diff --git a/configs/example/gem5_library/x86-spec-cpu2006-benchmarks.py b/configs/example/gem5_library/x86-spec-cpu2006-benchmarks.py
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+# Copyright (c) 2021 The Regents of the University of California.
+# All rights reserved.
+#
+# 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.
+
+"""
+Script to run SPEC CPU2006 benchmarks with gem5.
+The script expects a benchmark program name and the simulation
+size. The system is fixed with 2 CPU cores, MESI Two Level system
+cache and 3 GB DDR4 memory. It uses the x86 board.
+
+This script will count the total number of instructions executed
+in the ROI. It also tracks how much wallclock and simulated time.
+
+Usage:
+------
+
+```
+scons build/X86/gem5.opt
+./build/X86/gem5.opt \
+    configs/example/gem5_library/x86-spec-cpu2006-benchmarks.py \
+    --image <full_path_to_the_spec-2006_disk_image> \
+    --partition <root_partition_to_mount> \
+    --benchmark <benchmark_name> \
+    --size <simulation_size>
+```
+
+"""
+
+import argparse
+import time
+import os
+import json
+
+import m5
+from m5.objects import Root
+
+from gem5.utils.requires import requires
+from gem5.components.boards.x86_board import X86Board
+from gem5.components.memory import DualChannelDDR4_2400
+from gem5.components.processors.simple_switchable_processor import(
+    SimpleSwitchableProcessor,
+)
+from gem5.components.processors.cpu_types import CPUTypes
+from gem5.isas import ISA
+from gem5.coherence_protocol import CoherenceProtocol
+from gem5.resources.resource import Resource, CustomResource
+
+from m5.stats.gem5stats import get_simstat
+from m5.util import warn
+from m5.util import fatal
+
+# We check for the required gem5 build.
+
+requires(
+    isa_required=ISA.X86,
+    coherence_protocol_required=CoherenceProtocol.MESI_TWO_LEVEL,
+    kvm_required=True,
+)
+
+# Following are the list of benchmark programs for SPEC CPU2006.
+# Note that 400.perlbench, 447.dealII, 450.soplex and 483.xalancbmk
+# have build errors, and, therefore cannot be executed. More information is
+# available at: https://www.gem5.org/documentation/benchmark_status/gem5-20
+
+benchmark_choices = ['400.perlbench', '401.bzip2', '403.gcc', '410.bwaves',
+                    '416.gamess', '429.mcf', '433.milc', '435.gromacs',
+                    '436.cactusADM', '437.leslie3d', '444.namd', '445.gobmk',
+                    '447.dealII', '450.soplex', '453.povray', '454.calculix',
+                    '456.hmmer', '458.sjeng', '459.GemsFDTD',
+                    '462.libquantum', '464.h264ref', '465.tonto', '470.lbm',
+                    '471.omnetpp', '473.astar', '481.wrf', '482.sphinx3',
+                    '483.xalancbmk', '998.specrand', '999.specrand']
+
+# Following are the input size.
+
+size_choices = ["test", "train", "ref"]
+
+parser = argparse.ArgumentParser(
+    description="An example configuration script to run the \
+        SPEC CPU2006 benchmarks."
+)
+
+# The arguments accepted are: a. disk-image name, b. benchmark name, c.
+# simulation size, and, d. root partition.
+
+# root partition is set to 1 by default.
+
+parser.add_argument(
+    "--image",
+    type = str,
+    required = True,
+    help = "Input the full path to the built spec-2006 disk-image."
+)
+
+parser.add_argument(
+    "--partition",
+    type = str,
+    required = True,
+    help = "Input the root partition of the SPEC disk-image. If the disk is \
+    not partitioned, then pass \"\"."
+)
+
+parser.add_argument(
+    "--benchmark",
+    type = str,
+    required=True,
+    help = "Input the benchmark program to execute.",
+    choices=benchmark_choices,
+)
+
+parser.add_argument(
+    "--size",
+    type = str,
+    required=True,
+    help = "Sumulation size the benchmark program.",
+    choices = size_choices,
+)
+
+args = parser.parse_args()
+
+# We expect the user to input the full path of the disk-image.
+if args.image[0] != "/":
+    # We need to get the absolute path to this file. We assume that the file is
+    # present on the current working directory.
+    args.image = os.path.abspath(args.image)
+
+if not os.path.exists(args.image):
+    warn("Disk image not found!")
+    print("Instructions on building the disk image can be found at: ")
+    print(
+    "https://gem5art.readthedocs.io/en/latest/tutorials/spec-tutorial.html"
+    )
+    fatal("The disk-image is not found at {}".format(args.image))
+
+# Setting up all the fixed system parameters here
+# Caches: MESI Two Level Cache Hierarchy
+
+from gem5.components.cachehierarchies.ruby.\
+    mesi_two_level_cache_hierarchy import(
+    MESITwoLevelCacheHierarchy,
+)
+
+cache_hierarchy = MESITwoLevelCacheHierarchy(
+    l1d_size = "32kB",
+    l1d_assoc = 8,
+    l1i_size="32kB",
+    l1i_assoc=8,
+    l2_size="256kB",
+    l2_assoc=16,
+    num_l2_banks=2,
+)
+# Memory: Dual Channel DDR4 2400 DRAM device.
+# The X86 board only supports 3 GB of main memory.
+
+memory = DualChannelDDR4_2400(size = "3GB")
+
+# Here we setup the processor. This is a special switchable processor in which
+# a starting core type and a switch core type must be specified. Once a
+# configuration is instantiated a user may call `processor.switch()` to switch
+# from the starting core types to the switch core types. In this simulation
+# we start with KVM cores to simulate the OS boot, then switch to the Timing
+# cores for the command we wish to run after boot.
+
+processor = SimpleSwitchableProcessor(
+    starting_core_type=CPUTypes.KVM,
+    switch_core_type=CPUTypes.TIMING,
+    num_cores=2,
+)
+
+# Here we setup the board. The X86Board allows for Full-System X86 simulations
+
+board = X86Board(
+    clk_freq="3GHz",
+    processor=processor,
+    memory=memory,
+    cache_hierarchy=cache_hierarchy,
+)
+
+# SPEC CPU2006 benchmarks output placed in /home/gem5/spec2006/results
+# directory on the disk-image. The following folder is created in the
+# m5.options.outdir and the output from the disk-image folder is copied to
+# this folder.
+
+output_dir = "speclogs_" + ''.join(x.strip() for x in time.asctime().split())
+output_dir = output_dir.replace(":","")
+
+# We create this folder if it is absent.
+try:
+    os.makedirs(os.path.join(m5.options.outdir, output_dir))
+except FileExistsError:
+    warn("output directory already exists!")
+
+# Here we set the FS workload, i.e., SPEC CPU2006 benchmark
+# After simulation has ended you may inspect
+# `m5out/system.pc.com_1.device` to the stdout, if any.
+
+# After the system boots, we execute the benchmark program and wait till the
+# `m5_exit instruction encountered` is encountered. We start collecting
+# the number of committed instructions till ROI ends (marked by another
+# `m5_exit instruction encountered`). We then start copying the output logs,
+# present in the /home/gem5/spec2006/results directory to the `output_dir`.
+
+# The runscript.sh file places `m5 exit` before and after the following command
+# Therefore, we only pass this command without m5 exit.
+
+command = "{} {} {}".format(args.benchmark, args.size, output_dir)
+
+# For enabling CustomResource, we pass an additional parameter to mount the
+# correct partition.
+
+metadata = {
+    "additional_metadata" : {
+        "root_partition" : args.partition,
+    },
+}
+
+board.set_kernel_disk_workload(
+    # The x86 linux kernel will be automatically downloaded to the
+    # `~/.cache/gem5` directory if not already present.
