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248 lines
6.2 KiB
Bash
248 lines
6.2 KiB
Bash
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-only
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# perf-with-kcore: use perf with a copy of kcore
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# Copyright (c) 2014, Intel Corporation.
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#
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set -e
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usage()
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{
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echo "Usage: perf-with-kcore <perf sub-command> <perf.data directory> [<sub-command options> [ -- <workload>]]" >&2
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echo " <perf sub-command> can be record, script, report or inject" >&2
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echo " or: perf-with-kcore fix_buildid_cache_permissions" >&2
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exit 1
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}
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find_perf()
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{
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if [ -n "$PERF" ] ; then
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return
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fi
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PERF=`which perf || true`
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if [ -z "$PERF" ] ; then
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echo "Failed to find perf" >&2
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exit 1
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fi
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if [ ! -x "$PERF" ] ; then
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echo "Failed to find perf" >&2
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exit 1
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fi
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echo "Using $PERF"
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"$PERF" version
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}
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copy_kcore()
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{
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echo "Copying kcore"
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if [ $EUID -eq 0 ] ; then
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SUDO=""
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else
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SUDO="sudo"
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fi
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rm -f perf.data.junk
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("$PERF" record -o perf.data.junk "${PERF_OPTIONS[@]}" -- sleep 60) >/dev/null 2>/dev/null &
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PERF_PID=$!
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# Need to make sure that perf has started
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sleep 1
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KCORE=$(($SUDO "$PERF" buildid-cache -v -f -k /proc/kcore >/dev/null) 2>&1)
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case "$KCORE" in
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"kcore added to build-id cache directory "*)
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KCORE_DIR=${KCORE#"kcore added to build-id cache directory "}
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;;
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*)
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kill $PERF_PID
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wait >/dev/null 2>/dev/null || true
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rm perf.data.junk
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echo "$KCORE"
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echo "Failed to find kcore" >&2
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exit 1
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;;
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esac
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kill $PERF_PID
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wait >/dev/null 2>/dev/null || true
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rm perf.data.junk
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$SUDO cp -a "$KCORE_DIR" "$(pwd)/$PERF_DATA_DIR"
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$SUDO rm -f "$KCORE_DIR/kcore"
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$SUDO rm -f "$KCORE_DIR/kallsyms"
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$SUDO rm -f "$KCORE_DIR/modules"
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$SUDO rmdir "$KCORE_DIR"
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KCORE_DIR_BASENAME=$(basename "$KCORE_DIR")
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KCORE_DIR="$(pwd)/$PERF_DATA_DIR/$KCORE_DIR_BASENAME"
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$SUDO chown $UID "$KCORE_DIR"
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$SUDO chown $UID "$KCORE_DIR/kcore"
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$SUDO chown $UID "$KCORE_DIR/kallsyms"
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$SUDO chown $UID "$KCORE_DIR/modules"
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$SUDO chgrp $GROUPS "$KCORE_DIR"
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$SUDO chgrp $GROUPS "$KCORE_DIR/kcore"
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$SUDO chgrp $GROUPS "$KCORE_DIR/kallsyms"
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$SUDO chgrp $GROUPS "$KCORE_DIR/modules"
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ln -s "$KCORE_DIR_BASENAME" "$PERF_DATA_DIR/kcore_dir"
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}
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fix_buildid_cache_permissions()
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{
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if [ $EUID -ne 0 ] ; then
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echo "This script must be run as root via sudo " >&2
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exit 1
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fi
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if [ -z "$SUDO_USER" ] ; then
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echo "This script must be run via sudo" >&2
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exit 1
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fi
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USER_HOME=$(bash <<< "echo ~$SUDO_USER")
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echo "Fixing buildid cache permissions"
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find "$USER_HOME/.debug" -xdev -type d ! -user "$SUDO_USER" -ls -exec chown "$SUDO_USER" \{\} \;
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find "$USER_HOME/.debug" -xdev -type f -links 1 ! -user "$SUDO_USER" -ls -exec chown "$SUDO_USER" \{\} \;
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find "$USER_HOME/.debug" -xdev -type l ! -user "$SUDO_USER" -ls -exec chown -h "$SUDO_USER" \{\} \;
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if [ -n "$SUDO_GID" ] ; then
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find "$USER_HOME/.debug" -xdev -type d ! -group "$SUDO_GID" -ls -exec chgrp "$SUDO_GID" \{\} \;
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find "$USER_HOME/.debug" -xdev -type f -links 1 ! -group "$SUDO_GID" -ls -exec chgrp "$SUDO_GID" \{\} \;
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find "$USER_HOME/.debug" -xdev -type l ! -group "$SUDO_GID" -ls -exec chgrp -h "$SUDO_GID" \{\} \;
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fi
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echo "Done"
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}
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check_buildid_cache_permissions()
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{
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if [ $EUID -eq 0 ] ; then
