Mercurial > hg > truffle
annotate src/share/vm/runtime/sweeper.hpp @ 11397:956bf8c5bd8f
Fix for ReadNode.push which could cause some reads to float before the necessary checkcast.
This would cause loading non-oops as if they were oops in some rare cases.
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 22 Aug 2013 20:04:51 +0200 |
parents | f2110083203d |
children | 5888334c9c24 |
rev | line source |
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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 | |
0 | 28 // An NmethodSweeper is an incremental cleaner for: |
29 // - cleanup inline caches | |
30 // - reclamation of unreferences zombie nmethods | |
31 // | |
32 | |
33 class NMethodSweeper : public AllStatic { | |
10405 | 34 static long _traversals; // Stack scan count, also sweep ID. |
35 static nmethod* _current; // Current nmethod | |
36 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache | |
37 static int _flushed_count; // Nof. nmethods flushed in current sweep | |
38 static int _zombified_count; // Nof. nmethods made zombie in current sweep | |
39 static int _marked_count; // Nof. nmethods marked for reclaim in current sweep | |
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40 |
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41 static volatile int _invocations; // No. of invocations left until we are completed with this pass |
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42 static volatile int _sweep_started; // Flag to control conc sweeper |
0 | 43 |
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44 //The following are reset in scan_stacks and synchronized by the safepoint |
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45 static bool _resweep; // Indicates that a change has happend and we want another sweep, |
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46 // always checked and reset at a safepoint so memory will be in sync. |
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47 static int _locked_seen; // Number of locked nmethods encountered during the scan |
0 | 48 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack |
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49 static jint _flush_token; // token that guards method flushing, making sure it is executed only once. |
0 | 50 |
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51 // These are set during a flush, a VM-operation |
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52 static long _last_flush_traversal_id; // trav number at last flush unloading |
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53 static jlong _last_full_flush_time; // timestamp of last emergency unloading |
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54 |
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55 // These are synchronized by the _sweep_started token |
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56 static int _highest_marked; // highest compile id dumped at last emergency unloading |
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57 static int _dead_compile_ids; // number of compile ids that where not in the cache last flush |
0 | 58 |
10405 | 59 // Stat counters |
60 static int _number_of_flushes; // Total of full traversals caused by full cache | |
61 static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed | |
62 static jlong _total_time_sweeping; // Accumulated time sweeping | |
63 static jlong _total_time_this_sweep; // Total time this sweep | |
64 static jlong _peak_sweep_time; // Peak time for a full sweep | |
65 static jlong _peak_sweep_fraction_time; // Peak time sweeping one fraction | |
66 static jlong _total_disconnect_time; // Total time cleaning code mem | |
67 static jlong _peak_disconnect_time; // Peak time cleaning code mem | |
68 | |
0 | 69 static void process_nmethod(nmethod *nm); |
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70 static void release_nmethod(nmethod* nm); |
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71 |
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72 static void log_sweep(const char* msg, const char* format = NULL, ...); |
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73 static bool sweep_in_progress(); |
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74 |
0 | 75 public: |
10405 | 76 static long traversal_count() { return _traversals; } |
77 static int number_of_flushes() { return _number_of_flushes; } | |
78 static int total_nof_methods_reclaimed() { return _total_nof_methods_reclaimed; } | |
79 static jlong total_time_sweeping() { return _total_time_sweeping; } | |
80 static jlong peak_sweep_time() { return _peak_sweep_time; } | |
81 static jlong peak_sweep_fraction_time() { return _peak_sweep_fraction_time; } | |
82 static jlong total_disconnect_time() { return _total_disconnect_time; } | |
83 static jlong peak_disconnect_time() { return _peak_disconnect_time; } | |
0 | 84 |
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85 #ifdef ASSERT |
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86 // Keep track of sweeper activity in the ring buffer |
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87 static void record_sweep(nmethod* nm, int line); |
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88 static void report_events(int id, address entry); |
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89 static void report_events(); |
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90 #endif |
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91 |
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92 static void scan_stacks(); // Invoked at the end of each safepoint |
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93 static void sweep_code_cache(); // Concurrent part of sweep job |
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94 static void possibly_sweep(); // Compiler threads call this to sweep |
0 | 95 |
96 static void notify(nmethod* nm) { | |
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97 // Request a new sweep of the code cache from the beginning. No |
0 | 98 // need to synchronize the setting of this flag since it only |
99 // changes to false at safepoint so we can never overwrite it with false. | |
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100 _resweep = true; |
0 | 101 } |
1202 | 102 |
103 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate | |
104 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure | |
0 | 105 }; |
1972 | 106 |
107 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP |