gem5/src/mem/ruby/system/SparseMemory.cc

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/*
* Copyright (c) 2009 Advanced Micro Devices, Inc.
* Copyright (c) 2012 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.
*/
#include <queue>
#include "debug/RubyCache.hh"
#include "mem/ruby/system/SparseMemory.hh"
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#include "mem/ruby/system/System.hh"
using namespace std;
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SparseMemory::SparseMemory(int number_of_levels)
{
int even_level_bits;
int extra;
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m_total_number_of_bits = RubySystem::getMemorySizeBits()
- RubySystem::getBlockSizeBits();;
m_number_of_levels = number_of_levels;
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//
// Create the array that describes the bits per level
//
m_number_of_bits_per_level = new int[m_number_of_levels];
even_level_bits = m_total_number_of_bits / m_number_of_levels;
extra = m_total_number_of_bits % m_number_of_levels;
for (int level = 0; level < m_number_of_levels; level++) {
if (level < extra)
m_number_of_bits_per_level[level] = even_level_bits + 1;
else
m_number_of_bits_per_level[level] = even_level_bits;
}
m_map_head = new SparseMapType;
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m_total_adds = 0;
m_total_removes = 0;
m_adds_per_level = new uint64_t[m_number_of_levels];
m_removes_per_level = new uint64_t[m_number_of_levels];
for (int level = 0; level < m_number_of_levels; level++) {
m_adds_per_level[level] = 0;
m_removes_per_level[level] = 0;
}
}
SparseMemory::~SparseMemory()
{
recursivelyRemoveTables(m_map_head, 0);
delete m_map_head;
delete [] m_number_of_bits_per_level;
delete [] m_adds_per_level;
delete [] m_removes_per_level;
}
// Recursively search table hierarchy for the lowest level table.
// Delete the lowest table first, the tables above
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void
SparseMemory::recursivelyRemoveTables(SparseMapType* curTable, int curLevel)
{
SparseMapType::iterator iter;
for (iter = curTable->begin(); iter != curTable->end(); iter++) {
SparseMemEntry entry = (*iter).second;
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if (curLevel != (m_number_of_levels - 1)) {
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// If the not at the last level, analyze those lower level
// tables first, then delete those next tables
SparseMapType* nextTable = (SparseMapType*)(entry);
recursivelyRemoveTables(nextTable, (curLevel + 1));
delete nextTable;
} else {
// If at the last level, delete the directory entry
delete (AbstractEntry*)(entry);
}
entry = NULL;
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}
// Once all entries have been deleted, erase the entries
curTable->erase(curTable->begin(), curTable->end());
}
// tests to see if an address is present in the memory
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bool
SparseMemory::exist(const Address& address) const
{
SparseMapType* curTable = m_map_head;
Address curAddress;
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// Initiallize the high bit to be the total number of bits plus
// the block offset. However the highest bit index is one less
// than this value.
int highBit = m_total_number_of_bits + RubySystem::getBlockSizeBits();
int lowBit;
assert(address == line_address(address));
DPRINTF(RubyCache, "address: %s\n", address);
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for (int level = 0; level < m_number_of_levels; level++) {
// Create the appropriate sub address for this level
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// Note: that set Address is inclusive of the specified range,
// thus the high bit is one less than the total number of bits
// used to create the address.
lowBit = highBit - m_number_of_bits_per_level[level];
curAddress.setAddress(address.bitSelect(lowBit, highBit - 1));
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DPRINTF(RubyCache, "level: %d, lowBit: %d, highBit - 1: %d, "
"curAddress: %s\n",
level, lowBit, highBit - 1, curAddress);
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// Adjust the highBit value for the next level
highBit -= m_number_of_bits_per_level[level];
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// If the address is found, move on to the next level.
// Otherwise, return not found
if (curTable->count(curAddress) != 0) {
curTable = (SparseMapType*)((*curTable)[curAddress]);
} else {
DPRINTF(RubyCache, "Not found\n");
return false;
}
}
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DPRINTF(RubyCache, "Entry found\n");
return true;
}
// add an address to memory
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void
SparseMemory::add(const Address& address, AbstractEntry* entry)
{
assert(address == line_address(address));
assert(!exist(address));
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m_total_adds++;
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Address curAddress;
SparseMapType* curTable = m_map_head;
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// Initiallize the high bit to be the total number of bits plus
// the block offset. However the highest bit index is one less
// than this value.
int highBit = m_total_number_of_bits + RubySystem::getBlockSizeBits();
int lowBit;
void* newEntry = NULL;
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for (int level = 0; level < m_number_of_levels; level++) {
// create the appropriate address for this level
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// Note: that set Address is inclusive of the specified range,
// thus the high bit is one less than the total number of bits
// used to create the address.
lowBit = highBit - m_number_of_bits_per_level[level];
curAddress.setAddress(address.bitSelect(lowBit, highBit - 1));
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// Adjust the highBit value for the next level
highBit -= m_number_of_bits_per_level[level];
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// if the address exists in the cur table, move on. Otherwise
// create a new table.
if (curTable->count(curAddress) != 0) {
curTable = (SparseMapType*)((*curTable)[curAddress]);
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} else {
m_adds_per_level[level]++;
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// if the last level, add a directory entry. Otherwise add a map.
if (level == (m_number_of_levels - 1)) {
entry->getDataBlk().clear();
newEntry = (void*)entry;
} else {
SparseMapType* tempMap = new SparseMapType;
newEntry = (void*)(tempMap);
}
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// Create the pointer container SparseMemEntry and add it
// to the table.
(*curTable)[curAddress] = newEntry;
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// Move to the next level of the heirarchy
curTable = (SparseMapType*)newEntry;
}
}
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assert(exist(address));
return;
}
// recursively search table hierarchy for the lowest level table.
// remove the lowest entry and any empty tables above it.
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int
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SparseMemory::recursivelyRemoveLevels(const Address& address,
CurNextInfo& curInfo)
{
Address curAddress;
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CurNextInfo nextInfo;
SparseMemEntry entry;
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// create the appropriate address for this level
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// Note: that set Address is inclusive of the specified range,
// thus the high bit is one less than the total number of bits
// used to create the address.
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curAddress.setAddress(address.bitSelect(curInfo.lowBit,
curInfo.highBit - 1));
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DPRINTF(RubyCache, "address: %s, curInfo.level: %d, curInfo.lowBit: %d, "
"curInfo.highBit - 1: %d, curAddress: %s\n",
address, curInfo.level, curInfo.lowBit,
curInfo.highBit - 1, curAddress);
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assert(curInfo.curTable->count(curAddress) != 0);
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entry = (*(curInfo.curTable))[curAddress];
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if (curInfo.level < (m_number_of_levels - 1)) {
// set up next level's info
nextInfo.curTable = (SparseMapType*)(entry);
nextInfo.level = curInfo.level + 1;
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nextInfo.highBit = curInfo.highBit -
m_number_of_bits_per_level[curInfo.level];
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nextInfo.lowBit = curInfo.lowBit -
m_number_of_bits_per_level[curInfo.level + 1];
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// recursively search the table hierarchy
int tableSize = recursivelyRemoveLevels(address, nextInfo);
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// If this table below is now empty, we must delete it and
// erase it from our table.
if (tableSize == 0) {
m_removes_per_level[curInfo.level]++;
delete nextInfo.curTable;
entry = NULL;
curInfo.curTable->erase(curAddress);
}
} else {
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// if this is the last level, we have reached the Directory
// Entry and thus we should delete it including the
// SparseMemEntry container struct.
delete (AbstractEntry*)(entry);
entry = NULL;
curInfo.curTable->erase(curAddress);
m_removes_per_level[curInfo.level]++;
}
return curInfo.curTable->size();
}
// remove an entry from the table
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void
SparseMemory::remove(const Address& address)
{
assert(address == line_address(address));
assert(exist(address));
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m_total_removes++;
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CurNextInfo nextInfo;
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// Initialize table pointer and level value
nextInfo.curTable = m_map_head;
nextInfo.level = 0;
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// Initiallize the high bit to be the total number of bits plus
// the block offset. However the highest bit index is one less
// than this value.
