342
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1 /*
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2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // The Concurrent ZF Thread. Performs concurrent zero-filling.
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26
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27 class ConcurrentZFThread: public ConcurrentGCThread {
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28 friend class VMStructs;
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29 friend class ZeroFillRegionClosure;
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30
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31 private:
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32
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33 // Zero fill the heap region.
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34 void processHeapRegion(HeapRegion* r);
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35
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36 // Stats
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37 // Allocation (protected by heap lock).
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38 static int _region_allocs; // Number of regions allocated
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39 static int _sync_zfs; // Synchronous zero-fills +
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40 static int _zf_waits; // Wait for conc zero-fill completion.
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41
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42 // Number of regions CFZ thread fills.
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43 static int _regions_filled;
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44
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45 COTracker _co_tracker;
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46
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47 double _vtime_start; // Initial virtual time.
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48
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49 // These are static because the "print_summary_info" method is, and
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50 // it currently assumes there is only one ZF thread. We'll change when
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51 // we need to.
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52 static double _vtime_accum; // Initial virtual time.
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53 static double vtime_accum() { return _vtime_accum; }
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54
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55 // Offer yield for GC. Returns true if yield occurred.
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56 bool offer_yield();
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57
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58 public:
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59 // Constructor
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60 ConcurrentZFThread();
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61
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62 // Main loop.
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63 virtual void run();
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64
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65 // Printing
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66 void print();
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67
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68 // Waits until "r" has been zero-filled. Requires caller to hold the
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69 // ZF_mon.
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70 static void wait_for_ZF_completed(HeapRegion* r);
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71
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72 // Get or clear the current unclean region. Should be done
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73 // while holding the ZF_needed_mon lock.
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74
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75 // shutdown
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76 static void stop();
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77
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78 // Stats
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79 static void note_region_alloc() {_region_allocs++; }
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80 static void note_sync_zfs() { _sync_zfs++; }
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81 static void note_zf_wait() { _zf_waits++; }
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82 static void note_region_filled() { _regions_filled++; }
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83
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84 static void print_summary_info();
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85 };
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