51 // nmethod's space is freed. Sweeping is currently done by compiler threads between |
51 // nmethod's space is freed. Sweeping is currently done by compiler threads between |
52 // compilations or at least each 5 sec (NmethodSweepCheckInterval) when the code cache |
52 // compilations or at least each 5 sec (NmethodSweepCheckInterval) when the code cache |
53 // is full. |
53 // is full. |
54 |
54 |
55 class NMethodSweeper : public AllStatic { |
55 class NMethodSweeper : public AllStatic { |
56 static long _traversals; // Stack scan count, also sweep ID. |
56 static long _traversals; // Stack scan count, also sweep ID. |
57 static nmethod* _current; // Current nmethod |
57 static long _time_counter; // Virtual time used to periodically invoke sweeper |
58 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache |
58 static long _last_sweep; // Value of _time_counter when the last sweep happened |
59 static int _flushed_count; // Nof. nmethods flushed in current sweep |
59 static nmethod* _current; // Current nmethod |
60 static int _zombified_count; // Nof. nmethods made zombie in current sweep |
60 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache |
61 static int _marked_count; // Nof. nmethods marked for reclaim in current sweep |
61 static int _flushed_count; // Nof. nmethods flushed in current sweep |
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62 static int _zombified_count; // Nof. nmethods made zombie in current sweep |
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63 static int _marked_for_reclamation_count; // Nof. nmethods marked for reclaim in current sweep |
62 |
64 |
63 static volatile int _invocations; // No. of invocations left until we are completed with this pass |
65 static volatile int _sweep_fractions_left; // Nof. invocations left until we are completed with this pass |
64 static volatile int _sweep_started; // Flag to control conc sweeper |
66 static volatile int _sweep_started; // Flag to control conc sweeper |
65 |
67 static volatile bool _should_sweep; // Indicates if we should invoke the sweeper |
66 //The following are reset in mark_active_nmethods and synchronized by the safepoint |
68 static volatile int _bytes_changed; // Counts the total nmethod size if the nmethod changed from: |
67 static bool _request_mark_phase; // Indicates that a change has happend and we need another mark pahse, |
69 // 1) alive -> not_entrant |
68 // always checked and reset at a safepoint so memory will be in sync. |
70 // 2) not_entrant -> zombie |
69 static int _locked_seen; // Number of locked nmethods encountered during the scan |
71 // 3) zombie -> marked_for_reclamation |
70 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack |
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71 |
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72 // Stat counters |
72 // Stat counters |
73 static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed |
73 static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed |
74 static jlong _total_time_sweeping; // Accumulated time sweeping |
74 static jlong _total_time_sweeping; // Accumulated time sweeping |
75 static jlong _total_time_this_sweep; // Total time this sweep |
75 static jlong _total_time_this_sweep; // Total time this sweep |
76 static jlong _peak_sweep_time; // Peak time for a full sweep |
76 static jlong _peak_sweep_time; // Peak time for a full sweep |
79 static int process_nmethod(nmethod *nm); |
79 static int process_nmethod(nmethod *nm); |
80 static void release_nmethod(nmethod* nm); |
80 static void release_nmethod(nmethod* nm); |
81 |
81 |
82 static bool sweep_in_progress(); |
82 static bool sweep_in_progress(); |
83 static void sweep_code_cache(); |
83 static void sweep_code_cache(); |
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 |
84 |
88 static int _hotness_counter_reset_val; |
85 static int _hotness_counter_reset_val; |
89 |
86 |
90 public: |
87 public: |
91 static long traversal_count() { return _traversals; } |
88 static long traversal_count() { return _traversals; } |
107 static void mark_active_nmethods(); // Invoked at the end of each safepoint |
104 static void mark_active_nmethods(); // Invoked at the end of each safepoint |
108 static void possibly_sweep(); // Compiler threads call this to sweep |
105 static void possibly_sweep(); // Compiler threads call this to sweep |
109 |
106 |
110 static int sort_nmethods_by_hotness(nmethod** nm1, nmethod** nm2); |
107 static int sort_nmethods_by_hotness(nmethod** nm1, nmethod** nm2); |
111 static int hotness_counter_reset_val(); |
108 static int hotness_counter_reset_val(); |
112 |
109 static void report_state_change(nmethod* nm); |
113 static void notify() { |
110 static void possibly_enable_sweeper(); |
114 // Request a new sweep of the code cache from the beginning. No |
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115 // need to synchronize the setting of this flag since it only |
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116 // changes to false at safepoint so we can never overwrite it with false. |
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117 request_nmethod_marking(); |
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118 } |
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119 }; |
111 }; |
120 |
112 |
121 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP |
113 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP |