44 45 ConcurrentG1RefineThread** _threads; 46 uint _n_worker_threads; 47 /* 48 * The value of the update buffer queue length falls into one of 3 zones: 49 * green, yellow, red. If the value is in [0, green) nothing is 50 * done, the buffers are left unprocessed to enable the caching effect of the 51 * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement 52 * threads are gradually activated. In [yellow, red) all threads are 53 * running. If the length becomes red (max queue length) the mutators start 54 * processing the buffers. 55 * 56 * There are some interesting cases (when G1UseAdaptiveConcRefinement 57 * is turned off): 58 * 1) green = yellow = red = 0. In this case the mutator will process all 59 * buffers. Except for those that are created by the deferred updates 60 * machinery during a collection. 61 * 2) green = 0. Means no caching. Can be a good way to minimize the 62 * amount of time spent updating rsets during a collection. 63 */ 64 int _green_zone; 65 int _yellow_zone; 66 int _red_zone; 67 68 int _thread_threshold_step; 69 70 // We delay the refinement of 'hot' cards using the hot card cache. 71 G1HotCardCache _hot_card_cache; 72 73 // Reset the threshold step value based of the current zone boundaries. 74 void reset_threshold_step(); 75 76 ConcurrentG1Refine(G1CollectedHeap* g1h); 77 78 public: 79 ~ConcurrentG1Refine(); 80 81 // Returns ConcurrentG1Refine instance if succeeded to create/initialize ConcurrentG1Refine and ConcurrentG1RefineThread. 82 // Otherwise, returns NULL with error code. 83 static ConcurrentG1Refine* create(G1CollectedHeap* g1h, CardTableEntryClosure* refine_closure, jint* ecode); 84 85 void init(G1RegionToSpaceMapper* card_counts_storage); 86 void stop(); 87 88 void reinitialize_threads(); 89 90 // Iterate over all concurrent refinement threads 91 void threads_do(ThreadClosure *tc); 92 93 // Iterate over all worker refinement threads 94 void worker_threads_do(ThreadClosure * tc); 95 96 // The RS sampling thread has nothing to do with refinement, but is here for now. 97 G1YoungRemSetSamplingThread * sampling_thread() const { return _sample_thread; } 98 99 static uint thread_num(); 100 101 void print_worker_threads_on(outputStream* st) const; 102 103 void set_green_zone(int x) { _green_zone = x; } 104 void set_yellow_zone(int x) { _yellow_zone = x; } 105 void set_red_zone(int x) { _red_zone = x; } 106 107 int green_zone() const { return _green_zone; } 108 int yellow_zone() const { return _yellow_zone; } 109 int red_zone() const { return _red_zone; } 110 111 uint worker_thread_num() const { return _n_worker_threads; } 112 113 int thread_threshold_step() const { return _thread_threshold_step; } 114 115 G1HotCardCache* hot_card_cache() { return &_hot_card_cache; } 116 117 static bool hot_card_cache_enabled() { return G1HotCardCache::default_use_cache(); } 118 }; 119 120 #endif // SHARE_VM_GC_G1_CONCURRENTG1REFINE_HPP | 44 45 ConcurrentG1RefineThread** _threads; 46 uint _n_worker_threads; 47 /* 48 * The value of the update buffer queue length falls into one of 3 zones: 49 * green, yellow, red. If the value is in [0, green) nothing is 50 * done, the buffers are left unprocessed to enable the caching effect of the 51 * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement 52 * threads are gradually activated. In [yellow, red) all threads are 53 * running. If the length becomes red (max queue length) the mutators start 54 * processing the buffers. 55 * 56 * There are some interesting cases (when G1UseAdaptiveConcRefinement 57 * is turned off): 58 * 1) green = yellow = red = 0. In this case the mutator will process all 59 * buffers. Except for those that are created by the deferred updates 60 * machinery during a collection. 61 * 2) green = 0. Means no caching. Can be a good way to minimize the 62 * amount of time spent updating rsets during a collection. 63 */ 64 size_t _green_zone; 65 size_t _yellow_zone; 66 size_t _red_zone; 67 68 size_t _thread_threshold_step; 69 70 // We delay the refinement of 'hot' cards using the hot card cache. 71 G1HotCardCache _hot_card_cache; 72 73 // Reset the threshold step value based of the current zone boundaries. 74 void reset_threshold_step(); 75 76 ConcurrentG1Refine(G1CollectedHeap* g1h); 77 78 public: 79 ~ConcurrentG1Refine(); 80 81 // Returns ConcurrentG1Refine instance if succeeded to create/initialize ConcurrentG1Refine and ConcurrentG1RefineThread. 82 // Otherwise, returns NULL with error code. 83 static ConcurrentG1Refine* create(G1CollectedHeap* g1h, CardTableEntryClosure* refine_closure, jint* ecode); 84 85 void init(G1RegionToSpaceMapper* card_counts_storage); 86 void stop(); 87 88 void reinitialize_threads(); 89 90 // Iterate over all concurrent refinement threads 91 void threads_do(ThreadClosure *tc); 92 93 // Iterate over all worker refinement threads 94 void worker_threads_do(ThreadClosure * tc); 95 96 // The RS sampling thread has nothing to do with refinement, but is here for now. 97 G1YoungRemSetSamplingThread * sampling_thread() const { return _sample_thread; } 98 99 static uint thread_num(); 100 101 void print_worker_threads_on(outputStream* st) const; 102 103 void set_green_zone(size_t x) { _green_zone = x; } 104 void set_yellow_zone(size_t x) { _yellow_zone = x; } 105 void set_red_zone(size_t x) { _red_zone = x; } 106 107 size_t green_zone() const { return _green_zone; } 108 size_t yellow_zone() const { return _yellow_zone; } 109 size_t red_zone() const { return _red_zone; } 110 111 uint worker_thread_num() const { return _n_worker_threads; } 112 113 size_t thread_threshold_step() const { return _thread_threshold_step; } 114 115 G1HotCardCache* hot_card_cache() { return &_hot_card_cache; } 116 117 static bool hot_card_cache_enabled() { return G1HotCardCache::default_use_cache(); } 118 }; 119 120 #endif // SHARE_VM_GC_G1_CONCURRENTG1REFINE_HPP |