+    # SPEC CPU2006 benchamarks were tested with kernel version 4.19.83 and
+    # 5.4.49
+    kernel=Resource(
+        "x86-linux-kernel-4.19.83",
+    ),
+    # The location of the x86 SPEC CPU 2017 image
+    disk_image=CustomResource(
+        args.image,
+        metadata=metadata
+    ),
+    readfile_contents=command,
+)
+
+# We need this for long running processes.
+m5.disableAllListeners()
+
+root = Root(full_system = True, system = board)
+
+# sim_quantum must be set when KVM cores are used.
+
+root.sim_quantum = int(1e9)
+
+m5.instantiate()
+
+# We maintain the wall clock time.
+
+globalStart = time.time()
+
+print("Running the simulation")
+print("Using KVM cpu")
+
+start_tick = m5.curTick()
+end_tick = m5.curTick()
+m5.stats.reset()
+
+exit_event = m5.simulate()
+
+if exit_event.getCause() == "m5_exit instruction encountered":
+    # We have completed booting the OS using KVM cpu
+    # Reached the start of ROI
+
+    print("Done booting Linux")
+    print("Resetting stats at the start of ROI!")
+
+    m5.stats.reset()
+    start_tick = m5.curTick()
+
+    # We switch to timing cpu for detailed simulation.
+
+    processor.switch()
+else:
+    # `m5_exit instruction encountered` was never reached
+
+    print("Unexpected termination of simulation before ROI was reached!")
+    print(
+        "Exiting @ tick {} because {}.".format(
+            m5.curTick(),
+            exit_event.getCause()
+        )
+    )
+    exit(-1)
+
+# Simulate the ROI
+exit_event = m5.simulate()
+
+# Reached the end of ROI
+gem5stats = get_simstat(root)
+
+# We get the number of committed instructions from the timing
+# cores. We then sum and print them at the end.
+
+roi_insts = float(\
+    json.loads(gem5stats.dumps())\
+    ["system"]["processor"]["cores2"]["core"]["exec_context.thread_0"]\
+    ["numInsts"]["value"]) + float(\
+    json.loads(gem5stats.dumps())\
+    ["system"]["processor"]["cores3"]["core"]["exec_context.thread_0"]\
+    ["numInsts"]["value"]\
+)
+
+if exit_event.getCause() == "m5_exit instruction encountered":
+    print("Dump stats at the end of the ROI!")
+    m5.stats.dump()
+    end_tick = m5.curTick()
+    m5.stats.reset()
+
+else:
+    # `m5_exit instruction encountered` was never reached
+
+    print("Unexpected termination of simulation while ROI was being executed!")
+    print(
+        "Exiting @ tick {} because {}.".format(
+            m5.curTick(),
+            exit_event.getCause()
+        )
+    )
+    exit(-1)
+
+# We need to copy back the contents of the `speclogs' directory to
+# m5.options.outdir
+
+exit_event = m5.simulate()
+
+if exit_event.getCause() == "m5_exit instruction encountered":
+    print("Output logs copied!")
+
+else:
+    print("Unexpected termination of simulation while copying speclogs!")
+    print(
+        "Exiting @ tick {} because {}.".format(
+            m5.curTick(),
+            exit_event.getCause()
+        )
+    )
+    exit(-1)
+
+m5.stats.dump()
+end_tick = m5.curTick()
+m5.stats.reset()
+
+# Simulation is over at this point. We acknowledge that all the simulation
+# events were successful.
+print("All simulation events were successful.")
+# We print the final simulation statistics.
+
+print("Performance statistics:")
+
+print("Simulated time: %.2fs" % ((end_tick-start_tick)/1e12))
+print("Instructions executed: %d" % ((roi_insts)))
+print("Ran a total of", m5.curTick()/1e12, "simulated seconds")
+print("Total wallclock time: %.2fs, %.2f min" % \
+            (time.time()-globalStart, (time.time()-globalStart)/60))