ysr@777: /*
xdono@1279:  * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
ysr@777:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
ysr@777:  * CA 95054 USA or visit www.sun.com if you need additional information or
ysr@777:  * have any questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
ysr@777: // The Concurrent ZF Thread.  Performs concurrent zero-filling.
ysr@777: 
ysr@777: class ConcurrentZFThread: public ConcurrentGCThread {
ysr@777:   friend class VMStructs;
ysr@777:   friend class ZeroFillRegionClosure;
ysr@777: 
ysr@777:  private:
ysr@777: 
ysr@777:   // Zero fill the heap region.
ysr@777:   void processHeapRegion(HeapRegion* r);
ysr@777: 
ysr@777:   // Stats
ysr@777:   //   Allocation (protected by heap lock).
ysr@777:   static int _region_allocs;  // Number of regions allocated
ysr@777:   static int _sync_zfs;       //   Synchronous zero-fills +
ysr@777:   static int _zf_waits;      //   Wait for conc zero-fill completion.
ysr@777: 
ysr@777:   // Number of regions CFZ thread fills.
ysr@777:   static int _regions_filled;
ysr@777: 
ysr@777:   double _vtime_start;  // Initial virtual time.
ysr@777: 
ysr@777:   // These are static because the "print_summary_info" method is, and
ysr@777:   // it currently assumes there is only one ZF thread.  We'll change when
ysr@777:   // we need to.
ysr@777:   static double _vtime_accum;  // Initial virtual time.
ysr@777:   static double vtime_accum() { return _vtime_accum; }
ysr@777: 
ysr@777:   // Offer yield for GC.  Returns true if yield occurred.
ysr@777:   bool offer_yield();
ysr@777: 
ysr@777:  public:
ysr@777:   // Constructor
ysr@777:   ConcurrentZFThread();
ysr@777: 
ysr@777:   // Main loop.
ysr@777:   virtual void run();
ysr@777: 
ysr@777:   // Printing
tonyp@1454:   void print_on(outputStream* st) const;
tonyp@1454:   void print() const;
ysr@777: 
ysr@777:   // Waits until "r" has been zero-filled.  Requires caller to hold the
ysr@777:   // ZF_mon.
ysr@777:   static void wait_for_ZF_completed(HeapRegion* r);
ysr@777: 
ysr@777:   // Get or clear the current unclean region.  Should be done
ysr@777:   // while holding the ZF_needed_mon lock.
ysr@777: 
ysr@777:   // shutdown
iveresov@1229:   void stop();
ysr@777: 
ysr@777:   // Stats
ysr@777:   static void note_region_alloc() {_region_allocs++; }
ysr@777:   static void note_sync_zfs() { _sync_zfs++; }
ysr@777:   static void note_zf_wait() { _zf_waits++; }
ysr@777:   static void note_region_filled() { _regions_filled++; }
ysr@777: 
ysr@777:   static void print_summary_info();
ysr@777: };