perf test: test_intel_pt.sh: Tidy some perf record options

When not decoding, the options "-B -N --no-bpf-event" speed up perf record.
Make a common function for them.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20221014170905.64069-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/tests/shell/test_intel_pt.sh b/tools/perf/tests/shell/test_intel_pt.sh
index 4609a24..334836f 100755 (executable)
--- a/tools/perf/tests/shell/test_intel_pt.sh
+++ b/tools/perf/tests/shell/test_intel_pt.sh
@@ -42,6 +42,14 @@ trap_cleanup()
 
 trap trap_cleanup EXIT TERM INT
 
+# perf record for testing without decoding
+perf_record_no_decode()
+{
+       # Options to speed up recording: no post-processing, no build-id cache update,
+       # and no BPF events.
+       perf record -B -N --no-bpf-event "$@"
+}
+
 have_workload=false
 cat << _end_of_file_ | /usr/bin/cc -o "${workload}" -xc - -pthread && have_workload=true
 #include <time.h>
@@ -76,7 +84,7 @@ _end_of_file_
 can_cpu_wide()
 {
        echo "Checking for CPU-wide recording on CPU $1"
-       if ! perf record -o "${tmpfile}" -B -N --no-bpf-event -e dummy:u -C "$1" true >/dev/null 2>&1 ; then
+       if ! perf_record_no_decode -o "${tmpfile}" -e dummy:u -C "$1" true >/dev/null 2>&1 ; then
                echo "No so skipping"
                return 2
        fi
@@ -93,7 +101,7 @@ test_system_wide_side_band()
        can_cpu_wide 1 || return $?
 
        # Record on CPU 0 a task running on CPU 1
-       perf record -B -N --no-bpf-event -o "${perfdatafile}" -e intel_pt//u -C 0 -- taskset --cpu-list 1 uname
+       perf_record_no_decode -o "${perfdatafile}" -e intel_pt//u -C 0 -- taskset --cpu-list 1 uname
 
        # Should get MMAP events from CPU 1 because they can be needed to decode
        mmap_cnt=$(perf script -i "${perfdatafile}" --no-itrace --show-mmap-events -C 1 2>/dev/null | grep -c MMAP)
@@ -109,7 +117,7 @@ test_system_wide_side_band()
 
 can_kernel()
 {
-       perf record -o "${tmpfile}" -B -N --no-bpf-event -e dummy:k true >/dev/null 2>&1 || return 2
+       perf_record_no_decode -o "${tmpfile}" -e dummy:k true >/dev/null 2>&1 || return 2
        return 0
 }
 
@@ -235,7 +243,7 @@ test_per_thread()
        wait_for_threads ${w1} 2
        wait_for_threads ${w2} 2
 
-       perf record -B -N --no-bpf-event -o "${perfdatafile}" -e intel_pt//u"${k}" -vvv --per-thread -p "${w1},${w2}" 2>"${errfile}" >"${outfile}" &
+       perf_record_no_decode -o "${perfdatafile}" -e intel_pt//u"${k}" -vvv --per-thread -p "${w1},${w2}" 2>"${errfile}" >"${outfile}" &
        ppid=$!
        echo "perf PID is $ppid"
        wait_for_perf_to_start ${ppid} "${errfile}" || return 1