[gem5-dev] changeset in gem5: arm: Add TLB PMU probes

[Andreas Sandberg via gem5-dev]

changeset 25c5da51bbe0 in /z/repo/gem5
details: http://repo.gem5.org/gem5?cmd=changeset;node=25c5da51bbe0
description:
        arm: Add TLB PMU probes

        This changeset adds probe points that can be used to implement PMU
        counters for TLB stats. The following probes are supported:

        * ArmISA::TLB::ppRefills / TLB Refills (TLB insertions)

diffstat:

 src/arch/arm/tlb.cc |  7 +++++++
 src/arch/arm/tlb.hh |  6 ++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diffs (54 lines):

diff -r e975e8afba8b -r 25c5da51bbe0 src/arch/arm/tlb.cc
--- a/src/arch/arm/tlb.cc       Thu Oct 16 05:49:40 2014 -0400
+++ b/src/arch/arm/tlb.cc       Thu Oct 16 05:49:41 2014 -0400
@@ -197,6 +197,7 @@
     table[0] = entry;
 
     inserts++;
+    ppRefills->notify(1);
 }
 
 void
@@ -531,6 +532,12 @@
     accesses = readAccesses + writeAccesses + instAccesses;
 }
 
+void
+TLB::regProbePoints()
+{
+    ppRefills.reset(new ProbePoints::PMU(getProbeManager(), "Refills"));
+}
+
 Fault
 TLB::translateSe(RequestPtr req, ThreadContext *tc, Mode mode,
                  Translation *translation, bool &delay, bool timing)
diff -r e975e8afba8b -r 25c5da51bbe0 src/arch/arm/tlb.hh
--- a/src/arch/arm/tlb.hh       Thu Oct 16 05:49:40 2014 -0400
+++ b/src/arch/arm/tlb.hh       Thu Oct 16 05:49:41 2014 -0400
@@ -53,6 +53,7 @@
 #include "mem/request.hh"
 #include "params/ArmTLB.hh"
 #include "sim/fault_fwd.hh"
+#include "sim/probe/pmu.hh"
 #include "sim/tlb.hh"
 
 class ThreadContext;
@@ -131,6 +132,9 @@
     Stats::Formula misses;
     Stats::Formula accesses;
 
+    /** PMU probe for TLB refills */
+    ProbePoints::PMUUPtr ppRefills;
+
     int rangeMRU; //On lookup, only move entries ahead when outside rangeMRU
 
     bool bootUncacheability;
@@ -291,6 +295,8 @@
 
     void regStats();
 
+    void regProbePoints() M5_ATTR_OVERRIDE;
+
     /**
      * Get the table walker master port. This is used for migrating
      * port connections during a CPU takeOverFrom() call. For
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