Mercurial > hg > truffle
diff src/share/vm/memory/cardTableModRefBS.cpp @ 20337:1f1d373cd044
8038423: G1: Decommit memory within heap
Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps.
Reviewed-by: mgerdin, brutisso, jwilhelm
author | tschatzl |
---|---|
date | Thu, 21 Aug 2014 11:47:10 +0200 |
parents | 2c6ef90f030a |
children | 7848fc12602b |
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--- a/src/share/vm/memory/cardTableModRefBS.cpp Tue Aug 19 10:50:27 2014 +0200 +++ b/src/share/vm/memory/cardTableModRefBS.cpp Thu Aug 21 11:47:10 2014 +0200 @@ -44,13 +44,6 @@ // enumerate ref fields that have been modified (since the last // enumeration.) -size_t CardTableModRefBS::cards_required(size_t covered_words) -{ - // Add one for a guard card, used to detect errors. - const size_t words = align_size_up(covered_words, card_size_in_words); - return words / card_size_in_words + 1; -} - size_t CardTableModRefBS::compute_byte_map_size() { assert(_guard_index == cards_required(_whole_heap.word_size()) - 1, @@ -64,27 +57,50 @@ int max_covered_regions): ModRefBarrierSet(max_covered_regions), _whole_heap(whole_heap), - _guard_index(cards_required(whole_heap.word_size()) - 1), - _last_valid_index(_guard_index - 1), + _guard_index(0), + _guard_region(), + _last_valid_index(0), _page_size(os::vm_page_size()), - _byte_map_size(compute_byte_map_size()) + _byte_map_size(0), + _covered(NULL), + _committed(NULL), + _cur_covered_regions(0), + _byte_map(NULL), + byte_map_base(NULL), + // LNC functionality + _lowest_non_clean(NULL), + _lowest_non_clean_chunk_size(NULL), + _lowest_non_clean_base_chunk_index(NULL), + _last_LNC_resizing_collection(NULL) { _kind = BarrierSet::CardTableModRef; + assert((uintptr_t(_whole_heap.start()) & (card_size - 1)) == 0, "heap must start at card boundary"); + assert((uintptr_t(_whole_heap.end()) & (card_size - 1)) == 0, "heap must end at card boundary"); + + assert(card_size <= 512, "card_size must be less than 512"); // why? + + _covered = new MemRegion[_max_covered_regions]; + if (_covered == NULL) { + vm_exit_during_initialization("Could not allocate card table covered region set."); + } +} + +void CardTableModRefBS::initialize() { + _guard_index = cards_required(_whole_heap.word_size()) - 1; + _last_valid_index = _guard_index - 1; + + _byte_map_size = compute_byte_map_size(); + HeapWord* low_bound = _whole_heap.start(); HeapWord* high_bound = _whole_heap.end(); - assert((uintptr_t(low_bound) & (card_size - 1)) == 0, "heap must start at card boundary"); - assert((uintptr_t(high_bound) & (card_size - 1)) == 0, "heap must end at card boundary"); - assert(card_size <= 512, "card_size must be less than 512"); // why? - - _covered = new MemRegion[max_covered_regions]; - _committed = new MemRegion[max_covered_regions]; - if (_covered == NULL || _committed == NULL) { - vm_exit_during_initialization("couldn't alloc card table covered region set."); + _cur_covered_regions = 0; + _committed = new MemRegion[_max_covered_regions]; + if (_committed == NULL) { + vm_exit_during_initialization("Could not allocate card table committed region set."); } - _cur_covered_regions = 0; const size_t rs_align = _page_size == (size_t) os::vm_page_size() ? 0 : MAX2(_page_size, (size_t) os::vm_allocation_granularity()); ReservedSpace heap_rs(_byte_map_size, rs_align, false); @@ -114,20 +130,20 @@ !ExecMem, "card table last card"); *guard_card = last_card; - _lowest_non_clean = - NEW_C_HEAP_ARRAY(CardArr, max_covered_regions, mtGC); + _lowest_non_clean = + NEW_C_HEAP_ARRAY(CardArr, _max_covered_regions, mtGC); _lowest_non_clean_chunk_size = - NEW_C_HEAP_ARRAY(size_t, max_covered_regions, mtGC); + NEW_C_HEAP_ARRAY(size_t, _max_covered_regions, mtGC); _lowest_non_clean_base_chunk_index = - NEW_C_HEAP_ARRAY(uintptr_t, max_covered_regions, mtGC); + NEW_C_HEAP_ARRAY(uintptr_t, _max_covered_regions, mtGC); _last_LNC_resizing_collection = - NEW_C_HEAP_ARRAY(int, max_covered_regions, mtGC); + NEW_C_HEAP_ARRAY(int, _max_covered_regions, mtGC); if (_lowest_non_clean == NULL || _lowest_non_clean_chunk_size == NULL || _lowest_non_clean_base_chunk_index == NULL || _last_LNC_resizing_collection == NULL) vm_exit_during_initialization("couldn't allocate an LNC array."); - for (int i = 0; i < max_covered_regions; i++) { + for (int i = 0; i < _max_covered_regions; i++) { _lowest_non_clean[i] = NULL; _lowest_non_clean_chunk_size[i] = 0; _last_LNC_resizing_collection[i] = -1; @@ -650,7 +666,7 @@ jbyte val, bool val_equals) { jbyte* start = byte_for(mr.start()); jbyte* end = byte_for(mr.last()); - bool failures = false; + bool failures = false; for (jbyte* curr = start; curr <= end; ++curr) { jbyte curr_val = *curr; bool failed = (val_equals) ? (curr_val != val) : (curr_val == val);