From: Mrinmoy Ghosh Date: Sun, 12 Feb 2012 22:07:38 +0000 (-0600) Subject: prefetcher: Make prefetcher a sim object instead of it being a parameter on cache X-Git-Tag: stable_2012_06_28~242 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7e104a1af235823e3d641a972ea920937f7ec67d;p=gem5.git prefetcher: Make prefetcher a sim object instead of it being a parameter on cache --- diff --git a/configs/common/O3_ARM_v7a.py b/configs/common/O3_ARM_v7a.py index a2b769f27..68fb0c543 100644 --- a/configs/common/O3_ARM_v7a.py +++ b/configs/common/O3_ARM_v7a.py @@ -190,10 +190,7 @@ class O3_ARM_v7aL2(BaseCache): size = '1MB' assoc = 16 write_buffers = 8 - # Simple stride prefetcher - prefetch_policy = 'stride' prefetch_on_access = 'true' - prefetch_latency = '1.0ns' - prefetch_degree = 8 - + # Simple stride prefetcher + prefetcher = StridePrefetcher(degree=8, latency='1.0ns') diff --git a/src/mem/cache/BaseCache.py b/src/mem/cache/BaseCache.py index 5c7ae5274..e9e60859f 100644 --- a/src/mem/cache/BaseCache.py +++ b/src/mem/cache/BaseCache.py @@ -29,8 +29,8 @@ from m5.params import * from m5.proxy import Self from MemObject import MemObject +from Prefetcher import BasePrefetcher -class Prefetch(Enum): vals = ['none', 'tagged', 'stride', 'ghb'] class BaseCache(MemObject): type = 'BaseCache' @@ -58,22 +58,7 @@ class BaseCache(MemObject): write_buffers = Param.Int(8, "number of write buffers") prefetch_on_access = Param.Bool(False, "notify the hardware prefetcher on every access (not just misses)") - prefetcher_size = Param.Int(100, - "Number of entries in the hardware prefetch queue") - prefetch_past_page = Param.Bool(False, - "Allow prefetches to cross virtual page boundaries") - prefetch_serial_squash = Param.Bool(False, - "Squash prefetches with a later time on a subsequent miss") - prefetch_degree = Param.Int(1, - "Degree of the prefetch depth") - prefetch_latency = Param.Latency(10 * Self.latency, - "Latency of the prefetcher") - prefetch_policy = Param.Prefetch('none', - "Type of prefetcher to use") - prefetch_use_cpu_id = Param.Bool(True, - "Use the CPU ID to separate calculations of prefetches") - prefetch_data_accesses_only = Param.Bool(False, - "Only prefetch on data not on instruction accesses") + prefetcher = Param.BasePrefetcher(NULL,"Prefetcher attached to cache") cpu_side = Port("Port on side closer to CPU") mem_side = Port("Port on side closer to MEM") addr_range = Param.AddrRange(AllMemory, "The address range for the CPU-side port") diff --git a/src/mem/cache/builder.cc b/src/mem/cache/builder.cc index e2c14ef5b..cc206b784 100644 --- a/src/mem/cache/builder.cc +++ b/src/mem/cache/builder.cc @@ -37,7 +37,6 @@ #include #include "config/the_isa.hh" -#include "enums/Prefetch.hh" #include "mem/cache/base.hh" #include "mem/cache/cache.hh" #include "mem/config/cache.hh" @@ -57,30 +56,13 @@ #include "mem/cache/tags/iic.hh" #endif -//Prefetcher Headers -#include "mem/cache/prefetch/ghb.hh" -#include "mem/cache/prefetch/stride.hh" -#include "mem/cache/prefetch/tagged.hh" using namespace std; #define BUILD_CACHE(TAGS, tags) \ do { \ - BasePrefetcher *pf; \ - if (prefetch_policy == Enums::tagged) { \ - pf = new TaggedPrefetcher(this); \ - } \ - else if (prefetch_policy == Enums::stride) { \ - pf = new StridePrefetcher(this); \ - } \ - else if (prefetch_policy == Enums::ghb) { \ - pf = new GHBPrefetcher(this); \ - } \ - else { \ - pf = NULL; \ - } \ Cache *retval = \ - new Cache(this, tags, pf); \ + new Cache(this, tags); \ return retval; \ } while (0) diff --git a/src/mem/cache/cache.hh b/src/mem/cache/cache.hh index b5c95b301..b2569648e 100644 --- a/src/mem/cache/cache.hh +++ b/src/mem/cache/cache.hh @@ -211,7 +211,7 @@ class Cache : public BaseCache public: /** Instantiates a basic cache object. */ - Cache(const Params *p, TagStore *tags, BasePrefetcher *prefetcher); + Cache(const Params *p, TagStore *tags); virtual Port *getPort(const std::string &if_name, int idx = -1); diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh index 2ef53e040..16b5148dc 100644 --- a/src/mem/cache/cache_impl.hh +++ b/src/mem/cache/cache_impl.hh @@ -63,10 +63,10 @@ #include "sim/sim_exit.hh" template -Cache::Cache(const Params *p, TagStore *tags, BasePrefetcher *pf) +Cache::Cache(const Params *p, TagStore *tags) : BaseCache(p), tags(tags), - prefetcher(pf), + prefetcher(p->prefetcher), doFastWrites(true), prefetchOnAccess(p->prefetch_on_access) { @@ -89,8 +89,6 @@ Cache::regStats() { BaseCache::regStats(); tags->regStats(name()); - if (prefetcher) - prefetcher->regStats(name()); } template diff --git a/src/mem/cache/prefetch/Prefetcher.py b/src/mem/cache/prefetch/Prefetcher.py new file mode 100644 index 000000000..c2c17fa96 --- /dev/null +++ b/src/mem/cache/prefetch/Prefetcher.py @@ -0,0 +1,35 @@ +from m5.SimObject import SimObject +from m5.params import * +class BasePrefetcher(SimObject): + type = 'BasePrefetcher' + abstract = True + size = Param.Int(100, + "Number of entries in the hardware prefetch queue") + cross_pages = Param.Bool(False, + "Allow prefetches to cross virtual page boundaries") + serial_squash = Param.Bool(False, + "Squash prefetches with a later time on a subsequent miss") + degree = Param.Int(1, + "Degree of the prefetch depth") + latency = Param.Latency('10t', + "Latency of the prefetcher") + use_cpu_id = Param.Bool(True, + "Use the CPU ID to separate calculations of prefetches") + data_accesses_only = Param.Bool(False, + "Only prefetch on data not on instruction accesses") + +class GHBPrefetcher(BasePrefetcher): + type = 'GHBPrefetcher' + cxx_class = 'GHBPrefetcher' + +class StridePrefetcher(BasePrefetcher): + type = 'StridePrefetcher' + cxx_class = 'StridePrefetcher' + +class TaggedPrefetcher(BasePrefetcher): + type = 'TaggedPrefetcher' + cxx_class = 'TaggedPrefetcher' + + + + diff --git a/src/mem/cache/prefetch/SConscript b/src/mem/cache/prefetch/SConscript index 9d05a8ee4..2310940c1 100644 --- a/src/mem/cache/prefetch/SConscript +++ b/src/mem/cache/prefetch/SConscript @@ -32,6 +32,7 @@ Import('*') if env['TARGET_ISA'] == 'no': Return() +SimObject('Prefetcher.py') Source('base.cc') Source('ghb.cc') diff --git a/src/mem/cache/prefetch/base.cc b/src/mem/cache/prefetch/base.cc index 0f9290186..834787db6 100644 --- a/src/mem/cache/prefetch/base.cc +++ b/src/mem/cache/prefetch/base.cc @@ -43,10 +43,10 @@ #include "mem/cache/base.hh" #include "mem/request.hh" -BasePrefetcher::BasePrefetcher(const BaseCacheParams *p) - : size(p->prefetcher_size), pageStop(!p->prefetch_past_page), - serialSquash(p->prefetch_serial_squash), - onlyData(p->prefetch_data_accesses_only) +BasePrefetcher::BasePrefetcher(const Params *p) + : SimObject(p), size(p->size), latency(p->latency), degree(p->degree), + useContextId(p->use_cpu_id), pageStop(!p->cross_pages), + serialSquash(p->serial_squash), onlyData(p->data_accesses_only) { } @@ -55,54 +55,53 @@ BasePrefetcher::setCache(BaseCache *_cache) { cache = _cache; blkSize = cache->getBlockSize(); - _name = cache->name() + "-pf"; } void -BasePrefetcher::regStats(const std::string &name) +BasePrefetcher::regStats() { pfIdentified - .name(name + ".prefetcher.num_hwpf_identified") + .name(name() + ".prefetcher.num_hwpf_identified") .desc("number of hwpf identified") ; pfMSHRHit - .name(name + ".prefetcher.num_hwpf_already_in_mshr") + .name(name() + ".prefetcher.num_hwpf_already_in_mshr") .desc("number of hwpf that were already in mshr") ; pfCacheHit - .name(name + ".prefetcher.num_hwpf_already_in_cache") + .name(name() + ".prefetcher.num_hwpf_already_in_cache") .desc("number of hwpf that were already in the cache") ; pfBufferHit - .name(name + ".prefetcher.num_hwpf_already_in_prefetcher") + .name(name() + ".prefetcher.num_hwpf_already_in_prefetcher") .desc("number of hwpf that were already in the prefetch queue") ; pfRemovedFull - .name(name + ".prefetcher.num_hwpf_evicted") + .name(name() + ".prefetcher.num_hwpf_evicted") .desc("number of hwpf removed due to no buffer left") ; pfRemovedMSHR - .name(name + ".prefetcher.num_hwpf_removed_MSHR_hit") + .name(name() + ".prefetcher.num_hwpf_removed_MSHR_hit") .desc("number of hwpf removed because MSHR allocated") ; pfIssued - .name(name + ".prefetcher.num_hwpf_issued") + .name(name() + ".prefetcher.num_hwpf_issued") .desc("number of hwpf issued") ; pfSpanPage - .name(name + ".prefetcher.num_hwpf_span_page") + .name(name() + ".prefetcher.num_hwpf_span_page") .desc("number of hwpf spanning a virtual page") ; pfSquashed - .name(name + ".prefetcher.num_hwpf_squashed_from_miss") + .name(name() + ".prefetcher.num_hwpf_squashed_from_miss") .desc("number of hwpf that got squashed due to a miss " "aborting calculation time") ; @@ -276,3 +275,5 @@ BasePrefetcher::samePage(Addr a, Addr b) { return roundDown(a, TheISA::VMPageSize) == roundDown(b, TheISA::VMPageSize); } + + diff --git a/src/mem/cache/prefetch/base.hh b/src/mem/cache/prefetch/base.hh index e3c0cbf16..ead163215 100644 --- a/src/mem/cache/prefetch/base.hh +++ b/src/mem/cache/prefetch/base.hh @@ -41,10 +41,11 @@ #include "base/statistics.hh" #include "mem/packet.hh" #include "params/BaseCache.hh" +#include "sim/sim_object.hh" class BaseCache; -class BasePrefetcher +class BasePrefetcher : public SimObject { protected: @@ -62,6 +63,14 @@ class BasePrefetcher /** The block size of the parent cache. */ int blkSize; + /** The latency before a prefetch is issued */ + Tick latency; + + /** The number of prefetches to issue */ + unsigned degree; + + /** If patterns should be found per context id */ + bool useContextId; /** Do we prefetch across page boundaries. */ bool pageStop; @@ -71,8 +80,6 @@ class BasePrefetcher /** Do we prefetch on only data reads, or on inst reads as well. */ bool onlyData; - std::string _name; - public: Stats::Scalar pfIdentified; @@ -85,16 +92,14 @@ class BasePrefetcher Stats::Scalar pfSpanPage; Stats::Scalar pfSquashed; - void regStats(const std::string &name); + void regStats(); public: - - BasePrefetcher(const BaseCacheParams *p); + typedef BasePrefetcherParams Params; + BasePrefetcher(const Params *p); virtual ~BasePrefetcher() {} - const std::string name() const { return _name; } - void setCache(BaseCache *_cache); /** @@ -130,7 +135,12 @@ class BasePrefetcher * Utility function: are addresses a and b on the same VM page? */ bool samePage(Addr a, Addr b); -}; - + public: + const Params* + params() const + { + return dynamic_cast(_params); + } +}; #endif //__MEM_CACHE_PREFETCH_BASE_PREFETCHER_HH__ diff --git a/src/mem/cache/prefetch/ghb.cc b/src/mem/cache/prefetch/ghb.cc index dbc565bfd..b9fc8e675 100644 --- a/src/mem/cache/prefetch/ghb.cc +++ b/src/mem/cache/prefetch/ghb.cc @@ -71,3 +71,10 @@ GHBPrefetcher::calculatePrefetch(PacketPtr &pkt, std::list &addresses, } } } + + +GHBPrefetcher* +GHBPrefetcherParams::create() +{ + return new GHBPrefetcher(this); +} diff --git a/src/mem/cache/prefetch/ghb.hh b/src/mem/cache/prefetch/ghb.hh index c85221a39..a21b57b93 100644 --- a/src/mem/cache/prefetch/ghb.hh +++ b/src/mem/cache/prefetch/ghb.hh @@ -37,6 +37,7 @@ #define __MEM_CACHE_PREFETCH_GHB_PREFETCHER_HH__ #include "mem/cache/prefetch/base.hh" +#include "params/GHBPrefetcher.hh" class GHBPrefetcher : public BasePrefetcher { @@ -47,15 +48,9 @@ class GHBPrefetcher : public BasePrefetcher Addr secondLastMissAddr[Max_Contexts]; Addr lastMissAddr[Max_Contexts]; - Tick latency; - int degree; - bool useContextId; - public: - - GHBPrefetcher(const BaseCacheParams *p) - : BasePrefetcher(p), latency(p->prefetch_latency), - degree(p->prefetch_degree), useContextId(p->prefetch_use_cpu_id) + GHBPrefetcher(const Params *p) + : BasePrefetcher(p) { } diff --git a/src/mem/cache/prefetch/stride.cc b/src/mem/cache/prefetch/stride.cc index a5cc805ef..645bc5fc5 100644 --- a/src/mem/cache/prefetch/stride.cc +++ b/src/mem/cache/prefetch/stride.cc @@ -132,3 +132,10 @@ StridePrefetcher::calculatePrefetch(PacketPtr &pkt, std::list &addresses, tab.push_back(new_entry); } } + + +StridePrefetcher* +StridePrefetcherParams::create() +{ + return new StridePrefetcher(this); +} diff --git a/src/mem/cache/prefetch/stride.hh b/src/mem/cache/prefetch/stride.hh index c78739b4e..51b4252a1 100644 --- a/src/mem/cache/prefetch/stride.hh +++ b/src/mem/cache/prefetch/stride.hh @@ -39,6 +39,7 @@ #include #include "mem/cache/prefetch/base.hh" +#include "params/StridePrefetcher.hh" class StridePrefetcher : public BasePrefetcher { @@ -63,15 +64,11 @@ class StridePrefetcher : public BasePrefetcher Addr *lastMissAddr[Max_Contexts]; std::list table[Max_Contexts]; - Tick latency; - int degree; - bool useContextId; public: - StridePrefetcher(const BaseCacheParams *p) - : BasePrefetcher(p), latency(p->prefetch_latency), - degree(p->prefetch_degree), useContextId(p->prefetch_use_cpu_id) + StridePrefetcher(const Params *p) + : BasePrefetcher(p) { } diff --git a/src/mem/cache/prefetch/tagged.cc b/src/mem/cache/prefetch/tagged.cc index 700af3790..c875b586b 100644 --- a/src/mem/cache/prefetch/tagged.cc +++ b/src/mem/cache/prefetch/tagged.cc @@ -35,9 +35,8 @@ #include "mem/cache/prefetch/tagged.hh" -TaggedPrefetcher::TaggedPrefetcher(const BaseCacheParams *p) - : BasePrefetcher(p), - latency(p->prefetch_latency), degree(p->prefetch_degree) +TaggedPrefetcher::TaggedPrefetcher(const Params *p) + : BasePrefetcher(p) { } @@ -62,3 +61,8 @@ calculatePrefetch(PacketPtr &pkt, std::list &addresses, } +TaggedPrefetcher* +TaggedPrefetcherParams::create() +{ + return new TaggedPrefetcher(this); +} diff --git a/src/mem/cache/prefetch/tagged.hh b/src/mem/cache/prefetch/tagged.hh index 78e20083d..8037196f8 100644 --- a/src/mem/cache/prefetch/tagged.hh +++ b/src/mem/cache/prefetch/tagged.hh @@ -37,17 +37,14 @@ #define __MEM_CACHE_PREFETCH_TAGGED_PREFETCHER_HH__ #include "mem/cache/prefetch/base.hh" +#include "params/TaggedPrefetcher.hh" + class TaggedPrefetcher : public BasePrefetcher { - protected: - - Tick latency; - int degree; - public: - TaggedPrefetcher(const BaseCacheParams *p); + TaggedPrefetcher(const Params *p); ~TaggedPrefetcher() {}