jdk8-mips64-public/hotspot: src/share/vm/runtime/sweeper.hpp@b5cb079ecaa4

     1 /*

     2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

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    23  */

    25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP

    26 #define SHARE_VM_RUNTIME_SWEEPER_HPP

    28 // An NmethodSweeper is an incremental cleaner for:

    29 //    - cleanup inline caches

    30 //    - reclamation of unreferences zombie nmethods

    31 //

    33 class NMethodSweeper : public AllStatic {

    34   static long      _traversals;   // Stack traversal count

    35   static nmethod*  _current;      // Current nmethod

    36   static int       _seen;         // Nof. nmethod we have currently processed in current pass of CodeCache

    38   static volatile int      _invocations;   // No. of invocations left until we are completed with this pass

    39   static volatile int      _sweep_started; // Flag to control conc sweeper

    41   static bool      _rescan;          // Indicates that we should do a full rescan of the

    42                                      // of the code cache looking for work to do.

    43   static bool      _do_sweep;        // Flag to skip the conc sweep if no stack scan happened

    44   static int       _locked_seen;     // Number of locked nmethods encountered during the scan

    45   static int       _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack

    47   static bool      _was_full;        // remember if we did emergency unloading

    48   static jint      _advise_to_sweep; // flag to indicate code cache getting full

    49   static jlong     _last_was_full;   // timestamp of last emergency unloading

    50   static uint      _highest_marked;   // highest compile id dumped at last emergency unloading

    51   static long      _was_full_traversal;   // trav number at last emergency unloading

    53   static void process_nmethod(nmethod *nm);

    55   static void release_nmethod(nmethod* nm);

    57   static void log_sweep(const char* msg, const char* format = NULL, ...);

    59  public:

    60   static long traversal_count() { return _traversals; }

    62 #ifdef ASSERT

    63   // Keep track of sweeper activity in the ring buffer

    64   static void record_sweep(nmethod* nm, int line);

    65   static void report_events(int id, address entry);

    66   static void report_events();

    67 #endif

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

    70   static void sweep_code_cache(); // Concurrent part of sweep job

    71   static void possibly_sweep();   // Compiler threads call this to sweep

    73   static void notify(nmethod* nm) {

    74     // Perform a full scan of the code cache from the beginning.  No

    75     // need to synchronize the setting of this flag since it only

    76     // changes to false at safepoint so we can never overwrite it with false.

    77      _rescan = true;

    78   }

    80   static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate

    81   static void speculative_disconnect_nmethods(bool was_full);   // Called by vm op to deal with alloc failure

    83   static void set_was_full(bool state) { _was_full = state; }

    84   static bool was_full() { return _was_full; }

    85 };

    87 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP

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