Thu, 21 Aug 2014 16:44:41 +0200
8055098: WB API should be extended to provide information about size and age of object.
Summary: Extend the WhiteBox API to provide information about the size and age of objects. Further add a mechanism to trigger a young GC.
Reviewed-by: tschatzl, sjohanss
Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
ysr@777 | 1 | /* |
stefank@6969 | 2 | * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
stefank@2314 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |
stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |
stefank@2314 | 27 | |
tschatzl@5204 | 28 | #include "gc_implementation/g1/g1RemSetSummary.hpp" |
tschatzl@5204 | 29 | |
ysr@777 | 30 | // A G1RemSet provides ways of iterating over pointers into a selected |
ysr@777 | 31 | // collection set. |
ysr@777 | 32 | |
ysr@777 | 33 | class G1CollectedHeap; |
ysr@777 | 34 | class CardTableModRefBarrierSet; |
ysr@777 | 35 | class ConcurrentG1Refine; |
ysr@777 | 36 | |
johnc@2216 | 37 | // A G1RemSet in which each heap region has a rem set that records the |
johnc@2216 | 38 | // external heap references into it. Uses a mod ref bs to track updates, |
johnc@2216 | 39 | // so that they can be used to update the individual region remsets. |
johnc@2216 | 40 | |
zgu@3900 | 41 | class G1RemSet: public CHeapObj<mtGC> { |
tschatzl@5204 | 42 | private: |
tschatzl@5204 | 43 | G1RemSetSummary _prev_period_summary; |
ysr@777 | 44 | protected: |
ysr@777 | 45 | G1CollectedHeap* _g1; |
tschatzl@5204 | 46 | size_t _conc_refine_cards; |
jmasa@3357 | 47 | uint n_workers(); |
ysr@777 | 48 | |
ysr@777 | 49 | protected: |
ysr@777 | 50 | enum SomePrivateConstants { |
ysr@777 | 51 | UpdateRStoMergeSync = 0, |
ysr@777 | 52 | MergeRStoDoDirtySync = 1, |
ysr@777 | 53 | DoDirtySync = 2, |
ysr@777 | 54 | LastSync = 3, |
ysr@777 | 55 | |
ysr@777 | 56 | SeqTask = 0, |
ysr@777 | 57 | NumSeqTasks = 1 |
ysr@777 | 58 | }; |
ysr@777 | 59 | |
johnc@5014 | 60 | CardTableModRefBS* _ct_bs; |
johnc@5014 | 61 | SubTasksDone* _seq_task; |
johnc@5014 | 62 | G1CollectorPolicy* _g1p; |
ysr@777 | 63 | |
johnc@5014 | 64 | ConcurrentG1Refine* _cg1r; |
ysr@777 | 65 | |
johnc@5014 | 66 | size_t* _cards_scanned; |
johnc@5014 | 67 | size_t _total_cards_scanned; |
ysr@777 | 68 | |
johnc@2060 | 69 | // Used for caching the closure that is responsible for scanning |
johnc@2060 | 70 | // references into the collection set. |
johnc@2060 | 71 | OopsInHeapRegionClosure** _cset_rs_update_cl; |
ysr@1280 | 72 | |
tschatzl@5204 | 73 | // Print the given summary info |
tschatzl@5204 | 74 | virtual void print_summary_info(G1RemSetSummary * summary, const char * header = NULL); |
ysr@777 | 75 | public: |
ysr@777 | 76 | // This is called to reset dual hash tables after the gc pause |
ysr@777 | 77 | // is finished and the initial hash table is no longer being |
ysr@777 | 78 | // scanned. |
ysr@777 | 79 | void cleanupHRRS(); |
ysr@777 | 80 | |
johnc@2216 | 81 | G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs); |
johnc@2216 | 82 | ~G1RemSet(); |
ysr@777 | 83 | |
johnc@5548 | 84 | // Invoke "blk->do_oop" on all pointers into the collection set |
johnc@5548 | 85 | // from objects in regions outside the collection set (having |
johnc@5548 | 86 | // invoked "blk->set_region" to set the "from" region correctly |
johnc@5548 | 87 | // beforehand.) |
johnc@5548 | 88 | // |
johnc@5548 | 89 | // Invoke code_root_cl->do_code_blob on the unmarked nmethods |
johnc@5548 | 90 | // on the strong code roots list for each region in the |
johnc@5548 | 91 | // collection set. |
johnc@5548 | 92 | // |
johnc@5548 | 93 | // The "worker_i" param is for the parallel case where the id |
johnc@5548 | 94 | // of the worker thread calling this function can be helpful in |
johnc@5548 | 95 | // partitioning the work to be done. It should be the same as |
johnc@5548 | 96 | // the "i" passed to the calling thread's work(i) function. |
johnc@5548 | 97 | // In the sequential case this param will be ignored. |
johnc@5548 | 98 | void oops_into_collection_set_do(OopsInHeapRegionClosure* blk, |
johnc@5548 | 99 | CodeBlobToOopClosure* code_root_cl, |
vkempik@6552 | 100 | uint worker_i); |
ysr@777 | 101 | |
johnc@2216 | 102 | // Prepare for and cleanup after an oops_into_collection_set_do |
johnc@2216 | 103 | // call. Must call each of these once before and after (in sequential |
johnc@2216 | 104 | // code) any threads call oops_into_collection_set_do. (This offers an |
johnc@2216 | 105 | // opportunity to sequential setup and teardown of structures needed by a |
johnc@2216 | 106 | // parallel iteration over the CS's RS.) |
ysr@777 | 107 | void prepare_for_oops_into_collection_set_do(); |
ysr@777 | 108 | void cleanup_after_oops_into_collection_set_do(); |
johnc@2216 | 109 | |
johnc@5548 | 110 | void scanRS(OopsInHeapRegionClosure* oc, |
johnc@5548 | 111 | CodeBlobToOopClosure* code_root_cl, |
vkempik@6552 | 112 | uint worker_i); |
johnc@5548 | 113 | |
vkempik@6552 | 114 | void updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i); |
johnc@2216 | 115 | |
ysr@777 | 116 | CardTableModRefBS* ct_bs() { return _ct_bs; } |
ysr@777 | 117 | size_t cardsScanned() { return _total_cards_scanned; } |
ysr@777 | 118 | |
ysr@777 | 119 | // Record, if necessary, the fact that *p (where "p" is in region "from", |
ysr@777 | 120 | // which is required to be non-NULL) has changed to a new non-NULL value. |
johnc@2302 | 121 | template <class T> void write_ref(HeapRegion* from, T* p); |
johnc@2302 | 122 | template <class T> void par_write_ref(HeapRegion* from, T* p, int tid); |
ysr@777 | 123 | |
johnc@2216 | 124 | // Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region |
johnc@2216 | 125 | // or card, respectively, such that a region or card with a corresponding |
johnc@2216 | 126 | // 0 bit contains no part of any live object. Eliminates any remembered |
johnc@2216 | 127 | // set entries that correspond to dead heap ranges. |
ysr@777 | 128 | void scrub(BitMap* region_bm, BitMap* card_bm); |
johnc@2216 | 129 | |
johnc@2216 | 130 | // Like the above, but assumes is called in parallel: "worker_num" is the |
johnc@2216 | 131 | // parallel thread id of the current thread, and "claim_val" is the |
johnc@2216 | 132 | // value that should be used to claim heap regions. |
ysr@777 | 133 | void scrub_par(BitMap* region_bm, BitMap* card_bm, |
jmasa@3357 | 134 | uint worker_num, int claim_val); |
ysr@777 | 135 | |
johnc@5078 | 136 | // Refine the card corresponding to "card_ptr". |
johnc@2216 | 137 | // If check_for_refs_into_cset is true, a true result is returned |
johnc@2216 | 138 | // if the given card contains oops that have references into the |
