Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1 | #! /bin/sh |
| 2 | # |
| 3 | # Copyright 2016 the V8 project authors. All rights reserved. |
| 4 | # Use of this source code is governed by a BSD-style license that can be |
| 5 | # found in the LICENSE file. |
| 6 | # |
| 7 | |
| 8 | ########## Global variable definitions |
| 9 | |
| 10 | # Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE. |
| 11 | MAXIMUM_SAMPLE_RATE=10000000 |
| 12 | SAMPLE_EVERY_N_CYCLES=10000 |
| 13 | SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate" |
| 14 | KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict" |
| 15 | CALL_GRAPH_METHOD="fp" # dwarf does not play nice with JITted objects. |
| 16 | |
| 17 | ########## Usage |
| 18 | |
| 19 | usage() { |
| 20 | cat << EOF |
| 21 | usage: $0 <benchmark_command> |
| 22 | |
| 23 | Executes <benchmark_command> under observation by Linux perf. |
| 24 | Sampling event is cycles in user space, call graphs are recorded. |
| 25 | EOF |
| 26 | } |
| 27 | |
| 28 | if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ] ; then |
| 29 | usage |
| 30 | exit 1 |
| 31 | fi |
| 32 | |
| 33 | ########## Actual script execution |
| 34 | |
| 35 | ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE) |
| 36 | if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then |
| 37 | echo "Setting appropriate maximum sample rate..." |
| 38 | echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE |
| 39 | fi |
| 40 | |
| 41 | ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE) |
| 42 | if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then |
| 43 | echo "Disabling kernel address map restriction..." |
| 44 | echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE |
| 45 | fi |
| 46 | |
| 47 | echo "Running..." |
| 48 | perf record -R \ |
| 49 | -e cycles:u \ |
| 50 | -c $SAMPLE_EVERY_N_CYCLES \ |
| 51 | --call-graph $CALL_GRAPH_METHOD \ |
| 52 | -i $@ --perf_basic_prof |