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      1 #!/bin/sh
      2 #
      3 # Copyright 2012 the V8 project authors. All rights reserved.
      4 # Redistribution and use in source and binary forms, with or without
      5 # modification, are permitted provided that the following conditions are
      6 # met:
      7 #
      8 #     * Redistributions of source code must retain the above copyright
      9 #       notice, this list of conditions and the following disclaimer.
     10 #     * Redistributions in binary form must reproduce the above
     11 #       copyright notice, this list of conditions and the following
     12 #       disclaimer in the documentation and/or other materials provided
     13 #       with the distribution.
     14 #     * Neither the name of Google Inc. nor the names of its
     15 #       contributors may be used to endorse or promote products derived
     16 #       from this software without specific prior written permission.
     17 #
     18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29 
     30 ########## Global variable definitions
     31 
     32 # Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE.
     33 MAXIMUM_SAMPLE_RATE=10000000
     34 SAMPLE_EVERY_N_CYCLES=10000
     35 SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate"
     36 KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict"
     37 
     38 ########## Usage
     39 
     40 usage() {
     41 cat << EOF
     42 usage: $0 <benchmark_command>
     43 
     44 Executes <benchmark_command> under observation by the kernel's "perf" \
     45 framework, then calls the low level tick processor to analyze the results.
     46 EOF
     47 }
     48 
     49 if [ $# -eq 0 ] || [ "$1" == "-h" ]  || [ "$1" == "--help" ] ; then
     50   usage
     51   exit 1
     52 fi
     53 
     54 ########## Actual script execution
     55 
     56 ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE)
     57 if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then
     58   echo "Setting appropriate maximum sample rate..."
     59   echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE
     60 fi
     61 
     62 ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE)
     63 if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then
     64   echo "Disabling kernel address map restriction..."
     65   echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE
     66 fi
     67 
     68 echo "Running benchmark..."
     69 perf record -R -e cycles -c $SAMPLE_EVERY_N_CYCLES -i $@ --ll-prof
     70