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src/share/vm/runtime/sweeper.hpp@b5cb079ecaa4 (annotated)

src/share/vm/runtime/sweeper.hpp

Sun, 03 Feb 2013 22:43:57 +0100

author

ewendeli

date

Sun, 03 Feb 2013 22:43:57 +0100

changeset 4703

b5cb079ecaa4

parent 4037

da91efe96a93

child 5038

0cfa93c2fcc4

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
never@1999	38	static volatile int _invocations; // No. of invocations left until we are completed with this pass
never@1999	39	static volatile int _sweep_started; // Flag to control conc sweeper
duke@435	40
duke@435	41	static bool _rescan; // Indicates that we should do a full rescan of the
duke@435	42	// of the code cache looking for work to do.
never@1893	43	static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened
duke@435	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
duke@435	46
kvn@1637	47	static bool _was_full; // remember if we did emergency unloading
kvn@1637	48	static jint _advise_to_sweep; // flag to indicate code cache getting full
kvn@1637	49	static jlong _last_was_full; // timestamp of last emergency unloading
kvn@1637	50	static uint _highest_marked; // highest compile id dumped at last emergency unloading
kvn@1637	51	static long _was_full_traversal; // trav number at last emergency unloading
duke@435	52
duke@435	53	static void process_nmethod(nmethod *nm);
never@1999	54
coleenp@4037	55	static void release_nmethod(nmethod* nm);
coleenp@4037	56
never@1999	57	static void log_sweep(const char* msg, const char* format = NULL, ...);
never@1999	58
duke@435	59	public:
duke@435	60	static long traversal_count() { return _traversals; }
duke@435	61
never@2916	62	#ifdef ASSERT
never@2916	63	// Keep track of sweeper activity in the ring buffer
never@2916	64	static void record_sweep(nmethod* nm, int line);
never@2916	65	static void report_events(int id, address entry);
never@2916	66	static void report_events();
never@2916	67	#endif
never@2916	68
never@1893	69	static void scan_stacks(); // Invoked at the end of each safepoint
never@1893	70	static void sweep_code_cache(); // Concurrent part of sweep job
never@1893	71	static void possibly_sweep(); // Compiler threads call this to sweep
duke@435	72
duke@435	73	static void notify(nmethod* nm) {
duke@435	74	// Perform a full scan of the code cache from the beginning. No
duke@435	75	// need to synchronize the setting of this flag since it only
duke@435	76	// changes to false at safepoint so we can never overwrite it with false.
duke@435	77	_rescan = true;
duke@435	78	}
kvn@1637	79
kvn@1637	80	static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
kvn@1637	81	static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
kvn@1637	82
kvn@1637	83	static void set_was_full(bool state) { _was_full = state; }
kvn@1637	84	static bool was_full() { return _was_full; }
duke@435	85	};
stefank@2314	86
stefank@2314	87	#endif // SHARE_VM_RUNTIME_SWEEPER_HPP