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#!/bin/bash
# Copyright 2022 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
PERF_DATA_DIR="."
PERF_DATA_PREFIX="chrome_renderer"
RENDERER_ID="0"
PERF_RECORD_FREQ="max"
for i in "$@"; do
case $i in
--help)
cat <<EOM
Usage: path/to/chrome --renderer-cmd-prefix='${0} [OPTION]' [CHROME OPTIONS]
This script is used to run linux-perf for each renderer process.
It generates perf.data files that can be read by pprof or linux-perf.
Output: \$OUT_DIR/\$PREFIX_\$PPID_\$RENDERER_ID.perf.data
Options:
--perf-data-dir=OUT_DIR Change the location where perf.data is written.
Default: '${PERF_DATA_DIR}'
--perf-data-prefix=PREFIX Set a custom prefix for all generated perf.data
files.
Default: '${PERF_DATA_PREFIX}'
--perf-freq=FREQ Sets the sampling frequency:
'perf record --freq=FREQ'
Default: '${PERF_RECORD_FREQ}'
EOM
exit
;;
--perf-data-dir=*)
PERF_DATA_DIR="${i#*=}"
shift
;;
--perf-data-prefix=*)
PERF_DATA_PREFIX="${i#*=}"
shift
;;
--perf-freq=*)
PERF_RECORD_FREQ="${i#*=}"
shift
;;
--renderer-client-id=*)
# Don't shift this option since it is passed in (and used by) chrome.
RENDERER_ID="${i#*=}"
;;
*)
;;
esac
done
PERF_OUTPUT="$PERF_DATA_DIR/${PERF_DATA_PREFIX}_${PPID}_${RENDERER_ID}.perf.data"
perf record \
--call-graph=fp --clockid=mono --freq="${PERF_RECORD_FREQ}" \
--output="${PERF_OUTPUT}" \
-- $@
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