author | jrose |
Wed, 09 Jun 2010 18:50:45 -0700 | |
changeset 5882 | 6b2aecc4f7d8 |
parent 5547 | f4b087cbb361 |
child 5895 | 7127e98012e3 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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// An NmethodSweeper is an incremental cleaner for: |
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// - cleanup inline caches |
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// - reclamation of unreferences zombie nmethods |
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// |
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class NMethodSweeper : public AllStatic { |
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static long _traversals; // Stack traversal count |
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static CodeBlob* _current; // Current nmethod |
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static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache |
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static int _invocations; // No. of invocations left until we are completed with this pass |
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static bool _rescan; // Indicates that we should do a full rescan of the |
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// of the code cache looking for work to do. |
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static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened |
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static jint _sweep_started; // Flag to control conc sweeper |
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static int _locked_seen; // Number of locked nmethods encountered during the scan |
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static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack |
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static bool _was_full; // remember if we did emergency unloading |
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static jint _advise_to_sweep; // flag to indicate code cache getting full |
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static jlong _last_was_full; // timestamp of last emergency unloading |
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static uint _highest_marked; // highest compile id dumped at last emergency unloading |
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static long _was_full_traversal; // trav number at last emergency unloading |
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static void process_nmethod(nmethod *nm); |
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public: |
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static long traversal_count() { return _traversals; } |
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static void scan_stacks(); // Invoked at the end of each safepoint |
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static void sweep_code_cache(); // Concurrent part of sweep job |
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static void possibly_sweep(); // Compiler threads call this to sweep |
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static void notify(nmethod* nm) { |
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// Perform a full scan of the code cache from the beginning. No |
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// need to synchronize the setting of this flag since it only |
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// changes to false at safepoint so we can never overwrite it with false. |
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_rescan = true; |
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} |
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static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate |
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static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure |
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static void set_was_full(bool state) { _was_full = state; } |
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static bool was_full() { return _was_full; } |
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}; |