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src/share/vm/runtime/statSampler.hpp@7ee622712fcf (annotated)

src/share/vm/runtime/statSampler.hpp

Tue, 04 Mar 2008 09:44:24 -0500

author

sbohne

date

Tue, 04 Mar 2008 09:44:24 -0500

changeset 493

7ee622712fcf

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread
Summary: Enqueue VM_EnableBiasedLocking operation asynchronously
Reviewed-by: never, xlu, kbr, acorn

duke@435	1	/*
duke@435	2	* Copyright 2001-2002 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	class StatSamplerTask;
duke@435	26
duke@435	27	/*
duke@435	28	* The StatSampler class is responsible for periodically updating
duke@435	29	* sampled PerfData instances and writing the sampled values to the
duke@435	30	* PerfData memory region.
duke@435	31	*
duke@435	32	* In addition it is also responsible for providing a home for
duke@435	33	* PerfData instances that otherwise have no better home.
duke@435	34	*/
duke@435	35	class StatSampler : AllStatic {
duke@435	36
duke@435	37	friend class StatSamplerTask;
duke@435	38
duke@435	39	private:
duke@435	40
duke@435	41	static StatSamplerTask* _task;
duke@435	42	static PerfDataList* _sampled;
duke@435	43
duke@435	44	static void collect_sample();
duke@435	45	static void create_misc_perfdata();
duke@435	46	static void create_sampled_perfdata();
duke@435	47	static void sample_data(PerfDataList* list);
duke@435	48	static const char* get_system_property(const char* name, TRAPS);
duke@435	49	static void create_system_property_instrumentation(TRAPS);
duke@435	50
duke@435	51	public:
duke@435	52	// Start/stop the sampler
duke@435	53	static void engage();
duke@435	54	static void disengage();
duke@435	55
duke@435	56	static bool is_active() { return _task != NULL; }
duke@435	57
duke@435	58	static void initialize();
duke@435	59	static void destroy();
duke@435	60	};
duke@435	61
duke@435	62	void statSampler_exit();