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src/share/vm/runtime/sweeper.hpp@ec173c8f3739 (annotated)

src/share/vm/runtime/sweeper.hpp

Thu, 11 Jul 2013 01:11:52 -0700

author

roland

date

Thu, 11 Jul 2013 01:11:52 -0700

changeset 5385

ec173c8f3739

parent 5237

f2110083203d

child 5548

5888334c9c24

permissions

-rw-r--r--

Merge

duke@435	1	/*
sla@5237	2	* Copyright (c) 1997, 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_RUNTIME_SWEEPER_HPP
stefank@2314	26	#define SHARE_VM_RUNTIME_SWEEPER_HPP
stefank@2314	27
duke@435	28	// An NmethodSweeper is an incremental cleaner for:
duke@435	29	// - cleanup inline caches
duke@435	30	// - reclamation of unreferences zombie nmethods
duke@435	31	//
duke@435	32
duke@435	33	class NMethodSweeper : public AllStatic {
sla@5237	34	static long _traversals; // Stack scan count, also sweep ID.
sla@5237	35	static nmethod* _current; // Current nmethod
sla@5237	36	static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
sla@5237	37	static int _flushed_count; // Nof. nmethods flushed in current sweep
sla@5237	38	static int _zombified_count; // Nof. nmethods made zombie in current sweep
sla@5237	39	static int _marked_count; // Nof. nmethods marked for reclaim in current sweep
never@1999	40
neliasso@5038	41	static volatile int _invocations; // No. of invocations left until we are completed with this pass
neliasso@5038	42	static volatile int _sweep_started; // Flag to control conc sweeper
duke@435	43
neliasso@5038	44	//The following are reset in scan_stacks and synchronized by the safepoint
neliasso@5038	45	static bool _resweep; // Indicates that a change has happend and we want another sweep,
neliasso@5038	46	// always checked and reset at a safepoint so memory will be in sync.
neliasso@5038	47	static int _locked_seen; // Number of locked nmethods encountered during the scan
duke@435	48	static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
neliasso@5038	49	static jint _flush_token; // token that guards method flushing, making sure it is executed only once.
duke@435	50
neliasso@5038	51	// These are set during a flush, a VM-operation
neliasso@5038	52	static long _last_flush_traversal_id; // trav number at last flush unloading
neliasso@5038	53	static jlong _last_full_flush_time; // timestamp of last emergency unloading
neliasso@5038	54
neliasso@5038	55	// These are synchronized by the _sweep_started token
neliasso@5038	56	static int _highest_marked; // highest compile id dumped at last emergency unloading
neliasso@5038	57	static int _dead_compile_ids; // number of compile ids that where not in the cache last flush
duke@435	58
sla@5237	59	// Stat counters
sla@5237	60	static int _number_of_flushes; // Total of full traversals caused by full cache
sla@5237	61	static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed
sla@5237	62	static jlong _total_time_sweeping; // Accumulated time sweeping
sla@5237	63	static jlong _total_time_this_sweep; // Total time this sweep
sla@5237	64	static jlong _peak_sweep_time; // Peak time for a full sweep
sla@5237	65	static jlong _peak_sweep_fraction_time; // Peak time sweeping one fraction
sla@5237	66	static jlong _total_disconnect_time; // Total time cleaning code mem
sla@5237	67	static jlong _peak_disconnect_time; // Peak time cleaning code mem
sla@5237	68
duke@435	69	static void process_nmethod(nmethod *nm);
coleenp@4037	70	static void release_nmethod(nmethod* nm);
coleenp@4037	71
never@1999	72	static void log_sweep(const char* msg, const char* format = NULL, ...);
neliasso@5038	73	static bool sweep_in_progress();
never@1999	74
duke@435	75	public:
sla@5237	76	static long traversal_count() { return _traversals; }
sla@5237	77	static int number_of_flushes() { return _number_of_flushes; }
sla@5237	78	static int total_nof_methods_reclaimed() { return _total_nof_methods_reclaimed; }
sla@5237	79	static jlong total_time_sweeping() { return _total_time_sweeping; }
sla@5237	80	static jlong peak_sweep_time() { return _peak_sweep_time; }
sla@5237	81	static jlong peak_sweep_fraction_time() { return _peak_sweep_fraction_time; }
sla@5237	82	static jlong total_disconnect_time() { return _total_disconnect_time; }
sla@5237	83	static jlong peak_disconnect_time() { return _peak_disconnect_time; }
duke@435	84
never@2916	85	#ifdef ASSERT
never@2916	86	// Keep track of sweeper activity in the ring buffer
never@2916	87	static void record_sweep(nmethod* nm, int line);
never@2916	88	static void report_events(int id, address entry);
never@2916	89	static void report_events();
never@2916	90	#endif
never@2916	91
never@1893	92	static void scan_stacks(); // Invoked at the end of each safepoint
never@1893	93	static void sweep_code_cache(); // Concurrent part of sweep job
never@1893	94	static void possibly_sweep(); // Compiler threads call this to sweep
duke@435	95
duke@435	96	static void notify(nmethod* nm) {
neliasso@5038	97	// Request a new sweep of the code cache from the beginning. No
duke@435	98	// need to synchronize the setting of this flag since it only
duke@435	99	// changes to false at safepoint so we can never overwrite it with false.
neliasso@5038	100	_resweep = true;
duke@435	101	}
kvn@1637	102
kvn@1637	103	static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
kvn@1637	104	static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
duke@435	105	};
stefank@2314	106
stefank@2314	107	#endif // SHARE_VM_RUNTIME_SWEEPER_HPP