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annotate src/share/vm/runtime/sweeper.hpp @ 12888:4a2acfb16e97
8025657: compiler/intrinsics/mathexact/ConstantTest.java fails on assert in lcm.cpp on solaris x64
Reviewed-by: kvn, twisti
author | rbackman |
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date | Fri, 11 Oct 2013 12:06:14 +0200 |
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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 * | |
1552
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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 | |
0 | 28 // An NmethodSweeper is an incremental cleaner for: |
29 // - cleanup inline caches | |
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30 // - reclamation of nmethods |
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31 // Removing nmethods from the code cache includes two operations |
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32 // 1) mark active nmethods |
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33 // Is done in 'mark_active_nmethods()'. This function is called at a |
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34 // safepoint and marks all nmethods that are active on a thread's stack. |
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35 // 2) sweep nmethods |
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36 // Is done in sweep_code_cache(). This function is the only place in the |
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37 // sweeper where memory is reclaimed. Note that sweep_code_cache() is not |
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38 // called at a safepoint. However, sweep_code_cache() stops executing if |
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39 // another thread requests a safepoint. Consequently, 'mark_active_nmethods()' |
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40 // and sweep_code_cache() cannot execute at the same time. |
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41 // To reclaim memory, nmethods are first marked as 'not-entrant'. Methods can |
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42 // be made not-entrant by (i) the sweeper, (ii) deoptimization, (iii) dependency |
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43 // invalidation, and (iv) being replaced be a different method version (tiered |
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44 // compilation). Not-entrant nmethod cannot be called by Java threads, but they |
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45 // can still be active on the stack. To ensure that active nmethod are not reclaimed, |
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46 // we have to wait until the next marking phase has completed. If a not-entrant |
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47 // nmethod was NOT marked as active, it can be converted to 'zombie' state. To safely |
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48 // remove the nmethod, all inline caches (IC) that point to the the nmethod must be |
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49 // cleared. After that, the nmethod can be evicted from the code cache. Each nmethod's |
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50 // state change happens during separate sweeps. It may take at least 3 sweeps before an |
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51 // nmethod's space is freed. Sweeping is currently done by compiler threads between |
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52 // compilations or at least each 5 sec (NmethodSweepCheckInterval) when the code cache |
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53 // is full. |
0 | 54 |
55 class NMethodSweeper : public AllStatic { | |
10405 | 56 static long _traversals; // Stack scan count, also sweep ID. |
57 static nmethod* _current; // Current nmethod | |
58 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache | |
59 static int _flushed_count; // Nof. nmethods flushed in current sweep | |
60 static int _zombified_count; // Nof. nmethods made zombie in current sweep | |
61 static int _marked_count; // Nof. nmethods marked for reclaim in current sweep | |
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62 |
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63 static volatile int _invocations; // No. of invocations left until we are completed with this pass |
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64 static volatile int _sweep_started; // Flag to control conc sweeper |
0 | 65 |
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66 //The following are reset in mark_active_nmethods and synchronized by the safepoint |
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67 static bool _request_mark_phase; // Indicates that a change has happend and we need another mark pahse, |
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68 // always checked and reset at a safepoint so memory will be in sync. |
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69 static int _locked_seen; // Number of locked nmethods encountered during the scan |
0 | 70 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack |
71 | |
10405 | 72 // Stat counters |
73 static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed | |
74 static jlong _total_time_sweeping; // Accumulated time sweeping | |
75 static jlong _total_time_this_sweep; // Total time this sweep | |
76 static jlong _peak_sweep_time; // Peak time for a full sweep | |
77 static jlong _peak_sweep_fraction_time; // Peak time sweeping one fraction | |
78 | |
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79 static int process_nmethod(nmethod *nm); |
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80 static void release_nmethod(nmethod* nm); |
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81 |
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82 static bool sweep_in_progress(); |
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83 static void sweep_code_cache(); |
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84 static void request_nmethod_marking() { _request_mark_phase = true; } |
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85 static void reset_nmethod_marking() { _request_mark_phase = false; } |
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86 static bool need_marking_phase() { return _request_mark_phase; } |
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87 |
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88 static int _hotness_counter_reset_val; |
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89 |
0 | 90 public: |
10405 | 91 static long traversal_count() { return _traversals; } |
92 static int total_nof_methods_reclaimed() { return _total_nof_methods_reclaimed; } | |
93 static jlong total_time_sweeping() { return _total_time_sweeping; } | |
94 static jlong peak_sweep_time() { return _peak_sweep_time; } | |
95 static jlong peak_sweep_fraction_time() { return _peak_sweep_fraction_time; } | |
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96 static void log_sweep(const char* msg, const char* format = NULL, ...); |
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97 |
0 | 98 |
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99 #ifdef ASSERT |
12080 | 100 static bool is_sweeping(nmethod* which) { return _current == which; } |
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101 // Keep track of sweeper activity in the ring buffer |
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102 static void record_sweep(nmethod* nm, int line); |
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103 static void report_events(int id, address entry); |
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104 static void report_events(); |
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105 #endif |
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106 |
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107 static void mark_active_nmethods(); // Invoked at the end of each safepoint |
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108 static void possibly_sweep(); // Compiler threads call this to sweep |
0 | 109 |
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110 static int sort_nmethods_by_hotness(nmethod** nm1, nmethod** nm2); |
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111 static int hotness_counter_reset_val(); |
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112 |
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113 static void notify() { |
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114 // Request a new sweep of the code cache from the beginning. No |
0 | 115 // need to synchronize the setting of this flag since it only |
116 // changes to false at safepoint so we can never overwrite it with false. | |
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117 request_nmethod_marking(); |
0 | 118 } |
119 }; | |
1972 | 120 |
121 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP |