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comparison src/share/vm/runtime/sweeper.hpp @ 10418:ff3c23a329ed

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Merge
author Christos Kotselidis <christos.kotselidis@oracle.com>
date Wed, 19 Jun 2013 20:24:27 +0200
parents f2110083203d
children 5888334c9c24
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10417:acc1c61ba408 10418:ff3c23a329ed
1 /* 1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
29 // - cleanup inline caches 29 // - cleanup inline caches
30 // - reclamation of unreferences zombie nmethods 30 // - reclamation of unreferences zombie nmethods
31 // 31 //
32 32
33 class NMethodSweeper : public AllStatic { 33 class NMethodSweeper : public AllStatic {
34 static long _traversals; // Stack traversal count 34 static long _traversals; // Stack scan count, also sweep ID.
35 static nmethod* _current; // Current nmethod 35 static nmethod* _current; // Current nmethod
36 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache 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
37 40
38 static volatile int _invocations; // No. of invocations left until we are completed with this pass 41 static volatile int _invocations; // No. of invocations left until we are completed with this pass
39 static volatile int _sweep_started; // Flag to control conc sweeper 42 static volatile int _sweep_started; // Flag to control conc sweeper
40 43
41 static bool _rescan; // Indicates that we should do a full rescan of the 44 //The following are reset in scan_stacks and synchronized by the safepoint
42 // of the code cache looking for work to do. 45 static bool _resweep; // Indicates that a change has happend and we want another sweep,
43 static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened 46 // always checked and reset at a safepoint so memory will be in sync.
44 static int _locked_seen; // Number of locked nmethods encountered during the scan 47 static int _locked_seen; // Number of locked nmethods encountered during the scan
45 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack 48 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
49 static jint _flush_token; // token that guards method flushing, making sure it is executed only once.
46 50
47 static bool _was_full; // remember if we did emergency unloading 51 // These are set during a flush, a VM-operation
48 static jint _advise_to_sweep; // flag to indicate code cache getting full 52 static long _last_flush_traversal_id; // trav number at last flush unloading
49 static jlong _last_was_full; // timestamp of last emergency unloading 53 static jlong _last_full_flush_time; // timestamp of last emergency unloading
50 static uint _highest_marked; // highest compile id dumped at last emergency unloading 54
51 static long _was_full_traversal; // trav number at last emergency unloading 55 // These are synchronized by the _sweep_started token
56 static int _highest_marked; // highest compile id dumped at last emergency unloading
57 static int _dead_compile_ids; // number of compile ids that where not in the cache last flush
58
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
52 68
53 static void process_nmethod(nmethod *nm); 69 static void process_nmethod(nmethod *nm);
54
55 static void release_nmethod(nmethod* nm); 70 static void release_nmethod(nmethod* nm);
56 71
57 static void log_sweep(const char* msg, const char* format = NULL, ...); 72 static void log_sweep(const char* msg, const char* format = NULL, ...);
73 static bool sweep_in_progress();
58 74
59 public: 75 public:
60 static long traversal_count() { return _traversals; } 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; }
61 84
62 #ifdef ASSERT 85 #ifdef ASSERT
63 // Keep track of sweeper activity in the ring buffer 86 // Keep track of sweeper activity in the ring buffer
64 static void record_sweep(nmethod* nm, int line); 87 static void record_sweep(nmethod* nm, int line);
65 static void report_events(int id, address entry); 88 static void report_events(int id, address entry);
69 static void scan_stacks(); // Invoked at the end of each safepoint 92 static void scan_stacks(); // Invoked at the end of each safepoint
70 static void sweep_code_cache(); // Concurrent part of sweep job 93 static void sweep_code_cache(); // Concurrent part of sweep job
71 static void possibly_sweep(); // Compiler threads call this to sweep 94 static void possibly_sweep(); // Compiler threads call this to sweep
72 95
73 static void notify(nmethod* nm) { 96 static void notify(nmethod* nm) {
74 // Perform a full scan of the code cache from the beginning. No 97 // Request a new sweep of the code cache from the beginning. No
75 // need to synchronize the setting of this flag since it only 98 // need to synchronize the setting of this flag since it only
76 // changes to false at safepoint so we can never overwrite it with false. 99 // changes to false at safepoint so we can never overwrite it with false.
77 _rescan = true; 100 _resweep = true;
78 } 101 }
79 102
80 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate 103 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
81 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure 104 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
82
83 static void set_was_full(bool state) { _was_full = state; }
84 static bool was_full() { return _was_full; }
85 }; 105 };
86 106
87 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP 107 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP