mem-cache: Add switch on/off duplicate entries into RMOB

Change-Id: I394d7c852a439be5315c4755b091c8741e671ea3
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55083
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Daniel Carvalho <odanrc@yahoo.com.br>
Tested-by: kokoro <noreply+kokoro@google.com>

src/mem/cache/prefetch/Prefetcher.py

@@ -488,6 +488,8 @@ class STeMSPrefetcher(QueuedPrefetcher):
 
     region_miss_order_buffer_entries = Param.Unsigned(131072,
         "Number of entries of the Region Miss Order Buffer")
+    add_duplicate_entries_to_rmob = Param.Bool(True,
+        "Add duplicate entries to RMOB")
     reconstruction_entries = Param.Unsigned(256,
         "Number of reconstruction entries")
 

src/mem/cache/prefetch/spatio_temporal_memory_streaming.cc

@@ -56,6 +56,7 @@ STeMS::STeMS(const STeMSPrefetcherParams &p)
                          ActiveGenerationTableEntry(
                              spatialRegionSize / blkSize)),
     rmob(p.region_miss_order_buffer_entries),
+    addDuplicateEntriesToRMOB(p.add_duplicate_entries_to_rmob),
     lastTriggerCounter(0)
 {
     fatal_if(!isPowerOf2(spatialRegionSize),
@@ -120,6 +121,16 @@ STeMS::addToRMOB(Addr sr_addr, Addr pst_addr, unsigned int delta)
     rmob_entry.pstAddress = pst_addr;
     rmob_entry.delta = delta;
 
+    if (!addDuplicateEntriesToRMOB) {
+        for (const auto& entry : rmob) {
+            if (entry.srAddress == sr_addr &&
+                entry.pstAddress == pst_addr &&
+                entry.delta == delta) {
+                return;
+            }
+        }
+    }
+
     rmob.push_back(rmob_entry);
 }
 

src/mem/cache/prefetch/spatio_temporal_memory_streaming.hh

@@ -175,6 +175,9 @@ class STeMS : public Queued
     /** Region Miss Order Buffer (RMOB) */
     CircularQueue<RegionMissOrderBufferEntry> rmob;
 
+    /** Add duplicate entries to RMOB  */
+    bool addDuplicateEntriesToRMOB;
+
     /** Counter to keep the count of accesses between trigger accesses */
     unsigned int lastTriggerCounter;