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return
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fi
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PERMISSIONS_OK+=$(find "$HOME/.debug" -xdev -type d ! -user "$USER" -print -quit)
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PERMISSIONS_OK+=$(find "$HOME/.debug" -xdev -type f -links 1 ! -user "$USER" -print -quit)
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PERMISSIONS_OK+=$(find "$HOME/.debug" -xdev -type l ! -user "$USER" -print -quit)
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PERMISSIONS_OK+=$(find "$HOME/.debug" -xdev -type d ! -group "$GROUPS" -print -quit)
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PERMISSIONS_OK+=$(find "$HOME/.debug" -xdev -type f -links 1 ! -group "$GROUPS" -print -quit)
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PERMISSIONS_OK+=$(find "$HOME/.debug" -xdev -type l ! -group "$GROUPS" -print -quit)
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if [ -n "$PERMISSIONS_OK" ] ; then
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echo "*** WARNING *** buildid cache permissions may need fixing" >&2
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fi
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}
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record()
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{
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echo "Recording"
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if [ $EUID -ne 0 ] ; then
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if [ "$(cat /proc/sys/kernel/kptr_restrict)" -ne 0 ] ; then
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echo "*** WARNING *** /proc/sys/kernel/kptr_restrict prevents access to kernel addresses" >&2
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fi
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if echo "${PERF_OPTIONS[@]}" | grep -q ' -a \|^-a \| -a$\|^-a$\| --all-cpus \|^--all-cpus \| --all-cpus$\|^--all-cpus$' ; then
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echo "*** WARNING *** system-wide tracing without root access will not be able to read all necessary information from /proc" >&2
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fi
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if echo "${PERF_OPTIONS[@]}" | grep -q 'intel_pt\|intel_bts\| -I\|^-I' ; then
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if [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt -1 ] ; then
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echo "*** WARNING *** /proc/sys/kernel/perf_event_paranoid restricts buffer size and tracepoint (sched_switch) use" >&2
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fi
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if echo "${PERF_OPTIONS[@]}" | grep -q ' --per-thread \|^--per-thread \| --per-thread$\|^--per-thread$' ; then
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true
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elif echo "${PERF_OPTIONS[@]}" | grep -q ' -t \|^-t \| -t$\|^-t$' ; then
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true
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elif [ ! -r /sys/kernel/debug -o ! -x /sys/kernel/debug ] ; then
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echo "*** WARNING *** /sys/kernel/debug permissions prevent tracepoint (sched_switch) use" >&2
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fi
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fi
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fi
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if [ -z "$1" ] ; then
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echo "Workload is required for recording" >&2
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usage
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fi
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if [ -e "$PERF_DATA_DIR" ] ; then
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echo "'$PERF_DATA_DIR' exists" >&2
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exit 1
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fi
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find_perf
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mkdir "$PERF_DATA_DIR"
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echo "$PERF record -o $PERF_DATA_DIR/perf.data ${PERF_OPTIONS[@]} -- $@"
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"$PERF" record -o "$PERF_DATA_DIR/perf.data" "${PERF_OPTIONS[@]}" -- "$@" || true
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if rmdir "$PERF_DATA_DIR" > /dev/null 2>/dev/null ; then
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exit 1
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fi
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copy_kcore
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echo "Done"
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}
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subcommand()
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{
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find_perf
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check_buildid_cache_permissions
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echo "$PERF $PERF_SUB_COMMAND -i $PERF_DATA_DIR/perf.data --kallsyms=$PERF_DATA_DIR/kcore_dir/kallsyms $@"
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"$PERF" $PERF_SUB_COMMAND -i "$PERF_DATA_DIR/perf.data" "--kallsyms=$PERF_DATA_DIR/kcore_dir/kallsyms" "$@"
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}
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if [ "$1" = "fix_buildid_cache_permissions" ] ; then
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fix_buildid_cache_permissions
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exit 0
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fi
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PERF_SUB_COMMAND=$1
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PERF_DATA_DIR=$2
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shift || true
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shift || true
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if [ -z "$PERF_SUB_COMMAND" ] ; then
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usage
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fi
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if [ -z "$PERF_DATA_DIR" ] ; then
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usage
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fi
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case "$PERF_SUB_COMMAND" in
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"record")
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while [ "$1" != "--" ] ; do
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PERF_OPTIONS+=("$1")
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shift || break
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done
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if [ "$1" != "--" ] ; then
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echo "Options and workload are required for recording" >&2
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usage
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fi
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shift
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record "$@"
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;;
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"script")
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subcommand "$@"
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;;
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"report")
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subcommand "$@"
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;;
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"inject")
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subcommand "$@"
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;;
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*)
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usage
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;;
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esac
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