set_min_heap_byte_size(align_size_up(Arguments::min_heap_size(),

                                          min_alignment()));

  set_max_heap_byte_size(align_size_up(MaxHeapSize, max_alignment()));

  if (initial_heap_byte_size() == 0) {

    set_initial_heap_byte_size(NewSize + OldSize);

    Universe::check_alignment(initial_heap_byte_size(), min_alignment(),

  if (min_heap_byte_size() == 0) {

    set_min_heap_byte_size(NewSize + OldSize);

    Universe::check_alignment(min_heap_byte_size(), min_alignment(),

  if (initial_heap_byte_size() < M) {

  if (min_heap_byte_size() < M) {

  if (initial_heap_byte_size() <= NewSize) {

  if (max_heap_byte_size() < min_heap_byte_size()) {

  if (initial_heap_byte_size() < min_heap_byte_size()) {

  if (max_heap_byte_size() < initial_heap_byte_size()) {

  if (PrintGCDetails && Verbose) {

    gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT "  Initial heap "

      SIZE_FORMAT "  Maximum heap " SIZE_FORMAT,

      min_heap_byte_size(), initial_heap_byte_size(), max_heap_byte_size());

  }

size_t GenCollectorPolicy::scale_by_NewRatio_aligned(size_t base_size) {

  size_t x = base_size / (NewRatio+1);

  size_t new_gen_size = x > min_alignment() ?

                     align_size_down(x, min_alignment()) :

                     min_alignment();

  return new_gen_size;

}

size_t GenCollectorPolicy::bound_minus_alignment(size_t desired_size,

                                                 size_t maximum_size) {

  size_t alignment = min_alignment();

  size_t max_minus = maximum_size - alignment;

  return desired_size < max_minus ? desired_size : max_minus;

}

  const double max_gc_minor_pause_sec = ((double) MaxGCMinorPauseMillis)/1000.0;

// Values set on the command line win over any ergonomically

// set command line parameters.

// Ergonomic choice of parameters are done before this

// method is called.  Values for command line parameters such as NewSize

// and MaxNewSize feed those ergonomic choices into this method.

// This method makes the final generation sizings consistent with

// themselves and with overall heap sizings.

// In the absence of explicitly set command line flags, policies

// such as the use of NewRatio are used to size the generation.

  // min_alignment() is used for alignment within a generation.

  // There is additional alignment done down stream for some

  // collectors that sometimes causes unwanted rounding up of

  // generations sizes.

  // Determine maximum size of gen0

  size_t max_new_size = 0;

  if (FLAG_IS_CMDLINE(MaxNewSize)) {

    if (MaxNewSize < min_alignment()) {

      max_new_size = min_alignment();

    } else if (MaxNewSize >= max_heap_byte_size()) {

      max_new_size = align_size_down(max_heap_byte_size() - min_alignment(),

                                     min_alignment());

      warning("MaxNewSize (" SIZE_FORMAT "k) is equal to or "

        "greater than the entire heap (" SIZE_FORMAT "k).  A "

        "new generation size of " SIZE_FORMAT "k will be used.",

        MaxNewSize/K, max_heap_byte_size()/K, max_new_size/K);

    } else {

      max_new_size = align_size_down(MaxNewSize, min_alignment());

    }

  // The case for FLAG_IS_ERGO(MaxNewSize) could be treated

  // specially at this point to just use an ergonomically set

  // MaxNewSize to set max_new_size.  For cases with small

  // heaps such a policy often did not work because the MaxNewSize

  // was larger than the entire heap.  The interpretation given

  // to ergonomically set flags is that the flags are set

  // by different collectors for their own special needs but

  // are not allowed to badly shape the heap.  This allows the

  // different collectors to decide what's best for themselves

  // without having to factor in the overall heap shape.  It

  // can be the case in the future that the collectors would

  // only make "wise" ergonomics choices and this policy could

  // just accept those choices.  The choices currently made are

  // not always "wise".

    max_new_size = scale_by_NewRatio_aligned(max_heap_byte_size());

    // Bound the maximum size by NewSize below (since it historically

    // Ergonomics plays here by previously calculating the desired

    // NewSize and MaxNewSize.

    max_new_size = MIN2(MAX2(max_new_size, NewSize), MaxNewSize);

  }

  assert(max_new_size > 0, "All paths should set max_new_size");

  // Given the maximum gen0 size, determine the initial and

  // minimum sizes.

  if (max_heap_byte_size() == min_heap_byte_size()) {

    // The maximum and minimum heap sizes are the same so

    // the generations minimum and initial must be the

    // same as its maximum.

    set_min_gen0_size(max_new_size);

    set_initial_gen0_size(max_new_size);

    set_max_gen0_size(max_new_size);

  } else {

    size_t desired_new_size = 0;

    if (!FLAG_IS_DEFAULT(NewSize)) {

      // If NewSize is set ergonomically (for example by cms), it

      // would make sense to use it.  If it is used, also use it

      // to set the initial size.  Although there is no reason

      // the minimum size and the initial size have to be the same,

      // the current implementation gets into trouble during the calculation

      // of the tenured generation sizes if they are different.

      // Note that this makes the initial size and the minimum size

      // generally small compared to the NewRatio calculation.

      _min_gen0_size = NewSize;

      desired_new_size = NewSize;

      max_new_size = MAX2(max_new_size, NewSize);

    } else {

      // For the case where NewSize is the default, use NewRatio

      // to size the minimum and initial generation sizes.

      // Use the default NewSize as the floor for these values.  If

      // NewRatio is overly large, the resulting sizes can be too

      // small.

      _min_gen0_size = MAX2(scale_by_NewRatio_aligned(min_heap_byte_size()),

                          NewSize);

      desired_new_size =

        MAX2(scale_by_NewRatio_aligned(initial_heap_byte_size()),

             NewSize);

    }

    assert(_min_gen0_size > 0, "Sanity check");

    set_initial_gen0_size(desired_new_size);

    set_max_gen0_size(max_new_size);

    // At this point the desirable initial and minimum sizes have been

    // determined without regard to the maximum sizes.

    // Bound the sizes by the corresponding overall heap sizes.

    set_min_gen0_size(

      bound_minus_alignment(_min_gen0_size, min_heap_byte_size()));

    set_initial_gen0_size(

      bound_minus_alignment(_initial_gen0_size, initial_heap_byte_size()));

    set_max_gen0_size(

      bound_minus_alignment(_max_gen0_size, max_heap_byte_size()));

    // At this point all three sizes have been checked against the

    // maximum sizes but have not been checked for consistency

    // amoung the three.

    // Final check min <= initial <= max

    set_min_gen0_size(MIN2(_min_gen0_size, _max_gen0_size));

    set_initial_gen0_size(

      MAX2(MIN2(_initial_gen0_size, _max_gen0_size), _min_gen0_size));

    set_min_gen0_size(MIN2(_min_gen0_size, _initial_gen0_size));

  if (PrintGCDetails && Verbose) {

    gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT "  Initial gen0 "

      SIZE_FORMAT "  Maximum gen0 " SIZE_FORMAT,

      min_gen0_size(), initial_gen0_size(), max_gen0_size());

  }

}

// Call this method during the sizing of the gen1 to make

// adjustments to gen0 because of gen1 sizing policy.  gen0 initially has

// the most freedom in sizing because it is done before the

// policy for gen1 is applied.  Once gen1 policies have been applied,

// there may be conflicts in the shape of the heap and this method

// is used to make the needed adjustments.  The application of the

// policies could be more sophisticated (iterative for example) but

// keeping it simple also seems a worthwhile goal.

bool TwoGenerationCollectorPolicy::adjust_gen0_sizes(size_t* gen0_size_ptr,

                                                     size_t* gen1_size_ptr,

                                                     size_t heap_size,

                                                     size_t min_gen0_size) {

  bool result = false;

  if ((*gen1_size_ptr + *gen0_size_ptr) > heap_size) {

    if (((*gen0_size_ptr + OldSize) > heap_size) &&

       (heap_size - min_gen0_size) >= min_alignment()) {

      // Adjust gen0 down to accomodate OldSize

      *gen0_size_ptr = heap_size - min_gen0_size;

      *gen0_size_ptr =

        MAX2((uintx)align_size_down(*gen0_size_ptr, min_alignment()),

             min_alignment());

      assert(*gen0_size_ptr > 0, "Min gen0 is too large");

      result = true;

    } else {

      *gen1_size_ptr = heap_size - *gen0_size_ptr;

      *gen1_size_ptr =

        MAX2((uintx)align_size_down(*gen1_size_ptr, min_alignment()),

                       min_alignment());

    }

  }

  return result;

}

// Minimum sizes of the generations may be different than

// the initial sizes.  An inconsistently is permitted here

// in the total size that can be specified explicitly by

// command line specification of OldSize and NewSize and

// also a command line specification of -Xms.  Issue a warning

// but allow the values to pass.

  // At this point the minimum, initial and maximum sizes

  // of the overall heap and of gen0 have been determined.

  // The maximum gen1 size can be determined from the maximum gen0

  // and maximum heap size since not explicit flags exits

  // for setting the gen1 maximum.

  _max_gen1_size = max_heap_byte_size() - _max_gen0_size;

  _max_gen1_size =

    MAX2((uintx)align_size_down(_max_gen1_size, min_alignment()),

         min_alignment());

  // If no explicit command line flag has been set for the

  // gen1 size, use what is left for gen1.

  if (FLAG_IS_DEFAULT(OldSize) || FLAG_IS_ERGO(OldSize)) {

    // The user has not specified any value or ergonomics

    // has chosen a value (which may or may not be consistent

    // with the overall heap size).  In either case make

    // the minimum, maximum and initial sizes consistent

    // with the gen0 sizes and the overall heap sizes.

    assert(min_heap_byte_size() > _min_gen0_size,

      "gen0 has an unexpected minimum size");

    set_min_gen1_size(min_heap_byte_size() - min_gen0_size());

    set_min_gen1_size(

      MAX2((uintx)align_size_down(_min_gen1_size, min_alignment()),

           min_alignment()));

    set_initial_gen1_size(initial_heap_byte_size() - initial_gen0_size());

    set_initial_gen1_size(

      MAX2((uintx)align_size_down(_initial_gen1_size, min_alignment()),

           min_alignment()));

  } else {

    // It's been explicitly set on the command line.  Use the

    // OldSize and then determine the consequences.

    set_min_gen1_size(OldSize);

    set_initial_gen1_size(OldSize);

    // If the user has explicitly set an OldSize that is inconsistent

    // with other command line flags, issue a warning.

    if ((_min_gen1_size + _min_gen0_size + min_alignment()) <

           min_heap_byte_size()) {

          "generation sizes: using minimum heap = " SIZE_FORMAT,

          min_heap_byte_size());

    }

    if ((OldSize > _max_gen1_size)) {

      warning("Inconsistency between maximum heap size and maximum "

          "generation sizes: using maximum heap = " SIZE_FORMAT

          " -XX:OldSize flag is being ignored",

          max_heap_byte_size());

  }

    // If there is an inconsistency between the OldSize and the minimum and/or

    // initial size of gen0, since OldSize was explicitly set, OldSize wins.

    if (adjust_gen0_sizes(&_min_gen0_size, &_min_gen1_size,

                          min_heap_byte_size(), OldSize)) {

      if (PrintGCDetails && Verbose) {

        gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT "  Initial gen0 "

              SIZE_FORMAT "  Maximum gen0 " SIZE_FORMAT,

              min_gen0_size(), initial_gen0_size(), max_gen0_size());

      }

    // Initial size

    if (adjust_gen0_sizes(&_initial_gen0_size, &_initial_gen1_size,

                         initial_heap_byte_size(), OldSize)) {

      if (PrintGCDetails && Verbose) {

        gclog_or_tty->print_cr("Minimum gen0 " SIZE_FORMAT "  Initial gen0 "

          SIZE_FORMAT "  Maximum gen0 " SIZE_FORMAT,

          min_gen0_size(), initial_gen0_size(), max_gen0_size());

      }

    }

  // Enforce the maximum gen1 size.

  set_min_gen1_size(MIN2(_min_gen1_size, _max_gen1_size));

  // Check that min gen1 <= initial gen1 <= max gen1

  set_initial_gen1_size(MAX2(_initial_gen1_size, _min_gen1_size));

  set_initial_gen1_size(MIN2(_initial_gen1_size, _max_gen1_size));

  if (PrintGCDetails && Verbose) {

    gclog_or_tty->print_cr("Minimum gen1 " SIZE_FORMAT "  Initial gen1 "

      SIZE_FORMAT "  Maximum gen1 " SIZE_FORMAT,

      min_gen1_size(), initial_gen1_size(), max_gen1_size());

  }