解析GPU cache 中读写操作及其事件

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基于GPGPU-SIM代码，对读写操作进行解析

1.对于cache不应用写回策略的发送读请求

/// Read miss handler without writebackvoid baseline_cache::send_read_request(new_addr_type addr, new_addr_type block_addr, unsigned cache_index, mem_fetch *mf,        unsigned time, bool &do_miss, std::list<cache_event> &events, bool read_only, bool wa){    bool wb=false;    cache_block_t e;    send_read_request(addr, block_addr, cache_index, mf, time, do_miss, wb, e, events, read_only, wa);}

2.对于cache 应用写回策略的发送读请求

/// Read miss handler. Check MSHR hit or MSHR available///检查MSHR是否命中，或者满void baseline_cache::send_read_request(new_addr_type addr, new_addr_type block_addr, unsigned cache_index, mem_fetch *mf,        unsigned time, bool &do_miss, bool &wb, cache_block_t &evicted, std::list<cache_event> &events, bool read_only, bool wa){    bool mshr_hit = m_mshrs.probe(block_addr);    bool mshr_avail = !m_mshrs.full(block_addr);    if ( mshr_hit && mshr_avail ) {        if(read_only)            m_tag_array->access(block_addr,time,cache_index);        else            m_tag_array->access(block_addr,time,cache_index,wb,evicted);        m_mshrs.add(block_addr,mf);        do_miss = true;    } else if ( !mshr_hit && mshr_avail && (m_miss_queue.size() < m_config.m_miss_queue_size) ) {        if(read_only)            m_tag_array->access(block_addr,time,cache_index);        else            m_tag_array->access(block_addr,time,cache_index,wb,evicted);        m_mshrs.add(block_addr,mf);        m_extra_mf_fields[mf] = extra_mf_fields(block_addr,cache_index, mf->get_data_size());        mf->set_data_size( m_config.get_line_sz() );        m_miss_queue.push_back(mf);        mf->set_status(m_miss_queue_status,time);        if(!wa)            events.push_back(READ_REQUEST_SENT);        do_miss = true;    }}

3.向下级 cache or memory 发送写请求

/// Sends write request to lower level memory (write or writeback)void data_cache::send_write_request(mem_fetch *mf, cache_event request, unsigned time, std::list<cache_event> &events){    events.push_back(request);    m_miss_queue.push_back(mf);    mf->set_status(m_miss_queue_status,time);}

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