Mercurial > hg > truffle
annotate src/share/vm/runtime/sweeper.hpp @ 13563:fb846424299f
Truffle/Ruby: extend Instrumentation framework with language-agnostic interfaces for access to AST printing utilities and a Ruby implementation
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Tue, 07 Jan 2014 18:09:42 -0800 |
parents | 86e6d691f2e1 |
children | 49a31fd8b93d |
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0 | 1 /* |
10405 | 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP |
26 #define SHARE_VM_RUNTIME_SWEEPER_HPP | |
27 | |
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28 #include "utilities/ticks.hpp" |
0 | 29 // An NmethodSweeper is an incremental cleaner for: |
30 // - cleanup inline caches | |
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31 // - reclamation of nmethods |
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32 // Removing nmethods from the code cache includes two operations |
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33 // 1) mark active nmethods |
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34 // Is done in 'mark_active_nmethods()'. This function is called at a |
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35 // safepoint and marks all nmethods that are active on a thread's stack. |
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36 // 2) sweep nmethods |
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37 // Is done in sweep_code_cache(). This function is the only place in the |
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38 // sweeper where memory is reclaimed. Note that sweep_code_cache() is not |
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39 // called at a safepoint. However, sweep_code_cache() stops executing if |
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40 // another thread requests a safepoint. Consequently, 'mark_active_nmethods()' |
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41 // and sweep_code_cache() cannot execute at the same time. |
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42 // To reclaim memory, nmethods are first marked as 'not-entrant'. Methods can |
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43 // be made not-entrant by (i) the sweeper, (ii) deoptimization, (iii) dependency |
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44 // invalidation, and (iv) being replaced be a different method version (tiered |
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45 // compilation). Not-entrant nmethod cannot be called by Java threads, but they |
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46 // can still be active on the stack. To ensure that active nmethod are not reclaimed, |
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47 // we have to wait until the next marking phase has completed. If a not-entrant |
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48 // nmethod was NOT marked as active, it can be converted to 'zombie' state. To safely |
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49 // remove the nmethod, all inline caches (IC) that point to the the nmethod must be |
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50 // cleared. After that, the nmethod can be evicted from the code cache. Each nmethod's |
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51 // state change happens during separate sweeps. It may take at least 3 sweeps before an |
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52 // nmethod's space is freed. Sweeping is currently done by compiler threads between |
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53 // compilations or at least each 5 sec (NmethodSweepCheckInterval) when the code cache |
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54 // is full. |
0 | 55 |
56 class NMethodSweeper : public AllStatic { | |
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57 static long _traversals; // Stack scan count, also sweep ID. |
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58 static long _time_counter; // Virtual time used to periodically invoke sweeper |
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59 static long _last_sweep; // Value of _time_counter when the last sweep happened |
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60 static nmethod* _current; // Current nmethod |
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61 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache |
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62 static int _flushed_count; // Nof. nmethods flushed in current sweep |
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63 static int _zombified_count; // Nof. nmethods made zombie in current sweep |
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64 static int _marked_for_reclamation_count; // Nof. nmethods marked for reclaim in current sweep |
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65 |
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66 static volatile int _sweep_fractions_left; // Nof. invocations left until we are completed with this pass |
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67 static volatile int _sweep_started; // Flag to control conc sweeper |
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68 static volatile bool _should_sweep; // Indicates if we should invoke the sweeper |
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69 static volatile int _bytes_changed; // Counts the total nmethod size if the nmethod changed from: |
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70 // 1) alive -> not_entrant |
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71 // 2) not_entrant -> zombie |
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72 // 3) zombie -> marked_for_reclamation |
10405 | 73 // Stat counters |
74 static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed | |
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75 static Tickspan _total_time_sweeping; // Accumulated time sweeping |
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76 static Tickspan _total_time_this_sweep; // Total time this sweep |
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77 static Tickspan _peak_sweep_time; // Peak time for a full sweep |
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78 static Tickspan _peak_sweep_fraction_time; // Peak time sweeping one fraction |
10405 | 79 |
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80 static int process_nmethod(nmethod *nm); |
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81 static void release_nmethod(nmethod* nm); |
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82 |
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83 static bool sweep_in_progress(); |
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84 static void sweep_code_cache(); |
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85 |
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86 static int _hotness_counter_reset_val; |
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87 |
0 | 88 public: |
10405 | 89 static long traversal_count() { return _traversals; } |
90 static int total_nof_methods_reclaimed() { return _total_nof_methods_reclaimed; } | |
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91 static const Tickspan total_time_sweeping() { return _total_time_sweeping; } |
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92 static const Tickspan peak_sweep_time() { return _peak_sweep_time; } |
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93 static const Tickspan peak_sweep_fraction_time() { return _peak_sweep_fraction_time; } |
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94 static void log_sweep(const char* msg, const char* format = NULL, ...); |
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95 |
0 | 96 |
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97 #ifdef ASSERT |
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99 // Keep track of sweeper activity in the ring buffer |
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100 static void record_sweep(nmethod* nm, int line); |
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101 static void report_events(int id, address entry); |
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102 static void report_events(); |
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103 #endif |
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104 |
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105 static void mark_active_nmethods(); // Invoked at the end of each safepoint |
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106 static void possibly_sweep(); // Compiler threads call this to sweep |
0 | 107 |
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108 static int sort_nmethods_by_hotness(nmethod** nm1, nmethod** nm2); |
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109 static int hotness_counter_reset_val(); |
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110 static void report_state_change(nmethod* nm); |
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111 static void possibly_enable_sweeper(); |
0 | 112 }; |
1972 | 113 |
114 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP |