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#!/bin/bash -e
# CoreSight context switch thread attribution (exclusive)
# SPDX-License-Identifier: GPL-2.0
# If CoreSight is not available, skip the test
perf list pmu | grep -q cs_etm || exit 2
if [ "$(id -u)" != 0 ]; then
# Requires root for "-C 0" in record command
echo "[Skip] No root permission"
exit 2
fi
tmpdir=$(mktemp -d /tmp/__perf_test.coresight_context_switch.XXXXX)
cleanup() {
rm -rf "${tmpdir}"
trap - EXIT TERM INT
}
trap_cleanup() {
cleanup
exit 1
}
trap trap_cleanup EXIT TERM INT
check_samples() {
owner_samples=$(grep -c "proc1.*context_switch_loop_proc1" "$tmpdir/script" || true)
next_samples=$(grep -c "proc2.*context_switch_loop_proc2" "$tmpdir/script" || true)
if [ "$owner_samples" -eq 0 ] || [ "$next_samples" -eq 0 ]; then
echo "No samples found"
cleanup
exit 1
fi
if grep "proc2.*context_switch_loop_proc1" "$tmpdir/script"; then
echo "Thread1 symbol was attributed to proc2"
cleanup
exit 1
fi
if grep "proc1.*context_switch_loop_proc2" "$tmpdir/script"; then
echo "Thread2 symbol was attributed to proc1"
cleanup
exit 1
fi
}
cf="$tmpdir/ctl"
af="$tmpdir/ack"
mkfifo "$cf" "$af"
# Pin to one CPU so the two threads alternate running but record into the same
# trace buffer. Start disabled and use the control FIFO to only record the
# workload and not startup.
perf record -o "$tmpdir/data" -e cs_etm/timestamp=0/u -C 0 -D -1 --control fifo:"$cf","$af" -- \
taskset --cpu-list 0 perf test --record-ctl fifo:"$cf","$af" \
-w context_switch_loop > /dev/null 2>&1
# Test both instruction and branch sample generation modes.
perf script -i "$tmpdir/data" --itrace=i4 -F comm,pid,tid,ip,sym > "$tmpdir/script" 2>/dev/null
check_samples
perf script -i "$tmpdir/data" --itrace=b -F comm,pid,tid,ip,sym > "$tmpdir/script" 2>/dev/null
check_samples
cleanup
exit 0
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