/*

 * Copyright (c) 2018, Oracle and/or its affiliates. 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 "gc/g1/g1RegionMarkStatsCache.inline.hpp"

#include "memory/allocation.inline.hpp"

G1RegionMarkStatsCache::G1RegionMarkStatsCache(G1RegionMarkStats* target, uint max_regions, uint num_cache_entries) :

  _num_stats(max_regions),

  _target(target),

  _num_cache_entries(num_cache_entries),

  _cache_hits(0),

  _cache_misses(0) {

  guarantee(is_power_of_2(num_cache_entries),

            "Number of cache entries must be power of two, but is %u", num_cache_entries);

  _cache = NEW_C_HEAP_ARRAY(G1RegionMarkStatsCacheEntry, _num_cache_entries, mtGC);

  _num_cache_entries_mask = _num_cache_entries - 1;

}

G1RegionMarkStatsCache::~G1RegionMarkStatsCache() {

  FREE_C_HEAP_ARRAY(G1RegionMarkStatsCacheEntry, _cache);

}

// Evict all remaining statistics, returning cache hits and misses.

Pair<size_t, size_t> G1RegionMarkStatsCache::evict_all() {

  for (uint i = 0; i < _num_cache_entries; i++) {

    evict(i);

  }

  return Pair<size_t,size_t>(_cache_hits, _cache_misses);

}

// Reset all cache entries to their default values.

void G1RegionMarkStatsCache::reset() {

  _cache_hits = 0;

  _cache_misses = 0;

  for (uint i = 0; i < _num_cache_entries; i++) {

    _cache[i].clear();

  }

}