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src/share/vm/runtime/sweeper.hpp@2a47bd84841f (annotated)

src/share/vm/runtime/sweeper.hpp

Thu, 08 Jul 2010 14:29:44 -0700

author

never

date

Thu, 08 Jul 2010 14:29:44 -0700

changeset 1999

2a47bd84841f

parent 1970

ff38d05ea86f

child 2314

f95d63e2154a

permissions

-rw-r--r--

6965184: possible races in make_not_entrant_or_zombie
Reviewed-by: kvn

duke@435	1	/*
never@1999	2	* Copyright (c) 1997, 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
duke@435	25	// An NmethodSweeper is an incremental cleaner for:
duke@435	26	// - cleanup inline caches
duke@435	27	// - reclamation of unreferences zombie nmethods
duke@435	28	//
duke@435	29
duke@435	30	class NMethodSweeper : public AllStatic {
duke@435	31	static long _traversals; // Stack traversal count
never@1970	32	static nmethod* _current; // Current nmethod
duke@435	33	static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
never@1999	34
never@1999	35	static volatile int _invocations; // No. of invocations left until we are completed with this pass
never@1999	36	static volatile int _sweep_started; // Flag to control conc sweeper
duke@435	37
duke@435	38	static bool _rescan; // Indicates that we should do a full rescan of the
duke@435	39	// of the code cache looking for work to do.
never@1893	40	static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened
duke@435	41	static int _locked_seen; // Number of locked nmethods encountered during the scan
duke@435	42	static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
duke@435	43
kvn@1637	44	static bool _was_full; // remember if we did emergency unloading
kvn@1637	45	static jint _advise_to_sweep; // flag to indicate code cache getting full
kvn@1637	46	static jlong _last_was_full; // timestamp of last emergency unloading
kvn@1637	47	static uint _highest_marked; // highest compile id dumped at last emergency unloading
kvn@1637	48	static long _was_full_traversal; // trav number at last emergency unloading
duke@435	49
duke@435	50	static void process_nmethod(nmethod *nm);
never@1999	51
never@1999	52	static void log_sweep(const char* msg, const char* format = NULL, ...);
never@1999	53
duke@435	54	public:
duke@435	55	static long traversal_count() { return _traversals; }
duke@435	56
never@1893	57	static void scan_stacks(); // Invoked at the end of each safepoint
never@1893	58	static void sweep_code_cache(); // Concurrent part of sweep job
never@1893	59	static void possibly_sweep(); // Compiler threads call this to sweep
duke@435	60
duke@435	61	static void notify(nmethod* nm) {
duke@435	62	// Perform a full scan of the code cache from the beginning. No
duke@435	63	// need to synchronize the setting of this flag since it only
duke@435	64	// changes to false at safepoint so we can never overwrite it with false.
duke@435	65	_rescan = true;
duke@435	66	}
kvn@1637	67
kvn@1637	68	static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
kvn@1637	69	static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
kvn@1637	70
kvn@1637	71	static void set_was_full(bool state) { _was_full = state; }
kvn@1637	72	static bool was_full() { return _was_full; }
duke@435	73	};