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    SubjectRe: [PATCH V2 01/23] perf intel-pt: Add a test for system-wide side band
    Em Fri, May 06, 2022 at 03:25:39PM +0300, Adrian Hunter escreveu:
    > Add a test for system-wide side band even when tracing selected CPUs.
    >
    > Tested-by: Ian Rogers <irogers@google.com>
    > Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>


    [root@quaco ~]# uname -a
    Linux quaco 5.16.13-200.fc35.x86_64 #1 SMP PREEMPT Tue Mar 8 22:50:58 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
    [root@quaco ~]# grep -m1 -i "model name" /proc/cpuinfo
    model name : Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz
    [root@quaco ~]# perf test -v Misc
    97: Miscellaneous Intel PT testing :
    --- start ---
    test child forked, pid 769475
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 1.352 MB /tmp/tmp.Ty4Rqnz4vz ]
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 1.352 MB /tmp/tmp.Ty4Rqnz4vz ]
    Linux
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 1.446 MB /tmp/tmp.TnEqenwzZv ]
    Failed to record MMAP events on CPU 1 when tracing CPU 0
    test child finished with -1
    ---- end ----
    Miscellaneous Intel PT testing: FAILED!
    [root@quaco ~]#

    Do I need some more recent machine or kernel?

    - Arnaldo

    > ---
    > tools/perf/tests/shell/test_intel_pt.sh | 71 +++++++++++++++++++++++++
    > 1 file changed, 71 insertions(+)
    > create mode 100755 tools/perf/tests/shell/test_intel_pt.sh
    >
    > diff --git a/tools/perf/tests/shell/test_intel_pt.sh b/tools/perf/tests/shell/test_intel_pt.sh
    > new file mode 100755
    > index 000000000000..a3298643884d
    > --- /dev/null
    > +++ b/tools/perf/tests/shell/test_intel_pt.sh
    > @@ -0,0 +1,71 @@
    > +#!/bin/sh
    > +# Miscellaneous Intel PT testing
    > +# SPDX-License-Identifier: GPL-2.0
    > +
    > +set -e
    > +
    > +# Skip if no Intel PT
    > +perf list | grep -q 'intel_pt//' || exit 2
    > +
    > +skip_cnt=0
    > +ok_cnt=0
    > +err_cnt=0
    > +
    > +tmpfile=`mktemp`
    > +perfdatafile=`mktemp`
    > +
    > +can_cpu_wide()
    > +{
    > + perf record -o ${tmpfile} -B -N --no-bpf-event -e dummy:u -C $1 true 2>&1 >/dev/null || return 2
    > + return 0
    > +}
    > +
    > +test_system_wide_side_band()
    > +{
    > + # Need CPU 0 and CPU 1
    > + can_cpu_wide 0 || return $?
    > + 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
    > +
    > + # 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 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
    > +}
    > +
    > +count_result()
    > +{
    > + if [ $1 -eq 2 ] ; then
    > + skip_cnt=`expr ${skip_cnt} \+ 1`
    > + return
    > + fi
    > + if [ $1 -eq 0 ] ; then
    > + ok_cnt=`expr ${ok_cnt} \+ 1`
    > + return
    > + fi
    > + err_cnt=`expr ${err_cnt} \+ 1`
    > +}
    > +
    > +test_system_wide_side_band
    > +
    > +count_result $?
    > +
    > +rm -f ${tmpfile}
    > +rm -f ${perfdatafile}
    > +
    > +if [ ${err_cnt} -gt 0 ] ; then
    > + exit 1
    > +fi
    > +
    > +if [ ${ok_cnt} -gt 0 ] ; then
    > + exit 0
    > +fi
    > +
    > +exit 2
    > --
    > 2.25.1
    --

    - Arnaldo

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