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annotate src/share/vm/runtime/sweeper.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents f52ed367b66d
children 0cfa93c2fcc4
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1 /*
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP
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26 #define SHARE_VM_RUNTIME_SWEEPER_HPP
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27
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28 // An NmethodSweeper is an incremental cleaner for:
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29 // - cleanup inline caches
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30 // - reclamation of unreferences zombie nmethods
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31 //
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32
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33 class NMethodSweeper : public AllStatic {
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34 static long _traversals; // Stack traversal count
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35 static nmethod* _current; // Current nmethod
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36 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
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37
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38 static volatile int _invocations; // No. of invocations left until we are completed with this pass
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39 static volatile int _sweep_started; // Flag to control conc sweeper
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40
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41 static bool _rescan; // Indicates that we should do a full rescan of the
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42 // of the code cache looking for work to do.
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43 static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened
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44 static int _locked_seen; // Number of locked nmethods encountered during the scan
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45 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
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46
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47 static bool _was_full; // remember if we did emergency unloading
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48 static jint _advise_to_sweep; // flag to indicate code cache getting full
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49 static jlong _last_was_full; // timestamp of last emergency unloading
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50 static uint _highest_marked; // highest compile id dumped at last emergency unloading
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51 static long _was_full_traversal; // trav number at last emergency unloading
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52
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53 static void process_nmethod(nmethod *nm);
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54
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55 static void release_nmethod(nmethod* nm);
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56
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57 static void log_sweep(const char* msg, const char* format = NULL, ...);
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58
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59 public:
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60 static long traversal_count() { return _traversals; }
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61
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62 #ifdef ASSERT
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63 // Keep track of sweeper activity in the ring buffer
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64 static void record_sweep(nmethod* nm, int line);
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65 static void report_events(int id, address entry);
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66 static void report_events();
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67 #endif
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68
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69 static void scan_stacks(); // Invoked at the end of each safepoint
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70 static void sweep_code_cache(); // Concurrent part of sweep job
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71 static void possibly_sweep(); // Compiler threads call this to sweep
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73 static void notify(nmethod* nm) {
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74 // Perform a full scan of the code cache from the beginning. No
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75 // need to synchronize the setting of this flag since it only
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76 // changes to false at safepoint so we can never overwrite it with false.
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77 _rescan = true;
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78 }
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80 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
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81 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
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82
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83 static void set_was_full(bool state) { _was_full = state; }
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84 static bool was_full() { return _was_full; }
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85 };
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87 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP