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Diffstat (limited to 'src/mem/ruby/structures/PersistentTable.cc')
-rw-r--r-- | src/mem/ruby/structures/PersistentTable.cc | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/src/mem/ruby/structures/PersistentTable.cc b/src/mem/ruby/structures/PersistentTable.cc new file mode 100644 index 000000000..57b06946e --- /dev/null +++ b/src/mem/ruby/structures/PersistentTable.cc @@ -0,0 +1,219 @@ +/* + * 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. + */ + +#include "mem/ruby/structures/PersistentTable.hh" + +using namespace std; + +// randomize so that handoffs are not locality-aware +#if 0 +int persistent_randomize[] = {0, 4, 8, 12, 1, 5, 9, 13, 2, 6, + 10, 14, 3, 7, 11, 15}; +int persistent_randomize[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + 10, 11, 12, 13, 14, 15}; +#endif + +PersistentTable::PersistentTable() +{ +} + +PersistentTable::~PersistentTable() +{ +} + +void +PersistentTable::persistentRequestLock(const Address& address, + MachineID locker, + AccessType type) +{ +#if 0 + if (locker == m_chip_ptr->getID()) + cout << "Chip " << m_chip_ptr->getID() << ": " << llocker + << " requesting lock for " << address << endl; + + MachineID locker = (MachineID) persistent_randomize[llocker]; +#endif + + assert(address == line_address(address)); + + static const PersistentTableEntry dflt; + pair<AddressMap::iterator, bool> r = + m_map.insert(AddressMap::value_type(address, dflt)); + bool present = !r.second; + AddressMap::iterator i = r.first; + PersistentTableEntry &entry = i->second; + + if (present) { + // Make sure we're not already in the locked set + assert(!(entry.m_starving.isElement(locker))); + } + + entry.m_starving.add(locker); + if (type == AccessType_Write) + entry.m_request_to_write.add(locker); + + if (present) + assert(entry.m_marked.isSubset(entry.m_starving)); +} + +void +PersistentTable::persistentRequestUnlock(const Address& address, + MachineID unlocker) +{ +#if 0 + if (unlocker == m_chip_ptr->getID()) + cout << "Chip " << m_chip_ptr->getID() << ": " << uunlocker + << " requesting unlock for " << address << endl; + + MachineID unlocker = (MachineID) persistent_randomize[uunlocker]; +#endif + + assert(address == line_address(address)); + assert(m_map.count(address)); + PersistentTableEntry& entry = m_map[address]; + + // + // Make sure we're in the locked set + // + assert(entry.m_starving.isElement(unlocker)); + assert(entry.m_marked.isSubset(entry.m_starving)); + entry.m_starving.remove(unlocker); + entry.m_marked.remove(unlocker); + entry.m_request_to_write.remove(unlocker); + assert(entry.m_marked.isSubset(entry.m_starving)); + + // Deallocate if empty + if (entry.m_starving.isEmpty()) { + assert(entry.m_marked.isEmpty()); + m_map.erase(address); + } +} + +bool +PersistentTable::okToIssueStarving(const Address& address, + MachineID machId) const +{ + assert(address == line_address(address)); + + AddressMap::const_iterator i = m_map.find(address); + if (i == m_map.end()) { + // No entry present + return true; + } + + const PersistentTableEntry &entry = i->second; + + if (entry.m_starving.isElement(machId)) { + // We can't issue another lockdown until are previous unlock + // has occurred + return false; + } + + return entry.m_marked.isEmpty(); +} + +MachineID +PersistentTable::findSmallest(const Address& address) const +{ + assert(address == line_address(address)); + AddressMap::const_iterator i = m_map.find(address); + assert(i != m_map.end()); + const PersistentTableEntry& entry = i->second; + return entry.m_starving.smallestElement(); +} + +AccessType +PersistentTable::typeOfSmallest(const Address& address) const +{ + assert(address == line_address(address)); + AddressMap::const_iterator i = m_map.find(address); + assert(i != m_map.end()); + const PersistentTableEntry& entry = i->second; + if (entry.m_request_to_write. + isElement(entry.m_starving.smallestElement())) { + return AccessType_Write; + } else { + return AccessType_Read; + } +} + +void +PersistentTable::markEntries(const Address& address) +{ + assert(address == line_address(address)); + AddressMap::iterator i = m_map.find(address); + if (i == m_map.end()) + return; + + PersistentTableEntry& entry = i->second; + + // None should be marked + assert(entry.m_marked.isEmpty()); + + // Mark all the nodes currently in the table + entry.m_marked = entry.m_starving; +} + +bool +PersistentTable::isLocked(const Address& address) const +{ + assert(address == line_address(address)); + + // If an entry is present, it must be locked + return m_map.count(address) > 0; +} + +int +PersistentTable::countStarvingForAddress(const Address& address) const +{ + assert(address == line_address(address)); + AddressMap::const_iterator i = m_map.find(address); + if (i == m_map.end()) + return 0; + + const PersistentTableEntry& entry = i->second; + return entry.m_starving.count(); +} + +int +PersistentTable::countReadStarvingForAddress(const Address& address) const +{ + assert(address == line_address(address)); + AddressMap::const_iterator i = m_map.find(address); + if (i == m_map.end()) + return 0; + + const PersistentTableEntry& entry = i->second; + return entry.m_starving.count() - entry.m_request_to_write.count(); +} + +void +PersistentTable::print(ostream& out) const +{ +} + |