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diff --git a/deps/v8/tools/run-llprof.sh b/deps/v8/tools/run-llprof.sh
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+++ b/deps/v8/tools/run-llprof.sh
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+#!/bin/sh
+#
+# Copyright 2012 the V8 project authors. 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 Google Inc. 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.
+
+########## Global variable definitions
+
+# Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE.
+MAXIMUM_SAMPLE_RATE=10000000
+SAMPLE_EVERY_N_CYCLES=10000
+SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate"
+KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict"
+
+########## Usage
+
+usage() {
+cat << EOF
+usage: $0 <benchmark_command>
+
+Executes <benchmark_command> under observation by the kernel's "perf" \
+framework, then calls the low level tick processor to analyze the results.
+EOF
+}
+
+if [ $# -eq 0 ] || [ "$1" == "-h" ]  || [ "$1" == "--help" ] ; then
+  usage
+  exit 1
+fi
+
+########## Actual script execution
+
+ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE)
+if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then
+  echo "Setting appropriate maximum sample rate..."
+  echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE
+fi
+
+ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE)
+if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then
+  echo "Disabling kernel address map restriction..."
+  echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE
+fi
+
+echo "Running benchmark..."
+perf record -R -e cycles -c $SAMPLE_EVERY_N_CYCLES -f -i $@ --ll-prof