Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/objectStartArray.cpp @ 5964:21595f05bc93
7146246: G1: expose some of the -XX flags that drive which old regions to collect during mixed GCs
Summary: Make two G1 cmd line flags available in product builds: G1HeapWastePercent (previously called: G1OldReclaimableThresholdPercent) and G1MixedGCCountTarget (previous called: G1MaxMixedGCNum). Also changed the default of the former from 1% to 5% and the default for G1OldCSetRegionLiveThresholdPercent to 90%.
Reviewed-by: azeemj, jwilhelm, johnc
author | tonyp |
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date | Fri, 23 Mar 2012 10:53:19 -0400 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/objectStartArray.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "memory/cardTableModRefBS.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "runtime/java.hpp" | |
0 | 31 |
32 void ObjectStartArray::initialize(MemRegion reserved_region) { | |
33 // We're based on the assumption that we use the same | |
34 // size blocks as the card table. | |
35 assert((int)block_size == (int)CardTableModRefBS::card_size, "Sanity"); | |
36 assert((int)block_size <= 512, "block_size must be less than or equal to 512"); | |
37 | |
38 // Calculate how much space must be reserved | |
39 _reserved_region = reserved_region; | |
40 | |
41 size_t bytes_to_reserve = reserved_region.word_size() / block_size_in_words; | |
42 assert(bytes_to_reserve > 0, "Sanity"); | |
43 | |
44 bytes_to_reserve = | |
45 align_size_up(bytes_to_reserve, os::vm_allocation_granularity()); | |
46 | |
47 // Do not use large-pages for the backing store. The one large page region | |
48 // will be used for the heap proper. | |
49 ReservedSpace backing_store(bytes_to_reserve); | |
50 if (!backing_store.is_reserved()) { | |
51 vm_exit_during_initialization("Could not reserve space for ObjectStartArray"); | |
52 } | |
53 | |
54 // We do not commit any memory initially | |
55 if (!_virtual_space.initialize(backing_store, 0)) { | |
56 vm_exit_during_initialization("Could not commit space for ObjectStartArray"); | |
57 } | |
58 | |
59 _raw_base = (jbyte*)_virtual_space.low_boundary(); | |
60 if (_raw_base == NULL) { | |
61 vm_exit_during_initialization("Could not get raw_base address"); | |
62 } | |
63 | |
64 _offset_base = _raw_base - (size_t(reserved_region.start()) >> block_shift); | |
65 | |
66 _covered_region.set_start(reserved_region.start()); | |
67 _covered_region.set_word_size(0); | |
68 | |
69 _blocks_region.set_start((HeapWord*)_raw_base); | |
70 _blocks_region.set_word_size(0); | |
71 } | |
72 | |
73 void ObjectStartArray::set_covered_region(MemRegion mr) { | |
74 assert(_reserved_region.contains(mr), "MemRegion outside of reserved space"); | |
75 assert(_reserved_region.start() == mr.start(), "Attempt to move covered region"); | |
76 | |
77 HeapWord* low_bound = mr.start(); | |
78 HeapWord* high_bound = mr.end(); | |
79 assert((uintptr_t(low_bound) & (block_size - 1)) == 0, "heap must start at block boundary"); | |
80 assert((uintptr_t(high_bound) & (block_size - 1)) == 0, "heap must end at block boundary"); | |
81 | |
82 size_t requested_blocks_size_in_bytes = mr.word_size() / block_size_in_words; | |
83 | |
84 // Only commit memory in page sized chunks | |
85 requested_blocks_size_in_bytes = | |
86 align_size_up(requested_blocks_size_in_bytes, os::vm_page_size()); | |
87 | |
88 _covered_region = mr; | |
89 | |
90 size_t current_blocks_size_in_bytes = _blocks_region.byte_size(); | |
91 | |
92 if (requested_blocks_size_in_bytes > current_blocks_size_in_bytes) { | |
93 // Expand | |
94 size_t expand_by = requested_blocks_size_in_bytes - current_blocks_size_in_bytes; | |
95 if (!_virtual_space.expand_by(expand_by)) { | |
96 vm_exit_out_of_memory(expand_by, "object start array expansion"); | |
97 } | |
98 // Clear *only* the newly allocated region | |
99 memset(_blocks_region.end(), clean_block, expand_by); | |
100 } | |
101 | |
102 if (requested_blocks_size_in_bytes < current_blocks_size_in_bytes) { | |
103 // Shrink | |
104 size_t shrink_by = current_blocks_size_in_bytes - requested_blocks_size_in_bytes; | |
105 _virtual_space.shrink_by(shrink_by); | |
106 } | |
107 | |
108 _blocks_region.set_word_size(requested_blocks_size_in_bytes / sizeof(HeapWord)); | |
109 | |
110 assert(requested_blocks_size_in_bytes % sizeof(HeapWord) == 0, "Block table not expanded in word sized increment"); | |
111 assert(requested_blocks_size_in_bytes == _blocks_region.byte_size(), "Sanity"); | |
112 assert(block_for_addr(low_bound) == &_raw_base[0], "Checking start of map"); | |
113 assert(block_for_addr(high_bound-1) <= &_raw_base[_blocks_region.byte_size()-1], "Checking end of map"); | |
114 } | |
115 | |
116 void ObjectStartArray::reset() { | |
117 memset(_blocks_region.start(), clean_block, _blocks_region.byte_size()); | |
118 } | |
119 | |
120 | |
121 bool ObjectStartArray::object_starts_in_range(HeapWord* start_addr, | |
122 HeapWord* end_addr) const { | |
123 assert(start_addr <= end_addr, "range is wrong"); | |
124 if (start_addr > end_addr) { | |
125 return false; | |
126 } | |
127 | |
128 jbyte* start_block = block_for_addr(start_addr); | |
129 jbyte* end_block = block_for_addr(end_addr); | |
130 | |
131 for (jbyte* block = start_block; block <= end_block; block++) { | |
132 if (*block != clean_block) { | |
133 return true; | |
134 } | |
135 } | |
136 // No object starts in this slice; verify this using | |
137 // more traditional methods: | |
138 assert(object_start(end_addr - 1) <= start_addr, | |
139 "Oops an object does start in this slice?"); | |
140 return false; | |
141 } |