forked from Minki/linux
cd6382d827
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 It's supposed to work with both unwinders: | $ make # for libunwind (default) | $ make NO_LIBUNWIND=1 # for libdw Tester notes: Ran it on N1SDP and it passes, and it fails ifb9f6fbb3b2("perf arm64: Inject missing frames when using 'perf record --call-graph=fp'") isn't applied. Fixes:b9f6fbb3b2("perf arm64: Inject missing frames when using 'perf record --call-graph=fp'") Suggested-by: Jiri Olsa <jolsa@kernel.org> Reviewed-by: James Clark <james.clark@arm.com> Tested-by: James Clark <james.clark@arm.com> Signed-off-by: German Gomez <german.gomez@arm.com> Cc: Alexandre Truong <alexandre.truong@arm.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20220316172015.98000-1-german.gomez@arm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
69 lines
1.4 KiB
Bash
Executable File
69 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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# Check Arm64 callgraphs are complete in fp mode
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# SPDX-License-Identifier: GPL-2.0
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lscpu | grep -q "aarch64" || exit 2
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if ! [ -x "$(command -v cc)" ]; then
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echo "failed: no compiler, install gcc"
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exit 2
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fi
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PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
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TEST_PROGRAM_SOURCE=$(mktemp /tmp/test_program.XXXXX.c)
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TEST_PROGRAM=$(mktemp /tmp/test_program.XXXXX)
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cleanup_files()
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{
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rm -f $PERF_DATA
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rm -f $TEST_PROGRAM_SOURCE
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rm -f $TEST_PROGRAM
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}
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trap cleanup_files exit term int
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cat << EOF > $TEST_PROGRAM_SOURCE
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int a = 0;
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void leaf(void) {
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for (;;)
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a += a;
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}
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void parent(void) {
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leaf();
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}
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int main(void) {
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parent();
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return 0;
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}
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EOF
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echo " + Compiling test program ($TEST_PROGRAM)..."
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CFLAGS="-g -O0 -fno-inline -fno-omit-frame-pointer"
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cc $CFLAGS $TEST_PROGRAM_SOURCE -o $TEST_PROGRAM || exit 1
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# Add a 1 second delay to skip samples that are not in the leaf() function
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perf record -o $PERF_DATA --call-graph fp -e cycles//u -D 1000 -- $TEST_PROGRAM 2> /dev/null &
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PID=$!
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echo " + Recording (PID=$PID)..."
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sleep 2
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echo " + Stopping perf-record..."
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kill $PID
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wait $PID
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# expected perf-script output:
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#
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# program
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# 728 leaf
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# 753 parent
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# 76c main
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# ...
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perf script -i $PERF_DATA -F comm,ip,sym | head -n4
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perf script -i $PERF_DATA -F comm,ip,sym | head -n4 | \
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awk '{ if ($2 != "") sym[i++] = $2 } END { if (sym[0] != "leaf" ||
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sym[1] != "parent" ||
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sym[2] != "main") exit 1 }'
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