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src/share/vm/runtime/sweeper.hpp@9ce110b1d14a (annotated)

src/share/vm/runtime/sweeper.hpp

Thu, 02 May 2013 18:50:05 -0700

author

kvn

date

Thu, 02 May 2013 18:50:05 -0700

changeset 5040

9ce110b1d14a

parent 5038

0cfa93c2fcc4

child 5237

f2110083203d

permissions

-rw-r--r--

Merge

duke@435	1	/*
coleenp@4037	2	* Copyright (c) 1997, 2012, 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 {
duke@435	34	static long _traversals; // Stack traversal count
never@1970	35	static nmethod* _current; // Current nmethod
duke@435	36	static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
never@1999	37
neliasso@5038	38	static volatile int _invocations; // No. of invocations left until we are completed with this pass
neliasso@5038	39	static volatile int _sweep_started; // Flag to control conc sweeper
duke@435	40
neliasso@5038	41	//The following are reset in scan_stacks and synchronized by the safepoint
neliasso@5038	42	static bool _resweep; // Indicates that a change has happend and we want another sweep,
neliasso@5038	43	// always checked and reset at a safepoint so memory will be in sync.
neliasso@5038	44	static int _locked_seen; // Number of locked nmethods encountered during the scan
duke@435	45	static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
neliasso@5038	46	static jint _flush_token; // token that guards method flushing, making sure it is executed only once.
duke@435	47
neliasso@5038	48	// These are set during a flush, a VM-operation
neliasso@5038	49	static long _last_flush_traversal_id; // trav number at last flush unloading
neliasso@5038	50	static jlong _last_full_flush_time; // timestamp of last emergency unloading
neliasso@5038	51
neliasso@5038	52	// These are synchronized by the _sweep_started token
neliasso@5038	53	static int _highest_marked; // highest compile id dumped at last emergency unloading
neliasso@5038	54	static int _dead_compile_ids; // number of compile ids that where not in the cache last flush
duke@435	55
duke@435	56	static void process_nmethod(nmethod *nm);
coleenp@4037	57	static void release_nmethod(nmethod* nm);
coleenp@4037	58
never@1999	59	static void log_sweep(const char* msg, const char* format = NULL, ...);
neliasso@5038	60	static bool sweep_in_progress();
never@1999	61
duke@435	62	public:
duke@435	63	static long traversal_count() { return _traversals; }
duke@435	64
never@2916	65	#ifdef ASSERT
never@2916	66	// Keep track of sweeper activity in the ring buffer
never@2916	67	static void record_sweep(nmethod* nm, int line);
never@2916	68	static void report_events(int id, address entry);
never@2916	69	static void report_events();
never@2916	70	#endif
never@2916	71
never@1893	72	static void scan_stacks(); // Invoked at the end of each safepoint
never@1893	73	static void sweep_code_cache(); // Concurrent part of sweep job
never@1893	74	static void possibly_sweep(); // Compiler threads call this to sweep
duke@435	75
duke@435	76	static void notify(nmethod* nm) {
neliasso@5038	77	// Request a new sweep of the code cache from the beginning. No
duke@435	78	// need to synchronize the setting of this flag since it only
duke@435	79	// changes to false at safepoint so we can never overwrite it with false.
neliasso@5038	80	_resweep = true;
duke@435	81	}
kvn@1637	82
kvn@1637	83	static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
kvn@1637	84	static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
duke@435	85	};
stefank@2314	86
stefank@2314	87	#endif // SHARE_VM_RUNTIME_SWEEPER_HPP