Mercurial > jdk8-mips64-public > hotspot / file diff

     1.1 --- a/src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp	Mon Nov 28 14:58:31 2011 +0100
     1.2 +++ b/src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp	Wed Dec 07 12:54:51 2011 -0500
     1.3 @@ -1549,9 +1549,15 @@
     1.4          _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio);
     1.5      }
     1.6  
     1.7 -    size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths;
     1.8 -    if (rs_length_diff >= 0)
     1.9 -      _rs_length_diff_seq->add((double) rs_length_diff);
    1.10 +    // It turns out that, sometimes, _max_rs_lengths can get smaller
    1.11 +    // than _recorded_rs_lengths which causes rs_length_diff to get
    1.12 +    // very large and mess up the RSet length predictions. We'll be
    1.13 +    // defensive until we work out why this happens.
    1.14 +    size_t rs_length_diff = 0;
    1.15 +    if (_max_rs_lengths > _recorded_rs_lengths) {
    1.16 +      rs_length_diff = _max_rs_lengths - _recorded_rs_lengths;
    1.17 +    }
    1.18 +    _rs_length_diff_seq->add((double) rs_length_diff);
    1.19  
    1.20      size_t copied_bytes = surviving_bytes;
    1.21      double cost_per_byte_ms = 0.0;