nextInfo.highBit = m_total_number_of_bits + RubySystem::getBlockSizeBits();
nextInfo.lowBit = nextInfo.highBit - m_number_of_bits_per_level[0];;
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// recursively search the table hierarchy for empty tables
// starting from the level 0. Note we do not check the return
// value because the head table is never deleted;
recursivelyRemoveLevels(address, nextInfo);
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assert(!exist(address));
return;
}
// looks an address up in memory
AbstractEntry*
SparseMemory::lookup(const Address& address)
{
assert(address == line_address(address));
Address curAddress;
SparseMapType* curTable = m_map_head;
AbstractEntry* entry = NULL;
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// Initiallize the high bit to be the total number of bits plus
// the block offset. However the highest bit index is one less
// than this value.
int highBit = m_total_number_of_bits + RubySystem::getBlockSizeBits();
int lowBit;
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for (int level = 0; level < m_number_of_levels; level++) {
// create the appropriate address for this level
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// Note: that set Address is inclusive of the specified range,
// thus the high bit is one less than the total number of bits
// used to create the address.
lowBit = highBit - m_number_of_bits_per_level[level];
curAddress.setAddress(address.bitSelect(lowBit, highBit - 1));
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DPRINTF(RubyCache, "level: %d, lowBit: %d, highBit - 1: %d, "
"curAddress: %s\n",
level, lowBit, highBit - 1, curAddress);
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// Adjust the highBit value for the next level
highBit -= m_number_of_bits_per_level[level];
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// If the address is found, move on to the next level.
// Otherwise, return not found
if (curTable->count(curAddress) != 0) {
curTable = (SparseMapType*)((*curTable)[curAddress]);
} else {
DPRINTF(RubyCache, "Not found\n");
return NULL;
}
}
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// The last entry actually points to the Directory entry not a table
entry = (AbstractEntry*)curTable;
return entry;
}
void
SparseMemory::recordBlocks(int cntrl_id, CacheRecorder* tr) const
{
queue<SparseMapType*> unexplored_nodes[2];
queue<physical_address_t> address_of_nodes[2];
unexplored_nodes[0].push(m_map_head);
address_of_nodes[0].push(0);
int parity_of_level = 0;
physical_address_t address, temp_address;
Address curAddress;
// Initiallize the high bit to be the total number of bits plus
// the block offset. However the highest bit index is one less
// than this value.
int highBit = m_total_number_of_bits + RubySystem::getBlockSizeBits();
int lowBit;
for (int cur_level = 0; cur_level < m_number_of_levels; cur_level++) {
// create the appropriate address for this level
// Note: that set Address is inclusive of the specified range,
// thus the high bit is one less than the total number of bits
// used to create the address.
lowBit = highBit - m_number_of_bits_per_level[cur_level];
while (!unexplored_nodes[parity_of_level].empty()) {
SparseMapType* node = unexplored_nodes[parity_of_level].front();
unexplored_nodes[parity_of_level].pop();
address = address_of_nodes[parity_of_level].front();
address_of_nodes[parity_of_level].pop();
SparseMapType::iterator iter;
for (iter = node->begin(); iter != node->end(); iter++) {
SparseMemEntry entry = (*iter).second;
curAddress = (*iter).first;
if (cur_level != (m_number_of_levels - 1)) {
// If not at the last level, put this node in the queue
unexplored_nodes[1 - parity_of_level].push(
(SparseMapType*)(entry));
address_of_nodes[1 - parity_of_level].push(address |
(curAddress.getAddress() << lowBit));
} else {
// If at the last level, add a trace record
temp_address = address | (curAddress.getAddress()
<< lowBit);
DataBlock block = ((AbstractEntry*)entry)->getDataBlk();
tr->addRecord(cntrl_id, temp_address, 0, RubyRequestType_ST, 0,
block);
}
}
}
// Adjust the highBit value for the next level
highBit -= m_number_of_bits_per_level[cur_level];
parity_of_level = 1 - parity_of_level;
}
}
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void
SparseMemory::print(ostream& out) const
{
}
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void
SparseMemory::printStats(ostream& out) const
{
out << "total_adds: " << m_total_adds << " [";
for (int level = 0; level < m_number_of_levels; level++) {
out << m_adds_per_level[level] << " ";
}
out << "]" << endl;
out << "total_removes: " << m_total_removes << " [";
for (int level = 0; level < m_number_of_levels; level++) {
out << m_removes_per_level[level] << " ";
}
out << "]" << endl;
}