[tools][profiling] Add linux-perf profiling helper script
Change-Id: I8b84884257f20b1728e627f9c2e3643972f93514 Bug: 1299802 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3757345 Reviewed-by: Benoit Lize <lizeb@chromium.org> Reviewed-by: Bruce Dawson <brucedawson@chromium.org> Commit-Queue: Bruce Dawson <brucedawson@chromium.org> Auto-Submit: Camillo Bruni <cbruni@chromium.org> Cr-Commit-Position: refs/heads/main@{#1029356}
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Chromium LUCI CQ

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@@ -61,6 +61,10 @@ To stop profiling, press `Control-c` in the terminal window where `perf` is runn
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Tip for Googlers: running `gcert` first will make `pprof` run faster, and eliminate some useless spew to the terminal.
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Tip for Googlers: running `gcert` first will make `pprof` run faster, and eliminate some useless spew to the terminal.
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***
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***
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If you want to profile all renderer processes use the custom `--renderer-cmd-prefix` profiling script:
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$ src/out/Release/chrome --renderer-cmd-prefix="tools/profiling/linux-perf-renderer-cmd.sh"
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If you want to limit the profile to a single thread, run:
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If you want to limit the profile to a single thread, run:
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$ ps -T -p <Process ID>
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$ ps -T -p <Process ID>
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60
tools/profiling/linux-perf-renderer-cmd.sh
Executable file
60
tools/profiling/linux-perf-renderer-cmd.sh
Executable file
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#!/bin/bash
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# Copyright 2022 The Chromium 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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PERF_DATA_DIR="."
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PERF_DATA_PREFIX="chrome_renderer"
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RENDERER_ID="0"
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PERF_RECORD_FREQ="max"
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for i in "$@"; do
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case $i in
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--help)
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cat <<EOM
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Usage: path/to/chrome --renderer-cmd-prefix='${0} [OPTION]' [CHROME OPTIONS]
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This script is used to run linux-perf for each renderer process.
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It generates perf.data files that can be read by pprof or linux-perf.
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Output: \$OUT_DIR/\$PREFIX_\$PPID_\$RENDERER_ID.perf.data
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Options:
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--perf-data-dir=OUT_DIR Change the location where perf.data is written.
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Default: '${PERF_DATA_DIR}'
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--perf-data-prefix=PREFIX Set a custom prefix for all generated perf.data
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files.
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Default: '${PERF_DATA_PREFIX}'
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--perf-freq=FREQ Sets the sampling frequency:
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'perf record --freq=FREQ'
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Default: '${PERF_RECORD_FREQ}'
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EOM
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exit
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;;
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--perf-data-dir=*)
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PERF_DATA_DIR="${i#*=}"
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shift
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;;
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--perf-data-prefix=*)
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PERF_DATA_PREFIX="${i#*=}"
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shift
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;;
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--perf-freq=*)
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PERF_RECORD_FREQ="${i#*=}"
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shift
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;;
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--renderer-client-id=*)
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# Don't shift this option since it is passed in (and used by) chrome.
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RENDERER_ID="${i#*=}"
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;;
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*)
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;;
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esac
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done
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PERF_OUTPUT="$PERF_DATA_DIR/${PERF_DATA_PREFIX}_${PPID}_${RENDERER_ID}.perf.data"
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perf record \
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--call-graph=fp --clockid=mono --freq="${PERF_RECORD_FREQ}" \
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--output="${PERF_OUTPUT}" \
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-- $@
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