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src/share/vm/runtime/statSampler.hpp@63147986a428 (annotated)

src/share/vm/runtime/statSampler.hpp

Wed, 18 Sep 2013 07:02:10 -0700

author

dcubed

date

Wed, 18 Sep 2013 07:02:10 -0700

changeset 5743

63147986a428

parent 2314

f95d63e2154a

child 6876

710a3c8b516e

permissions

-rw-r--r--

8019835: Strings interned in different threads equal but does not ==
Summary: Add -XX:+VerifyStringTableAtExit option and code to verify StringTable invariants.
Reviewed-by: rdurbin, sspitsyn, coleenp

duke@435	1	/*
stefank@2314	2	* Copyright (c) 2001, 2010, 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_RUNTIME_STATSAMPLER_HPP
stefank@2314	26	#define SHARE_VM_RUNTIME_STATSAMPLER_HPP
stefank@2314	27
stefank@2314	28	#include "runtime/perfData.hpp"
stefank@2314	29	#include "runtime/task.hpp"
stefank@2314	30
duke@435	31	class StatSamplerTask;
duke@435	32
duke@435	33	/*
duke@435	34	* The StatSampler class is responsible for periodically updating
duke@435	35	* sampled PerfData instances and writing the sampled values to the
duke@435	36	* PerfData memory region.
duke@435	37	*
duke@435	38	* In addition it is also responsible for providing a home for
duke@435	39	* PerfData instances that otherwise have no better home.
duke@435	40	*/
duke@435	41	class StatSampler : AllStatic {
duke@435	42
duke@435	43	friend class StatSamplerTask;
duke@435	44
duke@435	45	private:
duke@435	46
duke@435	47	static StatSamplerTask* _task;
duke@435	48	static PerfDataList* _sampled;
duke@435	49
duke@435	50	static void collect_sample();
duke@435	51	static void create_misc_perfdata();
duke@435	52	static void create_sampled_perfdata();
duke@435	53	static void sample_data(PerfDataList* list);
duke@435	54	static const char* get_system_property(const char* name, TRAPS);
duke@435	55	static void create_system_property_instrumentation(TRAPS);
duke@435	56
duke@435	57	public:
duke@435	58	// Start/stop the sampler
duke@435	59	static void engage();
duke@435	60	static void disengage();
duke@435	61
duke@435	62	static bool is_active() { return _task != NULL; }
duke@435	63
duke@435	64	static void initialize();
duke@435	65	static void destroy();
duke@435	66	};
duke@435	67
duke@435	68	void statSampler_exit();
stefank@2314	69
stefank@2314	70	#endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP