| # Copyright (c) 2012, 2014 ARM Limited |
| # All rights reserved. |
| # |
| # The license below extends only to copyright in the software and shall |
| # not be construed as granting a license to any other intellectual |
| # property including but not limited to intellectual property relating |
| # to a hardware implementation of the functionality of the software |
| # licensed hereunder. You may use the software subject to the license |
| # terms below provided that you ensure that this notice is replicated |
| # unmodified and in its entirety in all distributions of the software, |
| # modified or unmodified, in source code or in binary form. |
| # |
| # Copyright (c) 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: Ron Dreslinski |
| # Mitch Hayenga |
| |
| from m5.SimObject import * |
| from m5.params import * |
| from m5.proxy import * |
| |
| from m5.objects.ClockedObject import ClockedObject |
| from m5.objects.IndexingPolicies import * |
| from m5.objects.ReplacementPolicies import * |
| |
| class HWPProbeEvent(object): |
| def __init__(self, prefetcher, obj, *listOfNames): |
| self.obj = obj |
| self.prefetcher = prefetcher |
| self.names = listOfNames |
| |
| def register(self): |
| if self.obj: |
| for name in self.names: |
| self.prefetcher.getCCObject().addEventProbe( |
| self.obj.getCCObject(), name) |
| |
| class BasePrefetcher(ClockedObject): |
| type = 'BasePrefetcher' |
| abstract = True |
| cxx_header = "mem/cache/prefetch/base.hh" |
| cxx_exports = [ |
| PyBindMethod("addEventProbe"), |
| ] |
| sys = Param.System(Parent.any, "System this prefetcher belongs to") |
| |
| # Get the block size from the parent (system) |
| block_size = Param.Int(Parent.cache_line_size, "Block size in bytes") |
| |
| on_miss = Param.Bool(False, "Only notify prefetcher on misses") |
| on_read = Param.Bool(True, "Notify prefetcher on reads") |
| on_write = Param.Bool(True, "Notify prefetcher on writes") |
| on_data = Param.Bool(True, "Notify prefetcher on data accesses") |
| on_inst = Param.Bool(True, "Notify prefetcher on instruction accesses") |
| prefetch_on_access = Param.Bool(Parent.prefetch_on_access, |
| "Notify the hardware prefetcher on every access (not just misses)") |
| use_virtual_addresses = Param.Bool(False, |
| "Use virtual addresses for prefetching") |
| |
| _events = [] |
| def addEvent(self, newObject): |
| self._events.append(newObject) |
| |
| # Override the normal SimObject::regProbeListeners method and |
| # register deferred event handlers. |
| def regProbeListeners(self): |
| for event in self._events: |
| event.register() |
| self.getCCObject().regProbeListeners() |
| |
| def listenFromProbe(self, simObj, *probeNames): |
| if not isinstance(simObj, SimObject): |
| raise TypeError("argument must be of SimObject type") |
| if len(probeNames) <= 0: |
| raise TypeError("probeNames must have at least one element") |
| self.addEvent(HWPProbeEvent(self, simObj, *probeNames)) |
| |
| class QueuedPrefetcher(BasePrefetcher): |
| type = "QueuedPrefetcher" |
| abstract = True |
| cxx_class = "QueuedPrefetcher" |
| cxx_header = "mem/cache/prefetch/queued.hh" |
| latency = Param.Int(1, "Latency for generated prefetches") |
| queue_size = Param.Int(32, "Maximum number of queued prefetches") |
| queue_squash = Param.Bool(True, "Squash queued prefetch on demand access") |
| queue_filter = Param.Bool(True, "Don't queue redundant prefetches") |
| cache_snoop = Param.Bool(False, "Snoop cache to eliminate redundant request") |
| |
| tag_prefetch = Param.Bool(True, "Tag prefetch with PC of generating access") |
| |
| class StridePrefetcher(QueuedPrefetcher): |
| type = 'StridePrefetcher' |
| cxx_class = 'StridePrefetcher' |
| cxx_header = "mem/cache/prefetch/stride.hh" |
| |
| # Do not consult stride prefetcher on instruction accesses |
| on_inst = False |
| |
| max_conf = Param.Int(7, "Maximum confidence level") |
| thresh_conf = Param.Int(4, "Threshold confidence level") |
| min_conf = Param.Int(0, "Minimum confidence level") |
| start_conf = Param.Int(4, "Starting confidence for new entries") |
| |
| table_sets = Param.Int(16, "Number of sets in PC lookup table") |
| table_assoc = Param.Int(4, "Associativity of PC lookup table") |
| use_master_id = Param.Bool(True, "Use master id based history") |
| |
| degree = Param.Int(4, "Number of prefetches to generate") |
| |
| # Get replacement policy |
| replacement_policy = Param.BaseReplacementPolicy(RandomRP(), |
| "Replacement policy") |
| |
| class TaggedPrefetcher(QueuedPrefetcher): |
| type = 'TaggedPrefetcher' |
| cxx_class = 'TaggedPrefetcher' |
| cxx_header = "mem/cache/prefetch/tagged.hh" |
| |
| degree = Param.Int(2, "Number of prefetches to generate") |
| |
| class SignaturePathPrefetcher(QueuedPrefetcher): |
| type = 'SignaturePathPrefetcher' |
| cxx_class = 'SignaturePathPrefetcher' |
| cxx_header = "mem/cache/prefetch/signature_path.hh" |
| |
| signature_shift = Param.UInt8(3, |
| "Number of bits to shift when calculating a new signature"); |
| signature_bits = Param.UInt16(12, |
| "Size of the signature, in bits"); |
| signature_table_entries = Param.MemorySize("1024", |
| "Number of entries of the signature table") |
| signature_table_assoc = Param.Unsigned(2, |
| "Associativity of the signature table") |
| signature_table_indexing_policy = Param.BaseIndexingPolicy( |
| SetAssociative(entry_size = 1, assoc = Parent.signature_table_assoc, |
| size = Parent.signature_table_entries), |
| "Indexing policy of the signature table") |
| signature_table_replacement_policy = Param.BaseReplacementPolicy(LRURP(), |
| "Replacement policy of the signature table") |
| |
| max_counter_value = Param.UInt8(7, "Maximum pattern counter value") |
| pattern_table_entries = Param.MemorySize("4096", |
| "Number of entries of the pattern table") |
| pattern_table_assoc = Param.Unsigned(1, |
| "Associativity of the pattern table") |
| strides_per_pattern_entry = Param.Unsigned(4, |
| "Number of strides stored in each pattern entry") |
| pattern_table_indexing_policy = Param.BaseIndexingPolicy( |
| SetAssociative(entry_size = 1, assoc = Parent.pattern_table_assoc, |
| size = Parent.pattern_table_entries), |
| "Indexing policy of the pattern table") |
| pattern_table_replacement_policy = Param.BaseReplacementPolicy(LRURP(), |
| "Replacement policy of the pattern table") |
| |
| prefetch_confidence_threshold = Param.Float(0.5, |
| "Minimum confidence to issue prefetches") |
| lookahead_confidence_threshold = Param.Float(0.75, |
| "Minimum confidence to continue exploring lookahead entries") |
| |
| class SignaturePathPrefetcherV2(SignaturePathPrefetcher): |
| type = 'SignaturePathPrefetcherV2' |
| cxx_class = 'SignaturePathPrefetcherV2' |
| cxx_header = "mem/cache/prefetch/signature_path_v2.hh" |
| |
| signature_table_entries = "256" |
| signature_table_assoc = 1 |
| pattern_table_entries = "512" |
| pattern_table_assoc = 1 |
| max_counter_value = 15 |
| prefetch_confidence_threshold = 0.25 |
| lookahead_confidence_threshold = 0.25 |
| |
| global_history_register_entries = Param.MemorySize("8", |
| "Number of entries of global history register") |
| global_history_register_indexing_policy = Param.BaseIndexingPolicy( |
| SetAssociative(entry_size = 1, |
| assoc = Parent.global_history_register_entries, |
| size = Parent.global_history_register_entries), |
| "Indexing policy of the global history register") |
| global_history_register_replacement_policy = Param.BaseReplacementPolicy( |
| LRURP(), "Replacement policy of the global history register") |
| |
| class AccessMapPatternMatching(ClockedObject): |
| type = 'AccessMapPatternMatching' |
| cxx_class = 'AccessMapPatternMatching' |
| cxx_header = "mem/cache/prefetch/access_map_pattern_matching.hh" |
| |
| block_size = Param.Unsigned(Parent.block_size, |
| "Cacheline size used by the prefetcher using this object") |
| |
| limit_stride = Param.Unsigned(0, |
| "Limit the strides checked up to -X/X, if 0, disable the limit") |
| start_degree = Param.Unsigned(4, |
| "Initial degree (Maximum number of prefetches generated") |
| hot_zone_size = Param.MemorySize("2kB", "Memory covered by a hot zone") |
| access_map_table_entries = Param.MemorySize("256", |
| "Number of entries in the access map table") |
| access_map_table_assoc = Param.Unsigned(8, |
| "Associativity of the access map table") |
| access_map_table_indexing_policy = Param.BaseIndexingPolicy( |
| SetAssociative(entry_size = 1, assoc = Parent.access_map_table_assoc, |
| size = Parent.access_map_table_entries), |
| "Indexing policy of the access map table") |
| access_map_table_replacement_policy = Param.BaseReplacementPolicy(LRURP(), |
| "Replacement policy of the access map table") |
| high_coverage_threshold = Param.Float(0.25, |
| "A prefetch coverage factor bigger than this is considered high") |
| low_coverage_threshold = Param.Float(0.125, |
| "A prefetch coverage factor smaller than this is considered low") |
| high_accuracy_threshold = Param.Float(0.5, |
| "A prefetch accuracy factor bigger than this is considered high") |
| low_accuracy_threshold = Param.Float(0.25, |
| "A prefetch accuracy factor smaller than this is considered low") |
| high_cache_hit_threshold = Param.Float(0.875, |
| "A cache hit ratio bigger than this is considered high") |
| low_cache_hit_threshold = Param.Float(0.75, |
| "A cache hit ratio smaller than this is considered low") |
| epoch_cycles = Param.Cycles(256000, "Cycles in an epoch period") |
| offchip_memory_latency = Param.Latency("30ns", |
| "Memory latency used to compute the required memory bandwidth") |
| |
| class AMPMPrefetcher(QueuedPrefetcher): |
| type = 'AMPMPrefetcher' |
| cxx_class = 'AMPMPrefetcher' |
| cxx_header = "mem/cache/prefetch/access_map_pattern_matching.hh" |
| ampm = Param.AccessMapPatternMatching( AccessMapPatternMatching(), |
| "Access Map Pattern Matching object") |
| |
| class DeltaCorrelatingPredictionTables(SimObject): |
| type = 'DeltaCorrelatingPredictionTables' |
| cxx_class = 'DeltaCorrelatingPredictionTables' |
| cxx_header = "mem/cache/prefetch/delta_correlating_prediction_tables.hh" |
| deltas_per_entry = Param.Unsigned(20, |
| "Number of deltas stored in each table entry") |
| delta_bits = Param.Unsigned(12, "Bits per delta") |
| delta_mask_bits = Param.Unsigned(8, |
| "Lower bits to mask when comparing deltas") |
| table_entries = Param.MemorySize("128", |
| "Number of entries in the table") |
| table_assoc = Param.Unsigned(128, |
| "Associativity of the table") |
| table_indexing_policy = Param.BaseIndexingPolicy( |
| SetAssociative(entry_size = 1, assoc = Parent.table_assoc, |
| size = Parent.table_entries), |
| "Indexing policy of the table") |
| table_replacement_policy = Param.BaseReplacementPolicy(LRURP(), |
| "Replacement policy of the table") |
| |
| class DCPTPrefetcher(QueuedPrefetcher): |
| type = 'DCPTPrefetcher' |
| cxx_class = 'DCPTPrefetcher' |
| cxx_header = "mem/cache/prefetch/delta_correlating_prediction_tables.hh" |
| dcpt = Param.DeltaCorrelatingPredictionTables( |
| DeltaCorrelatingPredictionTables(), |
| "Delta Correlating Prediction Tables object") |
| |
| class IrregularStreamBufferPrefetcher(QueuedPrefetcher): |
| type = "IrregularStreamBufferPrefetcher" |
| cxx_class = "IrregularStreamBufferPrefetcher" |
| cxx_header = "mem/cache/prefetch/irregular_stream_buffer.hh" |
| |
| max_counter_value = Param.Unsigned(3, |
| "Maximum value of the confidence counter") |
| chunk_size = Param.Unsigned(256, |
| "Maximum number of addresses in a temporal stream") |
| degree = Param.Unsigned(4, "Number of prefetches to generate") |
| training_unit_assoc = Param.Unsigned(128, |
| "Associativity of the training unit") |
| training_unit_entries = Param.MemorySize("128", |
| "Number of entries of the training unit") |
| training_unit_indexing_policy = Param.BaseIndexingPolicy( |
| SetAssociative(entry_size = 1, assoc = Parent.training_unit_assoc, |
| size = Parent.training_unit_entries), |
| "Indexing policy of the training unit") |
| training_unit_replacement_policy = Param.BaseReplacementPolicy(LRURP(), |
| "Replacement policy of the training unit") |
| |
| prefetch_candidates_per_entry = Param.Unsigned(16, |
| "Number of prefetch candidates stored in a SP-AMC entry") |
| address_map_cache_assoc = Param.Unsigned(128, |
| "Associativity of the PS/SP AMCs") |
| address_map_cache_entries = Param.MemorySize("128", |
| "Number of entries of the PS/SP AMCs") |
| ps_address_map_cache_indexing_policy = Param.BaseIndexingPolicy( |
| SetAssociative(entry_size = 1, |
| assoc = Parent.address_map_cache_assoc, |
| size = Parent.address_map_cache_entries), |
| "Indexing policy of the Physical-to-Structural Address Map Cache") |
| ps_address_map_cache_replacement_policy = Param.BaseReplacementPolicy( |
| LRURP(), |
| "Replacement policy of the Physical-to-Structural Address Map Cache") |
| sp_address_map_cache_indexing_policy = Param.BaseIndexingPolicy( |
| SetAssociative(entry_size = 1, |
| assoc = Parent.address_map_cache_assoc, |
| size = Parent.address_map_cache_entries), |
| "Indexing policy of the Structural-to-Physical Address Mao Cache") |
| sp_address_map_cache_replacement_policy = Param.BaseReplacementPolicy( |
| LRURP(), |
| "Replacement policy of the Structural-to-Physical Address Map Cache") |
| |
| class SlimAccessMapPatternMatching(AccessMapPatternMatching): |
| start_degree = 2 |
| limit_stride = 4 |
| |
| class SlimDeltaCorrelatingPredictionTables(DeltaCorrelatingPredictionTables): |
| table_entries = "256" |
| table_assoc = 256 |
| deltas_per_entry = 9 |
| |
| class SlimAMPMPrefetcher(QueuedPrefetcher): |
| type = 'SlimAMPMPrefetcher' |
| cxx_class = 'SlimAMPMPrefetcher' |
| cxx_header = "mem/cache/prefetch/slim_ampm.hh" |
| |
| ampm = Param.AccessMapPatternMatching(SlimAccessMapPatternMatching(), |
| "Access Map Pattern Matching object") |
| dcpt = Param.DeltaCorrelatingPredictionTables( |
| SlimDeltaCorrelatingPredictionTables(), |
| "Delta Correlating Prediction Tables object") |
| |
| class BOPPrefetcher(QueuedPrefetcher): |
| type = "BOPPrefetcher" |
| cxx_class = "BOPPrefetcher" |
| cxx_header = "mem/cache/prefetch/bop.hh" |
| score_max = Param.Unsigned(31, "Max. score to update the best offset") |
| round_max = Param.Unsigned(100, "Max. round to update the best offset") |
| bad_score = Param.Unsigned(10, "Score at which the HWP is disabled") |
| rr_size = Param.Unsigned(64, "Number of entries of each RR bank") |
| tag_bits = Param.Unsigned(12, "Bits used to store the tag") |
| offset_list_size = Param.Unsigned(46, |
| "Number of entries in the offsets list") |
| negative_offsets_enable = Param.Bool(True, |
| "Initialize the offsets list also with negative values \ |
| (i.e. the table will have half of the entries with positive \ |
| offsets and the other half with negative ones)") |
| delay_queue_enable = Param.Bool(True, "Enable the delay queue") |
| delay_queue_size = Param.Unsigned(15, |
| "Number of entries in the delay queue") |
| delay_queue_cycles = Param.Cycles(60, |
| "Cycles to delay a write in the left RR table from the delay \ |
| queue") |
| |
| class SBOOEPrefetcher(QueuedPrefetcher): |
| type = 'SBOOEPrefetcher' |
| cxx_class = 'SBOOEPrefetcher' |
| cxx_header = "mem/cache/prefetch/sbooe.hh" |
| latency_buffer_size = Param.Int(32, "Entries in the latency buffer") |
| sequential_prefetchers = Param.Int(9, "Number of sequential prefetchers") |
| sandbox_entries = Param.Int(1024, "Size of the address buffer") |
| score_threshold_pct = Param.Percent(25, "Min. threshold to issue a \ |
| prefetch. The value is the percentage of sandbox entries to use") |
