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annotate src/share/vm/runtime/sweeper.hpp @ 10241:d17700c82d7d

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8006088: Incompatible heap size flags accepted by VM Summary: Make processing of minimum, initial and maximum heap size more intiutive by removing previous limitations on allowed values, and make error reporting consistent. Further, fix errors in ergonomic heap sizing. Reviewed-by: johnc, jwilhelm, tamao
author tschatzl
date Mon, 06 May 2013 17:19:42 +0200
parents 0cfa93c2fcc4
children f2110083203d
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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 //The following are reset in scan_stacks and synchronized by the safepoint
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42 static bool _resweep; // Indicates that a change has happend and we want another sweep,
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43 // always checked and reset at a safepoint so memory will be in sync.
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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 static jint _flush_token; // token that guards method flushing, making sure it is executed only once.
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47
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48 // These are set during a flush, a VM-operation
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49 static long _last_flush_traversal_id; // trav number at last flush unloading
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50 static jlong _last_full_flush_time; // timestamp of last emergency unloading
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51
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52 // These are synchronized by the _sweep_started token
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53 static int _highest_marked; // highest compile id dumped at last emergency unloading
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54 static int _dead_compile_ids; // number of compile ids that where not in the cache last flush
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55
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56 static void process_nmethod(nmethod *nm);
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57 static void release_nmethod(nmethod* nm);
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58
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59 static void log_sweep(const char* msg, const char* format = NULL, ...);
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60 static bool sweep_in_progress();
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61
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62 public:
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63 static long traversal_count() { return _traversals; }
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64
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65 #ifdef ASSERT
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66 // Keep track of sweeper activity in the ring buffer
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67 static void record_sweep(nmethod* nm, int line);
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68 static void report_events(int id, address entry);
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69 static void report_events();
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70 #endif
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71
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72 static void scan_stacks(); // Invoked at the end of each safepoint
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73 static void sweep_code_cache(); // Concurrent part of sweep job
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74 static void possibly_sweep(); // Compiler threads call this to sweep
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76 static void notify(nmethod* nm) {
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77 // Request a new sweep of the code cache from the beginning. No
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78 // need to synchronize the setting of this flag since it only
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79 // changes to false at safepoint so we can never overwrite it with false.
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80 _resweep = true;
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81 }
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82
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83 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
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84 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
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85 };
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87 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP