Fri, 11 Mar 2011 16:35:18 +0100
6820066: Check that -XX:ParGCArrayScanChunk has a value larger than zero.
Summary: Check that -XX:ParGCArrayScanChunk has a value larger than zero.
Reviewed-by: johnc, jmasa, ysr
1 /*
2 * Copyright (c) 2001, 2010, 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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
28 #include "memory/cardTableModRefBS.hpp"
30 class MutableSpace;
31 class ObjectStartArray;
32 class PSPromotionManager;
33 class GCTaskQueue;
35 class CardTableExtension : public CardTableModRefBS {
36 private:
37 // Support methods for resizing the card table.
38 // resize_commit_uncommit() returns true if the pages were committed or
39 // uncommitted
40 bool resize_commit_uncommit(int changed_region, MemRegion new_region);
41 void resize_update_card_table_entries(int changed_region,
42 MemRegion new_region);
43 void resize_update_committed_table(int changed_region, MemRegion new_region);
44 void resize_update_covered_table(int changed_region, MemRegion new_region);
46 protected:
48 static void verify_all_young_refs_precise_helper(MemRegion mr);
50 public:
51 enum ExtendedCardValue {
52 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
53 verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5
54 };
56 CardTableExtension(MemRegion whole_heap, int max_covered_regions) :
57 CardTableModRefBS(whole_heap, max_covered_regions) { }
59 // Too risky for the 4/10/02 putback
60 // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }
62 // Scavenge support
63 void scavenge_contents(ObjectStartArray* start_array,
64 MutableSpace* sp,
65 HeapWord* space_top,
66 PSPromotionManager* pm);
68 void scavenge_contents_parallel(ObjectStartArray* start_array,
69 MutableSpace* sp,
70 HeapWord* space_top,
71 PSPromotionManager* pm,
72 uint stripe_number);
74 // Verification
75 static void verify_all_young_refs_imprecise();
76 static void verify_all_young_refs_precise();
78 bool addr_is_marked_imprecise(void *addr);
79 bool addr_is_marked_precise(void *addr);
81 void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; }
83 // Testers for entries
84 static bool card_is_dirty(int value) { return value == dirty_card; }
85 static bool card_is_newgen(int value) { return value == youngergen_card; }
86 static bool card_is_clean(int value) { return value == clean_card; }
87 static bool card_is_verify(int value) { return value == verify_card; }
89 // Card marking
90 void inline_write_ref_field_gc(void* field, oop new_val) {
91 jbyte* byte = byte_for(field);
92 *byte = youngergen_card;
93 }
95 // Adaptive size policy support
96 // Allows adjustment of the base and size of the covered regions
97 void resize_covered_region(MemRegion new_region);
98 // Finds the covered region to resize based on the start address
99 // of the covered regions.
100 void resize_covered_region_by_start(MemRegion new_region);
101 // Finds the covered region to resize based on the end address
102 // of the covered regions.
103 void resize_covered_region_by_end(int changed_region, MemRegion new_region);
104 // Finds the lowest start address of a covered region that is
105 // previous (i.e., lower index) to the covered region with index "ind".
106 HeapWord* lowest_prev_committed_start(int ind) const;
108 #ifdef ASSERT
110 bool is_valid_card_address(jbyte* addr) {
111 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
112 }
114 #endif // ASSERT
115 };
117 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP