--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/dirtyCardQueue.hpp Wed May 13 15:16:06 2015 +0200
@@ -0,0 +1,175 @@
+/*
+ * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_G1_DIRTYCARDQUEUE_HPP
+#define SHARE_VM_GC_G1_DIRTYCARDQUEUE_HPP
+
+#include "gc/g1/ptrQueue.hpp"
+#include "memory/allocation.hpp"
+
+class FreeIdSet;
+
+// A closure class for processing card table entries. Note that we don't
+// require these closure objects to be stack-allocated.
+class CardTableEntryClosure: public CHeapObj<mtGC> {
+public:
+ // Process the card whose card table entry is "card_ptr". If returns
+ // "false", terminate the iteration early.
+ virtual bool do_card_ptr(jbyte* card_ptr, uint worker_i = 0) = 0;
+};
+
+// A ptrQueue whose elements are "oops", pointers to object heads.
+class DirtyCardQueue: public PtrQueue {
+public:
+ DirtyCardQueue(PtrQueueSet* qset_, bool perm = false) :
+ // Dirty card queues are always active, so we create them with their
+ // active field set to true.
+ PtrQueue(qset_, perm, true /* active */) { }
+
+ // Flush before destroying; queue may be used to capture pending work while
+ // doing something else, with auto-flush on completion.
+ ~DirtyCardQueue() { if (!is_permanent()) flush(); }
+
+ // Process queue entries and release resources.
+ void flush() { flush_impl(); }
+
+ // Apply the closure to all elements, and reset the index to make the
+ // buffer empty. If a closure application returns "false", return
+ // "false" immediately, halting the iteration. If "consume" is true,
+ // deletes processed entries from logs.
+ bool apply_closure(CardTableEntryClosure* cl,
+ bool consume = true,
+ uint worker_i = 0);
+
+ // Apply the closure to all elements of "buf", down to "index"
+ // (inclusive.) If returns "false", then a closure application returned
+ // "false", and we return immediately. If "consume" is true, entries are
+ // set to NULL as they are processed, so they will not be processed again
+ // later.
+ static bool apply_closure_to_buffer(CardTableEntryClosure* cl,
+ void** buf, size_t index, size_t sz,
+ bool consume = true,
+ uint worker_i = 0);
+ void **get_buf() { return _buf;}
+ void set_buf(void **buf) {_buf = buf;}
+ size_t get_index() { return _index;}
+ void reinitialize() { _buf = 0; _sz = 0; _index = 0;}
+};
+
+
+
+class DirtyCardQueueSet: public PtrQueueSet {
+ // The closure used in mut_process_buffer().
+ CardTableEntryClosure* _mut_process_closure;
+
+ DirtyCardQueue _shared_dirty_card_queue;
+
+ // Override.
+ bool mut_process_buffer(void** buf);
+
+ // Protected by the _cbl_mon.
+ FreeIdSet* _free_ids;
+
+ // The number of completed buffers processed by mutator and rs thread,
+ // respectively.
+ jint _processed_buffers_mut;
+ jint _processed_buffers_rs_thread;
+
+ // Current buffer node used for parallel iteration.
+ BufferNode* volatile _cur_par_buffer_node;
+public:
+ DirtyCardQueueSet(bool notify_when_complete = true);
+
+ void initialize(CardTableEntryClosure* cl, Monitor* cbl_mon, Mutex* fl_lock,
+ int process_completed_threshold,
+ int max_completed_queue,
+ Mutex* lock, PtrQueueSet* fl_owner = NULL);
+
+ // The number of parallel ids that can be claimed to allow collector or
+ // mutator threads to do card-processing work.
+ static uint num_par_ids();
+
+ static void handle_zero_index_for_thread(JavaThread* t);
+
+ // Apply the given closure to all entries in all currently-active buffers.
+ // This should only be applied at a safepoint. (Currently must not be called
+ // in parallel; this should change in the future.) If "consume" is true,
+ // processed entries are discarded.
+ void iterate_closure_all_threads(CardTableEntryClosure* cl,
+ bool consume = true,
+ uint worker_i = 0);
+
+ // If there exists some completed buffer, pop it, then apply the
+ // specified closure to all its elements, nulling out those elements
+ // processed. If all elements are processed, returns "true". If no
+ // completed buffers exist, returns false. If a completed buffer exists,
+ // but is only partially completed before a "yield" happens, the
+ // partially completed buffer (with its processed elements set to NULL)
+ // is returned to the completed buffer set, and this call returns false.
+ bool apply_closure_to_completed_buffer(CardTableEntryClosure* cl,
+ uint worker_i = 0,
+ int stop_at = 0,
+ bool during_pause = false);
+
+ // Helper routine for the above.
+ bool apply_closure_to_completed_buffer_helper(CardTableEntryClosure* cl,
+ uint worker_i,
+ BufferNode* nd);
+
+ BufferNode* get_completed_buffer(int stop_at);
+
+ // Applies the current closure to all completed buffers,
+ // non-consumptively.
+ void apply_closure_to_all_completed_buffers(CardTableEntryClosure* cl);
+
+ void reset_for_par_iteration() { _cur_par_buffer_node = _completed_buffers_head; }
+ // Applies the current closure to all completed buffers, non-consumptively.
+ // Parallel version.
+ void par_apply_closure_to_all_completed_buffers(CardTableEntryClosure* cl);
+
+ DirtyCardQueue* shared_dirty_card_queue() {
+ return &_shared_dirty_card_queue;
+ }
+
+ // Deallocate any completed log buffers
+ void clear();
+
+ // If a full collection is happening, reset partial logs, and ignore
+ // completed ones: the full collection will make them all irrelevant.
+ void abandon_logs();
+
+ // If any threads have partial logs, add them to the global list of logs.
+ void concatenate_logs();
+ void clear_n_completed_buffers() { _n_completed_buffers = 0;}
+
+ jint processed_buffers_mut() {
+ return _processed_buffers_mut;
+ }
+ jint processed_buffers_rs_thread() {
+ return _processed_buffers_rs_thread;
+ }
+
+};
+
+#endif // SHARE_VM_GC_G1_DIRTYCARDQUEUE_HPP