Tue, 19 May 2015 15:49:27 +0200
8061715: gc/g1/TestShrinkAuxiliaryData15.java fails with java.lang.RuntimeException: heap decommit failed - after > before
Summary: added WhiteBox methods to count regions and exact aux data sizes
Reviewed-by: jwilhelm, brutisso
johnc@5078 | 1 | /* |
drchase@6680 | 2 | * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. |
johnc@5078 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
johnc@5078 | 4 | * |
johnc@5078 | 5 | * This code is free software; you can redistribute it and/or modify it |
johnc@5078 | 6 | * under the terms of the GNU General Public License version 2 only, as |
johnc@5078 | 7 | * published by the Free Software Foundation. |
johnc@5078 | 8 | * |
johnc@5078 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
johnc@5078 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
johnc@5078 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
johnc@5078 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
johnc@5078 | 13 | * accompanied this code). |
johnc@5078 | 14 | * |
johnc@5078 | 15 | * You should have received a copy of the GNU General Public License version |
johnc@5078 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
johnc@5078 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
johnc@5078 | 18 | * |
johnc@5078 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
johnc@5078 | 20 | * or visit www.oracle.com if you need additional information or have any |
johnc@5078 | 21 | * questions. |
johnc@5078 | 22 | * |
johnc@5078 | 23 | */ |
johnc@5078 | 24 | |
johnc@5078 | 25 | #include "precompiled.hpp" |
johnc@5078 | 26 | #include "gc_implementation/g1/g1CardCounts.hpp" |
johnc@5078 | 27 | #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
johnc@5078 | 28 | #include "gc_implementation/g1/g1CollectorPolicy.hpp" |
johnc@5078 | 29 | #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
johnc@5078 | 30 | #include "memory/cardTableModRefBS.hpp" |
johnc@5078 | 31 | #include "services/memTracker.hpp" |
johnc@5078 | 32 | #include "utilities/copy.hpp" |
johnc@5078 | 33 | |
drchase@6680 | 34 | PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
drchase@6680 | 35 | |
tschatzl@7257 | 36 | void G1CardCountsMappingChangedListener::on_commit(uint start_idx, size_t num_regions, bool zero_filled) { |
tschatzl@7257 | 37 | if (zero_filled) { |
tschatzl@7257 | 38 | return; |
tschatzl@7257 | 39 | } |
tschatzl@7051 | 40 | MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_idx), num_regions * HeapRegion::GrainWords); |
tschatzl@7051 | 41 | _counts->clear_range(mr); |
tschatzl@7051 | 42 | } |
tschatzl@7051 | 43 | |
johnc@5078 | 44 | void G1CardCounts::clear_range(size_t from_card_num, size_t to_card_num) { |
johnc@5078 | 45 | if (has_count_table()) { |
johnc@5078 | 46 | assert(from_card_num < to_card_num, |
johnc@5078 | 47 | err_msg("Wrong order? from: " SIZE_FORMAT ", to: "SIZE_FORMAT, |
johnc@5078 | 48 | from_card_num, to_card_num)); |
johnc@5078 | 49 | Copy::fill_to_bytes(&_card_counts[from_card_num], (to_card_num - from_card_num)); |
johnc@5078 | 50 | } |
johnc@5078 | 51 | } |
johnc@5078 | 52 | |
johnc@5078 | 53 | G1CardCounts::G1CardCounts(G1CollectedHeap *g1h): |
tschatzl@7051 | 54 | _listener(), _g1h(g1h), _card_counts(NULL), _reserved_max_card_num(0) { |
tschatzl@7051 | 55 | _listener.set_cardcounts(this); |
tschatzl@7051 | 56 | } |
johnc@5078 | 57 | |
tschatzl@7051 | 58 | void G1CardCounts::initialize(G1RegionToSpaceMapper* mapper) { |
johnc@5078 | 59 | assert(_g1h->max_capacity() > 0, "initialization order"); |
johnc@5078 | 60 | assert(_g1h->capacity() == 0, "initialization order"); |
johnc@5078 | 61 | |
johnc@5078 | 62 | if (G1ConcRSHotCardLimit > 0) { |
johnc@5078 | 63 | // The max value we can store in the counts table is |
johnc@5078 | 64 | // max_jubyte. Guarantee the value of the hot |
johnc@5078 | 65 | // threshold limit is no more than this. |
johnc@5078 | 66 | guarantee(G1ConcRSHotCardLimit <= max_jubyte, "sanity"); |
johnc@5078 | 67 | |
mgerdin@5811 | 68 | _ct_bs = _g1h->g1_barrier_set(); |
johnc@5078 | 69 | _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start()); |
johnc@5078 | 70 | |
tschatzl@7051 | 71 | _card_counts = (jubyte*) mapper->reserved().start(); |
tschatzl@7051 | 72 | _reserved_max_card_num = mapper->reserved().byte_size(); |
tschatzl@7051 | 73 | mapper->set_mapping_changed_listener(&_listener); |
johnc@5078 | 74 | } |
johnc@5078 | 75 | } |
johnc@5078 | 76 | |
johnc@5078 | 77 | uint G1CardCounts::add_card_count(jbyte* card_ptr) { |
johnc@5078 | 78 | // Returns the number of times the card has been refined. |
johnc@5078 | 79 | // If we failed to reserve/commit the counts table, return 0. |
johnc@5078 | 80 | // If card_ptr is beyond the committed end of the counts table, |
johnc@5078 | 81 | // return 0. |
johnc@5078 | 82 | // Otherwise return the actual count. |
johnc@5078 | 83 | // Unless G1ConcRSHotCardLimit has been set appropriately, |
johnc@5078 | 84 | // returning 0 will result in the card being considered |
johnc@5078 | 85 | // cold and will be refined immediately. |
johnc@5078 | 86 | uint count = 0; |
johnc@5078 | 87 | if (has_count_table()) { |
johnc@5078 | 88 | size_t card_num = ptr_2_card_num(card_ptr); |
tschatzl@7051 | 89 | assert(card_num < _reserved_max_card_num, |
tschatzl@7051 | 90 | err_msg("Card "SIZE_FORMAT" outside of card counts table (max size "SIZE_FORMAT")", |
tschatzl@7051 | 91 | card_num, _reserved_max_card_num)); |
tschatzl@7051 | 92 | count = (uint) _card_counts[card_num]; |
tschatzl@7051 | 93 | if (count < G1ConcRSHotCardLimit) { |
tschatzl@7051 | 94 | _card_counts[card_num] = |
tschatzl@7051 | 95 | (jubyte)(MIN2((uintx)(_card_counts[card_num] + 1), G1ConcRSHotCardLimit)); |
johnc@5078 | 96 | } |
johnc@5078 | 97 | } |
johnc@5078 | 98 | return count; |
johnc@5078 | 99 | } |
johnc@5078 | 100 | |
johnc@5078 | 101 | bool G1CardCounts::is_hot(uint count) { |
johnc@5078 | 102 | return (count >= G1ConcRSHotCardLimit); |
johnc@5078 | 103 | } |
johnc@5078 | 104 | |
johnc@5078 | 105 | void G1CardCounts::clear_region(HeapRegion* hr) { |
tschatzl@7051 | 106 | MemRegion mr(hr->bottom(), hr->end()); |
tschatzl@7051 | 107 | clear_range(mr); |
tschatzl@7051 | 108 | } |
tschatzl@7051 | 109 | |
tschatzl@7051 | 110 | void G1CardCounts::clear_range(MemRegion mr) { |
johnc@5078 | 111 | if (has_count_table()) { |
tschatzl@7051 | 112 | const jbyte* from_card_ptr = _ct_bs->byte_for_const(mr.start()); |
tschatzl@7051 | 113 | // We use the last address in the range as the range could represent the |
tschatzl@7051 | 114 | // last region in the heap. In which case trying to find the card will be an |
tschatzl@7051 | 115 | // OOB access to the card table. |
tschatzl@7051 | 116 | const jbyte* last_card_ptr = _ct_bs->byte_for_const(mr.last()); |
johnc@5078 | 117 | |
johnc@5078 | 118 | #ifdef ASSERT |
johnc@5078 | 119 | HeapWord* start_addr = _ct_bs->addr_for(from_card_ptr); |
tschatzl@7051 | 120 | assert(start_addr == mr.start(), "MemRegion start must be aligned to a card."); |
johnc@5078 | 121 | HeapWord* last_addr = _ct_bs->addr_for(last_card_ptr); |
tschatzl@7051 | 122 | assert((last_addr + CardTableModRefBS::card_size_in_words) == mr.end(), "MemRegion end must be aligned to a card."); |
johnc@5078 | 123 | #endif // ASSERT |
johnc@5078 | 124 | |
johnc@5078 | 125 | // Clear the counts for the (exclusive) card range. |
johnc@5078 | 126 | size_t from_card_num = ptr_2_card_num(from_card_ptr); |
johnc@5078 | 127 | size_t to_card_num = ptr_2_card_num(last_card_ptr) + 1; |
johnc@5078 | 128 | clear_range(from_card_num, to_card_num); |
johnc@5078 | 129 | } |
johnc@5078 | 130 | } |
johnc@5078 | 131 | |
tschatzl@7051 | 132 | class G1CardCountsClearClosure : public HeapRegionClosure { |
tschatzl@7051 | 133 | private: |
tschatzl@7051 | 134 | G1CardCounts* _card_counts; |
tschatzl@7051 | 135 | public: |
tschatzl@7051 | 136 | G1CardCountsClearClosure(G1CardCounts* card_counts) : |
tschatzl@7051 | 137 | HeapRegionClosure(), _card_counts(card_counts) { } |
tschatzl@7051 | 138 | |
tschatzl@7051 | 139 | |
tschatzl@7051 | 140 | virtual bool doHeapRegion(HeapRegion* r) { |
tschatzl@7051 | 141 | _card_counts->clear_region(r); |
tschatzl@7051 | 142 | return false; |
tschatzl@7051 | 143 | } |
tschatzl@7051 | 144 | }; |
tschatzl@7051 | 145 | |
johnc@5078 | 146 | void G1CardCounts::clear_all() { |
johnc@5078 | 147 | assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise"); |
tschatzl@7051 | 148 | G1CardCountsClearClosure cl(this); |
tschatzl@7051 | 149 | _g1h->heap_region_iterate(&cl); |
johnc@5078 | 150 | } |