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58 lines
1.6 KiB
58 lines
1.6 KiB
#! /bin/sh
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#
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# Copyright 2016 the V8 project authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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#
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########## Global variable definitions
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# Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE.
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MAXIMUM_SAMPLE_RATE=10000000
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SAMPLE_EVERY_N_CYCLES=10000
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SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate"
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KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict"
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CALL_GRAPH_METHOD="fp" # dwarf does not play nice with JITted objects.
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EVENT_TYPE=${EVENT_TYPE:=cycles:u}
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########## Usage
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usage() {
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cat << EOF
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usage: $0 <benchmark_command>
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Executes <benchmark_command> under observation by Linux perf.
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Sampling event is cycles in user space, call graphs are recorded.
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EOF
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}
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if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ] ; then
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usage
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exit 1
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fi
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########## Actual script execution
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ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE)
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if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then
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echo "Setting appropriate maximum sample rate..."
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echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE
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fi
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ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE)
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if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then
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echo "Disabling kernel address map restriction..."
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echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE
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fi
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# Extract the command being perfed, so that we can prepend arguments to the
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# arguments that the user supplied.
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COMMAND=$1
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shift 1
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echo "Running..."
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perf record -R \
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-e $EVENT_TYPE \
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-c $SAMPLE_EVERY_N_CYCLES \
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--call-graph $CALL_GRAPH_METHOD \
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-i "$COMMAND" --perf_basic_prof "$@"
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