src/share/vm/gc/parallel/cardTableExtension.cpp

*** 502,519 ****
          MemRegion(min_prev_start, cur_committed.end());
      cur_committed = new_committed;
    }
  #ifdef ASSERT
    ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
!   assert(cur_committed.start() == align_ptr_up(cur_committed.start(), os::vm_page_size()),
      "Starts should have proper alignment");
  #endif
  
    jbyte* new_start = byte_for(new_region.start());
    // Round down because this is for the start address
    HeapWord* new_start_aligned =
!     (HeapWord*)align_size_down((uintptr_t)new_start, os::vm_page_size());
    // The guard page is always committed and should not be committed over.
    // This method is used in cases where the generation is growing toward
    // lower addresses but the guard region is still at the end of the
    // card table.  That still makes sense when looking for writes
    // off the end of the card table.
--- 502,519 ----
          MemRegion(min_prev_start, cur_committed.end());
      cur_committed = new_committed;
    }
  #ifdef ASSERT
    ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
!   assert(cur_committed.start() == align_up(cur_committed.start(), os::vm_page_size()),
      "Starts should have proper alignment");
  #endif
  
    jbyte* new_start = byte_for(new_region.start());
    // Round down because this is for the start address
    HeapWord* new_start_aligned =
!     (HeapWord*)align_down((uintptr_t)new_start, os::vm_page_size());
    // The guard page is always committed and should not be committed over.
    // This method is used in cases where the generation is growing toward
    // lower addresses but the guard region is still at the end of the
    // card table.  That still makes sense when looking for writes
    // off the end of the card table.
*** 582,592 ****
                                                         MemRegion new_region) {
  
    jbyte* new_start = byte_for(new_region.start());
    // Set the new start of the committed region
    HeapWord* new_start_aligned =
!     (HeapWord*)align_ptr_down(new_start, os::vm_page_size());
    MemRegion new_committed = MemRegion(new_start_aligned,
      _committed[changed_region].end());
    _committed[changed_region] = new_committed;
    _committed[changed_region].set_start(new_start_aligned);
  }
--- 582,592 ----
                                                         MemRegion new_region) {
  
    jbyte* new_start = byte_for(new_region.start());
    // Set the new start of the committed region
    HeapWord* new_start_aligned =
!     (HeapWord*)align_down(new_start, os::vm_page_size());
    MemRegion new_committed = MemRegion(new_start_aligned,
      _committed[changed_region].end());
    _committed[changed_region] = new_committed;
    _committed[changed_region].set_start(new_start_aligned);
  }