diff -r e45861098f5a -r fec48bf5a827 hotspot/src/share/vm/gc/g1/dirtyCardQueue.hpp --- /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 { +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