52 // nmethod's space is freed. Sweeping is currently done by compiler threads between |
52 // nmethod's space is freed. Sweeping is currently done by compiler threads between |
53 // compilations or at least each 5 sec (NmethodSweepCheckInterval) when the code cache |
53 // compilations or at least each 5 sec (NmethodSweepCheckInterval) when the code cache |
54 // is full. |
54 // is full. |
55 |
55 |
56 class NMethodSweeper : public AllStatic { |
56 class NMethodSweeper : public AllStatic { |
57 static long _traversals; // Stack scan count, also sweep ID. |
57 static long _traversals; // Stack scan count, also sweep ID. |
58 static long _time_counter; // Virtual time used to periodically invoke sweeper |
58 static long _total_nof_code_cache_sweeps; // Total number of full sweeps of the code cache |
59 static long _last_sweep; // Value of _time_counter when the last sweep happened |
59 static long _time_counter; // Virtual time used to periodically invoke sweeper |
60 static nmethod* _current; // Current nmethod |
60 static long _last_sweep; // Value of _time_counter when the last sweep happened |
61 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache |
61 static nmethod* _current; // Current nmethod |
62 static int _flushed_count; // Nof. nmethods flushed in current sweep |
62 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache |
63 static int _zombified_count; // Nof. nmethods made zombie in current sweep |
63 static int _flushed_count; // Nof. nmethods flushed in current sweep |
64 static int _marked_for_reclamation_count; // Nof. nmethods marked for reclaim in current sweep |
64 static int _zombified_count; // Nof. nmethods made zombie in current sweep |
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65 static int _marked_for_reclamation_count; // Nof. nmethods marked for reclaim in current sweep |
65 |
66 |
66 static volatile int _sweep_fractions_left; // Nof. invocations left until we are completed with this pass |
67 static volatile int _sweep_fractions_left; // Nof. invocations left until we are completed with this pass |
67 static volatile int _sweep_started; // Flag to control conc sweeper |
68 static volatile int _sweep_started; // Flag to control conc sweeper |
68 static volatile bool _should_sweep; // Indicates if we should invoke the sweeper |
69 static volatile bool _should_sweep; // Indicates if we should invoke the sweeper |
69 static volatile int _bytes_changed; // Counts the total nmethod size if the nmethod changed from: |
70 static volatile int _bytes_changed; // Counts the total nmethod size if the nmethod changed from: |
70 // 1) alive -> not_entrant |
71 // 1) alive -> not_entrant |
71 // 2) not_entrant -> zombie |
72 // 2) not_entrant -> zombie |
72 // 3) zombie -> marked_for_reclamation |
73 // 3) zombie -> marked_for_reclamation |
73 // Stat counters |
74 // Stat counters |
74 static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed |
75 static long _total_nof_methods_reclaimed; // Accumulated nof methods flushed |
75 static Tickspan _total_time_sweeping; // Accumulated time sweeping |
76 static long _total_nof_c2_methods_reclaimed; // Accumulated nof C2-compiled methods flushed |
76 static Tickspan _total_time_this_sweep; // Total time this sweep |
77 static size_t _total_flushed_size; // Total size of flushed methods |
77 static Tickspan _peak_sweep_time; // Peak time for a full sweep |
78 static int _hotness_counter_reset_val; |
78 static Tickspan _peak_sweep_fraction_time; // Peak time sweeping one fraction |
79 |
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80 static Tickspan _total_time_sweeping; // Accumulated time sweeping |
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81 static Tickspan _total_time_this_sweep; // Total time this sweep |
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82 static Tickspan _peak_sweep_time; // Peak time for a full sweep |
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83 static Tickspan _peak_sweep_fraction_time; // Peak time sweeping one fraction |
79 |
84 |
80 static int process_nmethod(nmethod *nm); |
85 static int process_nmethod(nmethod *nm); |
81 static void release_nmethod(nmethod* nm); |
86 static void release_nmethod(nmethod* nm); |
82 |
87 |
83 static bool sweep_in_progress(); |
88 static bool sweep_in_progress(); |
84 static void sweep_code_cache(); |
89 static void sweep_code_cache(); |
85 |
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86 static int _hotness_counter_reset_val; |
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87 |
90 |
88 public: |
91 public: |
89 static long traversal_count() { return _traversals; } |
92 static long traversal_count() { return _traversals; } |
90 static int total_nof_methods_reclaimed() { return _total_nof_methods_reclaimed; } |
93 static int total_nof_methods_reclaimed() { return _total_nof_methods_reclaimed; } |
91 static const Tickspan total_time_sweeping() { return _total_time_sweeping; } |
94 static const Tickspan total_time_sweeping() { return _total_time_sweeping; } |