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Diffstat (limited to 'src/mem/ruby/filters/MultiGrainBloomFilter.cc')
-rw-r--r-- | src/mem/ruby/filters/MultiGrainBloomFilter.cc | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/mem/ruby/filters/MultiGrainBloomFilter.cc b/src/mem/ruby/filters/MultiGrainBloomFilter.cc new file mode 100644 index 000000000..108168db3 --- /dev/null +++ b/src/mem/ruby/filters/MultiGrainBloomFilter.cc @@ -0,0 +1,170 @@ + +/* + * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * MultiGrainBloomFilter.cc + * + * Description: + * + * + */ + +#include "mem/ruby/filters/MultiGrainBloomFilter.hh" +#include "mem/gems_common/Map.hh" +#include "mem/ruby/common/Address.hh" + +MultiGrainBloomFilter::MultiGrainBloomFilter(string str) +{ + string tail(str); + + // split into the 2 filter sizes + string head = string_split(tail, '_'); + + // head contains size of 1st bloom filter, tail contains size of 2nd bloom filter + + m_filter_size = atoi(head.c_str()); + m_filter_size_bits = log_int(m_filter_size); + + m_page_filter_size = atoi(tail.c_str()); + m_page_filter_size_bits = log_int(m_page_filter_size); + + m_filter.setSize(m_filter_size); + m_page_filter.setSize(m_page_filter_size); + clear(); +} + +MultiGrainBloomFilter::~MultiGrainBloomFilter(){ +} + +void MultiGrainBloomFilter::clear() +{ + for (int i = 0; i < m_filter_size; i++) { + m_filter[i] = 0; + } + for(int i=0; i < m_page_filter_size; ++i){ + m_page_filter[i] = 0; + } +} + +void MultiGrainBloomFilter::increment(const Address& addr) +{ + // Not used +} + + +void MultiGrainBloomFilter::decrement(const Address& addr) +{ + // Not used +} + +void MultiGrainBloomFilter::merge(AbstractBloomFilter * other_filter) +{ + // TODO +} + +void MultiGrainBloomFilter::set(const Address& addr) +{ + int i = get_block_index(addr); + assert(i < m_filter_size); + assert(get_page_index(addr) < m_page_filter_size); + m_filter[i] = 1; + m_page_filter[i] = 1; + +} + +void MultiGrainBloomFilter::unset(const Address& addr) +{ + // not used +} + +bool MultiGrainBloomFilter::isSet(const Address& addr) +{ + int i = get_block_index(addr); + assert(i < m_filter_size); + assert(get_page_index(addr) < m_page_filter_size); + // we have to have both indices set + return (m_filter[i] && m_page_filter[i]); +} + +int MultiGrainBloomFilter::getCount(const Address& addr) +{ + // not used + return 0; +} + +int MultiGrainBloomFilter::getTotalCount() +{ + int count = 0; + + for (int i = 0; i < m_filter_size; i++) { + count += m_filter[i]; + } + + for(int i=0; i < m_page_filter_size; ++i){ + count += m_page_filter[i] = 0; + } + + return count; +} + +int MultiGrainBloomFilter::getIndex(const Address& addr) +{ + return 0; + // TODO +} + +int MultiGrainBloomFilter::readBit(const int index) { + return 0; + // TODO +} + +void MultiGrainBloomFilter::writeBit(const int index, const int value) { + // TODO +} + +void MultiGrainBloomFilter::print(ostream& out) const +{ +} + +int MultiGrainBloomFilter::get_block_index(const Address& addr) +{ + // grap a chunk of bits after byte offset + return addr.bitSelect( RubySystem::getBlockSizeBits(), RubySystem::getBlockSizeBits() + m_filter_size_bits - 1); +} + +int MultiGrainBloomFilter::get_page_index(const Address & addr) +{ + // grap a chunk of bits after first chunk + return addr.bitSelect( RubySystem::getBlockSizeBits() + m_filter_size_bits - 1, + RubySystem::getBlockSizeBits() + m_filter_size_bits - 1 + m_page_filter_size_bits - 1); +} + + + + |