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#!/bin/bash
# BPF metadata collection test
#
# SPDX-License-Identifier: GPL-2.0
set -e
err=0
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
cleanup() {
rm -f "${perfdata}"
rm -f "${perfdata}".old
trap - EXIT TERM INT
}
trap_cleanup() {
cleanup
exit 1
}
trap trap_cleanup EXIT TERM INT
test_bpf_metadata() {
echo "Checking BPF metadata collection"
if ! perf check -q feature libbpf-strings ; then
echo "Basic BPF metadata test [skipping - not supported]"
err=0
return
fi
# This is a basic invocation of perf record
# that invokes the perf_sample_filter BPF program.
if ! perf record -e task-clock --filter 'ip > 0' \
-o "${perfdata}" sleep 1 2> /dev/null
then
echo "Basic BPF metadata test [Failed record]"
err=1
return
fi
# The BPF programs that ship with "perf" all have the following
# variable defined at compile time:
#
# const char bpf_metadata_perf_version[] SEC(".rodata") = <...>;
#
# This invocation looks for a PERF_RECORD_BPF_METADATA event,
# and checks that its content contains the string given by
# "perf version".
VERS=$(perf version | awk '{print $NF}')
if ! perf script --show-bpf-events -i "${perfdata}" | awk '
/PERF_RECORD_BPF_METADATA.*perf_sample_filter/ {
header = 1;
}
/^ *entry/ {
if (header) { header = 0; entry = 1; }
}
$0 !~ /^ *entry/ {
entry = 0;
}
/perf_version/ {
if (entry) print $NF;
}
' | egrep "$VERS" > /dev/null
then
echo "Basic BPF metadata test [Failed invalid output]"
err=1
return
fi
echo "Basic BPF metadata test [Success]"
}
test_bpf_metadata
cleanup
exit $err
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