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src/hotspot/share/gc/shenandoah/shenandoahControlThread.hpp

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 40 class ShenandoahPeriodicTask : public PeriodicTask {
 41 private:
 42   ShenandoahControlThread* _thread;
 43 public:
 44   ShenandoahPeriodicTask(ShenandoahControlThread* thread) :
 45           PeriodicTask(100), _thread(thread) {}
 46   virtual void task();
 47 };
 48 
 49 // Periodic task to notify blocked paced waiters.
 50 class ShenandoahPeriodicPacerNotify : public PeriodicTask {
 51 public:
 52   ShenandoahPeriodicPacerNotify() : PeriodicTask(PeriodicTask::min_interval) {}
 53   virtual void task();
 54 };
 55 
 56 class ShenandoahControlThread: public ConcurrentGCThread {
 57   friend class VMStructs;
 58 
 59 private:
 60   typedef enum {
 61     none,
 62     concurrent_normal,
 63     stw_degenerated,
 64     stw_full
 65   } GCMode;
 66 
 67   // While we could have a single lock for these, it may risk unblocking
 68   // GC waiters when alloc failure GC cycle finishes. We want instead
 69   // to make complete explicit cycle for for demanding customers.
 70   Monitor _alloc_failure_waiters_lock;
 71   Monitor _gc_waiters_lock;


 72   ShenandoahPeriodicTask _periodic_task;
 73   ShenandoahPeriodicPacerNotify _periodic_pacer_notify_task;
 74 
 75 public:








 76   void run_service();
 77   void stop_service();
 78 


 79 private:


 80   ShenandoahSharedFlag _gc_requested;
 81   ShenandoahSharedFlag _alloc_failure_gc;
 82   ShenandoahSharedFlag _graceful_shutdown;
 83   ShenandoahSharedFlag _heap_changed;
 84   ShenandoahSharedFlag _do_counters_update;
 85   ShenandoahSharedFlag _force_counters_update;
 86   GCCause::Cause       _requested_gc_cause;

 87   ShenandoahGC::ShenandoahDegenPoint _degen_point;

 88 
 89   shenandoah_padding(0);
 90   volatile size_t _allocs_seen;
 91   shenandoah_padding(1);
 92   volatile size_t _gc_id;
 93   shenandoah_padding(2);


 94 
 95   bool check_cancellation_or_degen(ShenandoahGC::ShenandoahDegenPoint point);
 96   void service_concurrent_normal_cycle(GCCause::Cause cause);

 97   void service_stw_full_cycle(GCCause::Cause cause);
 98   void service_stw_degenerated_cycle(GCCause::Cause cause, ShenandoahGC::ShenandoahDegenPoint point);



 99   void service_uncommit(double shrink_before, size_t shrink_until);
100 
101   bool try_set_alloc_failure_gc();
102   void notify_alloc_failure_waiters();
103   bool is_alloc_failure_gc();
104 
105   void reset_gc_id();
106   void update_gc_id();
107   size_t get_gc_id();
108 
109   void notify_gc_waiters();
110 
111   // Handle GC request.
112   // Blocks until GC is over.
113   void handle_requested_gc(GCCause::Cause cause);
114 
115   bool is_explicit_gc(GCCause::Cause cause) const;



116 
117   bool check_soft_max_changed() const;
118 


119 public:
120   // Constructor
121   ShenandoahControlThread();
122   ~ShenandoahControlThread();
123 
124   // Handle allocation failure from normal allocation.
125   // Blocks until memory is available.
126   void handle_alloc_failure(ShenandoahAllocRequest& req);
127 
128   // Handle allocation failure from evacuation path.
129   // Optionally blocks while collector is handling the failure.
130   void handle_alloc_failure_evac(size_t words);
131 
132   void request_gc(GCCause::Cause cause);

133 
134   void handle_counters_update();
135   void handle_force_counters_update();
136   void set_forced_counters_update(bool value);
137 
138   void notify_heap_changed();
139 
140   void pacing_notify_alloc(size_t words);
141 
142   void start();
143   void prepare_for_graceful_shutdown();
144   bool in_graceful_shutdown();
145 
146   const char* name() const { return "ShenandoahControlThread";}
147 
148   // Printing
149   void print_on(outputStream* st) const;
150   void print() const;
















151 };
152 
153 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCONTROLTHREAD_HPP

 40 class ShenandoahPeriodicTask : public PeriodicTask {
 41 private:
 42   ShenandoahControlThread* _thread;
 43 public:
 44   ShenandoahPeriodicTask(ShenandoahControlThread* thread) :
 45           PeriodicTask(100), _thread(thread) {}
 46   virtual void task();
 47 };
 48 
 49 // Periodic task to notify blocked paced waiters.
 50 class ShenandoahPeriodicPacerNotify : public PeriodicTask {
 51 public:
 52   ShenandoahPeriodicPacerNotify() : PeriodicTask(PeriodicTask::min_interval) {}
 53   virtual void task();
 54 };
 55 
 56 class ShenandoahControlThread: public ConcurrentGCThread {
 57   friend class VMStructs;
 58 
 59 private:







 60   // While we could have a single lock for these, it may risk unblocking
 61   // GC waiters when alloc failure GC cycle finishes. We want instead
 62   // to make complete explicit cycle for demanding customers.
 63   Monitor _alloc_failure_waiters_lock;
 64   Monitor _gc_waiters_lock;
 65   Monitor _control_lock;
 66   Monitor _regulator_lock;
 67   ShenandoahPeriodicTask _periodic_task;
 68   ShenandoahPeriodicPacerNotify _periodic_pacer_notify_task;
 69 
 70 public:
 71   typedef enum {
 72     none,
 73     concurrent_normal,
 74     stw_degenerated,
 75     stw_full,
 76     marking_old
 77   } GCMode;
 78 
 79   void run_service();
 80   void stop_service();
 81 
 82   size_t get_gc_id();
 83 
 84 private:
 85   ShenandoahSharedFlag _allow_old_preemption;
 86   ShenandoahSharedFlag _preemption_requested;
 87   ShenandoahSharedFlag _gc_requested;
 88   ShenandoahSharedFlag _alloc_failure_gc;
 89   ShenandoahSharedFlag _graceful_shutdown;

 90   ShenandoahSharedFlag _do_counters_update;
 91   ShenandoahSharedFlag _force_counters_update;
 92   GCCause::Cause       _requested_gc_cause;
 93   GenerationMode       _requested_generation;
 94   ShenandoahGC::ShenandoahDegenPoint _degen_point;
 95   ShenandoahGeneration* _degen_generation;
 96 
 97   shenandoah_padding(0);
 98   volatile size_t _allocs_seen;
 99   shenandoah_padding(1);
100   volatile size_t _gc_id;
101   shenandoah_padding(2);
102   volatile GCMode _mode;
103   shenandoah_padding(3);
104 
105   bool check_cancellation_or_degen(ShenandoahGC::ShenandoahDegenPoint point);
106   void resume_concurrent_old_cycle(ShenandoahGeneration* generation, GCCause::Cause cause);
107   void service_concurrent_cycle(ShenandoahGeneration* generation, GCCause::Cause cause, bool reset_old_bitmap_specially);
108   void service_stw_full_cycle(GCCause::Cause cause);
109 
110   // Return true if degenerated cycle finishes normally.  Return false if the degenerated cycle transformed itself
111   // into a full GC.
112   bool service_stw_degenerated_cycle(GCCause::Cause cause, ShenandoahGC::ShenandoahDegenPoint point);
113   void service_uncommit(double shrink_before, size_t shrink_until);
114 
115   bool try_set_alloc_failure_gc();
116   void notify_alloc_failure_waiters();
117   bool is_alloc_failure_gc();
118 
119   void reset_gc_id();
120   void update_gc_id();

121 
122   void notify_gc_waiters();
123 
124   // Handle GC request.
125   // Blocks until GC is over.
126   void handle_requested_gc(GCCause::Cause cause);
127 
128   bool is_explicit_gc(GCCause::Cause cause) const;
129   bool is_implicit_gc(GCCause::Cause cause) const;
130 
131   bool preempt_old_marking(GenerationMode generation);
132 
133   bool check_soft_max_changed() const;
134 
135   void process_phase_timings(const ShenandoahHeap* heap);
136 
137 public:
138   // Constructor
139   ShenandoahControlThread();
140   ~ShenandoahControlThread();
141 
142   // Handle allocation failure from normal allocation.
143   // Blocks until memory is available.
144   void handle_alloc_failure(ShenandoahAllocRequest& req);
145 
146   // Handle allocation failure from evacuation path.
147   // Optionally blocks while collector is handling the failure.
148   void handle_alloc_failure_evac(size_t words);
149 
150   void request_gc(GCCause::Cause cause);
151   bool request_concurrent_gc(GenerationMode generation);
152 
153   void handle_counters_update();
154   void handle_force_counters_update();
155   void set_forced_counters_update(bool value);
156 
157   void notify_heap_changed();
158 
159   void pacing_notify_alloc(size_t words);
160 
161   void start();
162   void prepare_for_graceful_shutdown();
163   bool in_graceful_shutdown();
164 
165   const char* name() const { return "ShenandoahControlThread";}
166 
167   // Printing
168   void print_on(outputStream* st) const;
169   void print() const;
170 
171   void service_concurrent_normal_cycle(const ShenandoahHeap* heap,
172                                        const GenerationMode generation,
173                                        GCCause::Cause cause);
174 
175   void service_concurrent_old_cycle(const ShenandoahHeap* heap,
176                                     GCCause::Cause &cause);
177 
178   void set_gc_mode(GCMode new_mode);
179   GCMode gc_mode() {
180     return _mode;
181   }
182 
183  private:
184   static const char* gc_mode_name(GCMode mode);
185   void notify_control_thread();
186 };
187 
188 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHCONTROLTHREAD_HPP
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