1 /*
2 * Copyright (c) 2001, 2012, 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 *
49 DoDirtySync = 2,
50 LastSync = 3,
51
52 SeqTask = 0,
53 NumSeqTasks = 1
54 };
55
56 CardTableModRefBS* _ct_bs;
57 SubTasksDone* _seq_task;
58 G1CollectorPolicy* _g1p;
59
60 ConcurrentG1Refine* _cg1r;
61
62 size_t* _cards_scanned;
63 size_t _total_cards_scanned;
64
65 // Used for caching the closure that is responsible for scanning
66 // references into the collection set.
67 OopsInHeapRegionClosure** _cset_rs_update_cl;
68
69 // The routine that performs the actual work of refining a dirty
70 // card.
71 // If check_for_refs_into_refs is true then a true result is returned
72 // if the card contains oops that have references into the current
73 // collection set.
74 bool concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i,
75 bool check_for_refs_into_cset);
76
77 public:
78 // This is called to reset dual hash tables after the gc pause
79 // is finished and the initial hash table is no longer being
80 // scanned.
81 void cleanupHRRS();
82
83 G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs);
84 ~G1RemSet();
85
86 // Invoke "blk->do_oop" on all pointers into the CS in objects in regions
87 // outside the CS (having invoked "blk->set_region" to set the "from"
88 // region correctly beforehand.) The "worker_i" param is for the
89 // parallel case where the number of the worker thread calling this
90 // function can be helpful in partitioning the work to be done. It
91 // should be the same as the "i" passed to the calling thread's
92 // work(i) function. In the sequential case this param will be ingored.
93 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk,
94 int worker_i);
95
96 // Prepare for and cleanup after an oops_into_collection_set_do
97 // call. Must call each of these once before and after (in sequential
98 // code) any threads call oops_into_collection_set_do. (This offers an
99 // opportunity to sequential setup and teardown of structures needed by a
100 // parallel iteration over the CS's RS.)
101 void prepare_for_oops_into_collection_set_do();
102 void cleanup_after_oops_into_collection_set_do();
103
104 void scanRS(OopsInHeapRegionClosure* oc, int worker_i);
105 void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i);
106
107 CardTableModRefBS* ct_bs() { return _ct_bs; }
108 size_t cardsScanned() { return _total_cards_scanned; }
109
110 // Record, if necessary, the fact that *p (where "p" is in region "from",
111 // which is required to be non-NULL) has changed to a new non-NULL value.
112 template <class T> void write_ref(HeapRegion* from, T* p);
113 template <class T> void par_write_ref(HeapRegion* from, T* p, int tid);
114
115 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
116 // or card, respectively, such that a region or card with a corresponding
117 // 0 bit contains no part of any live object. Eliminates any remembered
118 // set entries that correspond to dead heap ranges.
119 void scrub(BitMap* region_bm, BitMap* card_bm);
120
121 // Like the above, but assumes is called in parallel: "worker_num" is the
122 // parallel thread id of the current thread, and "claim_val" is the
123 // value that should be used to claim heap regions.
124 void scrub_par(BitMap* region_bm, BitMap* card_bm,
125 uint worker_num, int claim_val);
126
127 // Refine the card corresponding to "card_ptr". If "sts" is non-NULL,
128 // join and leave around parts that must be atomic wrt GC. (NULL means
129 // being done at a safepoint.)
130 // If check_for_refs_into_cset is true, a true result is returned
131 // if the given card contains oops that have references into the
132 // current collection set.
133 virtual bool concurrentRefineOneCard(jbyte* card_ptr, int worker_i,
134 bool check_for_refs_into_cset);
135
136 // Print any relevant summary info.
137 virtual void print_summary_info();
138
139 // Prepare remembered set for verification.
140 virtual void prepare_for_verify();
141 };
142
143 class CountNonCleanMemRegionClosure: public MemRegionClosure {
144 G1CollectedHeap* _g1;
145 int _n;
146 HeapWord* _start_first;
147 public:
148 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) :
149 _g1(g1), _n(0), _start_first(NULL)
150 {}
151 void do_MemRegion(MemRegion mr);
152 int n() { return _n; };
153 HeapWord* start_first() { return _start_first; }
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1 /*
2 * Copyright (c) 2001, 2013, 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 *
49 DoDirtySync = 2,
50 LastSync = 3,
51
52 SeqTask = 0,
53 NumSeqTasks = 1
54 };
55
56 CardTableModRefBS* _ct_bs;
57 SubTasksDone* _seq_task;
58 G1CollectorPolicy* _g1p;
59
60 ConcurrentG1Refine* _cg1r;
61
62 size_t* _cards_scanned;
63 size_t _total_cards_scanned;
64
65 // Used for caching the closure that is responsible for scanning
66 // references into the collection set.
67 OopsInHeapRegionClosure** _cset_rs_update_cl;
68
69 public:
70 // This is called to reset dual hash tables after the gc pause
71 // is finished and the initial hash table is no longer being
72 // scanned.
73 void cleanupHRRS();
74
75 G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs);
76 ~G1RemSet();
77
78 // Invoke "blk->do_oop" on all pointers into the CS in objects in regions
79 // outside the CS (having invoked "blk->set_region" to set the "from"
80 // region correctly beforehand.) The "worker_i" param is for the
81 // parallel case where the number of the worker thread calling this
82 // function can be helpful in partitioning the work to be done. It
83 // should be the same as the "i" passed to the calling thread's
84 // work(i) function. In the sequential case this param will be ingored.
85 void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, int worker_i);
86
87 // Prepare for and cleanup after an oops_into_collection_set_do
88 // call. Must call each of these once before and after (in sequential
89 // code) any threads call oops_into_collection_set_do. (This offers an
90 // opportunity to sequential setup and teardown of structures needed by a
91 // parallel iteration over the CS's RS.)
92 void prepare_for_oops_into_collection_set_do();
93 void cleanup_after_oops_into_collection_set_do();
94
95 void scanRS(OopsInHeapRegionClosure* oc, int worker_i);
96 void updateRS(DirtyCardQueue* into_cset_dcq, int worker_i);
97
98 CardTableModRefBS* ct_bs() { return _ct_bs; }
99 size_t cardsScanned() { return _total_cards_scanned; }
100
101 // Record, if necessary, the fact that *p (where "p" is in region "from",
102 // which is required to be non-NULL) has changed to a new non-NULL value.
103 template <class T> void write_ref(HeapRegion* from, T* p);
104 template <class T> void par_write_ref(HeapRegion* from, T* p, int tid);
105
106 // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
107 // or card, respectively, such that a region or card with a corresponding
108 // 0 bit contains no part of any live object. Eliminates any remembered
109 // set entries that correspond to dead heap ranges.
110 void scrub(BitMap* region_bm, BitMap* card_bm);
111
112 // Like the above, but assumes is called in parallel: "worker_num" is the
113 // parallel thread id of the current thread, and "claim_val" is the
114 // value that should be used to claim heap regions.
115 void scrub_par(BitMap* region_bm, BitMap* card_bm,
116 uint worker_num, int claim_val);
117
118 // Refine the card corresponding to "card_ptr".
119 // If check_for_refs_into_cset is true, a true result is returned
120 // if the given card contains oops that have references into the
121 // current collection set.
122 virtual bool refine_card(jbyte* card_ptr,
123 int worker_i,
124 bool check_for_refs_into_cset);
125
126 // Print any relevant summary info.
127 virtual void print_summary_info();
128
129 // Prepare remembered set for verification.
130 virtual void prepare_for_verify();
131 };
132
133 class CountNonCleanMemRegionClosure: public MemRegionClosure {
134 G1CollectedHeap* _g1;
135 int _n;
136 HeapWord* _start_first;
137 public:
138 CountNonCleanMemRegionClosure(G1CollectedHeap* g1) :
139 _g1(g1), _n(0), _start_first(NULL)
140 {}
141 void do_MemRegion(MemRegion mr);
142 int n() { return _n; };
143 HeapWord* start_first() { return _start_first; }
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