johnc@2216 | 139 | // current collection set. |
johnc@5078 | 140 | virtual bool refine_card(jbyte* card_ptr, |
vkempik@6552 | 141 | uint worker_i, |
johnc@5078 | 142 | bool check_for_refs_into_cset); |
ysr@777 | 143 | |
tschatzl@5204 | 144 | // Print accumulated summary info from the start of the VM. |
ysr@777 | 145 | virtual void print_summary_info(); |
johnc@2216 | 146 | |
tschatzl@5204 | 147 | // Print accumulated summary info from the last time called. |
tschatzl@5807 | 148 | virtual void print_periodic_summary_info(const char* header); |
tschatzl@5204 | 149 | |
johnc@2216 | 150 | // Prepare remembered set for verification. |
ysr@777 | 151 | virtual void prepare_for_verify(); |
tschatzl@5204 | 152 | |
tschatzl@5204 | 153 | size_t conc_refine_cards() const { |
tschatzl@5204 | 154 | return _conc_refine_cards; |
tschatzl@5204 | 155 | } |
ysr@777 | 156 | }; |
ysr@777 | 157 | |
ysr@777 | 158 | class CountNonCleanMemRegionClosure: public MemRegionClosure { |
ysr@777 | 159 | G1CollectedHeap* _g1; |
ysr@777 | 160 | int _n; |
ysr@777 | 161 | HeapWord* _start_first; |
ysr@777 | 162 | public: |
ysr@777 | 163 | CountNonCleanMemRegionClosure(G1CollectedHeap* g1) : |
ysr@777 | 164 | _g1(g1), _n(0), _start_first(NULL) |
ysr@777 | 165 | {} |
ysr@777 | 166 | void do_MemRegion(MemRegion mr); |
ysr@777 | 167 | int n() { return _n; }; |
ysr@777 | 168 | HeapWord* start_first() { return _start_first; } |
ysr@777 | 169 | }; |
apetrusenko@1061 | 170 | |
coleenp@4037 | 171 | class UpdateRSOopClosure: public ExtendedOopClosure { |
apetrusenko@1061 | 172 | HeapRegion* _from; |
johnc@2216 | 173 | G1RemSet* _rs; |
vkempik@6552 | 174 | uint _worker_i; |
ysr@1280 | 175 | |
ysr@1280 | 176 | template <class T> void do_oop_work(T* p); |
ysr@1280 | 177 | |
apetrusenko@1061 | 178 | public: |
vkempik@6552 | 179 | UpdateRSOopClosure(G1RemSet* rs, uint worker_i = 0) : |
johnc@2302 | 180 | _from(NULL), _rs(rs), _worker_i(worker_i) |
johnc@2302 | 181 | {} |
apetrusenko@1061 | 182 | |
apetrusenko@1061 | 183 | void set_from(HeapRegion* from) { |
apetrusenko@1061 | 184 | assert(from != NULL, "from region must be non-NULL"); |
apetrusenko@1061 | 185 | _from = from; |
apetrusenko@1061 | 186 | } |
apetrusenko@1061 | 187 | |
ysr@1280 | 188 | virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
ysr@1280 | 189 | virtual void do_oop(oop* p) { do_oop_work(p); } |
apetrusenko@1061 | 190 | |
apetrusenko@1061 | 191 | // Override: this closure is idempotent. |
apetrusenko@1061 | 192 | // bool idempotent() { return true; } |
apetrusenko@1061 | 193 | bool apply_to_weak_ref_discovered_field() { return true; } |
apetrusenko@1061 | 194 | }; |
johnc@2060 | 195 | |
johnc@2060 | 196 | class UpdateRSetImmediate: public OopsInHeapRegionClosure { |
johnc@2060 | 197 | private: |
johnc@2060 | 198 | G1RemSet* _g1_rem_set; |
johnc@2060 | 199 | |
johnc@2060 | 200 | template <class T> void do_oop_work(T* p); |
johnc@2060 | 201 | public: |
johnc@2060 | 202 | UpdateRSetImmediate(G1RemSet* rs) : |
johnc@2060 | 203 | _g1_rem_set(rs) {} |
johnc@2060 | 204 | |
johnc@2060 | 205 | virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
johnc@2060 | 206 | virtual void do_oop( oop* p) { do_oop_work(p); } |
johnc@2060 | 207 | }; |
johnc@2302 | 208 | |
stefank@2314 | 209 | |
stefank@2314 | 210 | #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_HPP |