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src/hotspot/share/gc/g1/g1CollectedHeap.cpp

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rev 50098 : [mq]: 8202842-g1-footprint-regressions

*** 1609,1618 **** --- 1609,1621 ---- // 6843694 - ensure that the maximum region index can fit // in the remembered set structures. const uint max_region_idx = (1U << (sizeof(RegionIdx_t)*BitsPerByte-1)) - 1; guarantee((max_regions() - 1) <= max_region_idx, "too many regions"); + // The G1FromCardCache reserves card with value 0 as "invalid", so the heap must not + // start within the first card. + guarantee(g1_rs.base() >= (char*)G1CardTable::card_size, "Java heap must not start within the first card."); // Also create a G1 rem set. _g1_rem_set = new G1RemSet(this, _card_table, _hot_card_cache); _g1_rem_set->initialize(max_capacity(), max_regions()); size_t max_cards_per_region = ((size_t)1 << (sizeof(CardIdx_t)*BitsPerByte-1)) - 1;
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