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comparison src/share/vm/runtime/sweeper.hpp @ 13074:78da3894b86f

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8027593: performance drop with constrained codecache starting with hs25 b111 Summary: Fixed proper sweeping of small code cache sizes Reviewed-by: kvn, iveresov
author anoll
date Tue, 12 Nov 2013 09:32:50 +0100
parents 510fbd28919c
children 86e6d691f2e1
comparison
equal deleted inserted replaced
13073:1dcea64e9f00 13074:78da3894b86f
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
62 static int _zombified_count; // Nof. nmethods made zombie in current sweep
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
71
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; }
85 static void reset_nmethod_marking() { _request_mark_phase = false; }
86 static bool need_marking_phase() { return _request_mark_phase; }
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
115 // need to synchronize the setting of this flag since it only
116 // changes to false at safepoint so we can never overwrite it with false.
117 request_nmethod_marking();
118 }
119 }; 111 };
120 112
121 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP 113 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP