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Diffstat (limited to 'src/mem/cache/tags/iic_repl/gen.hh')
| -rw-r--r-- | src/mem/cache/tags/iic_repl/gen.hh | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/src/mem/cache/tags/iic_repl/gen.hh b/src/mem/cache/tags/iic_repl/gen.hh deleted file mode 100644 index 2e817d847..000000000 --- a/src/mem/cache/tags/iic_repl/gen.hh +++ /dev/null @@ -1,234 +0,0 @@ -/* - * Copyright (c) 2002-2005 The Regents of The University of Michigan - * 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. - * - * Authors: Erik Hallnor - */ - -/** - * @file - * Declarations of generational replacement policy - */ - -#ifndef ___GEN_HH__ -#define __GEN_HH__ - -#include <list> - -#include "base/statistics.hh" -#include "mem/cache/tags/iic_repl/repl.hh" -#include "params/GenRepl.hh" - -/** - * Generational Replacement entry. - */ -class GenReplEntry -{ - public: - /** Valid flag, used to quickly invalidate bogus entries. */ - bool valid; - /** The difference between this entry and the previous in the pool. */ - int delta; - /** Pointer to the corresponding tag in the IIC. */ - unsigned long tag_ptr; -}; - -/** - * Generational replacement pool - */ -class GenPool -{ - public: - /** The time the last entry was added. */ - Tick newest; - /** The time the oldest entry was added. */ - Tick oldest; - /** List of the replacement entries in this pool. */ - std::list<GenReplEntry*> entries; - - /** The number of entries in this pool. */ - int size; - - /** - * Simple constructor. - */ - GenPool() { - newest = 0; - oldest = 0; - size = 0; - } - - /** - * Add an entry to this pool. - * @param re The entry to add. - * @param now The current time. - */ - void push(GenReplEntry *re, Tick now) { - ++size; - if (!entries.empty()) { - re->delta = now - newest; - newest = now; - } else { - re->delta = 0; - newest = oldest = now; - } - entries.push_back(re); - } - - /** - * Remove an entry from the pool. - * @return The entry at the front of the list. - */ - GenReplEntry* pop() { - GenReplEntry *tmp = NULL; - if (!entries.empty()) { - --size; - tmp = entries.front(); - entries.pop_front(); - oldest += tmp->delta; - } - return tmp; - } - - /** - * Return the entry at the front of the list. - * @return the entry at the front of the list. - */ - GenReplEntry* top() { - return entries.front(); - } - - /** - * Destructor. - */ - ~GenPool() { - while (!entries.empty()) { - GenReplEntry *tmp = entries.front(); - entries.pop_front(); - delete tmp; - } - } -}; - -/** - * Generational replacement policy for use with the IIC. - * @todo update to use STL and for efficiency - */ -class GenRepl : public Repl -{ - public: - /** The number of pools. */ - int num_pools; - /** The amount of time to stay in the fresh pool. */ - int fresh_res; - /** The amount of time to stay in the normal pools. */ - int pool_res; - /** The maximum number of entries */ - int num_entries; - /** The number of entries currently in the pools. */ - int num_pool_entries; - /** The number of misses. Used as the internal time. */ - Tick misses; - /** The array of pools. */ - GenPool *pools; - - // Statistics - - /** - * @addtogroup CacheStatistics - * @{ - */ - /** The number of replacements from each pool. */ - Stats::Distribution repl_pool; - /** The number of advances out of each pool. */ - Stats::Distribution advance_pool; - /** The number of demotions from each pool. */ - Stats::Distribution demote_pool; - /** - * @} - */ - - typedef GenReplParams Params; - GenRepl(const Params *p); - - /** - * Destructor. - */ - ~GenRepl(); - - /** - * Returns the tag pointer of the cache block to replace. - * @return The tag to replace. - */ - virtual unsigned long getRepl(); - - /** - * Update replacement data - */ - virtual void doAdvance(std::list<unsigned long> &demoted); - - /** - * Add a tag to the replacement policy and return a pointer to the - * replacement entry. - * @param tag_index The tag to add. - * @return The replacement entry. - */ - virtual void* add(unsigned long tag_index); - - /** - * Register statistics. - * @param name The name to prepend to statistic descriptions. - */ - virtual void regStatsWithSuffix(const std::string name); - - /** - * Update the tag pointer to when the tag moves. - * @param re The replacement entry of the tag. - * @param old_index The old tag pointer. - * @param new_index The new tag pointer. - * @return 1 if successful, 0 otherwise. - */ - virtual int fixTag(void *re, unsigned long old_index, - unsigned long new_index); - - /** - * Remove this entry from the replacement policy. - * @param re The replacement entry to remove - */ - virtual void removeEntry(void *re) - { - ((GenReplEntry*)re)->valid = false; - } - - protected: - /** - * Debug function to verify that there is only one repl entry per tag. - * @param index The tag index to check. - */ - bool findTagPtr(unsigned long index); -}; - -#endif /* __GEN_HH__ */ |