src/share/vm/gc_implementation/g1/g1Allocator.cpp

rev 7471 : 8060025: Object copy time regressions after JDK-8031323 and JDK-8057536
Summary: Evaluate and improve object copy time by micro-optimizations and splitting out slow and fast paths aggressively.
Reviewed-by:
Contributed-by: Tony Printezis <tprintezis@twitter.com>, Thomas Schatzl <thomas.schatzl@oracle.com>
rev 7472 : [mq]: 8060025-mikael-review1

*** 148,162 ****
    _alloc_buffers[InCSetState::Young] = &_surviving_alloc_buffer;
    _alloc_buffers[InCSetState::Old]  = &_tenured_alloc_buffer;
  }
  
  void G1DefaultParGCAllocator::retire_alloc_buffers() {
!   for (uint i = 0; i < InCSetState::Num; i += 1) {
!     G1ParGCAllocBuffer* const buf = _alloc_buffers[i];
      if (buf != NULL) {
        add_to_alloc_buffer_waste(buf->words_remaining());
!       buf->flush_stats_and_retire(_g1h->alloc_buffer_stats(i),
                                    true /* end_of_gc */,
                                    false /* retain */);
      }
    }
  }
--- 148,162 ----
    _alloc_buffers[InCSetState::Young] = &_surviving_alloc_buffer;
    _alloc_buffers[InCSetState::Old]  = &_tenured_alloc_buffer;
  }
  
  void G1DefaultParGCAllocator::retire_alloc_buffers() {
!   for (uint state = 0; state < InCSetState::Num; state += 1) {
!     G1ParGCAllocBuffer* const buf = _alloc_buffers[state];
      if (buf != NULL) {
        add_to_alloc_buffer_waste(buf->words_remaining());
!       buf->flush_stats_and_retire(_g1h->alloc_buffer_stats(state),
                                    true /* end_of_gc */,
                                    false /* retain */);
      }
    }
  }