Messages in this thread | | | Subject | Re: [PATCH v2 1/1] perf test arm64: Test unwinding using fame-pointer (fp) mode | From | German Gomez <> | Date | Wed, 16 Mar 2022 17:48:50 +0000 |
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On 16/03/2022 17:30, James Clark wrote: > > On 16/03/2022 17:20, German Gomez wrote: >> Add a shell script to check that the call-graphs generated using frame >> pointers (--call-graph fp) are complete and not missing leaf functions: >> >> | $ perf test 88 -v >> | 88: Check Arm64 callgraphs are complete in fp mode : >> | --- start --- >> | test child forked, pid 8734 >> | + Compiling test program (/tmp/test_program.Cz3yL)... >> | + Recording (PID=8749)... >> | + Stopping perf-record... >> | test_program.Cz >> | 728 leaf >> | 753 parent >> | 76c main >> | test child finished with 0 >> | ---- end ---- >> | Check Arm SPE callgraphs are complete in fp mode: Ok >> > Ran it on N1SDP and it passes, and it fails if b9f6fbb3b2c2 isn't applied.
I forgot to mention in the notes that it's supposed to work with both unwinders:
$ make # for libunwind (default) $ make NO_LIBUNWIND=1 # for libdw
> > Reviewed-by: James Clark <james.clark@arm.com> > >> Fixes: b9f6fbb3b2c2 ("perf arm64: Inject missing frames when using 'perf record --call-graph=fp'") >> Suggested-by: Jiri Olsa <jolsa@kernel.org> >> Signed-off-by: German Gomez <german.gomez@arm.com> >> --- >> Changes since v1: https://lore.kernel.org/all/a6ba0ea8-f070-9f79-f018-f638ff677c7c@arm.com/ >> - Add explicit '-g' flag to GCC command >> --- >> .../perf/tests/shell/test_arm_callgraph_fp.sh | 68 +++++++++++++++++++ >> 1 file changed, 68 insertions(+) >> create mode 100755 tools/perf/tests/shell/test_arm_callgraph_fp.sh >> >> diff --git a/tools/perf/tests/shell/test_arm_callgraph_fp.sh b/tools/perf/tests/shell/test_arm_callgraph_fp.sh >> new file mode 100755 >> index 000000000..ea1b4e6bb >> --- /dev/null >> +++ b/tools/perf/tests/shell/test_arm_callgraph_fp.sh >> @@ -0,0 +1,68 @@ >> +#!/bin/sh >> +# Check Arm64 callgraphs are complete in fp mode >> +# SPDX-License-Identifier: GPL-2.0 >> + >> +lscpu | grep -q "aarch64" || exit 2 >> + >> +if ! [ -x "$(command -v cc)" ]; then >> + echo "failed: no compiler, install gcc" >> + exit 2 >> +fi >> + >> +PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX) >> +TEST_PROGRAM_SOURCE=$(mktemp /tmp/test_program.XXXXX.c) >> +TEST_PROGRAM=$(mktemp /tmp/test_program.XXXXX) >> + >> +cleanup_files() >> +{ >> + rm -f $PERF_DATA >> + rm -f $TEST_PROGRAM_SOURCE >> + rm -f $TEST_PROGRAM >> +} >> + >> +trap cleanup_files exit term int >> + >> +cat << EOF > $TEST_PROGRAM_SOURCE >> +int a = 0; >> +void leaf(void) { >> + for (;;) >> + a += a; >> +} >> +void parent(void) { >> + leaf(); >> +} >> +int main(void) { >> + parent(); >> + return 0; >> +} >> +EOF >> + >> +echo " + Compiling test program ($TEST_PROGRAM)..." >> + >> +CFLAGS="-g -O0 -fno-inline -fno-omit-frame-pointer" >> +cc $CFLAGS $TEST_PROGRAM_SOURCE -o $TEST_PROGRAM || exit 1 >> + >> +# Add a 1 second delay to skip samples that are not in the leaf() function >> +perf record -o $PERF_DATA --call-graph fp -e cycles//u -D 1000 -- $TEST_PROGRAM 2> /dev/null & >> +PID=$! >> + >> +echo " + Recording (PID=$PID)..." >> +sleep 2 >> +echo " + Stopping perf-record..." >> + >> +kill $PID >> +wait $PID >> + >> +# expected perf-script output: >> +# >> +# program >> +# 728 leaf >> +# 753 parent >> +# 76c main >> +# ... >> + >> +perf script -i $PERF_DATA -F comm,ip,sym | head -n4 >> +perf script -i $PERF_DATA -F comm,ip,sym | head -n4 | \ >> + awk '{ if ($2 != "") sym[i++] = $2 } END { if (sym[0] != "leaf" || >> + sym[1] != "parent" || >> + sym[2] != "main") exit 1 }'
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