view src/share/vm/runtime/sweeper.hpp @ 61:5a76ab815e34

6667833: Remove CacheTimeMillis Summary: Remove -XX:+CacheTimeMillis option and associated functionality Reviewed-by: acorn, never
author sbohne
date Wed, 19 Mar 2008 09:58:01 -0400
parents
children 5f24d0319e54
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/*
 * Copyright 1997-2005 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

// An NmethodSweeper is an incremental cleaner for:
//    - cleanup inline caches
//    - reclamation of unreferences zombie nmethods
//

class NMethodSweeper : public AllStatic {
  static long      _traversals;   // Stack traversal count
  static CodeBlob* _current;      // Current nmethod
  static int       _seen;         // Nof. nmethod we have currently processed in current pass of CodeCache
  static int       _invocations;  // No. of invocations left until we are completed with this pass

  static bool      _rescan;          // Indicates that we should do a full rescan of the
                                     // of the code cache looking for work to do.
  static int       _locked_seen;     // Number of locked nmethods encountered during the scan
  static int       _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack


  static void process_nmethod(nmethod *nm);
 public:
  static long traversal_count() { return _traversals; }

  static void sweep();  // Invoked at the end of each safepoint

  static void notify(nmethod* nm) {
    // Perform a full scan of the code cache from the beginning.  No
    // need to synchronize the setting of this flag since it only
    // changes to false at safepoint so we can never overwrite it with false.
     _rescan = true;
  }
};