used(u), _committed(c), _maxSize(m) {};
duke@435	53	MemoryUsage() :
duke@435	54	_initSize(0), _used(0), _committed(0), _maxSize(0) {};
duke@435	55
duke@435	56	size_t init_size() const { return _initSize; }
duke@435	57	size_t used() const { return _used; }
duke@435	58	size_t committed() const { return _committed; }
duke@435	59	size_t max_size() const { return _maxSize; }
duke@435	60
duke@435	61	inline static jlong convert_to_jlong(size_t val) {
duke@435	62	// In the 64-bit vm, a size_t can overflow a jlong (which is signed).
duke@435	63	jlong ret;
duke@435	64	if (val == (size_t)-1) {
duke@435	65	ret = -1L;
duke@435	66	} else {
duke@435	67	NOT_LP64(ret = val;)
duke@435	68	LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);)
duke@435	69	}
duke@435	70	return ret;
duke@435	71	}
duke@435	72
duke@435	73	jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); }
duke@435	74	jlong used_as_jlong() const { return convert_to_jlong(_used); }
duke@435	75	jlong committed_as_jlong() const { return convert_to_jlong(_committed); }
duke@435	76	jlong max_size_as_jlong() const { return convert_to_jlong(_maxSize); }
duke@435	77	};