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comparison src/share/vm/gc_implementation/g1/heapRegionSets.cpp @ 2152:0fa27f37d4d4

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6977804: G1: remove the zero-filling thread Summary: This changeset removes the zero-filling thread from G1 and collapses the two free region lists we had before (the "free" and "unclean" lists) into one. The new free list uses the new heap region sets / lists abstractions that we'll ultimately use it to keep track of all regions in the heap. A heap region set was also introduced for the humongous regions. Finally, this change increases the concurrency between the thread that completes freeing regions (after a cleanup pause) and the rest of the system (before we'd have to wait for said thread to complete before allocating a new region). The changest also includes a lot of refactoring and code simplification. Reviewed-by: jcoomes, johnc
author tonyp
date Wed, 19 Jan 2011 19:30:42 -0500
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children 1216415d8e35
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2151:cb913d743d09 2152:0fa27f37d4d4
1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc_implementation/g1/heapRegionSets.hpp"
27
28 //////////////////// FreeRegionList ////////////////////
29
30 const char* FreeRegionList::verify_region_extra(HeapRegion* hr) {
31 if (hr->is_young()) {
32 return "the region should not be young";
33 }
34 // The superclass will check that the region is empty and
35 // not-humongous.
36 return HeapRegionLinkedList::verify_region_extra(hr);
37 }
38
39 //////////////////// MasterFreeRegionList ////////////////////
40
41 bool MasterFreeRegionList::check_mt_safety() {
42 // Master Free List MT safety protocol:
43 // (a) If we're at a safepoint, operations on the master free list
44 // should be invoked by either the VM thread (which will serialize
45 // them) or by the GC workers while holding the
46 // FreeList_lock.
47 // (b) If we're not at a safepoint, operations on the master free
48 // list should be invoked while holding the Heap_lock.
49
50 guarantee((SafepointSynchronize::is_at_safepoint() &&
51 (Thread::current()->is_VM_thread() ||
52 FreeList_lock->owned_by_self())) ||
53 (!SafepointSynchronize::is_at_safepoint() &&
54 Heap_lock->owned_by_self()),
55 hrl_ext_msg(this, "master free list MT safety protocol"));
56
57 return FreeRegionList::check_mt_safety();
58 }
59
60 //////////////////// SecondaryFreeRegionList ////////////////////
61
62 bool SecondaryFreeRegionList::check_mt_safety() {
63 // Secondary Free List MT safety protocol:
64 // Operations on the secondary free list should always be invoked
65 // while holding the SecondaryFreeList_lock.
66
67 guarantee(SecondaryFreeList_lock->owned_by_self(),
68 hrl_ext_msg(this, "secondary free list MT safety protocol"));
69
70 return FreeRegionList::check_mt_safety();
71 }
72
73 //////////////////// HumongousRegionSet ////////////////////
74
75 const char* HumongousRegionSet::verify_region_extra(HeapRegion* hr) {
76 if (hr->is_young()) {
77 return "the region should not be young";
78 }
79 // The superclass will check that the region is not empty and
80 // humongous.
81 return HeapRegionSet::verify_region_extra(hr);
82 }
83
84 //////////////////// HumongousRegionSet ////////////////////
85
86 bool MasterHumongousRegionSet::check_mt_safety() {
87 // Master Humongous Set MT safety protocol:
88 // (a) If we're at a safepoint, operations on the master humongous
89 // set should be invoked by either the VM thread (which will
90 // serialize them) or by the GC workers while holding the
91 // OldSets_lock.
92 // (b) If we're not at a safepoint, operations on the master
93 // humongous set should be invoked while holding the Heap_lock.
94
95 guarantee((SafepointSynchronize::is_at_safepoint() &&
96 (Thread::current()->is_VM_thread() ||
97 OldSets_lock->owned_by_self())) ||
98 (!SafepointSynchronize::is_at_safepoint() &&
99 Heap_lock->owned_by_self()),
100 hrl_ext_msg(this, "master humongous set MT safety protocol"));
101 return HumongousRegionSet::check_mt_safety();
102 }