Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/g1/concurrentZFThread.hpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
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date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | |
children | 315a5d70b295 |
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1 /* | |
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // The Concurrent ZF Thread. Performs concurrent zero-filling. | |
26 | |
27 class ConcurrentZFThread: public ConcurrentGCThread { | |
28 friend class VMStructs; | |
29 friend class ZeroFillRegionClosure; | |
30 | |
31 private: | |
32 | |
33 // Zero fill the heap region. | |
34 void processHeapRegion(HeapRegion* r); | |
35 | |
36 // Stats | |
37 // Allocation (protected by heap lock). | |
38 static int _region_allocs; // Number of regions allocated | |
39 static int _sync_zfs; // Synchronous zero-fills + | |
40 static int _zf_waits; // Wait for conc zero-fill completion. | |
41 | |
42 // Number of regions CFZ thread fills. | |
43 static int _regions_filled; | |
44 | |
45 COTracker _co_tracker; | |
46 | |
47 double _vtime_start; // Initial virtual time. | |
48 | |
49 // These are static because the "print_summary_info" method is, and | |
50 // it currently assumes there is only one ZF thread. We'll change when | |
51 // we need to. | |
52 static double _vtime_accum; // Initial virtual time. | |
53 static double vtime_accum() { return _vtime_accum; } | |
54 | |
55 // Offer yield for GC. Returns true if yield occurred. | |
56 bool offer_yield(); | |
57 | |
58 public: | |
59 // Constructor | |
60 ConcurrentZFThread(); | |
61 | |
62 // Main loop. | |
63 virtual void run(); | |
64 | |
65 // Printing | |
66 void print(); | |
67 | |
68 // Waits until "r" has been zero-filled. Requires caller to hold the | |
69 // ZF_mon. | |
70 static void wait_for_ZF_completed(HeapRegion* r); | |
71 | |
72 // Get or clear the current unclean region. Should be done | |
73 // while holding the ZF_needed_mon lock. | |
74 | |
75 // shutdown | |
76 static void stop(); | |
77 | |
78 // Stats | |
79 static void note_region_alloc() {_region_allocs++; } | |
80 static void note_sync_zfs() { _sync_zfs++; } | |
81 static void note_zf_wait() { _zf_waits++; } | |
82 static void note_region_filled() { _regions_filled++; } | |
83 | |
84 static void print_summary_info(); | |
85 }; |