name : record_sideband.sh #!/bin/sh # perf record sideband tests # SPDX-License-Identifier: GPL-2.0 set -e err=0 perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX) cleanup() { rm -rf ${perfdata} trap - EXIT TERM INT } trap_cleanup() { cleanup exit 1 } trap trap_cleanup EXIT TERM INT can_cpu_wide() { if ! perf record -o ${perfdata} -BN --no-bpf-event -C $1 true > /dev/null 2>&1 then echo "record sideband test [Skipped cannot record cpu$1]" err=2 fi rm -f ${perfdata} return $err } test_system_wide_tracking() { # Need CPU 0 and CPU 1 can_cpu_wide 0 || return 0 can_cpu_wide 1 || return 0 # Record on CPU 0 a task running on CPU 1 perf record -BN --no-bpf-event -o ${perfdata} -C 0 -- taskset --cpu-list 1 true # Should get MMAP events from CPU 1 mmap_cnt=`perf script -i ${perfdata} --show-mmap-events -C 1 2>/dev/null | grep MMAP | wc -l` if [ ${mmap_cnt} -gt 0 ] ; then return 0 fi echo "Failed to record MMAP events on CPU 1 when tracing CPU 0" return 1 } test_system_wide_tracking cleanup exit $err