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comparison src/share/vm/runtime/sweeper.hpp @ 14199:49a31fd8b93d

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8025277: Add -XX: flag to print code cache sweeper statistics Summary: New diagnostic flag prints statistics about the code cache sweeper Reviewed-by: kvn Contributed-by: tobi.hartmann@gmail.com
author anoll
date Thu, 19 Dec 2013 14:08:02 +0100
parents 86e6d691f2e1
children 4ca6dc0799b6 78bbf4d43a14
comparison
equal deleted inserted replaced
14198:b8b5791fa045 14199:49a31fd8b93d
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
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
80 static Tickspan _total_time_sweeping; // Accumulated time sweeping
81 static Tickspan _total_time_this_sweep; // Total time this sweep
82 static Tickspan _peak_sweep_time; // Peak time for a full sweep
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
86 static int _hotness_counter_reset_val;
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; }
103 #endif 106 #endif
104 107
105 static void mark_active_nmethods(); // Invoked at the end of each safepoint 108 static void mark_active_nmethods(); // Invoked at the end of each safepoint
106 static void possibly_sweep(); // Compiler threads call this to sweep 109 static void possibly_sweep(); // Compiler threads call this to sweep
107 110
108 static int sort_nmethods_by_hotness(nmethod** nm1, nmethod** nm2);
109 static int hotness_counter_reset_val(); 111 static int hotness_counter_reset_val();
110 static void report_state_change(nmethod* nm); 112 static void report_state_change(nmethod* nm);
111 static void possibly_enable_sweeper(); 113 static void possibly_enable_sweeper();
114 static void print(); // Printing/debugging
112 }; 115 };
113 116
114 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP 117 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP