/*
 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2020 SAP SE. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "precompiled.hpp"
#include "memory/metaspace/chunkLevel.hpp"
#include "utilities/debug.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/ostream.hpp"
#include "utilities/powerOfTwo.hpp"

namespace metaspace {

using namespace chunklevel;

chunklevel_t chunklevel::level_fitting_word_size(size_t word_size) {

  assert(MAX_CHUNK_WORD_SIZE >= word_size,
         SIZE_FORMAT " - too large allocation size.", word_size * BytesPerWord);

  if (word_size <= MIN_CHUNK_WORD_SIZE) {
    return HIGHEST_CHUNK_LEVEL;
  }

  const size_t v_pow2 = round_up_power_of_2(word_size);
  const chunklevel_t lvl =  (chunklevel_t)(exact_log2(MAX_CHUNK_WORD_SIZE) - exact_log2(v_pow2));

  return lvl;

}

void chunklevel::print_chunk_size(outputStream* st, chunklevel_t lvl) {
  if (chunklevel::is_valid_level(lvl)) {
    const size_t s = chunklevel::word_size_for_level(lvl) * BytesPerWord;
    if (s < 1 * M) {
      st->print("%3uk", (unsigned)(s / K));
    } else {
      st->print("%3um", (unsigned)(s / M));
    }
  } else {
    st->print("?-?");
  }

}

} // namespace metaspace