| /* |
| * Copyright (c) 2001, 2010, 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_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP |
| #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP |
| |
| #include "gc_implementation/shared/concurrentGCThread.hpp" |
| |
| // The Concurrent ZF Thread. Performs concurrent zero-filling. |
| |
| class ConcurrentZFThread: public ConcurrentGCThread { |
| friend class VMStructs; |
| friend class ZeroFillRegionClosure; |
| |
| private: |
| |
| // Zero fill the heap region. |
| void processHeapRegion(HeapRegion* r); |
| |
| // Stats |
| // Allocation (protected by heap lock). |
| static int _region_allocs; // Number of regions allocated |
| static int _sync_zfs; // Synchronous zero-fills + |
| static int _zf_waits; // Wait for conc zero-fill completion. |
| |
| // Number of regions CFZ thread fills. |
| static int _regions_filled; |
| |
| double _vtime_start; // Initial virtual time. |
| |
| // These are static because the "print_summary_info" method is, and |
| // it currently assumes there is only one ZF thread. We'll change when |
| // we need to. |
| static double _vtime_accum; // Initial virtual time. |
| static double vtime_accum() { return _vtime_accum; } |
| |
| // Offer yield for GC. Returns true if yield occurred. |
| bool offer_yield(); |
| |
| public: |
| // Constructor |
| ConcurrentZFThread(); |
| |
| // Main loop. |
| virtual void run(); |
| |
| // Printing |
| void print_on(outputStream* st) const; |
| void print() const; |
| |
| // Waits until "r" has been zero-filled. Requires caller to hold the |
| // ZF_mon. |
| static void wait_for_ZF_completed(HeapRegion* r); |
| |
| // Get or clear the current unclean region. Should be done |
| // while holding the ZF_needed_mon lock. |
| |
| // shutdown |
| void stop(); |
| |
| // Stats |
| static void note_region_alloc() {_region_allocs++; } |
| static void note_sync_zfs() { _sync_zfs++; } |
| static void note_zf_wait() { _zf_waits++; } |
| static void note_region_filled() { _regions_filled++; } |
| |
| static void print_summary_info(); |
| }; |
| |
| #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP |