664 lines
16 KiB
Bash
Executable File
664 lines
16 KiB
Bash
Executable File
#!/bin/sh
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# Miscellaneous Intel PT testing
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# SPDX-License-Identifier: GPL-2.0
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set -e
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# Skip if no Intel PT
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perf list | grep -q 'intel_pt//' || exit 2
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shelldir=$(dirname "$0")
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. "${shelldir}"/lib/waiting.sh
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skip_cnt=0
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ok_cnt=0
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err_cnt=0
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temp_dir=$(mktemp -d /tmp/perf-test-intel-pt-sh.XXXXXXXXXX)
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tmpfile="${temp_dir}/tmp-perf.data"
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perfdatafile="${temp_dir}/test-perf.data"
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outfile="${temp_dir}/test-out.txt"
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errfile="${temp_dir}/test-err.txt"
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workload="${temp_dir}/workload"
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awkscript="${temp_dir}/awkscript"
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jitdump_workload="${temp_dir}/jitdump_workload"
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maxbrstack="${temp_dir}/maxbrstack.py"
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cleanup()
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{
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trap - EXIT TERM INT
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sane=$(echo "${temp_dir}" | cut -b 1-26)
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if [ "${sane}" = "/tmp/perf-test-intel-pt-sh" ] ; then
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echo "--- Cleaning up ---"
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rm -f "${temp_dir}/"*
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rmdir "${temp_dir}"
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fi
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}
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trap_cleanup()
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{
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cleanup
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exit 1
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}
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trap trap_cleanup EXIT TERM INT
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# perf record for testing without decoding
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perf_record_no_decode()
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{
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# Options to speed up recording: no post-processing, no build-id cache update,
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# and no BPF events.
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perf record -B -N --no-bpf-event "$@"
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}
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# perf record for testing should not need BPF events
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perf_record_no_bpf()
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{
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# Options for no BPF events
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perf record --no-bpf-event "$@"
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}
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have_workload=false
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cat << _end_of_file_ | /usr/bin/cc -o "${workload}" -xc - -pthread && have_workload=true
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#include <time.h>
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#include <pthread.h>
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void work(void) {
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struct timespec tm = {
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.tv_nsec = 1000000,
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};
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int i;
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/* Run for about 30 seconds */
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for (i = 0; i < 30000; i++)
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nanosleep(&tm, NULL);
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}
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void *threadfunc(void *arg) {
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work();
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return NULL;
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}
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int main(void) {
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pthread_t th;
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pthread_create(&th, NULL, threadfunc, NULL);
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work();
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pthread_join(th, NULL);
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return 0;
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}
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_end_of_file_
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can_cpu_wide()
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{
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echo "Checking for CPU-wide recording on CPU $1"
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if ! perf_record_no_decode -o "${tmpfile}" -e dummy:u -C "$1" true >/dev/null 2>&1 ; then
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echo "No so skipping"
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return 2
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fi
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echo OK
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return 0
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}
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test_system_wide_side_band()
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{
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echo "--- Test system-wide sideband ---"
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# Need CPU 0 and CPU 1
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can_cpu_wide 0 || return $?
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can_cpu_wide 1 || return $?
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# Record on CPU 0 a task running on CPU 1
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perf_record_no_decode -o "${perfdatafile}" -e intel_pt//u -C 0 -- taskset --cpu-list 1 uname
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# Should get MMAP events from CPU 1 because they can be needed to decode
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mmap_cnt=$(perf script -i "${perfdatafile}" --no-itrace --show-mmap-events -C 1 2>/dev/null | grep -c MMAP)
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if [ "${mmap_cnt}" -gt 0 ] ; then
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echo OK
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return 0
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fi
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echo "Failed to record MMAP events on CPU 1 when tracing CPU 0"
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return 1
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}
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can_kernel()
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{
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if [ -z "${can_kernel_trace}" ] ; then
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can_kernel_trace=0
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perf_record_no_decode -o "${tmpfile}" -e dummy:k true >/dev/null 2>&1 && can_kernel_trace=1
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fi
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if [ ${can_kernel_trace} -eq 0 ] ; then
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echo "SKIP: no kernel tracing"
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return 2
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fi
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return 0
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}
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test_per_thread()
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{
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k="$1"
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desc="$2"
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echo "--- Test per-thread ${desc}recording ---"
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if ! $have_workload ; then
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echo "No workload, so skipping"
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return 2
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fi
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if [ "${k}" = "k" ] ; then
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can_kernel || return 2
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fi
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cat <<- "_end_of_file_" > "${awkscript}"
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BEGIN {
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s = "[ ]*"
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u = s"[0-9]+"s
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d = s"[0-9-]+"s
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x = s"[0-9a-fA-FxX]+"s
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mmapping = "idx"u": mmapping fd"u
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set_output = "idx"u": set output fd"u"->"u
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perf_event_open = "sys_perf_event_open: pid"d"cpu"d"group_fd"d"flags"x"="u
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}
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/perf record opening and mmapping events/ {
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if (!done)
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active = 1
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}
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/perf record done opening and mmapping events/ {
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active = 0
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done = 1
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}
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$0 ~ perf_event_open && active {
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match($0, perf_event_open)
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$0 = substr($0, RSTART, RLENGTH)
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pid = $3
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cpu = $5
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fd = $11
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print "pid " pid " cpu " cpu " fd " fd " : " $0
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fd_array[fd] = fd
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pid_array[fd] = pid
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cpu_array[fd] = cpu
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}
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$0 ~ mmapping && active {
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match($0, mmapping)
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$0 = substr($0, RSTART, RLENGTH)
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fd = $5
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print "fd " fd " : " $0
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if (fd in fd_array) {
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mmap_array[fd] = 1
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} else {
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print "Unknown fd " fd
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exit 1
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}
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}
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$0 ~ set_output && active {
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match($0, set_output)
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$0 = substr($0, RSTART, RLENGTH)
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fd = $6
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fd_to = $8
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print "fd " fd " fd_to " fd_to " : " $0
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if (fd in fd_array) {
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if (fd_to in fd_array) {
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set_output_array[fd] = fd_to
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} else {
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print "Unknown fd " fd_to
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exit 1
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}
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} else {
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print "Unknown fd " fd
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exit 1
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}
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}
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END {
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print "Checking " length(fd_array) " fds"
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for (fd in fd_array) {
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if (fd in mmap_array) {
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pid = pid_array[fd]
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if (pid != -1) {
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if (pid in pids) {
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print "More than 1 mmap for PID " pid
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exit 1
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}
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pids[pid] = 1
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}
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cpu = cpu_array[fd]
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if (cpu != -1) {
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if (cpu in cpus) {
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print "More than 1 mmap for CPU " cpu
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exit 1
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}
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cpus[cpu] = 1
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}
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} else if (!(fd in set_output_array)) {
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print "No mmap for fd " fd
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exit 1
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}
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}
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n = length(pids)
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if (n != thread_cnt) {
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print "Expected " thread_cnt " per-thread mmaps - found " n
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exit 1
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}
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}
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_end_of_file_
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$workload &
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w1=$!
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$workload &
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w2=$!
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echo "Workload PIDs are $w1 and $w2"
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wait_for_threads ${w1} 2
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wait_for_threads ${w2} 2
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perf_record_no_decode -o "${perfdatafile}" -e intel_pt//u"${k}" -vvv --per-thread -p "${w1},${w2}" 2>"${errfile}" >"${outfile}" &
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ppid=$!
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echo "perf PID is $ppid"
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wait_for_perf_to_start ${ppid} "${errfile}" || return 1
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kill ${w1}
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wait_for_process_to_exit ${w1} || return 1
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is_running ${ppid} || return 1
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kill ${w2}
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wait_for_process_to_exit ${w2} || return 1
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wait_for_process_to_exit ${ppid} || return 1
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awk -v thread_cnt=4 -f "${awkscript}" "${errfile}" || return 1
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echo OK
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return 0
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}
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test_jitdump()
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{
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echo "--- Test tracing self-modifying code that uses jitdump ---"
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script_path=$(realpath "$0")
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script_dir=$(dirname "$script_path")
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jitdump_incl_dir="${script_dir}/../../util"
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jitdump_h="${jitdump_incl_dir}/jitdump.h"
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if [ ! -e "${jitdump_h}" ] ; then
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echo "SKIP: Include file jitdump.h not found"
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return 2
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fi
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if [ -z "${have_jitdump_workload}" ] ; then
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have_jitdump_workload=false
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# Create a workload that uses self-modifying code and generates its own jitdump file
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cat <<- "_end_of_file_" | /usr/bin/cc -o "${jitdump_workload}" -I "${jitdump_incl_dir}" -xc - -pthread && have_jitdump_workload=true
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#define _GNU_SOURCE
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include "jitdump.h"
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#define CHK_BYTE 0x5a
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static inline uint64_t rdtsc(void)
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{
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unsigned int low, high;
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asm volatile("rdtsc" : "=a" (low), "=d" (high));
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return low | ((uint64_t)high) << 32;
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}
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static FILE *open_jitdump(void)
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{
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struct jitheader header = {
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.magic = JITHEADER_MAGIC,
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.version = JITHEADER_VERSION,
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.total_size = sizeof(header),
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.pid = getpid(),
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.timestamp = rdtsc(),
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.flags = JITDUMP_FLAGS_ARCH_TIMESTAMP,
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};
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char filename[256];
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FILE *f;
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void *m;
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snprintf(filename, sizeof(filename), "jit-%d.dump", getpid());
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f = fopen(filename, "w+");
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if (!f)
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goto err;
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/* Create an MMAP event for the jitdump file. That is how perf tool finds it. */
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m = mmap(0, 4096, PROT_READ | PROT_EXEC, MAP_PRIVATE, fileno(f), 0);
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if (m == MAP_FAILED)
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goto err_close;
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munmap(m, 4096);
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if (fwrite(&header,sizeof(header),1,f) != 1)
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goto err_close;
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return f;
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err_close:
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fclose(f);
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err:
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return NULL;
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}
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static int write_jitdump(FILE *f, void *addr, const uint8_t *dat, size_t sz, uint64_t *idx)
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{
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struct jr_code_load rec = {
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.p.id = JIT_CODE_LOAD,
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.p.total_size = sizeof(rec) + sz,
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.p.timestamp = rdtsc(),
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.pid = getpid(),
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.tid = gettid(),
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.vma = (unsigned long)addr,
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.code_addr = (unsigned long)addr,
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.code_size = sz,
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.code_index = ++*idx,
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};
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if (fwrite(&rec,sizeof(rec),1,f) != 1 ||
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fwrite(dat, sz, 1, f) != 1)
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return -1;
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return 0;
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}
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static void close_jitdump(FILE *f)
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{
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fclose(f);
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}
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int main()
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{
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/* Get a memory page to store executable code */
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void *addr = mmap(0, 4096, PROT_WRITE | PROT_EXEC, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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/* Code to execute: mov CHK_BYTE, %eax ; ret */
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uint8_t dat[] = {0xb8, CHK_BYTE, 0x00, 0x00, 0x00, 0xc3};
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FILE *f = open_jitdump();
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uint64_t idx = 0;
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int ret = 1;
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if (!f)
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return 1;
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/* Copy executable code to executable memory page */
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memcpy(addr, dat, sizeof(dat));
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/* Record it in the jitdump file */
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if (write_jitdump(f, addr, dat, sizeof(dat), &idx))
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goto out_close;
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/* Call it */
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ret = ((int (*)(void))addr)() - CHK_BYTE;
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out_close:
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close_jitdump(f);
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return ret;
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}
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_end_of_file_
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fi
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if ! $have_jitdump_workload ; then
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echo "SKIP: No jitdump workload"
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return 2
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fi
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# Change to temp_dir so jitdump collateral files go there
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cd "${temp_dir}"
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perf_record_no_bpf -o "${tmpfile}" -e intel_pt//u "${jitdump_workload}"
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perf inject -i "${tmpfile}" -o "${perfdatafile}" --jit
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decode_br_cnt=$(perf script -i "${perfdatafile}" --itrace=b | wc -l)
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# Note that overflow and lost errors are suppressed for the error count
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decode_err_cnt=$(perf script -i "${perfdatafile}" --itrace=e-o-l | grep -ci error)
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cd -
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# Should be thousands of branches
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if [ "${decode_br_cnt}" -lt 1000 ] ; then
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echo "Decode failed, only ${decode_br_cnt} branches"
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return 1
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fi
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# Should be no errors
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if [ "${decode_err_cnt}" -ne 0 ] ; then
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echo "Decode failed, ${decode_err_cnt} errors"
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perf script -i "${perfdatafile}" --itrace=e-o-l --show-mmap-events | cat
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return 1
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fi
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echo OK
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return 0
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}
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test_packet_filter()
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{
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echo "--- Test with MTC and TSC disabled ---"
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# Disable MTC and TSC
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perf_record_no_decode -o "${perfdatafile}" -e intel_pt/mtc=0,tsc=0/u uname
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# Should not get MTC packet
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mtc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "MTC 0x")
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if [ "${mtc_cnt}" -ne 0 ] ; then
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echo "Failed to filter with mtc=0"
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return 1
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fi
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# Should not get TSC package
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tsc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TSC 0x")
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if [ "${tsc_cnt}" -ne 0 ] ; then
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echo "Failed to filter with tsc=0"
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return 1
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fi
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echo OK
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return 0
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}
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test_disable_branch()
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{
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echo "--- Test with branches disabled ---"
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# Disable branch
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perf_record_no_decode -o "${perfdatafile}" -e intel_pt/branch=0/u uname
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# Should not get branch related packets
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tnt_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TNT 0x")
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tip_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "TIP 0x")
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fup_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "FUP 0x")
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if [ "${tnt_cnt}" -ne 0 ] || [ "${tip_cnt}" -ne 0 ] || [ "${fup_cnt}" -ne 0 ] ; then
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echo "Failed to disable branches"
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return 1
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fi
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echo OK
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return 0
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}
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|
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test_time_cyc()
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{
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echo "--- Test with/without CYC ---"
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# Check if CYC is supported
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cyc=$(cat /sys/bus/event_source/devices/intel_pt/caps/psb_cyc)
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if [ "${cyc}" != "1" ] ; then
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echo "SKIP: CYC is not supported"
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return 2
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fi
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# Enable CYC
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perf_record_no_decode -o "${perfdatafile}" -e intel_pt/cyc/u uname
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# should get CYC packets
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cyc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "CYC 0x")
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if [ "${cyc_cnt}" = "0" ] ; then
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echo "Failed to get CYC packet"
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return 1
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fi
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# Without CYC
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perf_record_no_decode -o "${perfdatafile}" -e intel_pt//u uname
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# Should not get CYC packets
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cyc_cnt=$(perf script -i "${perfdatafile}" -D 2>/dev/null | grep -c "CYC 0x")
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if [ "${cyc_cnt}" -gt 0 ] ; then
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echo "Still get CYC packet without cyc"
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return 1
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fi
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echo OK
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return 0
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}
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|
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test_sample()
|
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{
|
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echo "--- Test recording with sample mode ---"
|
|
# Check if recording with sample mode is working
|
|
if ! perf_record_no_decode -o "${perfdatafile}" --aux-sample=8192 -e '{intel_pt//u,branch-misses:u}' uname ; then
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echo "perf record failed with --aux-sample"
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return 1
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fi
|
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echo OK
|
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return 0
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}
|
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|
|
test_kernel_trace()
|
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{
|
|
echo "--- Test with kernel trace ---"
|
|
# Check if recording with kernel trace is working
|
|
can_kernel || return 2
|
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if ! perf_record_no_decode -o "${perfdatafile}" -e intel_pt//k -m1,128 uname ; then
|
|
echo "perf record failed with intel_pt//k"
|
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return 1
|
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fi
|
|
echo OK
|
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return 0
|
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}
|
|
|
|
test_virtual_lbr()
|
|
{
|
|
echo "--- Test virtual LBR ---"
|
|
# Check if python script is supported
|
|
libpython=$(perf version --build-options | grep python | grep -cv OFF)
|
|
if [ "${libpython}" != "1" ] ; then
|
|
echo "SKIP: python scripting is not supported"
|
|
return 2
|
|
fi
|
|
|
|
# Python script to determine the maximum size of branch stacks
|
|
cat << "_end_of_file_" > "${maxbrstack}"
|
|
from __future__ import print_function
|
|
|
|
bmax = 0
|
|
|
|
def process_event(param_dict):
|
|
if "brstack" in param_dict:
|
|
brstack = param_dict["brstack"]
|
|
n = len(brstack)
|
|
global bmax
|
|
if n > bmax:
|
|
bmax = n
|
|
|
|
def trace_end():
|
|
print("max brstack", bmax)
|
|
_end_of_file_
|
|
|
|
# Check if virtual lbr is working
|
|
perf_record_no_bpf -o "${perfdatafile}" --aux-sample -e '{intel_pt//,cycles}:u' uname
|
|
times_val=$(perf script -i "${perfdatafile}" --itrace=L -s "${maxbrstack}" 2>/dev/null | grep "max brstack " | cut -d " " -f 3)
|
|
case "${times_val}" in
|
|
[0-9]*) ;;
|
|
*) times_val=0;;
|
|
esac
|
|
if [ "${times_val}" -lt 2 ] ; then
|
|
echo "Failed with virtual lbr"
|
|
return 1
|
|
fi
|
|
echo OK
|
|
return 0
|
|
}
|
|
|
|
test_power_event()
|
|
{
|
|
echo "--- Test power events ---"
|
|
# Check if power events are supported
|
|
power_event=$(cat /sys/bus/event_source/devices/intel_pt/caps/power_event_trace)
|
|
if [ "${power_event}" != "1" ] ; then
|
|
echo "SKIP: power_event_trace is not supported"
|
|
return 2
|
|
fi
|
|
if ! perf_record_no_decode -o "${perfdatafile}" -a -e intel_pt/pwr_evt/u uname ; then
|
|
echo "perf record failed with pwr_evt"
|
|
return 1
|
|
fi
|
|
echo OK
|
|
return 0
|
|
}
|
|
|
|
test_no_tnt()
|
|
{
|
|
echo "--- Test with TNT packets disabled ---"
|
|
# Check if TNT disable is supported
|
|
notnt=$(cat /sys/bus/event_source/devices/intel_pt/caps/tnt_disable)
|
|
if [ "${notnt}" != "1" ] ; then
|
|
echo "SKIP: tnt_disable is not supported"
|
|
return 2
|
|
fi
|
|
perf_record_no_decode -o "${perfdatafile}" -e intel_pt/notnt/u uname
|
|
# Should be no TNT packets
|
|
tnt_cnt=$(perf script -i "${perfdatafile}" -D | grep -c TNT)
|
|
if [ "${tnt_cnt}" -ne 0 ] ; then
|
|
echo "TNT packets still there after notnt"
|
|
return 1
|
|
fi
|
|
echo OK
|
|
return 0
|
|
}
|
|
|
|
test_event_trace()
|
|
{
|
|
echo "--- Test with event_trace ---"
|
|
# Check if event_trace is supported
|
|
event_trace=$(cat /sys/bus/event_source/devices/intel_pt/caps/event_trace)
|
|
if [ "${event_trace}" != 1 ] ; then
|
|
echo "SKIP: event_trace is not supported"
|
|
return 2
|
|
fi
|
|
if ! perf_record_no_decode -o "${perfdatafile}" -e intel_pt/event/u uname ; then
|
|
echo "perf record failed with event trace"
|
|
return 1
|
|
fi
|
|
echo OK
|
|
return 0
|
|
}
|
|
|
|
count_result()
|
|
{
|
|
if [ "$1" -eq 2 ] ; then
|
|
skip_cnt=$((skip_cnt + 1))
|
|
return
|
|
fi
|
|
if [ "$1" -eq 0 ] ; then
|
|
ok_cnt=$((ok_cnt + 1))
|
|
return
|
|
fi
|
|
err_cnt=$((err_cnt + 1))
|
|
}
|
|
|
|
ret=0
|
|
test_system_wide_side_band || ret=$? ; count_result $ret ; ret=0
|
|
test_per_thread "" "" || ret=$? ; count_result $ret ; ret=0
|
|
test_per_thread "k" "(incl. kernel) " || ret=$? ; count_result $ret ; ret=0
|
|
test_jitdump || ret=$? ; count_result $ret ; ret=0
|
|
test_packet_filter || ret=$? ; count_result $ret ; ret=0
|
|
test_disable_branch || ret=$? ; count_result $ret ; ret=0
|
|
test_time_cyc || ret=$? ; count_result $ret ; ret=0
|
|
test_sample || ret=$? ; count_result $ret ; ret=0
|
|
test_kernel_trace || ret=$? ; count_result $ret ; ret=0
|
|
test_virtual_lbr || ret=$? ; count_result $ret ; ret=0
|
|
test_power_event || ret=$? ; count_result $ret ; ret=0
|
|
test_no_tnt || ret=$? ; count_result $ret ; ret=0
|
|
test_event_trace || ret=$? ; count_result $ret ; ret=0
|
|
|
|
cleanup
|
|
|
|
echo "--- Done ---"
|
|
|
|
if [ ${err_cnt} -gt 0 ] ; then
|
|
exit 1
|
|
fi
|
|
|
|
if [ ${ok_cnt} -gt 0 ] ; then
|
|
exit 0
|
|
fi
|
|
|
|
exit 2
|