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src/share/vm/gc_implementation/shared/gSpaceCounters.hpp@a61af66fc99e (annotated)

src/share/vm/gc_implementation/shared/gSpaceCounters.hpp

Sat, 01 Dec 2007 00:00:00 +0000

author

duke

date

Sat, 01 Dec 2007 00:00:00 +0000

changeset 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

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duke@435	1	/*
duke@435	2	* Copyright 2002-2004 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 GSpaceCounter is a holder class for performance counters
duke@435	26	// that track a space;
duke@435	27
duke@435	28	class GSpaceCounters: public CHeapObj {
duke@435	29	friend class VMStructs;
duke@435	30
duke@435	31	private:
duke@435	32	PerfVariable* _capacity;
duke@435	33	PerfVariable* _used;
duke@435	34
duke@435	35	// Constant PerfData types don't need to retain a reference.
duke@435	36	// However, it's a good idea to document them here.
duke@435	37	// PerfConstant* _size;
duke@435	38
duke@435	39	Generation* _gen;
duke@435	40	char* _name_space;
duke@435	41
duke@435	42	public:
duke@435	43
duke@435	44	GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g,
duke@435	45	GenerationCounters* gc, bool sampled=true);
duke@435	46
duke@435	47	~GSpaceCounters() {
duke@435	48	if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
duke@435	49	}
duke@435	50
duke@435	51	inline void update_capacity() {
duke@435	52	_capacity->set_value(_gen->capacity());
duke@435	53	}
duke@435	54
duke@435	55	inline void update_used() {
duke@435	56	_used->set_value(_gen->used());
duke@435	57	}
duke@435	58
duke@435	59	// special version of update_used() to allow the used value to be
duke@435	60	// passed as a parameter. This method can can be used in cases were
duke@435	61	// the utilization is already known and/or when the _gen->used()
duke@435	62	// method is known to be expensive and we want to avoid unnecessary
duke@435	63	// calls to it.
duke@435	64	//
duke@435	65	inline void update_used(size_t used) {
duke@435	66	_used->set_value(used);
duke@435	67	}
duke@435	68
duke@435	69	inline void inc_used(size_t size) {
duke@435	70	_used->inc(size);
duke@435	71	}
duke@435	72
duke@435	73	debug_only(
duke@435	74	// for security reasons, we do not allow arbitrary reads from
duke@435	75	// the counters as they may live in shared memory.
duke@435	76	jlong used() {
duke@435	77	return _used->get_value();
duke@435	78	}
duke@435	79	jlong capacity() {
duke@435	80	return _used->get_value();
duke@435	81	}
duke@435	82	)
duke@435	83
duke@435	84	inline void update_all() {
duke@435	85	update_used();
duke@435	86	update_capacity();
duke@435	87	}
duke@435	88
duke@435	89	const char* name_space() const { return _name_space; }
duke@435	90	};
duke@435	91
duke@435	92	class GenerationUsedHelper : public PerfLongSampleHelper {
duke@435	93	private:
duke@435	94	Generation* _gen;
duke@435	95
duke@435	96	public:
duke@435	97	GenerationUsedHelper(Generation* g) : _gen(g) { }
duke@435	98
duke@435	99	inline jlong take_sample() {
duke@435	100	return _gen->used();
duke@435	101	}
duke@435	102	};