Mon, 04 Aug 2014 10:49:40 -0400
8048949: Requeue queue implementation
Summary: devirtualize flush and move calls
Reviewed-by: brutisso, tschatzl, mschoene
Contributed-by: kim.barrett@oracle.com
1 /*
2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP
28 #include "gc_implementation/g1/ptrQueue.hpp"
29 #include "memory/allocation.hpp"
31 class FreeIdSet;
33 // A closure class for processing card table entries. Note that we don't
34 // require these closure objects to be stack-allocated.
35 class CardTableEntryClosure: public CHeapObj<mtGC> {
36 public:
37 // Process the card whose card table entry is "card_ptr". If returns
38 // "false", terminate the iteration early.
39 virtual bool do_card_ptr(jbyte* card_ptr, uint worker_i = 0) = 0;
40 };
42 // A ptrQueue whose elements are "oops", pointers to object heads.
43 class DirtyCardQueue: public PtrQueue {
44 public:
45 DirtyCardQueue(PtrQueueSet* qset_, bool perm = false) :
46 // Dirty card queues are always active, so we create them with their
47 // active field set to true.
48 PtrQueue(qset_, perm, true /* active */) { }
50 // Flush before destroying; queue may be used to capture pending work while
51 // doing something else, with auto-flush on completion.
52 ~DirtyCardQueue() { if (!is_permanent()) flush(); }
54 // Process queue entries and release resources.
55 void flush() { flush_impl(); }
57 // Apply the closure to all elements, and reset the index to make the
58 // buffer empty. If a closure application returns "false", return
59 // "false" immediately, halting the iteration. If "consume" is true,
60 // deletes processed entries from logs.
61 bool apply_closure(CardTableEntryClosure* cl,
62 bool consume = true,
63 uint worker_i = 0);
65 // Apply the closure to all elements of "buf", down to "index"
66 // (inclusive.) If returns "false", then a closure application returned
67 // "false", and we return immediately. If "consume" is true, entries are
68 // set to NULL as they are processed, so they will not be processed again
69 // later.
70 static bool apply_closure_to_buffer(CardTableEntryClosure* cl,
71 void** buf, size_t index, size_t sz,
72 bool consume = true,
73 uint worker_i = 0);
74 void **get_buf() { return _buf;}
75 void set_buf(void **buf) {_buf = buf;}
76 size_t get_index() { return _index;}
77 void reinitialize() { _buf = 0; _sz = 0; _index = 0;}
78 };
82 class DirtyCardQueueSet: public PtrQueueSet {
83 CardTableEntryClosure* _closure;
85 DirtyCardQueue _shared_dirty_card_queue;
87 // Override.
88 bool mut_process_buffer(void** buf);
90 // Protected by the _cbl_mon.
91 FreeIdSet* _free_ids;
93 // The number of completed buffers processed by mutator and rs thread,
94 // respectively.
95 jint _processed_buffers_mut;
96 jint _processed_buffers_rs_thread;
98 public:
99 DirtyCardQueueSet(bool notify_when_complete = true);
101 void initialize(Monitor* cbl_mon, Mutex* fl_lock,
102 int process_completed_threshold,
103 int max_completed_queue,
104 Mutex* lock, PtrQueueSet* fl_owner = NULL);
106 // The number of parallel ids that can be claimed to allow collector or
107 // mutator threads to do card-processing work.
108 static uint num_par_ids();
110 static void handle_zero_index_for_thread(JavaThread* t);
112 // Register "blk" as "the closure" for all queues. Only one such closure
113 // is allowed. The "apply_closure_to_completed_buffer" method will apply
114 // this closure to a completed buffer, and "iterate_closure_all_threads"
115 // applies it to partially-filled buffers (the latter should only be done
116 // with the world stopped).
117 void set_closure(CardTableEntryClosure* closure);
119 // If there is a registered closure for buffers, apply it to all entries
120 // in all currently-active buffers. This should only be applied at a
121 // safepoint. (Currently must not be called in parallel; this should
122 // change in the future.) If "consume" is true, processed entries are
123 // discarded.
124 void iterate_closure_all_threads(bool consume = true,
125 uint worker_i = 0);
127 // If there exists some completed buffer, pop it, then apply the
128 // registered closure to all its elements, nulling out those elements
129 // processed. If all elements are processed, returns "true". If no
130 // completed buffers exist, returns false. If a completed buffer exists,
131 // but is only partially completed before a "yield" happens, the
132 // partially completed buffer (with its processed elements set to NULL)
133 // is returned to the completed buffer set, and this call returns false.
134 bool apply_closure_to_completed_buffer(uint worker_i = 0,
135 int stop_at = 0,
136 bool during_pause = false);
138 // If there exists some completed buffer, pop it, then apply the
139 // specified closure to all its elements, nulling out those elements
140 // processed. If all elements are processed, returns "true". If no
141 // completed buffers exist, returns false. If a completed buffer exists,
142 // but is only partially completed before a "yield" happens, the
143 // partially completed buffer (with its processed elements set to NULL)
144 // is returned to the completed buffer set, and this call returns false.
145 bool apply_closure_to_completed_buffer(CardTableEntryClosure* cl,
146 uint worker_i = 0,
147 int stop_at = 0,
148 bool during_pause = false);
150 // Helper routine for the above.
151 bool apply_closure_to_completed_buffer_helper(CardTableEntryClosure* cl,
152 uint worker_i,
153 BufferNode* nd);
155 BufferNode* get_completed_buffer(int stop_at);
157 // Applies the current closure to all completed buffers,
158 // non-consumptively.
159 void apply_closure_to_all_completed_buffers();
161 DirtyCardQueue* shared_dirty_card_queue() {
162 return &_shared_dirty_card_queue;
163 }
165 // Deallocate any completed log buffers
166 void clear();
168 // If a full collection is happening, reset partial logs, and ignore
169 // completed ones: the full collection will make them all irrelevant.
170 void abandon_logs();
172 // If any threads have partial logs, add them to the global list of logs.
173 void concatenate_logs();
174 void clear_n_completed_buffers() { _n_completed_buffers = 0;}
176 jint processed_buffers_mut() {
177 return _processed_buffers_mut;
178 }
179 jint processed_buffers_rs_thread() {
180 return _processed_buffers_rs_thread;
181 }
183 };
185 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_DIRTYCARDQUEUE_HPP