mem: Add access statistics for the snoop filter

Adds a simple access counter for requests and snoops for the snoop filter and
also classifies hits based on whether a single other holder existed or whether
multiple shares held the line.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/mem/snoop_filter.hh b/src/mem/snoop_filter.hh
index c1bb65dfc..88b534263 100755
--- a/src/mem/snoop_filter.hh
+++ b/src/mem/snoop_filter.hh
@@ -188,6 +188,8 @@ class SnoopFilter : public SimObject {
         return std::make_pair(empty , latency);
     }
 
+    virtual void regStats();
+
   protected:
     typedef uint64_t SnoopMask;
    /**
@@ -227,6 +229,15 @@ class SnoopFilter : public SimObject {
     const unsigned linesize;
     /** Latency for doing a lookup in the filter */
     const Cycles lookupLatency;
+
+    /** Statistics */
+    Stats::Scalar totRequests;
+    Stats::Scalar hitSingleRequests;
+    Stats::Scalar hitMultiRequests;
+
+    Stats::Scalar totSnoops;
+    Stats::Scalar hitSingleSnoops;
+    Stats::Scalar hitMultiSnoops;
 };
 
 inline SnoopFilter::SnoopMask