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#! /bin/sh
#
# Copyright 2016 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
########## Global variable definitions
# Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE.
MAXIMUM_SAMPLE_RATE=10000000
SAMPLE_EVERY_N_CYCLES=10000
SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate"
KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict"
CALL_GRAPH_METHOD="fp" # dwarf does not play nice with JITted objects.
EVENT_TYPE=${EVENT_TYPE:=cycles:u}
########## Usage
usage() {
cat << EOF
usage: $0 <benchmark_command>
Executes <benchmark_command> under observation by Linux perf.
Sampling event is cycles in user space, call graphs are recorded.
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
# Extract the command being perfed, so that we can prepend arguments to the
# arguments that the user supplied.
COMMAND=$1
shift 1
echo "Running..."
perf record -R \
-e $EVENT_TYPE \
-c $SAMPLE_EVERY_N_CYCLES \
--call-graph $CALL_GRAPH_METHOD \
-i "$COMMAND" --perf-basic-prof "$@"