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+/*
+ * Copyright (c) 2016 Google Inc.
+ * 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.
+ *
+ * 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: Rahul Thakur
+ */
+
+#ifndef __MEM_PROBES_MEM_FOOTPRINT_HH__
+#define __MEM_PROBES_MEM_FOOTPRINT_HH__
+
+#include <unordered_map>
+
+#include "base/callback.hh"
+#include "mem/packet.hh"
+#include "mem/probes/base.hh"
+#include "sim/stats.hh"
+#include "sim/system.hh"
+
+struct MemFootprintProbeParams;
+
+/// Probe to track footprint of accessed memory
+/// Two granularity of footprint measurement i.e. cache line and page
+class MemFootprintProbe : public BaseMemProbe
+{
+  public:
+    typedef std::unordered_set<Addr> AddrSet;
+
+    MemFootprintProbe(MemFootprintProbeParams *p);
+    void regStats() override;
+    // Fix footprint tracking state on stat reset
+    void statReset();
+
+  protected:
+    /// Cache Line size for footprint measurement (log2)
+    const uint8_t cacheLineSizeLg2;
+    /// Page size for footprint measurement (log2)
+    const uint8_t pageSizeLg2;
+    const uint64_t totalCacheLinesInMem;
+    const uint64_t totalPagesInMem;
+
+    void insertAddr(Addr addr, AddrSet *set, uint64_t limit);
+    void handleRequest(const ProbePoints::PacketInfo &pkt_info) override;
+
+    /// Footprint at cache line size granularity
+    Stats::Scalar fpCacheLine;
+    /// Footprint at cache line size granularity, since simulation begin
+    Stats::Scalar fpCacheLineTotal;
+    /// Footprint at page granularity
+    Stats::Scalar fpPage;
+    /// Footprint at page granularity, since simulation begin
+    Stats::Scalar fpPageTotal;
+
+    // Addr set to track unique cache lines accessed
+    AddrSet cacheLines;
+    // Addr set to track unique cache lines accessed since simulation begin
+    AddrSet cacheLinesAll;
+    // Addr set to track unique pages accessed
+    AddrSet pages;
+    // Addr set to track unique pages accessed since simulation begin
+    AddrSet pagesAll;
+    System *system;
+};
+
+#endif  //__MEM_PROBES_MEM_FOOTPRINT_HH__